Telit EVB2.

0
User Guide

1VV0301774 Rev 4
2023-11-10
Released
Confidential

Technical Documentation
 Telit EVB2.0 User Guide

Contents
1 Applicability Table ............................................................................................................................4
2 Introduction .....................................................................................................................................5
2.1 Scope 5
2.2 Audience 5
2.3 Contact Information, Support 5
2.4 Conventions 5
2.5 Terms and conditions 6
2.6 Disclaimer 6
3 General Product Description ...........................................................................................................7
3.1 Overview 7
3.2 Block Diagram 7
3.3 Telit EVB 2.0 Target 8
3.4 TLB Types 8
3.5 Main Features 9
3.6 Main Electrical Specifications 10
3.7 Mechanical Specifications 10
Dimensions 10
Temperature Range 10
4 120-Pin Male B2B Connectors .......................................................................................................11
4.1 B2B Connectors Layout (Top View) 11
4.2 B2B Connectors Pinout 11
5 Extra Connectors on Bottom Side..................................................................................................15
5.1 Extra Connectors Layout (Bottom View) 15
SO1301 2x20 Female 15
PL1301 2x3 Female 15
6 Power Supply .................................................................................................................................16
6.1 Example Use Cases 16
6.2 Vbatt Voltage Level 17
6.3 Power Supply Configuration 18
No-Leak Jumper 18
Source Selector 18
Voltage Selector 19
Kill Push Button 19
6.4 Power Supply Requirements 19
6.5 4-Wires Connection for Direct Supply 20
Direct Supply 20
6.6 Power Consumption Measurement 20
Measuring the Current by a Current Meter 21
Measuring the Current by a Power Supply 22
Measuring the Current through the Shunt Resistor 23
6.7 VAUX/PWRMON Power Output 24
7 Voltage Domains ............................................................................................................................25
8 Digital Section ................................................................................................................................26
8.1 Power On 26
8.2 Communication Ports 27
USB DEVICE (USB PWR) and USB EVB (FTDI) 27

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UARTs Pins Naming Convention 27

Serial Ports 28
8.3 SIM Card Holders 28
8.4 SDIO Interface 29
8.5 LEDs 29
Current Monitor 29
STAT_ LED 29
PWRMON 30
SW_RDY/SYSTEM_RDY 30
SPARE_LED 30
GPS PPS 30
USB DEVICE ON 31
USB EVB FTDI ON 31
Audio ON 31
8.6 Push Buttons 32
WCI_RX 32
USB_BOOT 32
RESET 32
SHDN 32
ON/OFF 32
KILL 32
9 Audio Section .................................................................................................................................33
9.1 Electrical Characteristics 34
10 Mechanical Design .........................................................................................................................35
10.1 Drawing 35
11 Acronyms and Abbreviations.........................................................................................................36
12 Related Documents ........................................................................................................................37
13 Document History ..........................................................................................................................38

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 Telit EVB2.0 User Guide

1 Applicability Table
Table 1: Applicability Table
Products
All modules available on a legacy TLB
All modules available on a smart TLB

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 Telit EVB2.0 User Guide

2 Introduction
2.1 Scope
This document introduces the Telit EVB 2.0. The features and solutions described in this
document apply to the variants listed in the applicability table.

2.2 Audience
This document is intended for system integrators who are using the Telit module in their
products.

2.3 Contact Information, Support

For technical support and general questions, e-mail:
• TS-EMEA@telit.com
• TS-AMERICAS@telit.com
• TS-APAC@telit.com
• TS-SRD@telit.com
• TS-ONEEDGE@telit.com

Alternatively, use: https://www.telit.com/contact-us/

Product information and technical documents are accessible 24/7 on our website:
https://www.telit.com
2.4 Conventions
Note: Provide advice and suggestions that may be useful when integrating the
module.
Danger: This information MUST be followed, or catastrophic equipment failure or
personal injury may occur.
ESD Risk: Notifies the user to take proper grounding precautions before handling
the product.
Warning: Alerts the user on important steps about the module integration.
All dates are in ISO 8601 format, that is YYYY-MM-DD.

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 Telit EVB2.0 User Guide

2.5 Terms and conditions

Refer to https://www.telit.com/hardware-terms-conditions/.

2.6 Disclaimer
THE MATERIAL IN THIS DOCUMENT IS FOR INFORMATIONAL PURPOSES ONLY. TELIT
CINTERION RESERVES THE RIGHT TO MAKE CHANGES TO THE PRODUCTS DESCRIBED
HEREIN. THE SPECIFICATIONS IN THIS DOCUMENT ARE SUBJECT TO CHANGE AT THE
DISCRETION OF TELIT CINTERION WITHOUT PRIOR NOTICE. THIS DOCUMENT IS
PROVIDED ON “AS IS” BASIS ONLY AND MAY CONTAIN DEFICIENCIES OR INADEQUACIES.
TELIT CINTERION DOES NOT ASSUME ANY LIABILITY FOR INFORMATION PROVIDED IN
THE DOCUMENT OR ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT
DESCRIBED HEREIN.
TELIT CINTERION GRANTS A NON-EXCLUSIVE RIGHT TO USE THE DOCUMENT. THE
RECIPIENT SHALL NOT COPY, MODIFY, DISCLOSE, OR REPRODUCE THE DOCUMENT
EXCEPT AS SPECIFICALLY AUTHORIZED BY TELIT CINTERION.
TELIT CINTERION AND THE TELIT CINTERION LOGO, ARE TRADEMARKS OF TELIT
CINTERION AND ARE REGISTERED IN CERTAIN COUNTRIES. ALL OTHER REGISTERED
TRADEMARKS OR TRADEMARKS MENTIONED IN THIS DOCUMENT ARE THE PROPERTY
OF THEIR RESPECTIVE OWNERS AND ARE EXPRESSLY RESERVED BY TELIT (AND ITS
LICENSORS).

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 Telit EVB2.0 User Guide

3 General Product Description

3.1 Overview
Telit EVB 2.0 system consists of a main board, as well as connectors, cables, accessories,
and software. It is designed to host Telit modules allowing users to easily test the main
module functions and features.

3.2 Block Diagram

The block diagram below depicts the main Telit EVB 2.0 building blocks in their
approximate positions on the board.

Figure 1: Telit EVB 2.0 Block Diagram

The Telit EVB 2.0 hosts a daughter board known as the TLB which serves as a mechanical
adapter from various Telit modules form factors to the three board-to-board
connectors.
This approach strikes a balance between the need for a small-closed-shielded hardware
layout (best practice in electronics) and making it available in an open and user-friendly
package. Thus, the Telit EVB 2.0 and TLBs are intentionally not optimized as a “finished”
product.
Of course, some circuit parts can be used as examples or inspirations, but in some
cases, end-product design solutions should be tailored to specific applications.
The modem communicates with the host PC via two USB-C cables: one for the module
USB communication port and the other for serial lines, through a USB to-serial
converter.
The onboard power supply on the Telit EVB 2.0 is versatile and configurable: ancillary
circuits and the Telit module can be powered independently by USB PWR (DEVICE) and
USB FTDI (EVB) through a regulator, via a 12V Wall Adapter through a regulator and, for

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 Telit EVB2.0 User Guide

specific in-depth tests, providing DC power directly from an external power supply
(caution: the voltage must be regulated and needs to be within the modem voltage
range).
The Telit EVB 2.0 includes two SIM card holders, thus supporting dual-SIM modems. For
modules supporting only one SIM interface, the SIM1 holder is the default SIM socket.
Push buttons and LEDs are used as interfaces for the human operator.
A large number of standard 2.54 mm pin headers, clearly identified by the silkscreen on
the PCB, helps the user in testing connections between ports or from an interface port
to test equipment.
The audio section is minimal and allows testing with a standard hands-free headset, as
well as connection to test equipment or to external amplifiers and transducers provided
by the customer.
Telit modules require either 3.8, 3.3, or 1.8 V: this board is meant to be universal, thus it
supports all three voltage levels; however, the user must carefully set up the board
according to the instructions.
Warning: In case of incorrect power supply voltage configuration, the module
can be irreversibly damaged.

3.3 Telit EVB 2.0 Target

Telit EVB 2.0 design aims at full compatibility with all existing Telit products and is future-
proof.

3.4 TLB Types

TLBs are classified into two types: "old" (referred to as "LEGACY TLBs") and "new"
(referred to as "SMART TLBs"). They differ in whether they were designed before or after
the Telit EVB 2.0 introduction.
Table 2: Product Variants and their Frequency Bands
TLB TAG Description
LGCY38 TLB The TLBs developed before this Telit EVB 2.0, for modules with Vbatt=3.8V.
The voltage selector must be set at 3.8V.
LGCY33 TLB The TLBs developed before this Telit EVB 2.0, for modules with Vbatt=3.3v.
The voltage selector must be set to 3.3V.
SMRT38 TLB TLBs that (despite the voltage selector position) automatically set the MAIN
regulator's voltage to the required 3.8V.
SMRT33 TLB TLBs that (despite the voltage selector position) automatically set the MAIN
regulator's voltage to the required 3.3V.
SMRT18 TLB TLBs that (despite the voltage selector position) automatically set the MAIN
regulator's voltage to the required 1.8V.
Telit EVB 2.0 is backward compatible with legacy TLBs that were developed and released
before its introduction.
Telit EVB 2.0 offers some special features on the smart TLB:
• Power When Needed (PWN): The Main regulator is enabled when the TLB is properly
inserted.

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• Automatic Voltage Selection (AVS) for main supply: the range is approximately 1-4.5V.
• Automatic Voltage Selection (AVS) for VDDIO, typically 1.8 or 2.8V.
• Automatic Voltage Selection (AVS) for VSERV. The range is roughly 0.5-3.3V.
Please refer to the “AVS Section” for detailed information about voltages on the SMART
TLBs.

3.5 Main Features

Table 3: Functional Features
Function Features
Connection with PC The USB of the device is connected to the PC via a USB-C port
or external host (DEVICE PWR)
The UART ports of the device are conveyed as VCP on a USB-C
port (EVB FTDI)
The main UART is converted by an FTDI chip
An AUX UART is converted by an FTDI chip
A UART3 is converted by an FTDI chip
Versatile power DIRECT SUPPLY is for advanced users (typically, hardware
supply designers) who need to provide supply voltage directly to the
module
VIA REGULATOR
12V wall adapter or USB (DEVICE PWR or EVB FDTI) source
selection
Every device gets the proper voltage (1.8V, 3.3V, 3.8V)
The voltage is automatic or even PROGRAMMABLE
Power Supply can be opened for testing
Power Supply is activated automatically or on demand
When VIA DCDC mode is used, an external PC can control the
regulator: it can be switched ON or OFF and the voltage can be set
as desired
2 SIM holder There are 2 SIM holders, for the module supporting 2 SIM
interfaces
SIM1 is the default SIM holder for the module that manages a
single SIM.
SDIO interface The SDIO interface goes to a dedicated connector powered by a
3.3v regulator
Digital audio A codec provided with all ancillary parts produces the digital audio
Analog audio Buffer amplifier, click & pop-less design without tantalum
capacitors and microphone bias circuitry to manage analog audio,
both connected to the jack and test points
Push buttons and All the basic HW activations (On/Off, Reset, …) can be operated
switches manually via push buttons
LED’s LEDs provide an indication of board and module status and so on.
Current Multiple ways are available to measure module current
consumption consumption.
measurements

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Function Features
Easy disconnect of ancillary circuits (needed during normal
operation) to avoid leaking currents that impact current
measurements
GPIO facilitation Module signals are tied to pin headers, to ease test and
debugging.
Some signals are bridged with jumpers to make them available to
high-level interfaces/connectors
All headers can be connected using wired jumpers
Voltage & current A current and voltage monitor connected via I2C can be read by an
monitorable by PC external PC, allowing to monitor the status of the device under test
Control extension The I2C controlling bus and some supply rails are available on a
port connector to manage a daughter board for future use
JTAG header 2 x 10 shrouded JTAG header
3.6 Main Electrical Specifications
Table 4: Electrical Specification at Connections
Connector Specification
Direct Supply Refer to the module specifications
5.5/2.5mm power jack 5V or 12V (36 V tolerant)
SIM holders Refer to the specifications of the module-mounted
USB EVB FTDI USB2 interface
USB DEVICE PWR USB3, VUSB = 5v
Audio Jack Microphone J-fet Electret Microphone: -38-45dBv/Pa
Audio Jack earpieces >=16 Ohm, 32Ohm best
3.7 Mechanical Specifications
Dimensions
The overall dimensions of Telit EVB 2.0 are:
• Size: 156x125 [mm]
• PCB Thickness: 1.6 [mm]

Temperature Range
Table 5: Temperature Range
Mode Temperature Note
Operating Temperature –20°C - SIM CARDs might not withstand extreme
Range +55°C temperatures
–40°C - The board (except SIM cards) is fully functional
+100°C (*) across the whole temperature range.
Storage and non-operating –40°C -
Temperature Range +85°C
Note: (*) Functional: if applicable, the board is capable to supply and enable
serial/USB communications to the TLB and its module.

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4 120-Pin Male B2B Connectors

4.1 B2B Connectors Layout (Top View)
The connection between Telit EVB 2.0 and TLB is implemented via three 120-poles (20
poles x 6 rows) SAMTEC SEARAY 1.27mm High Speed/High-Density B2B connectors
(10mm stack height SEAM/SEAF).
The drawing below shows the B2B connectors layout on the board.

Figure 2: B2B Connectors Layout (top view)

Three tables in the following chapter provide detailed pin mapping.

Please refer to the User Guide of the specific TLB in use for the actual pin mapping and
pin description.
Warning: Reserved pins must not be connected.

4.2 B2B Connectors Pinout

The tables below show the signal present on each B2B connector pin.
Table 6: B2B L Pin-out Information
B2B L (LEFT)
1 2 3 4 5 6
GPS_LNA_BIAS GND GPS_LNA_EN MICBIAS_MODULE GND NC / JACK_DET
7 8 9 10 11 12
GND GND GND GND GND NC
13 14 15 16 17 18
MIC2_MT+ MIC2_MT- GND EAR2_MT- EAR2_MT+ NC
19 20 21 22 23 24
GND GND GND GND GND GND

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B2B L (LEFT)
25 26 27 28 29 30
MIC1_MT+ MIC1_MT- GND EAR1_MT- EAR1_MT+ GND
31 32 33 34 35 36
SPKR_N SPKR_P NC NC RESERVED MIC_VDD
(DON'T USE)
37 38 39 40 41 42
GND GND D_MIC_CLK D_MIC_DATA_1 GND GND
43 44 45 46 47 48
NC GND GND GND GND GND
49 50 51 52 53 54
NC GND GND ADC_IN3 ADC_IN2 ADC_IN1
55 56 57 58 59 60
NC NC NC NC DAC_OUT NC
61 62 63 64 65 66
DVI_RX DVI_TX DVI_CLK DVI_WAO REF_CLK_FF GND
67 68 69 70 71 72
GND GND GND GND GND ESIM_RST
73 74 75 76 77 78
GND GND GND GND SIMVCC1 SIMVCC1
79 80 81 82 83 84
HSIC_STB HSIC_DATA SIMCLK1 SIMIN1 SIMIO1 SIMRST1
85 86 87 88 89 90
HW_KEY VRTC ETH_RST_N ETH_INT_N SIMVCC2 SIMVCC2
91 92 93 94 95 96
USB_VBUS USB_ID SIMIN2 SIMIO2 SIMRST2 SIMCLK2
97 98 99 100 101 102
GND GND MAC_REF_CL MAC_TXEN_ER MAC_MDIO MAC_RXDV_ER
K
103 104 105 106 107 108
USB_D+ GND MAC_TXD_0 MAC_MDC MAC_RXD_0 MAC_CRS_DV
109 110 111 112 113 114
USB_D- GND MAC_TXD_1 MAC_TXD_2 MAC_RXD_1 MAC_RXD_2
115 116 117 118 119 120
GND GND MAC_TX_CLK MAC_TXD_3 MAC_RX_CLK MAC_RXD_3
Table 7: B2B C Pin-out Information
B2B C (CENTRAL)
1 2 3 4 5 6
GND GND I2C_SCL_AUX I2C_SDA_AUX GND SGMII_RX_M
7 8 9 10 11 12
USB_SS_RX_P GND I2C_SDA_B2B TGPIO_06 SGMII_TX_M SGMII_RX_P
13 14 15 16 17 18
USB_SS_RX_M GND TGPIO_05 I2C_SCL_B2B SGMII_TX_P GND
19 20 21 22 23 24

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B2B C (CENTRAL)
GND GND VAUX/PWRMON2 VAUX/PWRMO GND PCIE_RX_P
N2
25 26 27 28 29 30
USB_SS_TX_P GND NC FORDCED_USB PCIE_TX_P PCIE_RX_M
_BOOT
31 32 33 34 35 36
NetSO101_45 GND TGPIO_12 SPI_MOSI PCIE_TX_M GND
37 38 39 40 41 42
GND NC TGPIO_11 TGPIO_04 GND PCIE_REFCLK_P
43 44 45 46 47 48
#SPI_CS TGPIO_02 TGPIO_03 SPI_MISO NC PCIE_REFCLK_M
49 50 51 52 53 54
VAUX/PWRM VAUX/PWR LED_DRV_EN SPI_CLK NC NC
ON1 MON1
55 56 57 58 59 60
TGPIO_08 TGPIO_07 TGPIO_01 TGPIO_09 NC NC
61 62 63 64 65 66
TGPIO_21 TGPIO_10 TGPIO_22 TGPIO_20 NC NC
67 68 69 70 71 72
VMMC VMMC MMC_CD MMC_DAT3 NC NC
73 74 75 76 77 78
MMC_DAT0 MMC_DAT2 MMC_CLK MMC_DAT1 PCIE_EP_RE NC
SET_N
79 80 81 82 83 84
TLB_CONN GND C107/DSR MMC_CMD PCIE_CLKRE NC
Q_N
85 86 87 88 89 90
WIFI_SD0_TGP WIFI_SD1_T WIFI_SDCMD_TGP WIFI_SDRST_TG TXD_AUX RTS_AUX
IO15 GPIO16 IO14 PIO13
91 92 93 94 95 96
WIFI_SD5_TGP WIFI_SD2_T WIFI_SD3_TGPIO1 WIFI_SD4_TGPI RXD_AUX CTS_AUX
IO24 GPIO17 8 O23
97 98 99 100 101 102
WIFI_SD6_TGP WIFI_SD7_T WIFI_SDCLK_TGPI WCI_TX WCI_RX NC
IO25 GPIO26 O19
103 104 105 106 107 108
C125/RING RFCLK2_QC WLAN_SLEEP_CLK C105/RTS PCIE_EP_WA NC
A KE_N
109 110 111 112 113 114
C104/RXD C109/DCD C103/TXD C106/CTS C108/DTR NC
115 116 117 118 119 120
NC NC NC NC NC NC

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Table 8: B2B R Pin-out Information

B2B R (RIGHT)
1 2 3 4 5 6
VBATT VBATT VBATT VBATT_PA VBATT_PA VBATT_PA
7 8 9 10 11 12
VBATT VBATT VBATT VBATT_PA VBATT_PA VBATT_PA
13 14 15 16 17 18
VBATT VBATT VBATT VBATT_PA VBATT_PA VBATT_PA
19 20 21 22 23 24
VBATT_AUX VBATT_AUX VBATT_AUX VBATT_PA VBATT_PA VBATT_PA
25 26 27 28 29 30
GND GND GND GND GND DCDC_ADJ
31 32 33 34 35 36
GND LDO_ADJ GND DCDC_OUTPUT 3V8_EVB VSERV_FB
37 38 39 40 41 42
NC NC GND GND GND GND
43 44 45 46 47 48
NC NC NC VSERV VSERV VSERV
49 50 51 52 53 54
NC NC NC NC NC NC
55 56 57 58 59 60
NC NC UART3_TXD UART3_RXD UART3_RTS UART3_CTS
61 62 63 64 65 66
NC NC NC NC NC TP153
67 68 69 70 71 72
NC NC NC NC NC NC
73 74 75 76 77 78
NC NC NC NC NC JTAG_DETECT
79 80 81 82 83 84
OLD_TLB_G GND GND TLB_DETECT GND GND
ND
85 86 87 88 89 90
GND GND GND GND GND GND
91 92 93 94 95 96
#RESET #ON_OFF STAT_LED LED_DRV SW_RDY/SYSTEM_ON #SHDN
97 98 99 100 101 102
GND GND GND GND JTAG_TRIGOUT JTAG_TRIGIN
103 104 105 106 107 108
GPS_PPS GPS_RFPAO GPS_CLK GND JTAG_SUPPLY JTAG_PS_HOLD
N
109 110 111 112 113 114
GND GND GND GND JTAG_TDI TP152
115 116 117 118 119 120
JTAG_TMS JTAG_TDO #JTAG_TRST JTAG_TCK JTAG_RTCK #JTAG_RESOUT

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5 Extra Connectors on Bottom Side

5.1 Extra Connectors Layout (Bottom View)

SO1301 2x20 Female

Reserved for future use.

PL1301 2x3 Female

Reserved for future use.

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6 Power Supply
During the final product development phases, it might be necessary to supply the
module with low-level voltages (either 1.8V, 3.3V, or 3.8V) from an external DC source
located close to the board and through a wire of adequate section. This case is defined
as “DIRECT SUPPLY”.
Other users will just need to start working with the target module quickly and with
reduced external devices. In this use case, a wall adapter connected to the board
through the on-board regulator will be the optimal solution. This case is defined as “VIA
DCDC”.
Both approaches are supported with Telit EVB 2.0, hybrid solution is also possible.
Quite often, a user must source the target in DIRECT SUPPLY mode (i.e., to be closer to a
“real application” situation, or to observe the module current consumption) while also
powering up the remaining EVB circuitry with a separate power supply (that is, via DCDC).
For each of the four rails, the following options are available:
• Vbatt, feeding the baseband part of the target module
• Vbatt_PA, feeding the RF part of the target module
• Vbatt_AUX, feeding the auxiliary circuits NOT belonging to the module
• 3V8_EVB, feeding auxiliary Telit EVB 2.0 circuits, fixed at 3.8V
These voltages are displayed on the selector from left to right, as shown below.

Figure 3: 4 Ways Power Selector

Note: VIA DCDC can in turn be sourced by the wall adapter or, using the 3x1
male header selector, by the 5v of the USB DEVICE PWR.

6.1 Example Use Cases

Use Case 1:
The TLB is powered externally by DIRECT SUPPLY, while the Telit EVB 2.0 is powered by
VIA DCDC. The Telit EVB 2.0 must always receive 3.8 V, so it is most frequently connected
to the internal fixed regulator.

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Figure 4: Use Case 1: 4 Ways Selector

Warning: This rail can only be connected to DIRECT SUPPLY when the external
power supply is set to 3.8V.
Use Case 2:
The two most central headers on the left are the device's supply terminals, so if a
separate DC source is required, connect to these two headers.

Figure 5: Use Case 2: 4 Ways Selector

Note: Refer to section 5.6 Power Consumption Measurement for more

information and use cases.

6.2 Vbatt Voltage Level

Telit modules typically require either 3.8V, data cards require 3.3V, and 1.8V is the
standard voltage for positioning modules. Please follow the guidelines below to provide
the correct voltage to each Telit module:
When in DIRECT SUPPLY mode,
The user is responsible for setting the correct voltage on the external power supply.
When in VIA DCDC mode,
For LEGACY TLB’s
The voltage for LEGACY TLBs is selected using the EVB's 3.3v/3.8V voltage selector
(please remember no LEGACY TLB supports positioning modules, thus there is no need
for 1.8V selection)
For SMART TLB
The voltage is automatically set (that is AVS, Automatic Voltage Selection is
implemented). A resistor mounted on the TLB properly biases the voltage regulator
network and triggers the Vbatt voltage to be set according to the module mounted on the
TLB.

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6.3 Power Supply Configuration

No-Leak Jumper
NO_LEAK is a jumper that disconnects reverse polarity protection diodes, over-voltage
protection, and stabilization capacitors. These components introduce current leakage
thus this jumper must be removed during current consumption tests.
The adjacent “coffee bean” is a solder bridge that can be easily bridged with a solder ball
and is placed parallel to the no-leak jumper.

Figure 6: No-leak Jumper

Source Selector
When the VIA DCDC mode for some supply rail is used, it is possible to select the power
source that can be supplied.
Power source from the wall adapter (5V-12V, connected to the 5.5x2.5 mm jack): when
the jumper is moved to the right position.

Figure 7: Source Selector in 12V position

Power source from the 5V USB-PWR (USB DEVICE PWR): when the jumper is moved to
the left position.

Figure 8: Source Selector in USB-PWR position

Power source from the 5V USB-FTDI (USB EVB FTDI): when the central pin is directly
connected via a wired jumper to the pin “USB_EVB” of the “DOMAINS” connector (look at
the chapter Voltage Domains for further details about this connector).

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Figure 9: Source from USB-FTDI

Voltage Selector
On the legacy TLB board (developed before Telit EVB 2.0 introduction), no AVS
(Automatic Voltage Selector) is available, thus the DCDC regulator must be set to the
voltage needed by the device using the voltage selector switch.
• With the selector set on the left position, the voltage is set to 3.3V.
• With the selector set in the right position, the voltage is set to 3.8V.

Figure 10: Voltage Selector

Note: On the "SMART TLBs" this selector does not affect voltage selection.

Kill Push Button

The KILL button, located in the top right-hand corner of the Telit EVB 2.0, is designed to
choke the device by disabling the DCDC regulator.
It is not recommended to use this button to power down the Telit module because the
device must be turned off properly. This feature is only available to allow the user to
simulate a sudden power supply interruption.

Figure 11: Kill Push Button

6.4 Power Supply Requirements

In DIRECT SUPPLY mode, the wirings impedance should be kept under control and must
be less than 150mΩ, with an inductance not greater than 1µH. In general, a 0.5m long
18AWG wire is suitable.
In VIA DCDC mode, the wall adapter connected to the jack can supply a voltage in the 5V-
12V range. The regulator can accept up to 36V (42V absolute maximum) but, in this case,
the output voltage (Vbatt) will not be properly regulated.
Note: A minimum current of 1.25A is required.

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The cylindric jack is a 5,5x2,5 mm type with the inner terminal positive.
The WALL ADAPTER must fulfill the following requirements:
Table 9: WALL ADAPTER Requirements
Wall Adapter Value
Nominal Supply Voltage 8 V ÷ 12 V
Operating Voltage Range 4.8 V - 13 V (TBC)
Extended Voltage Range 4.8 V - 24 V (TBC)
Current sourced >=1.25A
Warning: When the power supply wire voltage drops to 4.8-5V (especially with
thin wires), the 3.8V module may experience undervoltage.

6.5 4-Wires Connection for Direct Supply

Any voltage drop due to connections or high-impedance wires is a potential issue for the
target and, in some cases, can lead to unexpected device switch-off (when Vbatt falls
below the minimum threshold). Thus, to prevent issues, it is recommended to use short
and thick wires to supply power to the Telit EVB 2.0.
If possible, use the 4-wire connection (2 source cables and 2 sense cables), connecting
all wires at the endpoint on the four dedicated pads on the Telit EVB 2.0. Termination”
capacitors - requested by the external Power Supply to be stable – are already mounted
on the Telit EVB 2.0.
A long cable without detection could be affected not only by voltage drops, but could
also lead to power supply instability (that is voltage overshoot, thus permanent device
failure).

Direct Supply
Soldering is the best connection method to prevent voltage drops. To ensure good
mechanical retention as well, it is recommended to pass the wires through the cable lock
slot.

Figure 12: Direct Supply and Direct Supply with Sense

6.6 Power Consumption Measurement

The Telit EVB 2.0 not only allows different power supply configurations (as explained in
the previous chapter), but at the same time supports different methods to measure the
current consumption of the Telit module connected to the Telit EVB 2.0 :
Current measurements through a current meter (EVB powered VIA “4 Ways Selector”)

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Current measurements current through an external power supply (Telit EVB 2.0
powered via “Direct Supply”)
Current measurements through a shunt resistor.

Figure 13: Current measurement points: 4 Ways Selector, Direct Supply, and shunt resistor

With the first two methods, it is possible to measure the current separately for VBATT,
VBATT_PA, VBATT_AUX, and 3V8_EVB rails.
Note: Each current component can be measured separately only if allowed by
the TLB geometry. Please check the TLB schematic to verify if these paths are
available separately.

Measuring the Current by a Current Meter

The board is fully powered VIA DCDC. The current consumption of the device can be
measured by placing an Ammeter in series to the desired rail.
The image below shows the VBATT measurement configuration.
Please ensure that the ammeter wires are properly sized. Avoid using thin or long wires
because their high impedance could lead to voltage drop and the device could
malfunction (disconnection, switch off).

Figure 14: Ammeter Insertion

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Measurement setup example:

Figure 15: Measurement Setup with Ammeter

Measuring the Current by a Power Supply

In this case, only the device is powered by an external source via DIRECT SUPPLY, while
the TLB's auxiliary parts and the Telit EVB 2.0 board are powered via DCDC. A key
requirement is that the external power supply must be able to perform current
measurements.
The image below shows how to measure the consumption of the device.

Figure 16: Measure the Current by a Power Supply

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Example of measurement setup:

Figure 17: Measurement Setup with Ammeter

Note: Remove the NO-LEAK jumper to avoid leakage currents due to the
protection network and the stabilization capacitors.

Figure 18: Avoiding Leakage Current

Measuring the Current through the Shunt Resistor

The device is exclusively powered via DCDC.
The device current consumption (total current consumption on VBATT and VBATT_PA) is
indirectly measured by measuring the voltage across the 50 mΩ shunt resistor.

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Figure 19: Measure the Current through the Shunt Resistor

6.7 VAUX/PWRMON Power Output

Most Telit modules include a regulated power supply output to supply small devices
from the module itself, such as level translators, audio codecs, sensors, and so on.
Due to the different architectures, devices provide different voltages (usually 1.8V, rarely
2.8V) and current values, some as high as 50mA, some as low as 1mA. The current
flowing through this port adds up to the Vbatt current consumption. This is fine when
the module is mounted on the final application, but is not acceptable when it is on top of
the Telit EVB 2.0, because in this way the consumption measured on the Telit EVB 2.0 is
not in line with the specs (recall that the specs can not know in advance the currents
drained from the ports of the module). So, on the Telit EVB 2.0, this Vaux/powermon
port is buffered.
On the final application, the buffer is needed only if the load current exceeds the
Vaux/powermon current budget.
At the same time, if desired, VAUX/PWRMON1/2 pins are available for supplying the
translators through a 0-Ohm jumper. They are available as well on their pin header to
allow the user to connect external application hardware and test the system.
Note: When connecting a load on this net, the related current will bias positively
the current drawn by the device. Please take this into account when evaluating
device power consumption.

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7 VOLTAGE DOMAINS
All voltage domains are grouped in the frontal area of the board and are available on a
dedicated male connector (2x4 pins, 2.54 mm): on this connector, each pin represents a
specific voltage domain. Each voltage name is silk-screened on the board to allow quick
identification.

Figure 20: Voltage Domains

This connector makes testing and debugging operations easy because it allows internal
or external connections using wire jumpers.
Warning: Use this connector only for voltage monitoring or to power light loads:
except for “USB_EVB +5V” do not exceed 5mA.
In case of overload, short circuit to ground, or shorts between different voltage
domains, the equipment will be irreversibly damaged
Don’t connect an external power supply to these pins or catastrophic equipment
failure may occur.
Note: Since the +5v VBUS of the “EVB FTDI” USB connector is brought to the Pin
“USB_EVB +5V” of the DOMAINS connector, using a wired jumper to connect it to
the central pin of “Source Selector”, is it possible to take the +5v supply to the
input of the DCDC regulators. This allows to supply of the Telit EVB 2.0 using the
USB connected to the FTDI chip. This connection is useful but could be not so
ideal (because of the voltage drops on the wired jumper) and has to be tested in
case of high current consumption (i.e. module in GPRS connection with 4 active
TX-slots).

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8 Digital Section
Most of the device pins available on the Telit EVB 2.0 are digital.
Its supply domain is VDDIO_1V8/2V8 and is set to 1.8V or 2.8V depending on the device
(legacy TLBs are satisfied with 1.8V, smart TLBs set the voltage on its own).
These signals mostly terminate on a male connector, allowing the user to connect to
other boards using wire jumpers.
Some of these lines are not terminated on a header and are connected directly to a
peripheral (that is the serial or the DVI lines). In such cases, there are a couple of
headers with jumpers: this allows the signals to function normally, but also to be
interrupted to facilitate testing, debugging, and measuring.
Where possible, the name of the signal is silk-screened on the board to allow quick
identification.
Digital pins are grouped in the frontal area of the board and are available on 2x4 pins,
and 2.54 mm connectors.

Figure 21: Digital Section: Pinout

8.1 Power On
In most cases, a button connecting a pin to the ground is the proper way to turn on Telit
devices.
In the other cases, there will be an adapter circuitry on the TLB that translates the open
collector interface with the appropriate one, depending on the specific device.
Note: In this document, all inverted lines (that is, active low signals), are labeled
with a name ending with ’#’,’*’, or with a bar above the name.
Warning: To check if the device has powered on, the hardware line PWRMON
should be monitored.
No pull-up resistor should ever be used on the ON_OFF* line since it is internally
pulled up. Using a pull-up resistor may cause problems with improper latching
and power on/off of the module. The ON_OFF* line must be connected only in an
open collector or open drain configuration.

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8.2 Communication Ports

USB DEVICE (USB PWR) and USB EVB (FTDI)
The Telit EVB 2.0 mounts two USB-C connectors labeled “DEVICE” and “EVB”.
Normally, communication between the TLB-mounted device and the host PC takes place
either through a USB DEVICE port or UART lines (translated by the FTDI chip).

Figure 22: USB DEVICE (USB PWR) and USB EVB (FTDI)

The USB DEVICE is the upper one and is connected to the Telit module USB port.
Through this port it is possible to power the Telit EVB 2.0, provided that the source
selector is set on the left position (refer to 0 Source Selector).
Note: Some TLBs provide an onboard USB connector instead of relying on the
USB port mounted on the EVB. Please refer to the TLB hardware documentation
for further information.
The USB EVB (FTDI) is connected to an FTDI 4-channel port translator splitting the USB
bus into one I2C interface and three UART lines.
The 3 UART lines are connected to the device serial lines and are mapped as Virtual Com
Ports on the host PC.
Note: When the USB DEVICE (USB PWR) is used as a power source, make sure
the USB cable is as short and thick as possible, to avoid voltage drops on the
cable that can cause issues.
Please note that a regulator must have some voltage headroom to produce a
reliable output voltage and the voltage drops reduce this margin.

UARTs Pins Naming Convention

On the Telit EVB 2.0 schematic, there is an apparent misalignment between the pin's
direction and its naming.
Note: Pins direction is inverted because, on the main UART, the host is
considered the DTE (as per V.24 standards). On the other hand, for the other 2
UART lines, the Telit device is rated as DTE so the host becomes a DCE.

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Serial Ports
The three serial ports are listed below:
• MODEM SERIAL (Main) is the port dedicated to the AT commands
• AUX SERIAL is a second port for modules supporting two serial ports
• UART3 SERIAL is a spare serial port, often used by the GNSS receiver integrated into
cellular devices
Each serial line must be configured as 115200 8-N-1 unless otherwise specified.
Serial port lines can be monitored (for example with a scope or logic state analyzer) or
disconnected, thanks to dedicated jumpers placed on the front of the board. Each line
jumper is silk-screened to allow easy identification. These lines operate at the same
voltage as the module under test, as they are the device communication ports.
This allows to interface of the Telit device with the customer hardware prototype.
Note: For minimal implementation, only TXD and RXD lines can be connected,
with the other lines left floating as long as software flow control is implemented.
To avoid back powering effect, it is recommended to prevent HIGH logic level
signals from being applied to the digital pins when the device is powered off or
during an ON/OFF transition.

8.3 SIM Card Holders

Since some cellular modules support two SIM interfaces, the Telit EVB 2.0 mounts two
SIM card holders.
The default SIM holder is the one labeled“SIM1” on the left.

Figure 23: Sim Holders

Warning: Troubleshooting in SIMIN detection: for EMC reasons, a capacitor has

been placed on the SIMN1 and SIMIN2 switching lines, which, for some modules,
may be excessive and indicate "SIM present" when using the AT command "CPIN?"
for SIM detection even though it is not there: in this case, the solution is to
remove, from the EVB 2.0, these capacitors (see the image below).
On your application: leave these capacitors not populated or, if necessary, mount
capacitors on SIMN1 and SIMIN2 lines if suggested in the hardware user guide for
the specific module.

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Figure 24: Bottom side view: highlighted the capacitors that must be removed in case of SIM
detection error

8.4 SDIO Interface

At the top center of the Telit EVB 2.0, an SDIO card connector is mounted.
SDIO cards are supplied with 3.3V: this rail (derived from the 3V8_EVB line) is always on
when the board is powered on.

Figure 25: SDIO Interface

8.5 LEDs
Current Monitor
When exceeding about 100mA current draw, the LED switches on.

Figure 26: Current Monitor LED

STAT_ LED
Indication of Network Service Availability

Figure 27: STAT LED

The STAT_LED pin status displays network service availability and call status. The function
is available as an alternative function of GPIO_01 (to be enabled using the
AT#GPIO=1,0,2 AT command). Please refer to each module documentation for
information on network service LED status.

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STAT_LED status is defined according to the table below:

Table 10: LED Status
Device Status Led Status
Device off Permanently off
Not Registered Permanently on
Registered in idle Blinking (1s on + 2 s off)
Registered in idle + power saving Depends on the event that triggers the wakeup (In
sync with network paging)
Connecting Blinking 1s on + 2s off

PWRMON
This LED switches on when the module is operative.

Figure 28: PWRMON LED

SW_RDY/SYSTEM_RDY
This LED switches on when the module is ready to operate.
Note: Only some Telit devices support this function.

Figure 29: SW_RDY/SYSTEM_RDY LED

SPARE_LED
This LED is a visual test probe that switches on when the test point (a pin labeled
“SPARE” located in the header connector placed near the LED) connected by the user
reaches the high logic level.

Figure 30: SPARE LED and

GPS PPS
This LED switches on when the device enables 1PPS output and the level is high: it’s the
1PPS display, typical for positioning devices.

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To make this signal (level 3.3V) available for external use, an SMA connector has been
placed near the homonymous led

Figure 31: PPS LED

USB DEVICE ON
This LED switches on when the USB DEVICE is powered, and the USB controller is
enabled.

Figure 32: USB DEVICE LED

USB EVB FTDI ON

This LED switches on when the host PC operating system enumerates the USB instance
of the FTDI-level converter.

Figure 33: FDTI LED

Audio ON
This LED switches on when the “carrier” signal is present on the audio jack. It detects
when the balanced output lines reach ½ VDD stage and is ready to produce sound.
The indication is supported for both digital and analog audio chains.

Figure 34: AUDIO_ON LED

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8.6 Push Buttons

Figure 35: Push buttons

Warning: Troubleshooting in push buttons functions: for EMC reasons,

capacitors have been placed on the USB_BOOT, RESET, SHDN, and ON/OFF lines,
which, for some modules, may be excessive and could be the cause of unwanted
behavior. For example, the module may go in BOOT-Loader mode as USB_BOOT
would be pressed.
To avoid unwanted behavior, it is strongly recommended to remove from the
bottom side of the EVB 2.0, the following four capacitors:

Figure 36: Troubleshooting buttons

WCI_RX
This push button is available for compliance with some existing Telit devices requiring
this line.

USB_BOOT
FORCED_USB_BOOT pin must be activated only during the firmware upgrade operation.
Normally it must be left idle.

RESET
Some devices require a low level on this line as a RESET command.

SHDN
Some devices require a low level on this line as a SHUTDOWN request.

ON/OFF
This is the ON/OFF push button: keeping it pressed for a few seconds switches the
device ON or OFF.
The adjacent “AUTO_ON” switch, is a “comfort gadget” for users who want to emulate the
ON/OFF button always pressed. When activated, it “holds down” the ON/OFF push
button permanently.

KILL
This push button abruptly stops the main DCDC regulator, causing a power disruption if
a device is powered through DCDC. It is the forced power-cycle function.
Warning: Use of KILL is not recommended.
Make sure to follow the switch-off procedures for the specific device in the
application. It is provided on the Telit EVB 2.0 for testing purposes only.

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9 Audio Section
The Telit EVB 2.0 AUDIO interface includes a headphone amplifier, typically not present
on Telit evaluation boards: this solution was chosen since loudspeakers are referenced
to ground, thus avoiding tantalum DC block capacitors causing audio clicks and pops.
The user interface is a CTIA standard hand-free TRRS 3.5mm jack or a 4 test points array
in 2.54mm pitch.

Figure 37: Digital Audio Jumpers Configuration

Since a CODEC (provided with a local clock and I2C pull-up) handles the conversion, the
other end, towards the device under test, can be easily operated as an analog or digital
interface.
This I2C interface (necessary to configure and activate the codec) is different from that of
the FTDI chip: it belongs to the I2C port of the module under test.
Some Telit modules have dedicated I2C pins, known as "native I2C", while others share
lines between GPIO and I2C.
The I2C selector allows one to choose between native I2C and GPIO1/2: if different GPIO
lines must be used, it is suggested to connect them using the supplied wired jumpers.
To provide the user with maximum flexibility, all audio and codec signals are routed
through a pair of jumpered headers. For example, a handsfree can be connected directly
and jumpers can be removed to connect external circuitry.
To initialize the audio codec using GPIO1 as SDA and GPIO2 as SCL, the following
commands from the AT interface must be sent:
AT#I2CWR=1,2,30,4,19
00109000100A330000330C0C09092424400060 <CTRL-Z>
AT#I2CWR=1,2,30,17,1
8A <CTRL-Z>

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Note: These setup commands via I2C have to be re-issued after the Module gets
back from sleep.
Warning: ATroubleshooting at modules startup: if a module gets stuck at startup,
please check the jumpers setting for the audio codec: if connected to GPIO1/2,
remove the jumpers or keep them in the left “B2B” position on the I2C selector
(see Figure 38) until the module boots up.
To use the audio in ANALOG MODE, the jumpers must be set as shown in the image
below:

Figure 38: Jumpers Configuration for Audio in Analog Mode

Telit module's digital audio interface (DVI) is based on the I2S serial bus interface
standard. The audio port can be connected to the end device using the digital interface,
or via one of the several compliant codecs (in case an analog audio is needed).

9.1 Electrical Characteristics

The product is providing the DVI on the following pins:
Table 11: DVI Pins
Signal I/O for the device Function Type
DVI_WA0 Output for Device (MASTER) Digital Audio Interface (Word CMOS
Input for Device (SLAVE) Alignment / LRCLK) 1.8V/2.8V
DVI_RX Input for Device Digital Audio Interface (RX) CMOS
Output for Codec 1.8V/2.8V
DVI_TX Output for Device Digital Audio Interface (TX) CMOS
Input for Codec 1.8V/2.8V
DVI_CLK Output for Device (MASTER) Digital Audio Interface (BCLK) CMOS
Input for Device (SLAVE) 1.8V/2.8V

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10 Mechanical Design
10.1 Drawing

Figure 39: Board Mechanical Drawing (dimensions are in millimeters)

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11 Acronyms and Abbreviations

Table 12: Acronyms and Abbreviations
Acronym Definition
EVB Evaluation Board
FTDI Future Technology Devices International
I/O Input Output
SIM Subscriber Identification Module
TLB Translation Board
UART Universal Asynchronous Receiver Transmitter
USB Universal Serial Bus

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12 Related Documents
Refer to https://dz.telit.com/ for current documentation and downloads.
Table 13: Related Documents
S.no Book Code Document Title
1 1VV123456 Document Title 1
2 1VV123456 Document Title 2
3 1VV123456 Document Title 3

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13 Document History
Table 14: Document History
Revision Date Changes
4 2023-11-10 Template upgrade
3 2022-11-16 Note added on B2B connector pinout table and USB
connector on TLB
2 2022-10-04 Added a note related to the use of GPIO1/2 for audio codec
Added a note related to the effect, at the module startup, of
the capacitor connected to the push buttons
1 2022-06-23 Added a note related to the SIM detection
0 2022-03-16 First document revision
From Mod.0818 Rev.11

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© Telit 2023 All rights reserved.

Technical Documentation
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