Telit Wireless Solutions LN920 TLB User manual

LN920 TLB
HW User Guide
1VV0301735 Rev. 0 –2021-07-15
Telit Technical Documentation

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APPLICABILITY TABLE
PRODUCTS
PART NUMBER
LN920A12-WW
TBD
LN920A6-WW
TBD

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CONTENTS
APPLICABILITY TABLE 2
CONTENTS 3
1. INTRODUCTION 5
Scope 5
Audience 5
Contact Information, Support 5
Symbol Conventions 5
Related Documents 6
2. GENERAL PRODUCT DESCRIPTION 7
Overview 7
TLB View 8
TLB Description 10
Jumpers Setting Guidelines 13
Antenna Ports 14
Guidance for Evaluation Board Configuration 14
2.6.1. Bypass Setting 16
2.6.1.1. Jumper Setting for Bypass Mode 17
2.6.2. 6-15V Setting 17
2.6.2.1. Guidelines of ECO for 3.3V Output of DC-DC Converter 17
3. COMPONENT ASSEMBLY DIAGRAM 20
Layout 20
4. SCHEMATICS 22
5. CHANGE LIST 26
6. PRODUCT AND SAFETY INFORMATION 27
Copyrights and Other Notices 27
6.1.1. Copyrights 27
6.1.2. Computer Software Copyrights 27
Usage and Disclosure Restrictions 28
6.2.1. License Agreements 28

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6.2.2. Copyrighted Materials 28
6.2.3. High Risk Materials 28
6.2.4. Trademarks 29
6.2.5. Third Party Rights 29
6.2.6. Waiwer of Liability 29
Safety Recommendations 30
7. GLOSSARY 31
8. DOCUMENT HISTORY 32

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1. INTRODUCTION
Scope
This document describes the LN920 TLB which is part of complete LN920 Development
Kit (Dev-Kit).
Audience
This document is intended for system integrators that are using the Telit LN920 module
Translation Level Board (TLB).
Contact Information, Support
For technical support please e-mail:
• TS[email protected]
• TS[email protected]
• TS[email protected]
• TS[email protected]
Alternatively, use:
https://www.telit.com/contact-us/
For more information visit:
https://www.telit.com
Symbol Conventions
Danger: This information MUST be followed or catastrophic
equipment failure or personal injury may occur.
Warning: Alerts the user on important steps about the module
integration.

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Note/Tip: Provides advice and suggestions that may be useful when
integrating the module.
Electro-static Discharge: Notifies the user to take proper grounding
precautions before handling the product.
Table 1: Symbol Conventions
All dates are in ISO 8601 format, that is YYYY-MM-DD.
Related Documents
•LN920 HW User Guide, 1VV0301730
•Telit EVB (Evaluation Board) User Guide, 1VV0301249
•LN920 AT Commands Reference Guide, TBD

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2. GENERAL PRODUCT DESCRIPTION
Overview
The Translation Board (TLB) is custom designed to interface the Telit LN920 M.2 data
card with the Telit Generic Evaluation Board (EVB), thus forming the complete
Development Kit of LN920.
The TLB provides mapping of Telit module signals and functions into the generic EVB
signals and functions.
The LN920 TLB includes –among others - the following items:
•RF SMA connectors
•Board to Board connectors for interfacing to EVB main board
•Module specific circuitry which is not part of the generic circuitry of the EVB
The TLB includes a M.2 module socket, making the data card removable from the TLB.
The Power supply and control interface for the RF module is provided by the EVB through
the B2B connectors, located on the bottom side of the TLB and connecting the TLB to the
EVB.
The bottom plane solder-mask is cutout under the RF module to allow mounting a
heatsink to cool the module through the PCB GND via’s.
The board is designed to host M.2 modems using LN920 pin mapping (42.0 x 30.0 x 2.3mm,
+/- 0.15 mm tolerance and 75 pins).
Board
PCB Code
TLB
CS2146
EVB
CS1984C or CS1742E
Module
LN920
Table 2: Latest PCB reference numbers

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TLB View
The below pictures show the TLB top and bottom view.
LN920 TLB Top View
Figure 1: TLB Top View

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LN920 TLB Bottom View
Figure 2: TLB Bottom View

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TLB Description
Figure 3: TLB Description
(1) GNSS/LTE Antenna Connector
In case of LN920, only 2 out of 4 LTE antenna connectors are used. The central
RF connector is dedicated to GNSS, while the secondary cellular LTE antenna
can be shared between cellular AUX antenna and GNSS receiver.
The other two RF connectors –if mounted - are reserved for other Telit M.2
products.
Figure 4: Antenna Connector Description

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(2) 1.8V VAUX/PWRMON (PL601/PL606)
Figure 5: 1.8V VAUX/PWRMON
The Jumper PL601/PL606 allows to supply 1.8V I/O power to the Telit EVB.
Place jumpers on PL601 1-2 and PL606 1-2 as indicated in Table 3.
(3) SCK_GPIO5 (PL216)
The Jumper PL216 allows to connect SCK_GPIO5 (M.2 pin 20) to general EVB.
Place jumpers on PL216 1-2 and PL606 1-2 as indicated in Table 3.
(4) USB Type C (U303/PL301/PL302)
The Jumper PL301/PL302 allows to supply 3.3V power to the USB switch blockto
support USB 3.1 gen1 by using USB Type C connector. (U303)
Place jumpers on PL301 1-2 and PL302 1-2 as indicated in Table 3.
Figure 6: SCK_GPIO5 and USB Type C

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(5) FULL_CARD_POWER_OFF_N / W_DISABLE_N
Figure 7: Auto Power ON / W_DISABLE_N
- FULL_CARD_POWER_OFF_N
Place jumper on PL214 1-2: LN920 Power ON
Remove jumper from PL214: LN920 Power OFF
- W_DISABLE_N
Connecting a jumper to PL201 activates the W_DISABLE_N function. (Power
Saving Mode).
Please refer to the AT#PSMWDISACFG section of the LN920 AT Commands
Reference Guide.
(6) Other Jumpers and Connectors
All other Jumpers and Connectors are reserved for other Telit M.2 products or
for future use.

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Jumpers Setting Guidelines
Figure 8: Default Jumper Setting of TLB
Jumper
Jumper Type
Set Position
Description
PL214
2.54 mm
1-2
Power ON
PL301/PL302
2.54 mm
1-2
3.3V Power for USB type C
PL216
2.54 mm
1-2
Connect SCK_GPIO5 to EVB main board
PL601/PL606
2.54 mm
1-2
1.8V Power for 1.8V I/O circuitry (VAUX/PWRMON)
Table 3: Default Jumper Setting of TLB and Description

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Antenna Ports
Figure 9: Antenna Ports
Note: For more detailed information on Antenna ports, please refer
to the LN920 HW User Guide, 1VV0301730, Chapter 7.1 Antenna
Interface.
Warning: Be careful not to damage cables and RF connectors
assembly when connecting the Antenna cables.
Guidance for Evaluation Board Configuration
The EVB can be configured for different power supply sources depending on the required
use case.

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Figure 10: EVB Power Supply
The EVB main power connector is PL101/SO101 with an input range of 6-15V.
Normally (i.e. in a typical SW developers setup), the EVB is supplied from the main power
connector, and a DC-DC buck supply with a set point of 3.9V is used to provide the system
VBAT. Thus, the default jumper configuration is as follows: PL103/2-3; PL106/1-2;
PL105/2-3.
PL102 allows an external configurable power supply to feed directly the VBAT input
supply to the LN920, while all the auxiliary peripherals are fed through the main power
connector.
Note: For more detailed information of power supply source
selection, please refer to 1VV0301249 Telit Evaluation Board (EVB)
HW User Guide, Chapter 3.1 Supply Source Selection.

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Figure 11: Default Jumper Setting of Telit EVB
2.6.1. Bypass Setting
Power Supply
Value
Voltage / Max.Current
3.3 V ±5 % / TBD A
Table 4: Power Supply Requirement
Figure 12: Connecting Power Supply and Telit EVB

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2.6.1.1. Jumper Setting for Bypass Mode
PL106/2-3
Figure 13: Jumper Setting of Telit EVB for Bypass Mode
2.6.2. 6-15V Setting
The EVB main power connector is PL101/SO101, with an input range of 6-15V DC.
It is usually connected to a DC power supply or power adapter.
6-15V DC input power is connected to DC-DC converter block and step down to 3.9V to
supply the LN920 module.
The output voltage of DC-DC converter is designed as 3.9V and it does not meet the LN920
M.2 card power supply specification.
Therefore, it is necessary to proceed with a modificatio to supply 3.3V power through the
process described below (2.6.2.1 Guidelines of ECO for 3.3V Output).
2.6.2.1. Guidelines of ECO for 3.3V Output of DC-DC Converter
•Step 1
When using a supply 6-15V or 12V adapter, please change the header as
highlighted in red in the image below (PL106/1-2)
PL101: Power Supply Connector
Power source by adjustable power supply: 6-15V

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Figure 14: Power Supply Connector
SO101: 12V adapter connector
Power source from 12V adapter, such as the one supplied with Telit EVB
Figure 15: 12V adaptor connector
•Step 2
Power source by DC-DC convertor is supplied from PL101/SO101.
As previously mentioned, the output voltage for which the DC-DC converter is
designed is 3.9 V and it does not meet the LN920 M.2 card power supply
specification.
To change the 3.3 V output of DC-DC converter for LN920 module, it is
MANDATORY to change R107, which is a 1.69 K ohm general 0402 resistor.

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Note: It is highly recommended to use a 1.69 KOhm, 1/16W, 0402 inch
resistor with 1% tolerance for stable 3.3V output.
<Bottom View of PCB, CS1742E>
Figure 16: Bottom View of PCB, CS1742E

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3. COMPONENT ASSEMBLY DIAGRAM
Layout
Component Diagram Top View
Figure 17: Component Diagram Top View