Telit Wireless Solutions LN920 TLB User manual

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

LN920 TLB Hardware User Guide
1VV0301735 Rev. 0 Page 2of 33 2021-07-15
Not Subject to NDA
APPLICABILITY TABLE
PRODUCTS
PART NUMBER
LN920A12-WW
TBD
LN920A6-WW
TBD

LN920 TLB Hardware User Guide
1VV0301735 Rev. 0 Page 3of 33 2021-07-15
Not Subject to NDA
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

LN920 TLB Hardware User Guide
1VV0301735 Rev. 0 Page 4of 33 2021-07-15
Not Subject to NDA
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

LN920 TLB Hardware User Guide
1VV0301735 Rev. 0 Page 5of 33 2021-07-15
Not Subject to NDA
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.

LN920 TLB Hardware User Guide
1VV0301735 Rev. 0 Page 6of 33 2021-07-15
Not Subject to NDA
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

LN920 TLB Hardware User Guide
1VV0301735 Rev. 0 Page 7of 33 2021-07-15
Not Subject to NDA
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

LN920 TLB Hardware User Guide
1VV0301735 Rev. 0 Page 8of 33 2021-07-15
Not Subject to NDA
TLB View
The below pictures show the TLB top and bottom view.
LN920 TLB Top View
Figure 1: TLB Top View

LN920 TLB Hardware User Guide
1VV0301735 Rev. 0 Page 9of 33 2021-07-15
Not Subject to NDA
LN920 TLB Bottom View
Figure 2: TLB Bottom View

LN920 TLB Hardware User Guide
1VV0301735 Rev. 0 Page 10 of 33 2021-07-15
Not Subject to NDA
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