LM940 TLB Hardware Design Guide
1VV0301384 Rev. 1
Page 7 of 28
2021-06-16
Not Subject to NDA
2.
GENERAL PRODUCT DESCRIPTION
Overview
The Translation Board (TLB) is custom-designed to interface the Telit LM940 module with
the Telit Generic Evaluation Board (EVB), thus forming the complete LM940 Development
Kit.
The TLB maps Telit the signals and functions of the Telit module into generic EVB signals
and functions.
The LM940 TLB design includes the following items:
•
LM940 socket
•
RF SMA connectors
•
Board to Board connectors for interfacing to EVB main board
•
Module specific circuitry which is not part of the generic EVB circuitry
Power supply and control interface for the module is provided by the EVB through the
board-to-board (B2B) connectors.
To monitor the temperature, a thermistor is placed close to the module on the upper
ground plane: this in order to properly measure the temperature of the rear of the module.
Under the module, the bottom plane PCB solder-mask is cutout to optimally mount/attach
a heatsink aiming to cool the module.
The board is designed to accommodate modules according to the LM940 MINI PCIE (50.95
x 30.00 x 2.70mm, +/- 0.15 mm tolerance and 52 pins) updated pin mapping.
PCB reference numbers:
Board
PCB Code
EVB
CS1742E
TLB
CS1824A, CS1914B
Module
LM940 1.0, LM940 2.0 (CS1822x)
Table 2: PCB reference numbers
