Telit Wireless Solutions LM940 Design Guide

LM940 Hardware Design Guide
1VV0301352 Rev. 18 Page 45 of 75 2022-01-04
Not Subject to NDA
Pin
Signal
I/O
Function
Type
Comment
19
SIMIO2
I/O
Data connection with an external UIM2
card
1.8 / 2.85V
17
SIMCLK2
O
Clock output to an external UIM2 card
1.8 / 2.85V
7
SIMRST2
O
Reset output to an external UIM2 card
1.8 / 2.85V
SIM Card Interface 2 – LM940 2.0
16
SIMVCC2
O
Supply output for an external UIM2 card
1.8 / 2.85V
Power
19
SIMIO2
I/O
Data connection with an external UIM2
card
1.8 / 2.85V
17
SIMCLK2
O
Clock output to an external UIM2 card
1.8 / 2.85V
6
SIMRST2
O
Reset output to an external UIM2 card
1.8 / 2.85V
Digital I/O (GPIOs)
3
GPIO_01
I
UIM1 Card Present Detect
1.8V
GPIO_01 can be
used as SIMIN1
5
GPIO_02
I
UIM2 Card Present Detect
1.8V
GPIO_02 can be
used as SIMIN2
Table 28: SIM Interface Signals
6.6.2.1. SIM Schematic Example
The following Figures illustrate in particular how the application interface should be
designed.
Figure 16: SIM Schematics
Note: LM940 contains an internal pull-up resistor on SIMIO. It is not
necessary to install external pull – up resistor.

Telit Wireless Solutions LM940 Specifications

General

Brand	Telit Wireless Solutions
Model	LM940
Category	Wireless modules
Language	English