User's Guide

LM940 HW Design Guide
1VV0301352 Rev. 2 Page 40 of 68 2017-07-19
6.5.2.1. SIM Schematic Example
The following Figures illustrate in particular how the application side should be designed.
SIM Schematics
SIM_CARD
LM940
SIMIO
SIMCLK
SIMRST
SIMVCC
C1
C2
C3
C5
C6
C7
1
2
3
4
5
6
7
8
C1
C2
C3
C4
.
.
.
33pF
(DNI)
33pF
(DNI)
33pF
(DNI)
100nF
.
SIMIN
8
SIMVCC1 O Supply output for an
external UIM1 card
1.8V / 2.85V Power
10 SIMIO1 I/O Data connection with an
external UIM1 card
1.8V / 2.85V
12 SIMCLK1 O Clock output to an
external UIM1 card
1.8V / 2.85V
14 SIMRST1 O Reset output to an
external UIM1 card
1.8V / 2.85V
SIM Card Interface 2
13 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
7 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