User's Manual

Note d‘étude / Technical document :

URD1– OTL 5696.1– 003 / 72361 Edition 02

HILO 3G Application Note

17 January 2011 - Page 9 / 38

3.1. How to connect a SIM card

Figure 4: SIM Card signals

The HiLo3G module provides SIM signals to the 40 pins. A SIM card holder with 6 pins must be adopted to use the SIM

function.

Decoupling capacitors must be added on VSIM,SIM_DATA,SIM_RST,and SIM_CLK signals as close

as possible to the SIM card connector to avoid EMC issues and pass SIM card approval tests.

Use ESD protection components to protect SIM card and module I/Os against Electro Static Discharges.

The following schematic shows how to protect SIM access of a 6 pins connector. This must be performed every time a SIM

card holder is accessed by the end user customer.

Figure 5: EMC and ESD protection components close to SIM

PIN No.

Name

VCC

RST

CLK

GND

VPP

I/O

N/A

VSIM