User's Manual

GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 49 of 68
When connection is not short, insertion of 10..100ohm resistor with 10..33pF capacitor
(RC filter) is a good caution to improve EMI from SIMCLK line.
Do not insert resistor on SIMVCC, SIMRST and SIMIO lines, their use is not supported by SIM
electrical interface.
3) ESD: take standard ESD caution if application based on TELIT module has
SIM holder with contacts reachable from human body.
4) SIM supply: do not connect capacitance greater than 10nF to SIMVCC line.
Other notes:
- SIMIN doesn't require any pull-up resistor. It is built in.
- SIM card is detected inserted when this line is short to ground.
Schematic Example: