Electrostatic Discharge Protection; Table 4 : Measured Electrostatic Values - Siemens TC35 Application

7

Electrostatic Discharge Protection

The GSM engine is not protected against Electrostatic Discharge (ESD) in general.
Consequently, it is subject to ESD handling precautions that typically apply to ESD sensitive
components.
However, the antenna port, the SIM interface, the Akku_Temp port, the POWER port and
the Battery lines on the GSM engine have with spark gaps and clamp diodes to protect these
lines from overvoltage.
The ESD protection of the GSM engine does not cover the components placed on the
customer application platform. For all these components, ESD protection must be
implemented on the platform that incorporates the GSM engine.

Table 4 : Measured electrostatic values

PIN No. Signal name
1 - 5 Batt+
6 - 10 GND
11 - 12 POWER
13 VDD
14 Akku_Temp
15 IGT
16 - 23 RS232 signals
24 - 29 SIM signals
30 VDDLP
31 PD
32 SYNC
33 - 40 Audio
Antenna HF signal
Antenna HF GND
GSM Engine TC35
TC35-AN-01-V00.04
Application Note
Contact discharge
(environment)
>4kV
>4kV
>4kV
>4kV
>4kV
>4kV
>4kV
>4kV
>4kV
>4kV
>4kV
>4kV
>4kV
>4kV
Released
7/9
Air discharge (direct
to TC35)
1.5kV
15kV
15kV
1.5kV
15kV
1.5kV
1.5kV
15kV
1.5kV
1.5kV
1.5kV
1.5kV
15kV
15kV
Application Note SIM Interface
Version 03.00