SIM900D Hardware Design
5.5 Electro-Static Discharge
The GSM engine is not protected against Electrostatic Discharge (ESD) in general. Therefore, it is subject to ESD
handing precautions that typically apply to ESD sensitive components. Proper ESD handing and packaging
procedures must be applied throughout the processing, handing and operation of any application using a
SIM900D module.
The measured values of SIM900D are shown as the following table:
Table31: The ESD endure statue measured table (Temperature: 25
, Humidity:45% )
℃
Part
Contact discharge
Air discharge
VBAT
±5KV
±10KV
GND
±5KV
±10KV
RXD, TXD
±2KV
±8KV
ANT
±5KV
±10KV
SPK1P/1N
SPK2P/2N
MIC1P/1N
MIC2P/2N
±3KV
±8KV
PWRKEY
±2KV
±8KV
Other port
TBD
TBD
*
Note: The PWRKEY is recommended to use the ESD protection component.
SIM900D_HD_V1.02
09.04.2010
54
