GSM9000 RF Solutions, GSM9000 Datasheet - Page 21

• Manufacturer Part Number: GSM9000
• Description: Tri-band Wireless Module Supporting Both GSM And GPRS
• Manufacturer: RF Solutions

Specifications of GSM9000

• No. Of Channels: 2
• Frequency Rf: 1.8GHz
• Module Interface: Serial, UART
• Kit Contents: Module Board Docs
• Tool / Board Applications: Wireless Connectivity-ZigBee, RF, Infrared, USB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Product Description
Huawei GTM900 GSM/GPRS Wireless Module
4.3 SIM Interface
4.4 Audio Interface
For the output signals, GTM900 can be directly connected to an external drive device
operating at 3.3 V. If the input signals exceed the value range of GTM900, they must
undergo level alignment.
GTM900 can be connected to an external SIM card operating at 3.0 V. See Table 4-2
for the signals over the SIM interface.
Table 4-2 Signals over SIM interface
GTM900 supports two channels of audio input signals and audio output signals. The
two types of signals are both differential ones. In practice, you may use one channel or
both. See Figure 4-1 and Table 4-2 for the two channels of input signals and output
signals.
19
6
27
25
26
28
24
29
No.
UART_RXD
GND
Signal name
No.
Huawei Technologies Proprietary
SIM_CLK
SIM_RST
SIM_DATA
SIM_VCC
SIM_CD
SIM_GND
Receive data
GND
Signal name
Description
4-2
Clock signals over the SIM interface
Reset signals over the SIM interface
Data lines of the SIM card
Power supply to the SIM card
SIM card configured
SIM card grounded
DTE receives serial
data
--
Characteristic
Chapter 4 Interface Application
Description
DCE-DTE
--
Direction