GSM9000 RF Solutions, GSM9000 Datasheet - Page 25

• 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
5.1 About This Chapter
5.2 Powering on/off GTM900
5.2.1 Powering UP GTM900
5.2.2 Powering Down GTM900
I. Powering down GTM900 normally
This chapter presents the operating process of GTM900 from the following aspects:
When the power supply to GTM900 is higher than 3.3 V and the PWON signal is low
level, GTM900 operates as illustrated in Figure 5-1.
Figure 5-1 Relationship between VDD and PWON signal
GTM900 might be powered down in the two cases below:
During normal powering down of GTM900, the external CPU lowers the level of PWON
signal level for 2 to 3 seconds to put GTM900 into normal powering down procedure. In
this case, GTM900 can save relevant information and completes network
deregistration.
VBATT+
PWON
VDD
Powering on/off GTM900
Software Upgrade of GTM900
Data Services
Services Presentation Diagram of GTM900
Chapter 5 Operating Process
3.3 V
Huawei Technologies Proprietary
2.8 V
4.0 V
5-1
Chapter 5 Operating Process