User's Manual
Table Of Contents
- Contents
- Figures
- Tables
- Document history
- Introduction
- Product concept
- GSM application interface
- GSM/GPRS operating modes
- Power supply
- Power up / down scenarios
- Automatic GPRS Multislot Class change
- Charging control of the GSM part
- Power saving
- Summary of state transitions (except SLEEP mode)
- RTC backup for GSM part of XT55/56
- Serial interfaces of the XT55/56 GSM part
- Audio interfaces
- SIM interface
- Control signals
- GPS application interface
- GSM and GPS antenna interfaces
- Electrical, reliability and radio characteristics
- Mechanics
- Reference approval
- Example applications
- List of parts and accessories
XT55/56 Hardware Interface Description
Confidential / Released
s
XT55/56_hd_v02.06a Page 34 of 125 17.12.2004
If the charger is connected to the GSM_POWER line when GSM part of the XT55/56 is in
ALARM mode charging will start, while XT55/56 stays in ALARM mode. See also Chapter 3.7
which summarizes the various options of changing the mode of operation.
If your host application uses the GSM_SYNC pin to control a status LED as described in
Chapter 3.12.2.2, please note that the LED is off while the GSM engine is in Alarm mode.