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 88 of 125 17.12.2004
supply voltage and operating temperature: To achieve T
amb max
= 70°C and, for example, GSM
900 PCL 5 the supply voltage must not be higher than 4.2V.
***)
To achive T
amb max
= 70°C at permanent GPRS class 8 operation (1 TX, 4 RX GSM 900 at
PCL 5 with a supply voltage 4.2V) it is recommended to integrate XT55/56 in such a way that a
minor heat exchange with the environment can take place. A solution might be the usage of a
small heat sink.