User Manual
Table Of Contents
- 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 / Preliminary
s
XT55/56_hd_v02.96 Page 102 of 125 18.08.2005
0
200
400
600
800
1000
1200
1400
1600
Burst (max) Burst (min) Average Current (Max) Average Current (Min)
Current (mA)
ch.124 PCL5
Service mode GSM900 ch.124
V
ariations in current with 0.4dB return
loss (all phases)
0
100
200
300
400
500
600
700
800
900
1000
Burst (max) Burst (min) Average Current (Max) Average Current (Min)
Current (mA)
ch.661 PCL0
Service mode PCS1900 ch.661
V
ariations in current with 0.6dB return
loss (all phases)
Test conditions: T
amb
= 25°C, V
GSM_BATT+ nom
= 4.1V measured at TP GSM_BATT+ and GND, 1 TX slot
Figure 47: Typical current consumption vs. return loss