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
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XT55/56_hd_v02.96 Page 100 of 125 18.08.2005
Burst Current GSM900 (V
BATT+
=4.1V)
0.3
0.4
0.68
1.24
1.6
0.28
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
5 7 9 1113151719
Power Control Level
Current (Amps)
1 TX - Peak current
Figure 44: Peak current consumption during transmit burst in EGSM 900 network
Burst Current DCS1800 (V
BATT+
=4.1V)
0.27
0.38
0.24
0.84
0.52
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Power Control Level
Current (Amps)
1 TX - Peak current
Figure 45: Peak current consumption during transmit burst in GSM 1800 network