User's Manual

MC55/56 Hardware Interface Description
Confidential / Preliminary
s
MC55/56_hd_v03.00 Page 80 of 104 16.08.2005
5.4.1 Current consumption during transmit burst
The diagrams provided in Figure 35 and Figure 36 illustrate the typical current consumption
of the application caused during a transmit burst. The typical peak current is shown vs. the
power control level for 900 MHz, 1800 MHz and 1900 MHz and vs. the return loss of the
antenna.
Test conditions: All measurements have been performed at T
amb
= 25°C, V
BATT+ nom
= 4.1V.
Reference points for measuring the voltage are the BATT+ and GND test points on the back
side of the module. The curves are for one TX slot (for example a voice call, CSD call or
Class 8 GPRS). Curves for Class 10 GPRS activities (2 TX slots) are shown too.
Changing the conditions, e.g. in terms of temperature or voltage, will cause different results.
Average Current GSM900 (V
BATT+
=4.1V)
0.10
0.10
0.11
0.15
0.21
0.25
0.13
0.14
0.16
0.23
0.33
0.43
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
5 7 9 1113151719
Power Control Level
Current (Amps)
1 TX - Average Current
2 TX - Average Current