Specifications

XT55 Hardware Interface Description
Confidential / Preliminary
s
mo b i l e
XT55_hd_v00.02 Page 94 of 116 17.03.2004
6.5 Current consumption during GSM/GPRS transmit burst
The diagrams provided in Figure 48 and Figure 49 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
GSM_BATT+ nom
=
4.1V. Reference points for measuring the voltage are the GSM_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 11 13 15 17 19
Power Control Level
Current (Amps)
1 TX - Average Current
2 TX - Average Current
Figure 43: Typical current consumption vs. return loss in EGSM 900 network