User's Manual

WM_PRJ_Q2400_PTS_002 - 004
March 5, 2004
2.19 VCC output
This output can be used to power some external functions. VCC has to be used as a digital power
supply. This power supply is available when the module is ON.
Pin description
Signal Pin number I/O I/O type Description
VCC 40 O Supply Digital supply
Operating conditions
Parameter Condition Min Max Unit
Output voltage
I = 10 mA 2.74 2.86 V
Output Current
10 mA
2.20 Real Time Clock Supply (VCC_RTC)
VCC_RTC input is used to provide a back-up power supply for the internal Real Time Clock. The
RTC is supported by the module when powered on but a back-up power supply is needed to save
date and time information when the module is switched off.
If the RTC is not used this pin can be left open.
Pin description
Signal Pin number I/O I/O type Description
VCC_RTC 56 I/O Supply RTC Back-up supply
Operating conditions
Parameter Condition Min Max Unit
Input voltage 2 2.75 V
Input Current VCC=0 V; t° = +25 °C
VCC_RTC=2.5 V
3 µA
Input Current VCC=0 V; t°:-20 °C / +55 °C
VCC_RTC=2.5 V
10 µA
Output voltage 2.4 2.75 V
Output current 2 mA
2.21 RF interface
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autorisation préalable.
The impedance is 50 Ohms nominal and the DC impedance is 0 Ohm.