V1.0 Page 30 of 38 ICM MP CC ST
A35-A36-A40 Company Confidential 09/01
a) Measurement of Battery and Ambient Temperature
The temperature is measured as a voltage equivalent of the temperature on the Notes
voltage dividers R115,R116,R117 for the battery temperature and R118,R119,
R120 for the ambient temperature from the EGAIM.
For this, the integrated Σ∆ converter of the EGAIM of the RX-I base band
branch is used. This Σ∆ converter compares the voltage of TBAT and TENV
internally with a reference voltage BREF.
Via an analog multiplexer, either the RX-I base band signal, or the TBAT signal
and the TENV signal can be switched to the input of the converter.
The signal MEAS_ON from the EGOLD+(GSM TDMA-TIMER G11) activates the
measurement and is used to generate to BREF by the help of R121,R122
b) Measurement of the Battery Voltage
The measurement of the battery voltage is done in the Q-branch of the EGAIM.
For this BATT+ is connected via a voltage divider R113, R114 to the EGOLD+
(GAIM N2) (Input limitation 1.33V to 5.91V) .An analog multiplexer does the
switching between the baseband signal processing and the voltage
measurement.
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