V1.00 Page 35 of 49 ICM MP CCQ GRM
S55/S57 Company Confidential © Copyright Siemens AG 12/02
Measurement of Battery, Battery Type and Ambient Temperature
The voltage equivalent of the temperature and battery code on the voltage separator
will be calculated as the difference against a reference voltage of the EGOLD. For
this, the integrated Σ∆ converter in the EGOLD of the RX-I base band branch will be
used. Via an analogue multiplexer, either the RX-I base band signal, the battery code
voltage or the ambient temperature voltage can be switched over to the input of the
converter. The 1-Bit data stream of the converter will be subjected to a data reduction
via the DSP circuit so that the measured voltage (for battery and ambient
temperature) will be available at the end as a 10-bit data word.
Measurement of the Battery Voltage
Analogue to the I-branch either the RX-Q base band signal or the battery voltage can
be measured in the Q-branch. Processing in the DSP circuit will be done analogue to
the I-branch. The EGOLD will be specified internally at voltage measurement input
BATT+ for an input voltage of 3V...4.5V.
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