Siemens SL55 - Page 35

Customer Care
V 1.0 Page 35of 52 ICM MP CCQ GRM
SL55
Company Confidential © Copyright Siemens AG
06/03
Measurement of, Battery Type and Battery/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 SD 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.