Siemens S55 Repair Documentation page 35

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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.

V1.00

Page 35 of 49

ICM MP CCQ GRM

S55/S57

12/02

Table of Contents

S57