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Measurement of Battery and Ambient Temperature
The temperature is measured as a voltage equivalent of the temperature on the
voltage dividers
R131,R136,R135
for the ambient temperature by the EGAIM.
The battery temperature is measured directly at (l3) of the EGOLD+. 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+
activates the
(GSM TDMA-TIMER G11)
measurement and is used to generate to
BREF
by the help of
R137,R132
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 R118,
R120
to the EGOLD+
(Input limitation 1.33V to 5.91V) .An analog multiplexer does the
(GAIM N2)
switching between the baseband signal processing and the voltage
measurement.
V1.0
Page 33 of 46
ICM MP CCQ ST
C45, M50 AND MT50
Company Confidential © Copyright Siemens AG
05/02

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