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30 ADC-Values
30.1 What is ADC
The processor ca not use analogue information, therefore it has to be converted from analogue to
digital configuration.
The conversion is done in an 8-bits A/D converter. Fig. 30.1.
All of the analogue signals mentioned in the figure use the same ADC.
It is possible since there is an 8-channel multiplexer on the input of the A/D-converter.
The channels AM0 and AM1 are used for RSSI measuring and are explained in chapter
"Calibration RSSI"-fault.
The A/D-converted information is sent to the processor as serial data through RADDAT and
RADCLK.
30.2 How to check the ADC function
Some faults that are hard to detect in the functions of the phone are due to incorrect presentation
of information such as battery voltage or the temperature of the phone.
This can make the phone turn it self off even though the battery is fully charged or there is too
large frequency fault due to incorrect temperature compensation.
Such faults can be due to a fault in the A/D conversion.
You can use EFRA to read off the digital values on four of the ADC channels:
VTRACK, TEMP, BATTEMP and VLCDMEAS.
Start the phone in the test program and go to Logic\Read ADC.
4/00021-3/FEA 209 544/18 B
Fig. 30.1
Trouble Shooting Guide, Advanced
118(121)
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