LG C1150 Service Manual page 31

3. TECHNICAL BRIEF
3.6.3 Auxiliary Section
1. This section includes an Automatic Frequency Control(AFC) DAC, voltage reference
buffers, an Auxiliary ADC, and light controllers.
2. This section also contains AUX ADC and Voltage Reference
• AFC DAC: 13 bits
• IDAC: 10 bits
• The Auxiliary ADC provides :
Two differential inputs for temperature sensing.
- A differential input for the battery charger current sensor
- A single-ended input for battery voltage measurement
- A single-ended input for battery type identification
- Two single-ended inputs for microphone and hookswitch detection, one for each of
two analog Audio input channels
- Two general purpose external inputs
- REF, REFOUT, REFCHG
- REFADC and REFADC/2, and AGND1 inputs for offset and gain measurement
AD6537B
CSFS
Control
CSDI
Serial
CSDO Port
AFC
DAC
REFTXCM
Voltage
Reference
Aux
ADC
Figure 3-14. AD6537B AUXILIARY SECTION
- 32 -
AFCDAC
REFBB
REFOUT
REFCHG
REF
TEMP1
TEMP2
AUXADC1
AUXADC2
AIN1P
AIN2P
BATTYPE
ISENSE
VBATSENSE
LIGHT1
Light LIGHT2
Controllers
LIGHT3