LG U990 Service Manual page 58

3.10.3 HKADC(House Keeping ADC)
The MSM6280 device has an on-chip 8-bit analog-to-digital converter (HKADC) which is tended to
digitize DC signals corresponding to analog parameters such as battery voltage, temperature, and RF
power levels. The MSM6280 device has six analog input pins which are multiplexed to the input of the
internal HKADC.
Channel
HKADC0
HKADC1
HKADC2
HKADC3
HKADC4
HKADC5
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Only for training and service purposes
Figure. MSM6280HKADC Block diagram
Signal
AMUX_OUT RF PAM Temperature Check
VBATT_SENSE Battery voltage level
REF_ADC ADC Reference voltage
TTY_ADC_DET Ear jack Detection for TTY
PCB_Rev_ADC PCB Version Check
Battery_THERM Battery Temperature Check
Table. HKADC channel table
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3. TECHNICAL BRIEF
Note
LGE Internal Use Only