LG KE990 Service Manual - Page 48

HKADCHouse Keeping ADC

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3. TECHNICAL BRIEF 3.9.3 HKADC(House Keeping ADC) The ESM6270 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 ESM6270 device has six analog input pins which are multiplexed to the input of the internal HKADC. Figure. ESM6270HKADC Block diagram Channel HKADC0 HKADC1 HKADC2 HKADC3 HKADC4 HKADC5 Signal AMUX_OUT VBATT_SENSE REF_ADC TTY_ADC_DET PCB_Rev_ADC Battery_THERM Note RF PAM Temperature Check Battery voltage level ADC Reference voltage Ear jack Detection for TTY PCB Version Check Battery Temperature Check Table. HKADC channel table Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 49 - LGE Internal Use Only

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3.9.3 HKADC(House Keeping ADC)
The ESM6270 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 ESM6270 device has six analog input pins which are multiplexed to the input of the
internal HKADC.
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
- 49 -
Figure. ESM6270HKADC Block diagram
Table. HKADC channel table
Channel
Signal
Note
HKADC0
AMUX_OUT
RF PAM Temperature Check
HKADC1
VBATT_SENSE
Battery voltage level
HKADC2
REF_ADC
ADC Reference voltage
HKADC3
TTY_ADC_DET
Ear jack Detection for TTY
HKADC4
PCB_Rev_ADC
PCB Version Check
HKADC5
Battery_THERM
Battery Temperature Check