LG U8290 Service Manual page 49

3. TECHNICAL BRIEF
3.10.2.4 HKADC(House Keeping ADC)
The MSM6250 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 MSM6250 device has six analog input pins which are multiplexed to the input of the
internal HKADC.
Ch Signal
HKADC0 AMUX_OUT
HKADC1 VBATT_LEVEL
HKADC2 HDET1
HKADC3 MULTI_ADC
HKADC4 VBATT_SENSE
TCXO (default)
USB_XTAL
MUX_SEL_IN
3
HKADC0
000
HKADC1 001
010
HKADC2
011
HKADC3
HKADC4 100
HKADC5 101
110
GSM_PA_PWR_REF
111
1.826 V
Vref
1.217 V
Gen
0.609 V
Vext
Figure 3.10.2.4-1 MSM6250 HKADC Block diagram
Note
RF PAM Temperature
Battery voltage level
RF PAM Power Level
Ear Remote control Key Detection
Battery Detection
Table 3.10.2.4-1 HKADC channel table
- 50 -
HKADC_CLK_SRC_SEL
0
1
MSM
HKADC_CLK_DIV_SEL
DIV / N
2
2
DIV/M HKADC_SETUP [6:5]
HKADC CLK
8
Vin Dout HKADC_DATA [7:0]
8-bit
ADC
HKADC_STATUS [0]
EOC
Vref
000
001
010
011
VDD_A 1xx
3
VREF_SEL
03-073