900844 Datasheet, PDF (89/118 Pages) Freescale Semiconductor, Inc – Integrated Power Management IC for Ultra-mobile and Embedded Applications

FUNCTIONAL DEVICE OPERATION
ADC SUBSYSTEM
The ADC will be used for sensing the current through select voltage regulators, touch screen support, PMIC thermal sensor,
battery voltage, current, and temperature.
Figure 49 is a representation of the ADC block.
Figure 49. ADC Block Representation
INPUT SELECTOR
The ADC has 22 input channels selected through the ADSEL[4:0] bits in the ADCADDRx register. Table 57 gives an overview
of the characteristics of each of these channels.
Table 57. ADC Inputs
Channel SELECT[4:0]
0
00000
1
00001
2
00010
3
00011
4
00100
5
00101
6
00110
7
00111
ADC Input Signal
PMIC Die Temperature
VCC Current Sense
VNN Current Sense
VCC180 Current Sense
Reserved
Reserved
Input voltage (V_BAT)
Reserved
Input Level
1.2 – 2.4 V
0 – 2.4 V
0 – 2.4 V
0 – 2.4 V
Reserved
Reserved
0 – 4.8 V
Reserved
Scaling
x1
x1
x1
x1
Reserved
Reserved
/2
Reserved
Scaled Version
1.2 – 2.4 V
0 – 2.4 V
0 – 2.4 V
0 – 2.4 V
Reserved
Reserved
0 – 2.4 V
Reserved
Analog Integrated Circuit Device Data
Freescale Semiconductor
900844
89