900844 Datasheet, PDF (93/118 Pages) Freescale Semiconductor, Inc – Integrated Power Management IC for Ultra-mobile and Embedded Applications

FUNCTIONAL DEVICE OPERATION
ADC SUBSYSTEM
Table 60. PMIC Die Temperature Voltage Reading
Parameter
Typical
Die Temperature Read Out Code at 25 °C
Temperature change per LSB
Customer Defined LSB Value
Multiplier Value for Output Register
1011000001
+0.4244 °C
1.0000 °C
x2.36
CURRENT SENSING
The load current sourced by a select set of regulators can be measured and recorded by the ADC on channels 1 through 5.
Table 61 shows a summary of these regulators, type, and their current ranges.
Table 61. Regulators Current Sensing
Regulator
Type
Current Range
VCC
Buck
0 – 3.5 A
VNN
VCC180
Buck
LDO
0 – 1.6 A
0 – 0.39 A
INPUT VOLTAGE
The input voltage is read at the VBAT pin at channel 6. The input voltage is first scaled by subtracting 2.40 V in order to fit the
input range of the ADC.
Table 62. Battery Voltage Reading Coding
Conversion Code Voltage at ADC input Voltage at VBAT
1 111 111 111
2.400 V
4.800 V
1 000 010 100
1.250 V
2.500 V
0 000 000 000
0.000 V
0.000 V
GENERAL PURPOSE ANALOG INPUTS
There are twelve general purpose analog input channels that can be measured through the ADIN10-ADIN21 pins. Two voltage
scaling (gain) settings can be selected to accommodate a wider range of inputs through the ADCCNTL3 and ADCCNTL4
registers. A gain of 0 sets a corresponding scaling factor of 1 (for an input range of 2.0 V) and a gain of 1 sets a corresponding
scaling factor of 10 (for an input range of 200 mV).
Table 63. General Purpose Analog Inputs Reading Coding
Conversion Code Voltage at ADC input Voltage at ADINx Input GAIN
1 111 111 111
2.400
0.200
1
1 011 111 111
1.800
0.150
0 011 111 111
0.600
0.050
0 000 000 000
0.000
0.000
1 111 111 111
2.400
2.000
0
1 011 111 111
0 011 111 111
1.800
0.600
1.500
0.500
0 000 000 000
0.000
0.000
Analog Integrated Circuit Device Data
Freescale Semiconductor
900844
93