MC13783 Datasheet, PDF (40/50 Pages) Freescale Semiconductor, Inc – Power Management and Audio Circuit

Functional Description
4.4.2 ADC Subsystem
4.4.2.1 Converter Core
The ADC core is a 10 bit successive approximation converter.
4.4.2.2 Input Selector
The ADC has two groups of 8 input channels. ADSEL selects between two groups of input signals. If set
to zero then group 0 is read and stored, if set to 1 then group 1 is read and stored. This is done to shorten
the total read time and to reduce the required storage of converted values. The table below gives an
overview of the attribution of the A to D channels.
Table 23. ADC Inputs
Channel
Signal read
Expected Input Range Scaling Scaled Version
0 Battery Voltage (BATT)
2.50 – 4.65 V
1 Battery Current (BATT – BATTISNS)
-50 - +50 mV
2 Application Supply (BP)
2.50 – 4.65 V
3 Charger Voltage (CHRGRAW)
0 – 10 V /
0 – 20 V
4 Charger Current (CHRGISNSP-CHRGISNSN)
-250mV – +250 mV
5 General Purpose ADIN5 / Battery Pack Thermistor
0 – 2.30 V
6 General Purpose ADIN6 / Backup Voltage (LICELL)
0 – 2.30 V /
1.50 – 3.50 V
7 General Purpose ADIN7 / UID / Die Temperature
0 – 2.30 V /
0 – 2.55 V / TBD
8 General Purpose ADIN8
0 - 2.30 V
9 General Purpose ADIN9
0 - 2.30 V
10 General Purpose ADIN10
0 - 2.30 V
11 General Purpose ADIN11
0 - 2.30 V
12 General Purpose TSX1 / Touchscreen X-plate 1
0 - 2.30 V
13 General Purpose TSX2 / Touchscreen X-plate 2
0 - 2.30 V
14 General Purpose TSY1 /
Touchscreen Y-plate 1
0 - 2.30 V
15 General Purpose TSY2 /
Touchscreen Y-plate 2
0 - 2.30 V
- 2.40 V
x20
- 2.40 V
/5
/10
X4
No
No /
- 1.20 V
No /
x0.9 / No
No
No
No
No
No
No
No
0.10 – 2.25 V
-1.00 - +1.00 V
0.10 – 2.25 V
0 – 2.00 V
0 – 2.00 V
-1.00 – 1.00 V
0 – 2.30 V
0 – 2.30 V
0.30 – 2.30 V
0 – 2.30 V
0 – 2.30 V
0 – 2.30 V
0 – 2.30 V
0 – 2.30 V
0 – 2.30 V
0 – 2.30 V
0 – 2.30 V
No
0 – 2.30 V
4.4.2.3 Control
The ADC parameters are programmed by the processors via SPI. Locally on MC13783, the different ADC
requests are arbitrated and executed. When a conversion is finished, an interrupt is generated to the
processor which started the conversion.
MC13783 Technical Data, Rev. 3.4
40
Freescale Semiconductor