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1 | Kernel driver mc13783-adc | ||
2 | ========================= | ||
3 | |||
4 | Supported chips: | ||
5 | * Freescale Atlas MC13783 | ||
6 | Prefix: 'mc13783_adc' | ||
7 | Datasheet: http://www.freescale.com/files/rf_if/doc/data_sheet/MC13783.pdf?fsrch=1 | ||
8 | |||
9 | Authors: | ||
10 | Sascha Hauer <s.hauer@pengutronix.de> | ||
11 | Luotao Fu <l.fu@pengutronix.de> | ||
12 | |||
13 | Description | ||
14 | ----------- | ||
15 | |||
16 | The Freescale MC13783 is a Power Management and Audio Circuit. Among | ||
17 | other things it contains a 10-bit A/D converter. The converter has 16 | ||
18 | channels which can be used in different modes. | ||
19 | The A/D converter has a resolution of 2.25mV. Channels 0-4 have | ||
20 | a dedicated meaning with chip internal scaling applied. Channels 5-7 | ||
21 | can be used as general purpose inputs or alternatively in a dedicated | ||
22 | mode. Channels 12-15 are occupied by the touchscreen if it's active. | ||
23 | |||
24 | Currently the driver only supports channels 2 and 5-15 with no alternative | ||
25 | modes for channels 5-7. | ||
26 | |||
27 | See this table for the meaning of the different channels and their chip | ||
28 | internal scaling: | ||
29 | |||
30 | Channel Signal Input Range Scaling | ||
31 | ------------------------------------------------------------------------------- | ||
32 | 0 Battery Voltage (BATT) 2.50 - 4.65V -2.40V | ||
33 | 1 Battery Current (BATT - BATTISNS) -50 - 50 mV x20 | ||
34 | 2 Application Supply (BP) 2.50 - 4.65V -2.40V | ||
35 | 3 Charger Voltage (CHRGRAW) 0 - 10V / /5 | ||
36 | 0 - 20V /10 | ||
37 | 4 Charger Current (CHRGISNSP-CHRGISNSN) -0.25V - 0.25V x4 | ||
38 | 5 General Purpose ADIN5 / Battery Pack Thermistor 0 - 2.30V No | ||
39 | 6 General Purpose ADIN6 / Backup Voltage (LICELL) 0 - 2.30V / No / | ||
40 | 1.50 - 3.50V -1.20V | ||
41 | 7 General Purpose ADIN7 / UID / Die Temperature 0 - 2.30V / No / | ||
42 | 0 - 2.55V / x0.9 / No | ||
43 | 8 General Purpose ADIN8 0 - 2.30V No | ||
44 | 9 General Purpose ADIN9 0 - 2.30V No | ||
45 | 10 General Purpose ADIN10 0 - 2.30V No | ||
46 | 11 General Purpose ADIN11 0 - 2.30V No | ||
47 | 12 General Purpose TSX1 / Touchscreen X-plate 1 0 - 2.30V No | ||
48 | 13 General Purpose TSX2 / Touchscreen X-plate 2 0 - 2.30V No | ||
49 | 14 General Purpose TSY1 / Touchscreen Y-plate 1 0 - 2.30V No | ||
50 | 15 General Purpose TSY2 / Touchscreen Y-plate 2 0 - 2.30V No | ||