Commit | Line | Data |
---|---|---|
93ee0a75 LF |
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 |