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