MCP3910A1T-ESLASHML datasheet(73/86 Pages) MICROCHIP

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 2012-2014 Microchip Technology Inc.

DS20005116B-page 73

MCP3910

9.8

OFFCAL_CHn and GAINCAL_CHn

Registers - Digital Offset And Gain

Error Calibration Registers

Name

Bits

Address

Cof

OFFCAL_CH0

0x0F

R/W

GAINCAL_CH0

0x10

R/W

OFFCAL_CH1

0x11

R/W

GAINCAL_CH1

0x12

R/W

OFFCAL_CHn REGISTER

R/W-0

...

R/W-0

OFFCAL_CHn

<23>

OFF-

CAL_CHn<22>

OFF-

CAL_CHn<21>

...

OFF-

CAL_CHn<3>

OFF-

CAL_CHn<2>

OFF-

CAL_CHn<1>

OFF-

CAL_CHn<0>

bit 23

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 23-0

OFFCAL_CHn:

Digital Offset calibration value for the corresponding channel CHn. This register is

simply added to the output code of the channel bit-by-bit. This register is 24-bit two's complement MSB

first coding. CHn Output Code = OFFCAL_CHn + ADC CHn Output Code. This register is a Don't Care

if EN_OFFCAL = 0 (Offset calibration disabled), but its value is not cleared by the EN_OFFCAL bit.

GAINCAL_CHn REGISTER

R/W-0

...

R/W-0

GAIN-

CAL_CHn<23>

GAIN-

CAL_CHn<22>

GAIN-

CAL_CHn<21>

...

GAIN-

CAL_CHn<3>

GAIN-

CAL_CHn<2>

GAIN-

CAL_CHn<1>

GAIN-

CAL_CHn<0>

bit 23

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 23-0

GAINCAL_CHn:

Digital gain error calibration value for the corresponding channel CHn. This register

is 24-bit signed MSB first coding with a range of -1x to +0.9999999x (from 0x80000 to 0x7FFFFF). The

gain calibration adds 1x to this register and multiplies it to the output code of the channel bit-by-bit,

after offset calibration. The range of the gain calibration is thus from 0x to 1.9999999x (from 0x80000

to 0x7FFFFF). The LSB corresponds to a 2-23 increment in the multiplier.

CHn Output Code = (GAINCAL_CHn+1)*ADC CHn Output Code. This register is a Don't Care if

EN_GAINCAL = 0 (Gain calibration disabled) but its value is not cleared by the EN_GAINCAL bit.

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