AMC7812B datasheet(72/92 Pages) TAOS

72 / 92 page

AMC7812B

SBAS625A – SEPTEMBER 2013 – REVISED SEPTEMBER 2013

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ADC Channel Register 0 (Read or Write, Address = 50h, Default = 0000h)

MSB

LSB

BIT 15 BIT 14 BIT 13

BIT 12

BIT 11 BIT 10

BIT 9

BIT 8

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

SE0

SE1

(CH0+,

SE2

SE3

(CH2+,

SE4

SE5

SE6

SE7

SE8

SE9

SE10

SE11

SE12

CH1–)

CH3–)

These bits specify the external analog auxiliary input channels (CH0 to CH12) to be converted. The specified

channels are accessed sequentially in order from bit 14 to bit 0. The input is converted when the corresponding

bit is set ('1').

Bit 15

Reserved

Writing to this bit causes no change. Reading this bit returns '0'.

Bits 14, 13, 11, 10, 8:0

SE0 to SE12

External single-ended analog input for CHn. The result is stored in ADC-n-data register in straight binary format.

Bit 12

DF (CH0+, CH1–)

External analog differential input pair, CH0 and CH1, with CH0 as positive and CH1 as negative. The difference

of (CH0 – CH1) is converted and the result is stored in the ADC-0-data register in twos complement format.

Bit 9

DF(CH2+, CH3-)

External analog differential input pair, CH2 and CH3, with CH2 as positive and CH3 as negative. The difference

of (CH2 – CH3) is converted and the result is stored in the ADC-2-data register in twos complement format.

Table 23. CH0 and CH1 Bit Settings

BIT 14

BIT 13

BIT 12

DESCRIPTION

CH0 and CH1 are both accessed as single-ended inputs. Bit 12 is ignored.

CH0 is accessed as a single-ended input. CH1 is not accessed. Bit 12 is ignored.

CH1 is accessed as a singled-ended. CH0 is not accessed. Bit 12 is ignored.

Differential input pair CH0 + and CH1– is accessed as a differential input.

CH0, CH1, and differential pair CH0+, CH1– are not accessed.

Table 24. CH2 and CH3 Bit Settings

BIT 11

BIT 10

BIT 9

DESCRIPTION

CH2 and CH3 are both accessed as single-ended inputs. Bit 9 is ignored.

CH2 is accessed as a single-ended input. CH3 is not accessed. Bit 9 is ignored.

CH3 is accessed as a singled-end input. CH2 is not accessed. Bit 9 is ignored.

Differential input pair CH2+ and CH3– is accessed as a differential input.

CH2, CH3, and differential pair CH2+, CH3– are not accessed.

Table 25. CH4 to CH12 Bit Settings

BIT 8

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

DESCRIPTION

—

CH4 is accessed as a single-ended input

—

CH5 is accessed as a single-ended input

—

CH6 is accessed as a single-ended input

—

CH7 is accessed as a single-ended input

—

CH8 is accessed as a single-ended input

—

CH9 is accessed as a single-ended input

—

CH10 is accessed as a single-ended input

—

CH11 is accessed as a single-ended input

—

CH12 is accessed as a single-ended input

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