AMC7812SPAPR Datasheet, PDF (71/92 Pages) Texas Instruments – 12-Bit Analog Monitoring and Control Solution with Multichannel ADC, DACs, and Temperature Sensors

AMC7812
www.ti.com
SBAS513E – JANUARY 2011 – REVISED SEPTEMBER 2013
ADC CHANNEL REGISTER 0 (Read/Write, Address = 50h, Default = 0000h)
MSB
BIT 15 BIT 14 BIT 13
0
SE0 SE1
BIT 12
DF
(CH0+/
CH1–)
BIT 11 BIT 10
SE2 SE3
BIT 9
DF
(CH2+/
CH3–)
BIT 8
SE4
BIT 7
SE5
BIT 6
SE6
BIT 5
SE7
BIT 4
SE8
BIT 3
SE9
BIT 2
SE10
BIT 1
SE11
LSB
BIT 0
SE12
These bits specify the external analog auxiliary input channels (CH0 to CH12) to be converted. The specified
channel(s) is accessed sequentially in order from bit 14 to bit 0. The input is converted when the corresponding
bit is set ('1').
Bit 15
Bits 14, 13, 11, 10, 8:0
Bit 12
Bit 9
Reserved. Writing to this bit causes no change. Reading this bit returns '0'.
SE0 to SE12. External single-ended analog input for CHn. The result is stored in ADC-n-Data Register in
straight binary format.
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.
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.
BIT 14
1
1
0
0
0
BIT 13
1
0
1
0
0
Table 23. CH0 and CH1 Bit Settings
BIT 12
0
0
0
1
0
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.
BIT 11
1
1
0
0
0
BIT 10
1
0
1
0
0
Table 24. CH2 and CH3 Bit Settings
BIT 9
0
0
0
1
0
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.
BIT 8
1
—
—
—
—
—
—
—
—
BIT 7
—
1
—
—
—
—
—
—
—
BIT 6
—
—
1
—
—
—
—
—
—
BIT 5
—
—
—
1
—
—
—
—
—
Table 25. CH4 to CH12 Bit Settings
BIT 4
—
—
—
—
1
—
—
—
—
BIT 3
—
—
—
—
—
1
—
—
—
BIT 2
—
—
—
—
—
—
1
—
—
BIT 1
—
—
—
—
—
—
—
1
—
BIT 0
—
—
—
—
—
—
—
—
1
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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