ADS1216 datasheet(16/28 Pages) TI

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ADS1216

SBAS171B

ACR (Address 02H) Analog Control Register

Reset Value = 00H

bit 7

BOCS: Burnout Current Source

0 = Disabled (default)

1 = Enabled

IDAC Current =

bit 6-5 IDAC2R1: IDAC2R0: Full-Scale Range Select for

IDAC2

00 = Off (default)

01 = Range 1

10 = Range 2

11 = Range 3

bit 4-3 IDAC1R1: IDAC1R0: Full-Scale Range Select for

IDAC1

00 = Off (default)

01 = Range 1

10 = Range 2

11 = Range 3

bit 2-0 PGA2: PGA1: PGA0: Programmable Gain Ampli-

fier

Gain Selection

000 = 1 (default)

001 = 2

010 = 4

011 = 8

100 = 16

101 = 32

110 = 64

111 = 128

IDAC1 (Address 03H) Current DAC 1

Reset Value = 00H

The DAC code bits set the output of DAC1 from 0 to full-

scale. The value of the full-scale current is set by this Byte,

VREF, RDAC, and the DAC1 range bits in the ACR register.

IDAC2 (Address 04H) Current DAC 2

Reset Value = 00H

The DAC code bits set the output of DAC2 from 0 to full-

scale. The value of the full-scale current is set by this Byte,

VREF, RDAC, and the DAC2 range bits in the ACR register.

DETAILED REGISTER DEFINITIONS

SETUP (Address 00H) Setup Register

Reset Value = iii01110

bit 7-5 Factory Programmed Bits

bit 4

SPEED: Modulator Clock Speed

0 : fMOD = fOSC /128 (default)

1 : fMOD = fOSC /256

bit 3

REF EN: Internal Voltage Reference Enable

0 = Internal Voltage Reference Disabled

1 = Internal Voltage Reference Enabled (default)

bit 2

REF HI: Internal Reference Voltage Select

0 = Internal Reference Voltage = 1.25V

1 = Internal Reference Voltage = 2.5V (default)

bit 1

BUF EN: Buffer Enable

0 = Buffer Disabled

1 = Buffer Enabled (default)

bit 0

BIT ORDER: Set Order Bits are Transmitted

0 = Most Significant Bit Transmitted First (default)

1 = Least Significant Bit Transmitted First

Data is always shifted into the part most significant

bit first. Data is always shifted out of the part most

significant byte first. This configuration bit only

controls the bit order within the byte of data that is

shifted out.

MUX (Address 01H) Multiplexer Control Register

Reset Value = 01H

bit 7-4 PSEL3: PSEL2: PSEL1: PSEL0: Positive Channel

Select

0000 = AIN0 (default)

0001 = AIN1

0010 = AIN2

0011 = AIN3

0100 = AIN4

0101 = AIN5

0110 = AIN6

0111 = AIN7

1xxx = AINCOM (except when all bits are 1’s)

1111 = Temperature Sensor Diode Anode

bit 3-0 NSEL3: NSEL2: NSEL1: NSEL0: Negative Chan-

nel Select

0000 = AIN0

0001 = AIN1 (default)

0010 = AIN2

0011 = AIN3

0100 = AIN4

0101 = AIN5

0110 = AIN6

0111 = AIN7

1xxx = AINCOM (except when all bits are 1’s)

1111 = Temperature Sensor Diode Cathode Analog GND

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

SPEED

REF EN

REF HI

BUF EN BIT ORDER

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

PSEL3

PSEL2

PSEL1

PSEL0

NSEL3

NSEL2

NSEL1

NSEL0

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

BOCS

IDAC2R1 IDAC2R0 IDAC1R1

IDAC1R0

PGA2

PGA1

PGA0

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

IDAC1_7

IDAC1_6

IDAC1_5 IDAC1_4

IDAC1_3 IDAC1_2

IDAC1_1

IDAC1_0

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

IDAC2_7

IDAC2_6

IDAC2_5 IDAC2_4

IDAC1_3 IDAC1_2

IDAC1_1

IDAC1_0

DAC Code

REF

DAC

RANGE

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