AD7156

Rev. 0 | Page 15 of 28

REGISTER DESCRIPTIONS

Table 5. Register Summary1

Register

Addr Pointer

R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Dec

Hex

Status

0

0x00

R

PwrDown

DacStep2

OUT2

DacStep1

OUT1

C1/C2

RDY2

RDY1

(0)

(1)

(0)

(1)

(0)

(0)

(1)

(1)

Ch 1 Data High

1

0x01

R

0x00

Ch 1 Data Low

2

0x02

R

0x00

Ch 2 Data High

3

0x03

R

0x00

Ch 2 Data Low

4

0x04

R

0x00

Ch 1 Average High

5

0x05

R

0x00

Ch 1 Average Low

6

0x06

R

0x00

Ch 2 Average High

7

0x07

R

0x00

Ch 2 Average Low

8

0x08

R

0x00

Ch 1 Sensitivity/

Ch 1 Threshold High

9

0x09

R/W

Ch 1 sensitivity (in adaptive threshold mode)/Ch 1 threshold high byte (in fixed threshold mode)

0x08

Ch 1 Timeout/

Ch 1 Threshold Low

10

0x0A

R/W

Ch 1 timeout (in adaptive threshold mode)/CH 1threshold low byte (in fixed threshold mode)

0x86

Ch 1 Setup

11

0x0B

R/W

RngH1

RngL1

Hyst1

ThrSettling1 (4-bit value)

(0)

(0)

(0)

(0)

(0x0B)

Ch 2 Sensitivity/

Ch 2 Threshold High

12

0x0C

R/W

Ch 2 sensitivity (in adaptive threshold mode)/Ch 2 threshold high byte (in fixed threshold mode)

0x08

Ch 2 Timeout/

Ch 2 Threshold Low

13

0x0D

R/W

Ch 2 timeout (in adaptive threshold mode)/Ch 2 threshold low byte (in fixed threshold mode)

0x86

Ch 2 Setup

14

0x0E

R/W

RngH2

RngL2

Hyst2

ThrSettling2 (4-bit value)

(0)

(0)

(0)

(0)

(0x0B)

Configuration

15

0x0F

R/W

ThrFixed

ThrMD1

ThrMD0

EnCh1

EnCh2

MD2

MD1

MD0

(0)

(0)

(0)

(1)

(1)

(0)

(0)

(1)

Power-Down Timer

16

0x10

R/W

Power-down timeout (6-bit value)

(0)

(1)

(0x00)

Ch 1 CAPDAC

17

0x11

R/W

DacEn1

DacAuto1

DacValue1 (6-bit value)

(1)

(1)

(0x00)

Ch 2 CAPDAC

18

0x12

R/W

DacEn2

DacAuto2

DacValue2 (6-bit value)

(1)

(1)

(0x00)

Serial Number 3

19

0x13

R

Serial number—Byte 3 (MSB)

Serial Number 2

20

0x14

R

Serial number—Byte 2

Serial Number 1

21

0x15

R

Serial number—Byte 1

Serial Number 0

22

0x16

R

Serial number—Byte 0 (LSB)

Chip ID

23

0x17

R

Chip identification code