AD7151

Rev. 0 | Page 15 of 28

STATUS REGISTER

Address Pointer 0x00

8 Bits, Read-Only, Default Value 0x53 Before Conversion, 0x52 After Conversion

The status register indicates the status of the part. The register can be read via the 2-wire serial interface to query the status of the outputs,

check the CDC finished conversion, and check whether the CAPDAC has been changed by the autoCAPDAC function.

Table 6. Status Register Bit Map

Bit

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Mnemonic

PwrDown

–

–

DacStep

OUT

–

–

RDY

Default

0

1

0

1

0

0

1

1

Table 7. Status Register Bit Descriptions

Bit

Mnemonic

Description

7

PwrDown

monitor threshold voltage.

6

–

Bit not used, always reads 1.

5

–

Bit not used, always reads 0.

4

DacStep

DacStep = 0 indicates that the CAPDAC value was changed during the last conversion as part of the AutoDac

function. The bit value is updated after each finished CDC conversion.

3

OUT

OUT = 1 indicates that the data (CIN capacitance) crossed the threshold, according to the selected comparator

mode of operation. The bit value is updated after each finished CDC conversion.

2

–

Bit not used, always reads 0.

1

–

Bit not used, always reads 1.

0

RDY

RDY = 0 indicates a finished CDC conversion. The bit is reset back to 1 when the data register is read via the

serial interface or after the part reset or power-up.