Data Sheet

AD7150

Rev. A | Page 15 of 28

STATUS REGISTER

Address Pointer 0x00

8 Bits, Read-Only, Default Value 0x53 Before Conversion, 0x54 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

DacStep2

OUT2

DacStep1

OUT1

C1/C2

RDY2

RDY1

Default

0

1

0

1

0

0

1

1

Table 7. Status Register Bit Descriptions

Bit

Mnemonic

Description

7

PwrDown

PwrDown = 1 indicates that the part is in a power-down mode or that the part VDD is below the power supply

monitor threshold voltage.

6

DacStep2

DacStep2 = 0 indicates that the Ch2 CAPDAC value was changed after the last CDC conversion as part of the

AutoDac function. The bit value is updated after each finished CDC conversion on this channel.

5

OUT2

OUT2 = 1 indicates that the Ch2 data (CIN2 capacitance) crossed the threshold, according to the selected

comparator mode of operation. The bit value is updated after each finished CDC conversion on this channel.

4

DacStep1

DacStep1 = 0 indicates that the Ch1 CAPDAC value was changed during the last conversion as part of the

AutoDac function. The bit value is updated after each finished CDC conversion on this channel.

3

OUT1

OUT1 = 1 indicates that the Ch1 data (CIN1 capacitance) crossed the threshold, according to the selected

comparator mode of operation. The bit value is updated after each finished CDC conversion on this channel.

2

C1/C2

The C1/C2 = 0 indicates that the last finished CDC conversion was on Channel 1.

The C1/C2 = 1 indicates that the last finished CDC conversion was on Channel 2.

1

RDY2

RDY2 = 0 indicates a finished CDC conversion on Ch2. The bit is reset back to 1 when the Ch2 data register is

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

0

RDY1

RDY1= 0 indicates a finished CDC conversion on Ch1. The bit is reset back to 1 when the Ch1 data register is

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