Datasheet

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