ADA4255ACPZ-R7 datasheet(49/64 Pages) AD

49 / 64 page

Data Sheet

ADA4255

analog.com

Rev. 0 | 49 of 64

DIGITAL ERROR REGISTER (DIGITAL_ERR)

DETAILS

Table 16. DIGITAL_ERR Register Details (Register 0x03)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Bit Name

Reserved

CAL_BUSY

SPI_CRC_ERR

SPI_RW_ERR

SPI_SCLK_CNT_ERR

Reserved

MM_CRC_ERR

ROM_CRC_ERR

Access

Reserved

R/W

Reserved

R/W

Reset

Reserved

Bit 6, CAL_BUSY—Calibration Busy (Read

Only)

CAL_BUSY indicates that the PGIA is undergoing a calibration and

self trim operation. Until this flag is clear, the ADA4255 output

is not accurate. Writing a 1 or 0 to CAL_BUSY has no effect.

CAL_BUSY can be output on GPIO2 when GPIO2 is configured

as an output using the corresponding GPIO_DIR bit and when the

CAL_BUSY_OUT bit is set to 1.

Bit 5, SPI_CRC_ERR—SPI CRC Error

The SPI_CRC_ERR error flag indicates that an error occurred

during SPI communication with the ADA4255. This error occurs

when the user provided CRC does not match the ADA4255 CRC

calculation. Clear this error flag by writing a 1 to the SPI_CRC_ERR

bit.

Bit 4, SPI_RW_ERR—SPI Read/Write Error

The SPI_RW_ERR error flag indicates that a SPI read and/or write

operation is attempted on an invalid address. This error flag can be

cleared by writing a 1 to this bit.

Bit 3, SPI_SCLK_CNT_ERR—SPI SCLK Count

Error

The SPI_SCLK_CNT_ERR error flag indicates that, during SPI

communication while CS is low, the number of SCLK edges is

either insufficient or excessive. This error flag can be cleared by

writing a 1 to this bit.

Bit 1, MM_CRC_ERR—Memory Map CRC Error

The MM_CRC_ERR error flag indicates that the current internal

memory map does not match the result from the previous SPI write.

If this error occurs, it is recommended to reprogram the ADA4255

registers. This error flag can be cleared by writing a 1 to this bit.

Bit 0, ROM_CRC_ERR—ROM CRC Error

The ROM_CRC_ERR error flag indicates that the internal ROM

did not pass the CRC check. If this error occurs, it is strongly

recommended to reset or power cycle the device. If the error does

not reset with a power cycle or a soft reset, it is possible that the

device is permanently damaged.

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