AD4134 datasheet(70/92 Pages) AD

70 / 92 page

Data Sheet

AD4134

DIAGNOSTICS

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Rev. 0 | 70 of 92

The AD4134 has numerous diagnostic functions on chip that moni-

tor and report errors for the following functional blocks:

►

Internal fuses

►

Analog input range

►

MCLK frequency

►

SPI communication

►

Memory map value

►

ODR input frequency

►

Digital filters

In SPI control mode, the user can enable or disable the following

diagnostic features through the diagnostic control register:

►

Fuse CRC

►

Memory map CRC

►

SPI CRC

►

MCLK counter

►

Analog input range

Figure 123 shows all the different types of blocks monitored, as well

as blocks that are enabled using the diagnostic control register.

The remaining diagnostic features run continuously on the device

and all the bits except the NO_CHIP_ERR bit are cleared on a

read.

As shown in Figure 123, the NO_CHIP_ERR bit in the device

configuration register is the master error status bit. This bit is

cleared if any of the other status error bits are set. This bit sets

back to 1 when all the status bits are cleared, indicating no chip

error.

INTERNAL FUSE INTEGRITY CHECK

The AD4134 uses a fuse type memory to store the factory pro-

grammed calibration values that are unique to each device. When

leaving the factory, a CRC code is calculated based on the final

fuse values of the device and is stored in the device memory.

On each power-up, the device reads the fuse memory for self

configuration. The device also performs a CRC calculation based

on the fuse values read and compares the calculation against the

factory programmed value to detect a fuse reading error.

The device sets the ERR_FUSE_CRC bit if a fuse CRC error is

detected.

The user can also initiate a fuse check by using the FUSE_

CRC_CHECK bit in the diagnostic control register. This bit is

cleared when the check is complete. When this check is executed,

the data output is interrupted.

The fuse CRC supports 1-bit error correction. The device tries

to correct the error when detected. The AD4134 sets the

STAT_FUSE_ECC bit if the error is corrected and sets the

ERR_FUSE_CRC bit if the fuse CRC error correction is not com-

pleted.

Figure 123. Errors

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