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Data Sheet

ADIS16575/ADIS16576/ADIS16577

USER REGISTER DEFINITIONS

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STATUS AND ERROR FLAG INDICATORS

(DIAG_STAT)

Table 14. DIAG_STAT Register Definition

Addresses

Default

Access

Flash Backup

0x02, 0x03

0x0000

The DIAG_STAT register is unique in that it triggers the following

special processing when read:

1. Any read of the DIAG_STAT register clears the DIAG_STAT

2. Any read of the DIAG_STAT register when in FIFO mode

(FIFO_CTRL, Bit 0 = 1) triggers a FIFO pop, loading a single

sample from the FIFO to the output registers, which includes

reading the DIAG_STAT register through the burst read func-

tion.

In addition, the DIAG_STAT register updates asynchronously be-

cause fault conditions are detected. Other volatile registers update

during the DR invalid period only.

Table 15. DIAG_STAT Bit Descriptions

Bit

Description

Microcontroller Fault. A 1 indicates that a fault occurred in the

microcontroller. In response to this fault, the system issues a software

reset. Upon the subsequent power-up, the system sets this bit.

Not Used.

Z-Axis Accelerometer Failure. 1 = error condition. This flag can

be set by the on-demand self test command or by the continuous

consistency checker.

Y-Axis Accelerometer Failure. 1 = error condition. This flag can

be set by the on-demand self test command or by the continuous

consistency checker.

X-Axis Accelerometer Failure. 1 = error condition. This flag can

be set by the on-demand self test command or by the continuous

consistency checker.

Z-Axis Gyroscope Failure. 1 = error condition. This flag can be set

by the on-demand self test command or by the continuous gyroscope

status monitor

Y-Axis Gyroscope Failure. 1 = error condition. This flag can be set

by the on-demand self test command or by the continuous gyroscope

status monitor.

X-Axis Gyroscope Failure. 1 = error condition. This flag can be set

by the on-demand self test command or by the continuous gyroscope

status monitor.

Scaled Sync Unlock Flag. A 1 indicates that the scaled sync, digital

phased-lock loop (DPLL) controller is unlocked. This diagnostic is

only active when the IMU is configured to operate in scaled sync

mode.

Memory Error (Corrupted Factory Data Failure). A 1 indicates a

memory error due to corrupted factory register data in either the

flash memory or SRAM or a corrupted factory program detected

during the flash memory test (initiated by Register GLOB_CMD, Bit 4,

see Table 128). This failure is identified through a CRC comparison

between the current data in memory and the data from the time

of initial programming during production. If this error occurs, it is

Table 15. DIAG_STAT Bit Descriptions (Continued)

Bit

Description

recommended to repeat the test. If the error persists, the ADIS16575/

ADIS16576/ADIS16577 may need to be replaced.

Self-Test Diagnostics Failure. A 1 indicates that the sensor, self

test routine failed. The specific failed sensor can be determined by

reading the six self test result bits. Continuous monitoring of the

sensors, which does not involve an applied stimulus, does not set this

flag.

Power Supply Monitor. A 1 indicates that the voltage across VDD and

GND is <2.9 V, which causes data processing to stop. When VDD ≥

2.9 V for 250 ms, the ADIS16575/ADIS16576/ADIS16577 reinitialize

and start producing data again.

SPI Communication Error. A 1 indicates that the total number of

SCLK cycles is not 16. This error can detect issues such as being

off by a single bit. When this error occurs, repeat the previous

communication sequence. Persistence in this error may indicate

a weakness in the SPI service that the ADIS16575/ADIS16576/

ADIS16577 is receiving from the system it is supporting.

Flash Memory Update Failure. A 1 indicates that the most recent flash

memory update (Register GLOB_CMD, Bit 3, see Table 128) failed.

If this error occurs, ensure that VDD ≥ 3 V and repeat the update

attempt. If this error persists, replace the ADIS16575/ADIS16576/

ADIS16577.

Datapath Processing Overrun. A 1 indicates that one of the datapaths

experienced an overrun condition, which can occur due to excessive

SPI traffic, or if the sample clock rate is too high. If this error occurs,

reduce the SPI traffic, or adjust the sample clock rate, to prevent

future overruns. Note that a reset is not necessary for recovery. For

more details on conditions that may cause this bit to be set to 1, see

the SPI Operation section.

Sensor Initialization Failure. A 1 indicates that the inertial sensors

failed to initialize properly. When this failure occurs, the sensors shut

down, and the IMU is placed into safe mode. Upon the subsequent

power-up, if this error persists, replace the ADIS16575/ADIS16576/

ADIS16577.

The DIAG_STAT register (see Table 14 and Table 15) provides

error flags for monitoring the integrity and operation of the

ADIS16575/ADIS16576/ADIS16577. Reading this register causes

all of the bits to return to 0. The error flags in STATUS are sticky,

meaning that when the flags rise to 1, these flags remain there until

a read request clears them. If an error condition persists, the flag

(bit) automatically returns to a value of 1.

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