ADIS16IMU2SLASHPCBZ datasheet(15/23 Pages) AD

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Data Sheet

ADIS16446

Rev. 0 | Page 15 of 23

STATUS AND ERROR FLAGS

The DIAG_STAT register in Table 25 provides error flags for

a number of functions. Each flag uses 1 to indicate an error

condition and 0 to indicate a normal condition. Reading this

all of the bits to 0 for monitoring future operation. If the error

condition remains, the error flag returns to 1 at the conclusion

of the next sample cycle. The SPI communication error flag in

DIAG_STAT, Bit 3 indicates that the number of SCLKs in a SPI

sequence did not equal a multiple of 16 SCLKs.

Table 25. DIAG_STAT (Base Address = 0x3C), Read Only

Bits

Description (Default = 0x0000)

Z-axis accelerometer self test failure

1 = fail, 0 = pass

Y-axis accelerometer self test failure

1 = fail, 0 = pass

X-axis accelerometer self test failure

1 = fail, 0 = pass

Z-axis gyroscope self test failure

0 = pass

Y-axis gyroscope self test failure

1 = fail, 0 = pass

X-axis gyroscope self test failure

1 = fail, 0 = pass

Alarm 2 status

1 = active, 0 = inactive

Alarm 1 status

1 = active, 0 = inactive

Unused

Flash test, checksum flag

1 = fail, 0 = pass

Self test diagnostic error flag

1 = fail, 0 = pass

Sensor overrange

1 = overrange, 0 = normal

SPI communication failure

1 = fail, 0 = pass

Flash update failure

1 = fail, 0 = pass

Unused

Memory Management

The FLASH_CNT register in Table 26 provides a 16-bit counter

that helps track the number of write cycles to the nonvolatile flash

memory. The flash updates every time a manual flash update

occurs. A manual flash update is initiated by GLOB_CMD, Bit 3

and is performed at the completion of the GLOB_CMD, Bits[1:0]

functions (see Table 19).

Table 26. FLASH_CNT (Base Address = 0x00), Read Only

Bits

Description

[15:0]

Binary counter

Checksum Test

Set MSC_CTRL, Bit 11 = 1 (DIN = 0xB508) to perform a

checksum test of the internal program memory. This function

takes a summation of the internal program memory and

compares it with the original summation value for the same

locations (from factory configuration). If the sum matches the

correct value, DIAG_STAT, Bit 6 is equal to 0. If it does not

match, DIAG_STAT, Bit 6 is equal to 1. Make sure that the

power supply is within specification for the entire 20 ms that

this function takes to complete.

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