ADIS16445SLASHPCBZ datasheet(15/22 Pages) AD

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Data Sheet

ADIS16445

Rev. F | Page 15 of 22

STATUS/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 con-

dition and 0 to indicate a normal condition. Reading this register

provides access to the status of each flag and resets 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[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

Not used

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

[1:0]

Not used

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 the GLOB_CMD[3]

bit and is performed at the completion of the GLOB_CMD[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[11] = 1 (DIN = 0xB508) to perform a check-

sum 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 val-

ue, DIAG_STAT[6] is equal to 0. If it does not match, DI-

AG_STAT[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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