ADIS16IMU1SLASHPCBZ datasheet(26/38 Pages) AD

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ADIS16486

Data Sheet

Rev. 0 | Page 26 of 38

Flash Memory Endurance Counter, FLSHCNT_LOW,

FLSHCNT_HIGH

The FLSHCNT_LOW (see Table 136 and Table 137) and

FLSHCNT_HIGH (see Table 138 and Table 139) registers

combine to create a 32-bit binary counter that tracks the number

of flash memory write cycles. In addition to the number of

write cycles, the flash memory has a finite service lifetime,

which depends on the junction temperature. Figure 27 provides

guidance for estimating the retention life for the flash memory

at specific junction temperatures. The junction temperature is

approximately 7°C above the case temperature.

Table 136. FLSHCNT_LOW Register Definition

Page ID

Addresses

Default

Access

Flash Backup

0x02

0x7C, 0x7D

Not applicable

R/W

Yes

Table 137. FLSHCNT_LOW Bit Definition

Bits

Description (No Default)

[15:0]

Flash memory write counter, low word

Table 138. FLSHCNT_HIGH Register Definition

Page ID

Addresses

Default

Access

Flash Backup

0x02

0x7E, 0x7F

Not applicable

R/W

Yes

Table 139. FLSHCNT_HIGH Bit Definition

Bits

Description (No Default)

[15:0]

Flash memory write counter, high word

600

450

300

150

JUNCTION TEMPERATURE (°C)

100

125

135

150

Figure 27. Flash Memory Retention

Global Commands, GLOB_CMD

The GLOB_CMD register (see Table 140 and Table 141) provides

trigger bits for several operations. Write a 1 to the appropriate

bit in the GLOB_CMD register to start a desired function.

Table 140. GLOB_CMD Register Definition

Page ID

Addresses

Default

Access

Flash Backup

0x03

0x02, 0x03

0x0000

Table 141. GLOB_CMD Bit Definitions

Bits

Description (Default = 0x0000)

[15:8]

Not used

Software reset

Factory calibration restore

[5:4]

Not used

Flash memory update

Not used

Self test

Bias correction update

Software Reset

Select Page 3 (DIN = 0x8003) and set GLOB_CMD, Bit 7 = 1

(DIN = 0x8280, then DIN = 0x8300) to initiate a reset of the

ADIS16486. This reset removes all data, initializes all of the

registers from their flash settings, and restarts data sampling

and processing. This function provides a firmware alternative

to providing a low pulse on the RST pin (see Table 6).

Factory Calibration Restore

Select Page 3 (DIN = 0x8003) and set GLOB_CMD, Bit 6 = 1

(DIN = 0x8240, then DIN = 0x8300) to restore the factory

calibration. This restoration writes 0x0000 to the following

registers: X_GYRO_SCALE, Y_GYRO_SCALE,

Z_GYRO_SCALE, X_ACCL_SCALE, Y_ACCL_SCALE,

Z_ACCL_SCALE, XG_BIAS_LOW, XG_BIAS_HIGH,

YG_BIAS_LOW, YG_BIAS_HIGH, ZG_BIAS_LOW,

ZG_BIAS_HIGH, XA_BIAS_LOW, XA_BIAS_HIGH,

YA_BIAS_LOW, YA_BIAS_HIGH, ZA_BIAS_LOW, and

ZA_BIAS_HIGH.

Flash Memory Update

Select Page 3 (DIN = 0x8003) and set GLOB_CMD, Bit 3 = 1

(DIN = 0x8208, then DIN = 0x8300) to initiate a manual flash

update. SYS_E_FLAG, Bit 6 (see Table 20) identifies success (0)

or failure (1) in completing this process.

ODST

Select Page 3 (DIN = 0x8003) and set GLOB_CMD, Bit 1 = 1

(DIN = 0x8202, then DIN = 0x8300) to run the ODST routine,

which executes the following steps:

1. Measure the output on each sensor.

2. Activate an internal force on the mechanical elements of

each sensor, which simulates the force associated with

actual inertial motion.

3. Measure the output response on each sensor.

4. Deactivate the internal force on each sensor.

5. Calculate the difference between the force on and normal

operating conditions (force off).

6. Compare the difference with internal pass and fail criteria.

7. Report the pass and fail results for each sensor in DIAG_

STS (see Table 22) and the overall pass and fail flag in SYS_

E_FLAG, Bit 5 (see Table 20).

ADIS16IMU1/PCBZ Datasheet(PDF) 26 Page - Analog Devices

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