ADIS16490BMLZ datasheet(21/38 Pages) AD

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ADIS16490

Data Sheet

Rev. 0 | Page 20 of 37

Self Test Error Flags (DIAG_STS)

Table 17. DIAG_STS Register Definition

Page

Addresses

Default

Access

Flash Backup

0x00

0x0A, 0x0B

0x0000

Table 18. DIAG_STS Bit Definitions

Bits

Description (Default = 0x0000)

[15:6]

Not used

Self test failure, z-axis accelerometer (1 = failure)

Self test failure, y-axis accelerometer (1 = failure)

Self test failure, x-axis accelerometer (1 = failure)

Self test failure, z-axis gyroscope (1 = failure)

Self test failure, y-axis gyroscope (1 = failure)

Self test failure, x-axis gyroscope (1 = failure)

SYS_E_FLAG[5] (see Table 16) contains the pass/fail result (0 =

pass) for the on demand self test (ODST) operations, whereas

the DIAG_STS register (see Table 17 and Table 18) contains

pass/fail flags (0 = pass) for each inertial sensor. Reading the

DIAG_STS register causes all of its bits to restore to 0. The bits

in DIAG_STS return to 1 if the error conditions persists.

Internal Temperature (TEMP_OUT)

Table 19. TEMP_OUT Register Definition

Page

Addresses

Default

Access

Flash Backup

0x00

0x0E, 0x0F

Not applicable

Table 20. TEMP_OUT Bit Definitions

Bits

Description

[15:0]

Temperature data; twos complement, 1°C per 70 LSB,

25°C = 0x0000

The TEMP_OUT register (see Table 19 and Table 20) provides a

coarse measurement of the temperature inside of the

ADIS16490. This data is most useful for monitoring relative

changes in the thermal environment.

Table 21. TEMP_OUT Data Format Examples

Temperature (°C)

Decimal

Hex

Binary

+85

+4200

0x1068

0001 0000 0110 1000

+25 + 2/70

0x0002

0000 0000 0000 0010

+25 + 1/70

0x0001

0000 0000 0000 0001

+25

0x0000

0000 0000 0000 0000

+25 – 1/70

−1

0xFFFF

1111 1111 1111 1111

+25 – 2/70

−2

0xFFFE

1111 1111 1111 1110

−40

−4550

0xEE3A

1110 1110 0011 1010

GYROSCOPE DATA

The gyroscopes in the ADIS16490 measure the angular rate of

rotation around three orthogonal axes (x, y, and z). Figure 35

illustrates the orientation of each gyroscope axis, along with the

direction of rotation that produces a positive response in each

of their measurements.

PIN 1

PIN 23

ωY

Y-AXIS

ωX

X-AXIS

Z-AXIS

ωZ

Figure 35. Gyroscope Axis and Polarity Assignments

Each gyroscope has two output data registers. Figure 36 illustrates

how these two registers combine to support a 32-bit, twos

complement data format for the x-axis gyroscope measurements.

This format also applies to the y- and z-axes as well.

X-AXIS GYROSCOPE DATA

015

X_GYRO_OUT

X_GYRO_LOW

Figure 36. Gyroscope Output Data Structure

X-Axis Gyroscope (X_GYRO_LOW, X_GRYO_OUT)

Table 22. X_GYRO_LOW Register Definition

Page

Addresses

Default

Access

Flash Backup

0x00

0x10, 0x11

Not applicable

Table 23. X_GYRO_LOW Bit Definitions

Bits

Description

[15:0]

X-axis gyroscope data; low word

Table 24. X_GYRO_OUT Register Definition

Page

Addresses

Default

Access

Flash Backup

0x00

0x12, 0x13

Not applicable

Table 25. X_GYRO_OUT Bit Definitions

Bits

Description

[15:0]

X-axis gyroscope data; high word; twos complement,

±100°/sec range; 0°/sec = 0x0000, 1 LSB = 0.005°/sec

The X_GYRO_LOW (see Table 22 and Table 23) and X_GRYO_

OUT (see Table 24 and Table 25) registers contain the gyroscope

data for the x-axis.

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