ADIS16490BMLZ datasheet(22/38 Pages) AD

22 / 38 page

Data Sheet

ADIS16490

Rev. 0 | Page 21 of 37

Y-Axis Gyroscope (Y_GYRO_LOW, Y_GYRO_OUT)

Table 26. Y_GYRO_LOW Register Definition

Page

Addresses

Default

Access

Flash Backup

0x00

0x14, 0x15

Not applicable

Table 27. Y_GYRO_LOW Bit Definitions

Bits

Description

[15:0]

Y-axis gyroscope data; low word

Table 28. Y_GYRO_OUT Register Definition

Page

Addresses

Default

Access

Flash Backup

0x00

0x16, 0x17

Not applicable

Table 29. Y_GYRO_OUT Bit Definitions

Bits

Description

[15:0]

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

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

The Y_GYRO_LOW (see Table 26 and Table 27) and Y_GRYO_

OUT (see Table 28 and Table 29) registers contain the gyroscope

data for the y-axis.

Z-Axis Gyroscope (Z_GYRO_LOW, Z_GYRO_OUT)

Table 30. Z_GYRO_LOW Register Definition

Page

Addresses

Default

Access

Flash Backup

0x00

0x18, 0x19

Not applicable

Table 31. Z_GYRO_LOW Bit Definitions

Bits

Description

[15:0]

Z-axis gyroscope data; additional resolution bits

Table 32. Z_GYRO_OUT Register Definition

Page

Addresses

Default

Access

Flash Backup

0x00

0x1A, 0x1B

Not applicable

Table 33. Z_GYRO_OUT Bit Definitions

Bits

Description

[15:0]

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

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

The Z_GYRO_LOW (see Table 30 and Table 31) and Z_GRYO_

OUT (see Table 32 and Table 33) registers contain the gyroscope

data for the z-axis.

Gyroscope Resolution

Table 34 and Table 35 offer various numerical examples that

demonstrate the format of the angular rate (gyroscopes) data in

both 16-bit and 32-bit formats.

Table 34. 16-Bit Gyroscope Data Format Examples

Rotation Rate

(°/sec)

Decimal

Hex

Binary

+100

+20,000

0x4E20

0100 1110 0010 0000

+0.01

0x0002

0000 0000 0000 0010

+0.005

0x0001

0000 0000 0000 0001

0x0000

0000 0000 0000 0000

−0.005

−1

0xFFFF

1111 1111 1111 1111

−0.01

−2

0xFFFE

1111 1111 1111 1110

−100

−20,000

0xB1E0

1011 0001 1110 0000

Table 35. 32-Bit Gyroscope Data Format Examples

Rotation Rate (°/sec)

Decimal

Hex

+100

+1,310,720,000

0x4E200000

+0.005/215

0x00000002

+0.005/216

0x00000001

0x0000000

−0.005/216

−1

0xFFFFFFFF

−0.005/215

−2

0xFFFFFFFE

−100

−1,310,720,000

0xB1E00000

ACCELERATION DATA

The accelerometers in the ADIS16490 measure both dynamic

and static (response to gravity) acceleration along three orthogonal

axes (x, y, and z). Figure 37 illustrates the orientation of each

accelerometer axis, along with the direction of acceleration that

produces a positive response in each of their measurements.

PIN 1

PIN 23

Y-AXIS

X-AXIS

Z-AXIS

Figure 37. Accelerometer Axis and Polarity Assignments

Each accelerometer has two output data registers. Figure 38

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

twos complement data format for the x-axis accelerometer

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

X-AXIS ACCELEROMETER DATA

015

X_ACCL_OUT

X_ACCL_LOW

Figure 38. Accelerometer Output Data Structure

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