ADIS16488 datasheet(15/36 Pages) AD

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Data Sheet

ADIS16488

Rev. B | Page 15 of 36

ACCELERATION

The registers that use the x_ACCL_OUT format are the primary

registers for the accelerometer measurements (see Table 17,

Table 18, and Table 19). When processing data from these

registers, use a 16-bit, twos complement data format. Table 20

provides x_ACCL_OUT digital coding examples.

Table 17. X_ACCL_OUT (Page 0, Base Address = 0x1E)

Bits

Description

[15:0]

X-axis accelerometer data; twos complement,

±18 g range, 0 g = 0x0000, 1 LSB = 0.8 mg

Table 18. Y_ACCL_OUT (Page 0, Base Address = 0x22)

Bits

Description

[15:0]

Y-axis accelerometer data; twos complement,

±18 g range, 0 g = 0x0000, 1 LSB = 0.8 mg

Table 19. Z_ACCL_OUT (Page 0, Base Address = 0x26)

Bits

Description

[15:0]

Z-axis accelerometer data; twos complement,

±18 g range, 0 g = 0x0000, 1 LSB = 0.8 mg

Table 20. x_ACCL_OUT Data Format Examples

Acceleration

Decimal

Hex

Binary

+18 g

+22,500

0x57E4

0101 0111 1110 0100

+1.6 mg

0x0002

0000 0000 0000 0010

+0.8 mg

0x0001

0000 0000 0000 0001

0 mg

0x0000

0000 0000 0000 0000

−0.8 mg

−1

0xFFFF

1111 1111 1111 1111

−1.6 mg

−2

0xFFFE

1111 1111 1111 1110

−18 g

−22,500

0xA81C

1010 1000 0001 1100

The registers that use the x_ACCL_LOW naming format

provide additional resolution for the accelerometer

measurements (see Table 21, Table 22, and Table 23). The

MSB has a weight of 0.4 mg, and each subsequent bit has ½

the weight of the previous one.

Table 21. X_ACCL_LOW (Page 0, Base Address = 0x1C)

Bits

Description

[15:0]

X-axis accelerometer data; additional resolution bits

Table 22. Y_ACCL_LOW (Page 0, Base Address = 0x20)

Bits

Description

[15:0]

Y-axis accelerometer data; additional resolution bits

Table 23. Z_ACCL_LOW (Page 0, Base Address = 0x24)

Bits

Description

[15:0]

Z-axis accelerometer data; additional resolution bits

DELTA ANGLES

The delta angle outputs represent an integration of the gyro-

scope measurements and use the following formula for all

three axes (x-axis displayed):

(

)

RATE

DEC

Δt

;

∆

where:

ωx is the gyroscope, x-axis.

ΔtS is the time between samples.

When using the internal sample clock, fS is equal to 2.46 kHz.

When using the external clock option, the time between samples

is the time between active edges on the input clock signal, as

measured by the internal clock (252 MHz). See Table 55 for

more information on the DEC_RATE register. The registers

that use the x_DELTANG_OUT format are the primary

registers for the delta angle calculations. When processing data

from these registers, use a 16-bit, twos complement data format

(see Table 24, Table 25, and Table 26). Table 27 provides

x_DELTANG_OUT digital coding examples.

Table 24. X_DELTANG_OUT (Page 0, Base Address = 0x42)

Bits

Description

[15:0]

X-axis delta angle data; twos complement,

±720° range, 0° = 0x0000, 1 LSB = 720°/215 = ~0.022°

Table 25. Y_DELTANG_OUT (Page 0, Base Address = 0x46)

Bits

Description

[15:0]

Y-axis delta angle data; twos complement,

±720° range, 0° = 0x0000, 1 LSB = 720°/215 = ~0.022°

Table 26. Z_DELTANG_OUT (Page 0, Base Address = 0x4A)

Bits

Description

[15:0]

Z-axis delta angle data; twos complement,

±720° range, 0° = 0x0000, 1 LSB = 720°/215 = ~0.022°

Table 27. x_DELTANG_OUT Data Format Examples

Angle (°)

Decimal

Hex

Binary

+720 × (215 − 1)/215

+32,767

0x7FFF

0111 1111 1110 1111

+1440/215

0x0002

0000 0000 0000 0010

+720/215

0x0001

0000 0000 0000 0001

0x0000

0000 0000 0000 0000

−720/215

−1

0xFFFF

1111 1111 1111 1111

−1440/215

−2

0xFFFE

1111 1111 1111 1110

−720

−32,768

0x8000

1000 0000 0000 0000

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