ADIS16501SLASHPCBZ datasheet(34/45 Pages) AD

34 / 45 page

Data Sheet

ADIS16501

USER REGISTER DEFINITIONS

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Rev. B | 34 of 45

where:

x is the x-axis.

n is the sample time, prior to the decimation filter.

D is the decimation rate (DEC_RATE + 1, see Table 111).

fS is the sample rate.

d is the incremental variable in the summation formula.

aX is the x-axis acceleration.

When using the internal sample clock, fS is equal to a nominal rate

of 2000 SPS. For better precision in this measurement, measure

the internal sample rate (fS) using the data ready signal on the DR

pin (DEC_RATE = 0x0000, see Table 110), divide each delta angle

result (from the delta angle output registers) by the data ready

frequency, and multiply it by 2000. Each axis of the delta velocity

measurements has two output data registers. Figure 55 shows how

these two registers combine to support 32‑bit, twos complement

data format for the delta velocity measurements along the x-axis.

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

Figure 55. Delta Velocity Output Data Structure

X-Axis Delta Velocity (X_DELTVEL_LOW and

X_DELTVEL_OUT)

Table 64. X_DELTVEL_LOW Register Definition

Addresses

Default

Access

Flash Backup

0x30, 0x31

Not applicable

Table 65. X_DELTVEL_LOW Bit Definitions

Bits

Description

[15:0]

X-axis delta velocity data, additional resolution bits

Table 66. X_DELTVEL_OUT Register Definition

Addresses

Default

Access

Flash Backup

0x32, 0x33

Not applicable

Table 67. Table 67. X_DELTVEL_OUT Bit Definitions

Bits

Description

[15:0]

X-axis delta velocity data, twos complement, ±125 m/sec range, 0

m/sec = 0x0000, 1 LSB = 125 m/sec ÷ 215 = 0.003814697 m/sec

The X_DELTVEL_LOW (see Table 64 and Table 65) and X_DELT-

VEL_OUT (see Table 66 and Table 67) registers contain the delta

velocity data for the x-axis.

Y-Axis Delta Velocity (Y_DELTVEL_LOW and

Y_DELTVEL_OUT)

Table 68. Y_DELTVEL_LOW Register Definition

Addresses

Default

Access

Flash Backup

0x34, 0x35

Not applicable

Table 69. Y_DELTVEL_LOW Bit Definitions

Bits

Description

[15:0]

Y-axis delta velocity data, additional resolution bits

Table 70. Y_DELTVEL_OUT Register Definition

Addresses

Default

Access

Flash Backup

0x36, 0x37

Not applicable

Table 71. Y_DELTVEL_OUT Bit Definitions

Bits

Description

[15:0]

Y-axis delta velocity data, twos complement, ±125 m/sec range, 0

m/sec = 0x0000, 1 LSB = 125 m/sec ÷ 215 = 0.003814697 m/sec

The Y_DELTVEL_LOW (see Table 68 and Table 69) and Y_DELT-

VEL_OUT (see Table 70 and Table 71) registers contain the delta

velocity data for the y-axis.

Z-Axis Delta Velocity (Z_DELTVEL_LOW and

Z_DELTVEL_OUT)

Table 72. Z_DELTVEL_LOW Register Definition

Addresses

Default

Access

Flash Backup

0x38, 0x39

Not applicable

Table 73. Z_DELTVEL_LOW Bit Definitions

Bits

Description

[15:0]

Z-axis delta velocity data, additional resolution bits

Table 74. Z_DELTVEL_OUT Register Definition

Addresses

Default

Access

Flash Backup

0x3A, 0x3B

Not applicable

Table 75. Z_DELTVEL_OUT Bit Definitions

Bits

Description

[15:0]

Z-axis delta velocity data, twos complement, ±125 m/sec range, 0

m/sec = 0x0000, 1 LSB = 125 m/sec ÷ 215 = 0.003814697 m/sec

The Z_DELTVEL_LOW (see Table 72 and Table 73) and Z_DELT-

VEL_OUT (see Table 74 and Table 75) registers contain the delta

velocity data for the z-axis.

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