ADIS16501SLASHPCBZ datasheet(30/45 Pages) AD

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Data Sheet

ADIS16501

USER REGISTER DEFINITIONS

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Rev. B | 30 of 45

ACCELERATION DATA

The accelerometers in the ADIS16501 measure both dynamic and

static (response to gravity) acceleration along the same three

orthogonal axes that define the axes of rotation for the gyroscopes

(x, y, and z). Figure 50 shows the orientation of each accelerometer

axis along with the direction of acceleration that produces a positive

response in each of their measurements.

Figure 50. Accelerometer Axis and Polarity Assignments

Each accelerometer has two output data registers. Figure 51 shows

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

ment data format for the x-axis accelerometer measurements. This

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

Figure 51. Accelerometer Output Data Structure

Accelerometer Resolution

Table 28 and Table 29 offer various numerical examples that dem-

onstrate the format of the linear acceleration data in both 16-bit and

32-bit formats.

Table 28. 16-Bit Accelerometer Data Format Examples

Acceleration

Dec

Hex

Binary

+14 g

+11,200

0x2BC0

0010 1011 1100 0000

+1 g

+800

0x0320

0000 0011 0010 0000

+1.25 mg

0x0001

0000 0000 0000 0001

0x0000

0000 0000 0000 0000

−1.25 mg

−1

0xFFFF

1111 1111 1111 1111

−1 g

−800

0xFCE0

1111 1100 1110 0000

−14 g

−11,200

0xD440

1101 0100 0100 0000

Table 29. 32-Bit Accelerometer Data Format Examples

Acceleration

Decimal

Hex

+14 g

+734,003,200

0x2BC00000

+1 g

+52,428,800

0x03200000

Table 29. 32-Bit Accelerometer Data Format Examples (Continued)

Acceleration

Decimal

Hex

+19.1 ng

0x00000001

0x00000000

−19.1 ng

−1

0xFFFFFFFF

−1 g

−52,428,800

0xFCE00000

−14 g

−734,003,200

0xD4400000

X-Axis Accelerometer (X_ACCL_LOW and

X_ACCL_OUT)

Table 30. X_ACCL_LOW Register Definition

Addresses

Default

Access

Flash Backup

0x10, 0x11

Not applicable

Table 31. X_ACCL_LOW Bit Definitions

Bits

Description

[15:0]

X-axis accelerometer data, additional resolution bits

Table 32. X_ACCL_OUT Register Definition

Addresses

Default

Access

Flash Backup

0x12, 0x13

Not applicable

Table 33. X_ACCL_OUT Bit Definitions

Bits

Description

[15:0]

X-axis accelerometer data, high word, twos complement, ±14 g range,

0 g = 0x0000, 1 LSB = 1.25 mg

The X_ACCL_LOW (see Table 30 and Table 31) and X_ACCL_

OUT (see Table 32 and Table 33) registers contain the accelerome-

ter data for the x-axis.

Y-Axis Accelerometer (Y_ACCL_LOW and

Y_ACCL_OUT)

Table 34. Y_ACCL_LOW Register Definition

Addresses

Default

Access

Flash Backup

0x14, 0x15

Not applicable

Table 35. Y_ACCL_LOW Bit Definitions

Bits

Description

[15:0]

Y-axis accelerometer data, additional resolution bits

Table 36. Y_ACCL_OUT Register Definition

Addresses

Default

Access

Flash Backup

0x16, 0x17

Not applicable

Table 37. Y_ACCL_OUT Bit Definitions

Bits

Description

[15:0]

Y-axis accelerometer data, high word, twos complement, ±14 g range,

0 g = 0x0000, 1 LSB = 1.25 mg

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