ADIS16505-2SLASHPCBZ datasheet(31/41 Pages) AD

31 / 41 page

Data Sheet

ADIS16505

Rev. C | Page 31 of 41

CALIBRATION

The signal chain of each inertial sensor (accelerometers and

gyroscopes) includes the application of unique correction

formulas, which are derived from extensive characterization

of bias, sensitivity, alignment, response to linear acceleration

(gyroscopes), and point of percussion (accelerometer location)

over a temperature range of −40°C to +85°C, for each ADIS16505.

These correction formulas are not accessible, but users do have

the opportunity to adjust the bias for each sensor individually

through user accessible registers. These correction factors

follow immediately after the factory derived correction formulas

in the signal chain, which processes at a rate of 2000 Hz when

using the internal sample clock.

Calibration, Gyroscope Bias (XG_BIAS_LOW and

XG_BIAS_HIGH)

Table 77. XG_BIAS_LOW Register Definition

Addresses

Default

Access

Flash Backup

0x40, 0x41

0x0000

R/W

Yes

Table 78. XG_BIAS_LOW Bit Definitions

Bits

Description

[15:0]

X-axis gyroscope offset correction; lower word

Table 79. XG_BIAS_HIGH Register Definition

Addresses

Default

Access

Flash Backup

0x42, 0x43

0x0000

R/W

Yes

Table 80. XG_BIAS_HIGH Bit Definitions

Bits

Description

[15:0]

X-axis gyroscope offset correction factor, upper word

The XG_BIAS_LOW (see Table 77 and Table 78) and XG_BIAS_

HIGH (see Table 79 and Table 80) registers combine to allow

users to adjust the bias of the x-axis gyroscopes. The data format

examples in Table 13 also apply to the XG_BIAS_HIGH register,

and the data format examples in Table 14 apply to the 32-bit

combination of the XG_BIAS_LOW and XG_BIAS_HIGH

registers. See Figure 56 for an illustration of how these two

registers combine and influence the x-axis gyroscope

measurements.

X-AXIS

GYRO

FACTORY

CALIBRATION

AND

FILTERING

X_GYRO_OUT X_GYRO_LOW

XG_BIAS_HIGH

XG_BIAS_LOW

Figure 56. User Calibration Signal Path, Gyroscopes

Calibration, Gyroscope Bias (YG_BIAS_LOW and

YG_BIAS_HIGH)

Table 81. YG_BIAS_LOW Register Definition

Addresses

Default

Access

Flash Backup

0x44, 0x45

0x0000

R/W

Yes

Table 82. YG_BIAS_LOW Bit Definitions

Bits

Description

[15:0]

Y-axis gyroscope offset correction; lower word

Table 83. YG_BIAS_HIGH Register Definition

Addresses

Default

Access

Flash Backup

0x46, 0x47

0x0000

R/W

Yes

Table 84. YG_BIAS_HIGH Bit Definitions

Bits

Description

[15:0]

Y-axis gyroscope offset correction factor, upper word

The YG_BIAS_LOW (see Table 81 and Table 82) and YG_BIAS_

HIGH (see Table 83 and Table 84) registers combine to allow

users to adjust the bias of the y-axis gyroscopes. The data format

examples in Table 13 also apply to the YG_BIAS_HIGH register,

and the data format examples in Table 14 apply to the 32-bit

combination of the YG_BIAS_LOW and YG_BIAS_HIGH

registers. These registers influence the y-axis gyroscope

measurements in the same manner that the XG_BIAS_LOW

and XG_BIAS_HIGH registers influence the x-axis gyroscope

measurements (see Figure 56).

Calibration, Gyroscope Bias (ZG_BIAS_LOW and

ZG_BIAS_HIGH)

Table 85. ZG_BIAS_LOW Register Definition

Addresses

Default

Access

Flash Backup

0x48, 0x49

0x0000

R/W

Yes

Table 86. ZG_BIAS_LOW Bit Definitions

Bits

Description

[15:0]

Z-axis gyroscope offset correction; lower word

Table 87. ZG_BIAS_HIGH Register Definition

Addresses

Default

Access

Flash Backup

0x4A, 0x4B

0x0000

R/W

Yes

Table 88. ZG_BIAS_HIGH Bit Definitions

Bits

Description

[15:0]

Z-axis gyroscope offset correction factor, upper word

The ZG_BIAS_LOW (see Table 85 and Table 86) and ZG_BIAS_

HIGH (see Table 87 and Table 88) registers combine to allow

users to adjust the bias of the z-axis gyroscopes. The data format

examples in Table 13 also apply to the ZG_BIAS_HIGH register,

and the data format examples in Table 14 apply to the 32-bit

combination of the ZG_BIAS_LOW and ZG_BIAS_HIGH registers.

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