ADIS16480SLASHPCBZ datasheet(34/40 Pages) AD

34 / 40 page

ADIS16480

Data Sheet

Rev. 0 | Page 34 of 40

ALARMS

Each sensor has an independent alarm function that provides

controls for alarm magnitude, polarity, and enabling a dynamic

rate of change option. The ALM_STS register (see Table 61)

contains the alarm output flags and the FNCTIO_CTRL register

(see Table 149) provides an option for configuring one of the

digital I/O lines as an alarm indicator.

STATIC ALARM USE

The static alarm setting compares each sensor’s output with

the trigger settings in the xx_ALM_MAGN registers (see

Table 132 through Table 141) of that sensor. The polarity controls

for each alarm are in the ALM_CNFG_x registers (see Table 142,

Table 143, Table 144). The polarity establishes whether greater

than or less than produces an alarm condition. The comparison

between the xx_ALM_MAGN value and the output data only

applies to the upper word or 16 bits of the output data.

DYNAMIC ALARM USE

The dynamic alarm setting provides the option of comparing the

change in each sensor’s output over a period of 48.7 ms with that

sensor’s xx_ALM_MAGN register.

Table 132. XG_ALM_MAGN (Page 3, Base Address = 0x28)

Bits

Description (Default = 0x0000)

[15:0]

X-axis gyroscope alarm threshold settings,

Twos complement, 0°/sec = 0x0000, 1 LSB = 0.02°/sec

Table 133. YG_ALM_MAGN (Page 3, Base Address = 0x2A)

Bits

Description (Default = 0x0000)

[15:0]

Y-axis gyroscope alarm threshold settings,

Twos complement, 0°/sec = 0x0000, 1 LSB = 0.02°/sec

Table 134. ZG_ALM_MAGN (Page 3, Base Address = 0x2C)

Bits

Description (Default = 0x0000)

[15:0]

Z-axis gyroscope alarm threshold settings,

Twos complement, 0°/sec = 0x0000, 1 LSB = 0.02°/sec

Table 135. XA_ALM_MAGN (Page 3, Base Address = 0x2E)

Bits

Description (Default = 0x0000)

[15:0]

X-axis accelerometer alarm threshold settings,

Twos complement, 0 g = 0x0000, 1 LSB = 0.8 mg

Table 136. YA_ALM_MAGN (Page 3, Base Address = 0x30)

Bits

Description (Default = 0x0000)

[15:0]

Y-axis accelerometer alarm threshold settings,

Twos complement, 0 g = 0x0000, 1 LSB = 0.8 mg

Table 137. ZA_ALM_MAGN (Page 3, Base Address = 0x32)

Bits

Description (Default = 0x0000)

[15:0]

Z-axis accelerometer alarm threshold settings,

Twos complement, 0 g = 0x0000, 1 LSB = 0.8 mg

Table 138. XM_ALM_MAGN (Page 3, Base Address = 0x34)

Bits

Description (Default = 0x0000)

[15:0]

X-axis magnetometer alarm threshold settings,

Twos complement, 0 gauss = 0x0000,

1 LSB = 0.1 mgauss

Table 139. YM_ALM_MAGN (Page 3, Base Address = 0x36)

Bits

Description (Default = 0x0000)

[15:0]

Y-axis magnetometer alarm threshold settings,

Twos complement, 0 gauss = 0x0000,

1 LSB = 0.1 mgauss

Table 140. ZM_ALM_MAGN (Page 3, Base Address = 0x38)

Bits

Description (Default = 0x0000)

[15:0]

Z-axis magnetometer alarm threshold settings,

Twos complement, 0 gauss = 0x0000,

1 LSB = 0.1 mgauss

Table 141. BR_ALM_MAGN (Page 3, Base Address = 0x3A)

Bits

Description (Default = 0x0000)

[15:0]

Z-axis barometer alarm threshold settings,

Twos complement, 0 bar = 0x0000, 1 LSB = 40 µbar

Table 142. ALM_CNFG_0 (Page 3, Base Address = 0x20)

Bits

Description (Default = 0x0000)

X-axis accelerometer alarm (1 = enabled)

Not used

X-axis accelerometer alarm polarity (1 = greater than)

X-axis accelerometer dynamic enable (1 = enabled)

Z-axis gyroscope alarm (1 = enabled)

Not used

Z-axis gyroscope alarm polarity (1 = greater than)

Z-axis gyroscope dynamic enable (1 = enabled)

Y-axis gyroscope alarm (1 = enabled)

Not used

Y-axis gyroscope alarm polarity (1 = greater than)

Y-axis gyroscope dynamic enable (1 = enabled)

X-axis gyroscope alarm (1 = enabled)

Not used

X-axis gyroscope alarm polarity (1 = greater than)

X-axis gyroscope dynamic enable (1 = enabled)

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