ADIS16488SLASHPCBZ datasheet(27/36 Pages) AD

27 / 36 page

Data Sheet

ADIS16488

Rev. B | Page 27 of 36

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 49)

contains the alarm output flags and the FNCTIO_CTRL register

(see Table 117) 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 100,

Table 101, Table 102, Table 103, Table 104, Table 105, Table 106,

Table 107, Table 108, and Table 109) of that sensor. The polarity

controls for each alarm are in the ALM_CNFG_x registers (see

Table 110, Table 111, Table 112). 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 100. 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 101. 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 102. 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 103. 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 104. 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 105. 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 106. 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 107. 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 108. 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 109. 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 110. 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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