ADIS16488A datasheet(28/35 Pages) AD

Part #	ADIS16488A

Description	Tactical Grade, Ten Degrees of Freedom Inertial Sensor

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ADIS16488A

Data Sheet

Rev. C | Page 28 of 35

ALARMS

Each sensor has an independentalarm function that provides

controls for alarm magnitude, polarity, andenabling a dynamic

rate-of-change option. The ALM_STS register(see Table 50)

contains the alarm outputflags and the FNCTIO_CTRLregister

(see Table 118)provides an option for configuring oneof the

digital input/output lines as an alarm indicator.

STATIC ALARM USE

The staticalarm setting compares the output of each sensor

with the trigger settings in the xx_ALM_MAGN registers (see

Table 101 through Table 110)of that sensor.

Table 101. 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 102. 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 103. 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 104. XA_ALM_MAGN (Page3, 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 105. 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 106. 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 107. 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 108. 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 109. ZM_ALM_MAGN(Page 3, Base Address = 0x38)

Bits

Description (Default = 0x0000)

[15:0]

Z-axis magnetometer alarm thresholdsettings,

twos complement, 0 gauss = 0x0000,

1 LSB = 0.1 mgauss

Table 110. 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

Static Alarm Polarity Controls

The alarm polarity settings, locatedin the ALM_CNFG_x

registers (see Table111 to Table 113), establish the relationship

for the condition that causes the corresponding alarmflag to be

active. For example, when ALM_CNFG_0[13]= 1, the alarm

flag for the x-axis accelerometer(ALM_STS[3], see Table 50)

becomes active (equal to 1)when X_ACCL_OUT is greater

than XA_ALM_MAGN.

Table 111. ALM_CNFG_0(Page3, Base Address = 0x20)

Bits

Description (Default = 0x0000)

15

X-axis accelerometer alarm (1 = enabled)

14

Not used

13

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

12

X-axis accelerometer dynamic enable (1 = enabled)

11

Z-axis gyroscope alarm (1 = enabled)

10

Not used

9

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

8

Z-axis gyroscope dynamic enable (1 = enabled)

7

Y-axis gyroscope alarm (1 = enabled)

6

Not used

5

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

4

Y-axis gyroscope dynamic enable (1 = enabled)

3

X-axis gyroscope alarm (1 = enabled)

2

Not used

1

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

0

X-axis gyroscope dynamic enable (1 = enabled)

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