ADIS16375BMLZ datasheet(23/28 Pages) AD

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Data Sheet

ADIS16375

Rev. E | Page 23 of 28

ALARMS

The alarm function provides independent alarms for each

inertial sensor. Table 79 contains a list of registers that provide

configuration and control inputs for the alarm function.

Table 79. Registers for Alarm Configuration

Page

Address

Description

ALM_CONFIG1

0x20

Alarm configuration

ALM_CONFIG2

0x22

Alarm configuration

XG_ALM_MAG

0x40

X-axis gyroscope trigger

YG_ALM_MAG

0x42

Y-axis gyroscope trigger

ZG_ALM_MAG

0x44

Z-axis gyroscope trigger

XA_ALM_MAG

0x46

X-axis accelerometer trigger

YA_ALM_MAG

0x48

Y-axis accelerometer trigger

ZA_ALM_MAG

0x4A

Z-axis accelerometer trigger

Static Alarm Use

The static alarm setting compares each sensor’s output with the

trigger settings in the xG_ALM_MAG and xA_ALM_MAG

registers (see Table 80, Table 81, Table 82, Table 83, Table 84,

and Table 85) of that sensor. The polarity controls for each alarm

are in the ALM_CONFIG_x registers (see Table 86 and Table 87).

The polarity establishes whether greater than or less than

produces an alarm condition. The comparison between the

xG_ALM_MAG (or xA_ALM_MAG) value and the output data

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

Table 80. XG_ALM_MAG (Page 3, Base Address = 0x40)

Bits

Description (Default = 0x0000)

[15:0]

X-axis gyroscope alarm threshold settings; matches

format of the X_GYRO_OUT register in Table 11

Table 81. YG_ALM_MAG (Page 3, Base Address = 0x42)

Bits

Description (Default = 0x0000)

[15:0]

Y-axis gyroscope alarm threshold settings; matches

format of the Y_GYRO_OUT register in Table 12

Table 82. ZG_ALM_MAG (Page 3, Base Address = 0x44)

Bits

Description (Default = 0x0000)

[15:0]

Z-axis gyroscope alarm threshold settings; matches

format of the Z_GYRO_OUT register in Table 13

Table 83. XA_ALM_MAG (Page 3, Base Address = 0x46)

Bits

Description (Default = 0x0000)

[15:0]

X-axis accelerometer alarm threshold settings; uses

the same format as X_ACCL_OUT, see Table 18

Table 84. YA_ALM_MAG (Page 3, Base Address = 0x48)

Bits

Description (Default = 0x0000)

[15:0]

Y-axis accelerometer alarm threshold settings; uses

the same format as Y_ACCL_OUT, see Table 19

Table 85. ZA_ALM_MAG (Page 3, Base Address = 0x4A)

Bits

Description (Default = 0x0000)

[15:0]

Z-axis accelerometer alarm threshold settings; uses

the same format as Z_ACCL_OUT, see Table 20

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_MAG register.

Alarm Reporting

Monitor each sensor’s alarm by reading the ALM_STS register

(see Table 43), located in Page 0. The FNCIO_CTRL register

(see Table 93) provides a control for establishing any of the

DIOx lines as an alarm indicator output signal.

Table 86. ALM_CONFIG_1 (Page 3, 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)

Table 87. ALM_CONFIG_2 (Page 3, Base Address = 0x22)

Bits

Description (Default = 0x0000)

[15:8]

Not used

[7]

Z-axis accelerometer alarm (1 = enabled)

[6]

Not used

[5]

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

[4]

Z-axis accelerometer dynamic enable (1 = enabled)

[3]

Y-axis accelerometer alarm (1 = enabled)

[2]

Not used

[1]

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

[0]

Y-axis accelerometer dynamic enable (1 = enabled)

Alarm Example

Table 88 offers an alarm configuration example, which sets the X-axis

gyroscope alarm to trip when X_GYRO_OUT > 131.1°/sec (0x2710).

Table 88. Alarm Configuration Example 1

DIN

Description

0xC010

Set XA_ALM_MAG[7:0] = 0x10

0xC127

Set XA_ALM_MAG[15:8] = 0x27

0xA006

Set ALM_CONFIG_1[7:0] = 0x06

0xA100

Set ALM_CONFIG_1[15:8] = 0x00

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