ADIS16305SLASHPCBZ datasheet(17/20 Pages) AD

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ADIS16305

Rev. 0 | Page 17 of 20

Alarm Registers

The alarm function provides monitoring for two independent

conditions. The ALM_CTRL register provides control inputs

for trigger source, data filtering (prior to comparison), static

comparison, dynamic rate-of-change comparison, and output

indicator configurations. The ALM_MAGx registers establish

the trigger threshold and polarity configurations. Table 33 gives

an example of how to configure a static alarm. The ALM_SMPLx

registers provide the number of samples to use in the dynamic

rate-of-change configuration. The period equals the number in

the ALM_SMPLx register multiplied by the sample period time,

which is established by the SMPL_PRD register. See Table 34 for

an example of how to configure the sensor for this type of function.

Table 30. ALM_MAG1, ALM_MAG2 Bit Descriptions

Bit(s)

Description

[15]

Comparison polarity (1 = greater than, 0 = less than)

[14]

Not used

[13:0]

Data, matches the format of the trigger source

Table 31. ALM_SMPL1, ALM_SMPL2 Bit Descriptions

Bits

Description

[15:8]

Not used

[7:0]

Data bits: number of samples (both 0x00 and 0x01 = 1)

Table 32. ALM_CTRL Bit Designations

Bits

Value

Description

[15:12]

Alarm 2 trigger source selection

0000

Disable

0001

Power supply output

0010

Gyroscope output

0011

Not used

0100

Not used

0101

X-axis accelerometer output

0110

Y-axis accelerometer output

0111

Z-axis accelerometer output

1000

Temperature output

1001

Pitch angle output

1010

Roll angle output

1011

Auxiliary ADC measurement

[11:8]

Alarm 1 trigger source selection (see Bits[15:12])

[7]

Rate of change (ROC) enable for Alarm 2

1 = rate of change, 0 = static level

[6]

Rate of change (ROC) enable for Alarm 1

1 = rate of change, 0 = static level

[5]

Not used

[4]

Comparison data filter setting1

1 = filtered data, 0 = unfiltered data

[3]

Not used

[2]

Alarm output enable (1 = enable, 0 = disable)

[1]

Alarm output polarity (1 = high, 0 = low)

[0]

Alarm output line select (1 = DIO2, 0 = DIO1)

1 Incline outputs (pitch, roll) always use filtered data in this comparison.

Table 33. Alarm Configuration Example 1

DIN

Description

0xAF55,

ALM_CTRL = 0x5517

0xAE17

Alarm 1 input = XACCL_OUT

Alarm 2 input = XACCL_OUT

Static level comparison, filtered data

DIO2 output indicator, positive polarity

0xA783,

ALM_MAG1 = 0x8341

0xA641

Alarm 1 is true if XACCL_OUT > +0.5 g

0xA93C,

ALM_MAG2 = 0x3CBF

0xA8BF

Alarm 2 is true if XACCL_OUT < −0.5 g

Table 34. Alarm Configuration Example 2

DIN

Description

0xAF76,

ALM_CTRL = 0x76C7

0xAEC7

Alarm 1 input = YACCL_OUT

Alarm 2 input = ZACCL_OUT

Rate-of-change comparison, unfiltered data

DIO2 output indicator, positive polarity

0xB601

SMPL_PRD = 0x0001

Sample rate = 819.2 SPS

0xAA08

ALM_SMPL1 = 0x0008

Alarm 1 rate-of-change period = 9.77 ms

0xAC50

ALM_SMPL2 = 0x0050

Alarm 2 rate-of-change period = 97.7 ms

0xA783,

ALM_MAG1 = 0x8341

0xA641

Alarm 1 is true when Δ XACCL_OUT > 0.5 g over a

period of 9.77 ms

0xA93C,

ALM_MAG2 = 0x3CBF

0xA8BF

Alarm 1 is true when Δ XACCL_OUT < −0.5 g over a

period of 97.7 ms

PRODUCT IDENTIFICATION

Table 35 provides a summary of the registers that identify the

product: PROD_ID, which identifies the product type; LOT_ID1

and LOT_ID2, the 32-bit lot identification code; and SERIAL_NUM,

which displays the 12-bit serial number. All four registers are

two bytes in length. When using the SERIAL_NUM value to

calculate the serial number, mask off the upper four bits and

convert the remaining 12 bits to a decimal number.

Table 35. Identification Registers

Address

Description

LOT_ID1

0x52

Lot Identification Code 1

LOT_ID2

0x54

Lot Identification Code 2

PROD_ID

0x56

ADIS16305: 0x3FB1 (16,305)

SERIAL_NUM

0x58

Serial number, 0 to 4095

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