ADIS16251 Analog Devices, ADIS16251 Datasheet - Page 18

• Manufacturer Part Number: ADIS16251
• Description: Programmable Low Power Gyroscope
• Manufacturer: Analog Devices

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DataSheet
ADIS16251
The ALM_CTRL register controls the source data selection,
static/dynamic selection, filtering selection and digital I/O
usage for the alarms.
Rate of Change Calculation
Table 31. ALM_MAG1 Register Definition
Address
0x21, 0x20
The ALM_MAG1 register contains the threshold level for
Alarm 1. The contents of this register are nonvolatile.
Table 32. ALM_MAG1 Bit Designations
Bit
15
14
13:0
Table 33. ALM_SMPL1 Register Definition
Address
0x25, 0x24
Table 34. ALM_SMPL1 Bit Designations
Bit
15:8
7:0
Table 35. ALM_MAG2 Register Definition
Address
0x23, 0x22
Table 36. ALM_MAG2 Bit Designations
Bit
15
14
13:0
Y
N
y(n)
M
Y
Rate
Compare
C
C
DS
C
=
=
4
=
=
=
of
Factor
N
U
Magnitude
Number
Sampled
1
Description
Comparison polarity: 1 = greater than, 0 = less than
Not used
Data bits: format matches source data format
DS
ChangeAlar
.com
Y
Description
Comparison polarity: 1 = greater than, 0 = less than
Not used
Data bits: format matches source data format
Description
Not used
Data bits
N
∑
n
C
DS
=
1
to
with
y
be
(
of
Output
n
Default
0x0000
Default
0x0000
Default
0x0000
compared
+
for
M
samples
) 1
m
C
comparison
−
⇒
according
y
Data
(
n
)
in
with
ALM_SMPL1/
to
M
in
Format
N/A
Format
Binary
Format
N/A
ALM_MAG1/2
C
ALM_MAG1/2
2
MSB
Access
R/W
Access
R/W
Access
R/W
(
>
or
Rev. PrA | Page 18 of 20
<
?
)
Table 37. ALM_SMPL2 Register Definition
Address
0x27, 0x26
Table 38. ALM_SMPL2 Bit Designations
Bit
15:8
7:0
Table 39. ALM_CTRL Register Definition
Address
0x29, 0x28
Table 40. ALM_CTRL Bit Designations
Bit
15
14:12
11
10:8
7:5
4
3
2
1
0
Value
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
Description
Not used
Data bits
Default
0x0000
Default
0x0000
Alarm 2 source selection
Description
Rate of change (ROC) enable for alarm 2
Rate of change (ROC) enable for alarm 1
Alarm 1 source selection
Not used
Filtered data comparison
Not used
Alarm output enable
Alarm output polarity
Alarm output line select
Preliminary Technical Data
1 = rate of change, 0 = static level
Disable
Power supply output
Gyroscope output
Inactive
Inactive
Auxiliary ADC output
Temperature sensor output
Inactive
1 = rate of change, 0 = static level
Disable
Power supply output
Gyroscope output
Inactive
Inactive
Auxiliary ADC output
Temperature sensor output
Inactive
1 = filtered data, 0 = unfiltered data
1 = enabled, 0 = disabled
1 = active high, 0 = active low
1 = DIO1, 0 = DIO0
Format
Binary
Format
N/A
Access
R/W
Access
R/W