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ADIS16489 Datasheet(PDF) 31 Page - Analog Devices

Part # ADIS16489
Description  Seven Degrees of Freedom Inertial Sensor
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
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ADIS16489 Datasheet(HTML) 31 Page - Analog Devices

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Data Sheet
ADIS16489
Rev. B | Page 31 of 40
POWER MANAGEMENT (SLP_CNT)
Table 162. SLP_CNT Register Definitions
Page
Addresses
Default
Access
Flash Backup
0x03
0x10, 0x11
Not applicable
W
No
Table 163. SLP_CNT Bit Definitions
Bits
Description
[15:10]
Not used
9
Power-down mode
8
Normal sleep mode
[7:0]
Programmable time bits; 1 sec/LSB; 0x00 = indefinite
The SLP_CNT register (see Table 162 and Table 163) provides
controls for both power-down mode and sleep modes. The
trade-off between power-down mode and sleep mode is idle
power and recovery time. Power-down mode offers the best
power consumption but requires the most time to recover. In
addition, all volatile settings are lost during power-down,
whereas sleep mode preserves these settings.
To initiate a sleep mode for a specific period of time, turn to
Page 3 (DIN = 0x8003), write the amount of sleep time to SLP_
CNT[7:0] and then set SLP_CNT[8] = 1 (DIN = 0x9101) to start
the sleep period. Sleep mode begins when the CS line goes high,
after setting SLP_CNT[8] = 1. See Table 164 for a command
sequence example to place the ADIS16489 into sleep mode for
100 sec.
Table 164. Command Sequence, Timed Sleep Mode Example
DIN
Description
0x8003
Turn to Page 3
0x9064
SLP_CNT[7:0] = 0x64, 100 sec sleep time
0x9101
SLP_CNT[8] = 1, start sleep mode
To initiate an indefinite sleep mode, set SLP_CNT[7:0] = 0x00
(DIN = 0x9000), then set SLP_CNT[8] = 1 (DIN = 0x9101). To
initiate a power-down period of 100 sec, use the configuration
sequence in Table 164, with one exception: set SLP_CNT[9] = 1
(DIN = 0x9102) instead of setting SLP_CNT[8] = 1 (DIN =
0x9101). To initiate an indefinite power-down, set
SLP_CNT[7:0] = 0x00 first, and then set SLP_CNT[9] = 1 (DIN =
0x9102).
To wake the device from sleep or power-down mode, use one of
the following options to restore normal operation:
Assert CS from high to low.
Pulse RST low, then high again.
Cycle the power.
If the sleep mode and power-down mode bits are both set high,
the normal sleep mode bit (SLP_CNT[8]) takes precedence.
FIR FILTER CONTROL (FILTR_BNK_0, FILTR_BNK_1)
Table 165. FILTR_BNK_0 Register Definitions
Page
Addresses
Default
Access
Flash Backup
0x03
0x16, 0x17
0x0000
R/W
Yes
Table 166. FILTR_BNK_0 Bit Definitions
Bits
Description
15
Don’t care
14
Y-axis accelerometer filter enable (1 = enabled)
[13:12]
Y-axis accelerometer filter bank selection:
00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D
11
X-axis accelerometer filter enable (1 = enabled)
[10:9]
X-axis accelerometer filter bank selection:
00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D
8
Z-axis gyroscope filter enable (1 = enabled)
[7:6]
Z-axis gyroscope filter bank selection:
00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D
5
Y-axis gyroscope filter enable (1 = enabled)
[4:3]
Y-axis gyroscope filter bank selection:
00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D
2
X-axis gyroscope filter enable (1 = enabled)
[1:0]
X-axis gyroscope filter bank selection:
00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D
Table 167. FILTR_BNK_1 Register Definitions
Page
Addresses
Default
Access
Flash Backup
0x03
0x18, 0x19
0x0000
R/W
Yes
Table 168. FILTR_BNK_1 Bit Definitions
Bits
Description
[15:3]
Don’t care
2
Z-axis accelerometer filter enable (1 = enabled)
[1:0]
Z-axis accelerometer filter bank selection:
00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D
The FILTR_BNK_0 (see Table 165 and Table 166) and FILTR_
BNK_1 (see Table 167 and Table 168) registers provide the
configuration controls for the FIR filter bank in the signal chain
of each sensor (see Figure 33). These registers provide on/off
control for the FIR bank for each inertial sensor, along with the
FIR bank (A, B, C, D) that each sensor uses.
ALARM CONFIGURATION (ALM_CNFG_0,
ALM_CNFG_1, ALM_CFG_2)
The ALM_CNFG_0 (see Table 169 and Table 170), ALM_
CNFG_1 (see Table 171 and Table 172) and ALM_CNFG_2
(see Table 173 and Table 174) registers provide three
configuration control options for the alarm functions of each
inertial sensor and the barometer: on/off, polarity, and mode of
operation (static/dynamic).
Table 169. ALM_CNFG_0 Register Definitions
Page
Addresses
Default
Access
Flash Backup
0x03
0x20, 0x21
0x0000
R/W
Yes


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