ADIS16265ACCZ(RevPrA) 데이터 시트보기 (PDF) - Analog Devices
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ADIS16265ACCZ Datasheet PDF : 19 Pages
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ADIS16260/ADIS16265
STATUS AND DIAGNOSTICS
The ADIS16260/ADIS16265 provide a number of status and
diagnostic functions. Table 25 provides a summary of these
functions, along with their appropriate control registers.
Table 25. Status and Diagnostic Functions
Function
Data-ready I/O indicator
Self-test, mechanical check for MEMS sensor
Status, check for predefined error conditions
Flash memory endurance
Alarms, configure and check for user-specific
conditions
Register
MSC_CTRL
MSC_CTRL
STATUS
ENDURANCE
ALM_MAG1/2
ALM_SMPL1/2
ALM_CTRL
Data-Ready I/O Indicator
The data-ready function provides an indication of updated
output data. The MSC_CTRL register provides the opportunity
to configure either of the general-purpose I/O pins (DIO0 and
DIO1) as a data-ready indicator signal. After each output register
update, the digital I/O changes states, then returns to its original
state, creating a pulsed waveform. The duty cycle of that waveform
is in between 15% and 35%.
Table 26. MSC_CTRL Register Definition
Address
Default
Format
0x35, 0x34
0x0000
N/A
Access
R/W
Table 27. MSC_CTRL Bit Descriptions
Bit
Description
15:11 Not used
10
Internal self-test enable
1 = enabled
0 = disabled
9
External negative rotation self-test enable
1 = enabled
0 = disabled
8
External positive rotation self-test enable
1 = enabled
0 = disabled
7:3
Not used
2
Data-ready enable
1 = enabled
0 = disabled
1
Data-ready polarity
1 = active high
0 = active low
0
Data-ready line select
1 = DIO1
0 = DIO0
Self-Test
The MSC_CTRL register also provides a self-test function, which
verifies the MEMS sensor’s mechanical integrity. There are two
different self-test options: (1) internal self-test and (2) external
self-test. The internal test provides a simple, two-step process
for checking the MEMS sensor: (1) start the process by writing
a 1 to Bit 10 in the MSC_CTRL register and (2) check the result
by reading Bit 5 of the STATUS register, after 35 ms.
The external self-test is a static condition that can be enabled
and disabled. In this test, both positive and negative MEMS
sensor movements are available. After writing to the appropriate
control bit, the GYRO_OUT register reflects the changes after a
delay that reflects the sensor signal chain response time.
For example, the standard 52 Hz bandwidth reflects an
exponential response with a time constant of 3.2 ms. If the
bandwidth is reduced externally (capacitor across RATE and FILT)
or internally (increasing the number of filter taps, SENS/AVG),
this time constant increases. For the internal self-test option,
increasing the delay can produce false alarms, since the internal
timing for this function is optimized for maximum bandwidth.
The appropriate bit definitions for self-test are listed in Table 26
and Table 27.
Status Conditions
The STATUS register contains the following error-condition
flags: Alarm conditions, self-test status, angular rate over range,
SPI communication failure, control register update failure, and
power supply out of range. See Table 28 and Table 29 for the
appropriate register access and bit assignment for each flag.
The bits assigned for checking power supply range and angular
rate over range automatically reset to 0 when the error
condition no longer exists. The remaining error-flag bits in the
STATUS register require a read in order to return them to 0.
Note that a STATUS register read clears all of the bits to 0.
Table 28. STATUS Register Definition
Address
Default
Format
0x3D, 0x3C 0x0000
N/A
Access
Read-only
Table 29. STATUS Bit Descriptions
Bit Description
15:10 Not used
9
Alarm 2 status
1 = active, 0 = inactive
8
Alarm 1 status
1 = active, 0 = inactive
7:6 Not used
5
Self-test diagnostic error flag
1 = error condition, 0 = normal operation
4
Angular rate over range
1 = error condition, 0 = normal operation
3
SPI communications failure
1 = error condition, 0 = normal operation
2
Control register update failed
1 = error condition, 0 = normal operation
1
Power supply above 5.25 V
1 = above 5.25 V, 0 = below 5.25 V (normal)
0
Power supply below 4.75 V
1 = below 4.75 V, 0 = above 4.75 V (normal)
Rev. PrA | Page 16 of 19
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