ADIS16255/PCBZ Analog Devices Inc, ADIS16255/PCBZ Datasheet - Page 17

• Manufacturer Part Number: ADIS16255/PCBZ
• Description: BOARD EVAL FOR ADIS16255
• Manufacturer: Analog Devices Inc
• Series: iMEMS®, iSensor™r

Specifications of ADIS16255/PCBZ

• Sensor Type: Gyroscope, 1 Axis (Yaw Rate)
• Sensing Range: ±80°/sec, ±160°/sec, ±320°/sec
• Interface: SPI Serial
• Sensitivity: 0.018°/sec/LSB
• Voltage - Supply: 4.75 V ~ 5.25 V
• Embedded: No
• Utilized Ic / Part: ADIS16255
• For Use With: ADISUSBZ - KIT EVAL ADIS W/SOFTWARE USBADISEVALZ - KIT PC EVALUATION W/SOFTWARE
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Data-Ready I/O Indicator
The data-ready function provides an indication of updated
output data. The MSC_CTRL register provides the opportu-
nity 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
0x35, 0x34
Table 27. MSC_CTRL Bit Descriptions
Bit
15:11
10
9
8
7:3
2
1
0
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 appropri-
ate control bit, the GYRO_OUT register reflects the changes
after a delay that reflects the sensor signal chain response time.
Description
Not used
Internal self-test enable
External negative rotation self-test enable
External positive rotation self-test enable
Not used
Data-ready enable
Data-ready polarity
Data-ready line select
1 = enabled
0 = disabled
1 = enabled
0 = disabled
1 = enabled
0 = disabled
1 = enabled
0 = disabled
1 = active high
0 = active low
1 = DIO1
0 = DIO0
Default
0x0000
Format
N/A
Access
R/W
Rev. D | Page 17 of 20
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
0x3D, 0x3C
Table 29. STATUS Bit Descriptions
Bit
15:10
9
8
7:6
5
4
3
2
1
0
Description
Not used
Alarm 2 status
Alarm 1 status
Not used
Self-test diagnostic error flag
Angular rate over range
SPI communications failure
Control register update failed
Power supply above 5.25 V
Power supply below 4.75 V
1 = active
0 = inactive
1 = active
0 = inactive
1 = error condition
0 = normal operation
1 = error condition
0 = normal operation
1 = error condition
0 = normal operation
1 = error condition
0 = normal operation
1 = above 5.25 V
0 = below 5.25 V (normal)
1 = below 4.75 V
0 = above 4.75 V (normal)
Default
0x0000
ADIS16250/ADIS16255
Format
N/A
Access
Read-only