ADIS16255/PCBZ Analog Devices Inc, ADIS16255/PCBZ Datasheet - Page 16

• 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

ADIS16250/ADIS16255
Dynamic Range
The ADIS16250/ADIS16255 provide three dynamic range
settings: ±80°/sec, ±160°/sec, and ±320°/sec. The lower
dynamic range settings (80, 160) limit the minimum filter
tap sizes in order to maintain the resolution as the maximum
rate measurements decrease. The recommended order for
programming the SENS/AVG register is (1) dynamic range
and then (2) filtering response. The contents of the
SENS/AVG register are nonvolatile.
Table 19. SENS/AVG Register Definition
Address
0x39, 0x38
Table 20. SENS/AVG Bit Descriptions
Bit
15:11
10:8
7:4
3:0
Auxiliary DAC
The auxiliary DAC provides a 12-bit level adjustment
function. The AUX_DAC register controls the operation of
this feature. It offers a rail-to-rail buffered output that has a
range of 0 V to 2.5 V. The DAC can drive its output to within
5 mV of the ground reference when it is not sinking current.
As the output approaches ground, the linearity begins to
degrade (100 LSB beginning point). As the sink current
increases, the nonlinear range increases. The DAC output
latch function, contained in the COMMAND register,
provides continuous operation while writing each byte of
this register. The contents of this register are volatile, which
means that the desired output level must be set after every
reset and power cycle event.
Table 21. AUX_DAC Register Definition
Address
0x31, 0x30
Table 22. AUX_DAC Bit Descriptions
Bit
15:12
11:0
Value
100
010
001
Description
Not used
Data bits
Default
0x0402
Description
Not used
Sensitivity selection bits
320°/sec (default condition)
160°/sec, filter taps ≥ 4 (Bits[3:0] ≥ 0x02)
80°/sec, filter taps ≥16 (Bits[3:0] ≥ 0x04)
Not used
Filter tap setting, M = binary number
(number of taps, N = 2
Default
0x0000
Format
Binary
Format
Binary
M
)
Access
R/W
Access
R/W
Rev. D | Page 16 of 20
General-Purpose I/O
The ADIS16250/ADIS16255 provide two general-purpose pins
that enable digital I/O control using the SPI. The GPIO_CTRL
control register establishes the configuration of these pins and
handles the SPI-to-pin controls. Each pin provides the flexibility of
both input (read) and output (write) operations. For example,
writing a 0x0202 to this register establishes Line 0 as an output and
sets its level as a one. Writing 0x0000 to this register establishes both
lines as inputs, and their status can be read through Bit 0 and Bit 1
of this register.
The digital I/O lines are also available for data-ready and alarm/error
indications. In the event of conflict, the following priority structure
governs the digital I/O configuration:
1.
2.
3.
Table 23. GPIO_CTRL Register Definition
Address
0x33, 0x32
Table 24. GPIO_CTRL Bit Descriptions
Bit
15:10
9
8
7:2
1
0
STATUS AND DIAGNOSTICS
The ADIS16250/ADIS16255 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
MSC_CTRL
ALM_CTRL
GPIO_CTRL
Description
Not used
General-purpose I/O Line 1 polarity
General-purpose I/O Line 0 polarity
Not used
General-purpose I/O Line 1, data direction control
General-purpose I/O Line 0, data direction control
1 = high
0 = low
1 = high
0 = low
1 = output
0 = input
1 = output
0 = input
Default
0x0000
Format
N/A
Register
MSC_CTRL
STATUS
ENDURANCE
ALM_MAG1/2
ALM_SMPL1/2
ALM_CTRL
MSC_CTRL
Access
R/W