ADIS16251/PCBZ Analog Devices Inc, ADIS16251/PCBZ Datasheet - Page 16

• Manufacturer Part Number: ADIS16251/PCBZ
• Description: BOARD EVALUATION FOR ADIS16251
• Manufacturer: Analog Devices Inc
• Series: iMEMS®, iSensor™r

Specifications of ADIS16251/PCBZ

• Sensor Type: Gyroscope, 1 Axis
• Sensing Range: ±20°/sec, ±40°/sec, ±80°/sec
• Interface: SPI Serial
• Sensitivity: 0.004°/sec/LSB
• Voltage - Supply: 4.75 V ~ 5.25 V
• Embedded: No
• Utilized Ic / Part: ADIS16251
• Silicon Manufacturer: Analog Devices
• Application Sub Type: Angular Rate Sensor / Gyroscope
• Kit Application Type: Sensing - Motion / Vibration / Shock
• Silicon Core Number: ADIS16251
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: ADISUSBZ - KIT EVAL ADIS W/SOFTWARE USBADISEVALZ - KIT PC EVALUATION W/SOFTWARE
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADIS16251
Dynamic Range
The ADIS16251 provides three dynamic range settings:
±20°/sec, ±40°/sec, and ±80°/sec. The lower dynamic range
settings (±20°/sec, ±40°/sec) limit the minimum filter tap
sizes in order to maintain the resolution as the maximum rate
measurements decrease. The recommended order for pro-
gramming the SENS/AVG register is (1) dynamic range and
(2) filtering response. The contents of the SENS/AVG register
are nonvolatile.
Table 18. SENS/AVG Register Definition
Address
0x39, 0x38
Table 19. 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 ref-
erence when it is not a 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.
–100
–120
–140
–160
–20
–40
–60
–80
Value
100
010
001
0.001
0
Figure 19. Bartlett Window FIR Frequency Response
Default
0x0402
Description
Not used
Sensitivity selection bits
80°/sec (default condition)
40°/sec, filter taps ≥ 4 (Bits [3:0] ≥ 0x02)
20°/sec, filter taps ≥16 (Bits [3:0] ≥ 0x04)
Not used
Filter tap setting, M = binary number
(number of taps, N = 2
N = 128
0.01
FREQUENCY (f/fs)
N = 16
Format
Binary
M
N = 4
)
0.1
Access
R/W
N = 2
1
Rev. A | Page 16 of 16
Table 20. AUX_DAC Register Definition
Address
0x31, 0x30
Table 21. AUX_DAC Bit Descriptions
Bit
15:12
11:0
General-Purpose I/O
The ADIS16251 provides 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 2 as an output and sets
its level as a 1. 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:
•
•
•
Table 22. GPIO_CTRL Register Definition
Address
0x33, 0x32
Table 23. GPIO_CTRL Bit Descriptions
Bit
15:10
9
8
7:2
1
0
MSC_CTRL
ALM_CTRL
GPIO_CTRL
Description
Not used
General-purpose I/O Line 2 polarity
General-purpose I/O Line 1 polarity
Not used
General-purpose I/O Line 2, data direction control
General-purpose I/O Line 1, data direction control
1 = high
0 = low
1 = high
0 = low
1 = output
0 = input
1 = output
0 = input
Description
Not used
Data bits
Default
0x0000
Default
0x0000
Format
N/A
Format
Binary
Access
R/W
Access
R/W