ADIS16367/PCBZ Analog Devices Inc, ADIS16367/PCBZ Datasheet - Page 13

• Manufacturer Part Number: ADIS16367/PCBZ
• Description: ADIS16367/PCB EVAL. BD. PB Free
• Manufacturer: Analog Devices Inc
• Series: iMEMS®, iSensor™r

Specifications of ADIS16367/PCBZ

• Sensor Type: Accelerometer, Gyroscope, 3 Axis
• Sensing Range: ±18g, ±300°/sec, ±600°/sec, ±1200°/sec
• Sensitivity: 3.33mg/LSB, 0.05 ~ 0.2°/sec/LSB
• Voltage - Supply: 4.75 V ~ 5.25 V
• Embedded: No
• Utilized Ic / Part: ADIS16367
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -
• Lead Free Status / Rohs Status: Compliant

Internal Sample Rate
The SMPL_PRD register provides discrete sample rate settings
using the bit assignments in Table 18 and the following equation:
For example, when SMPL_PRD[7:0] = 0x0A, the sample rate is
149 SPS.
Table 18. SMPL_PRD Bit Descriptions
Bits
[15:8]
[7]
[6:0]
The default sample rate setting of 819.2 SPS preserves the sensor
bandwidth and provides optimal performance. For systems that
value slower sample rates, keep the internal sample rate at
819.2 SPS. Use the programmable filter (SENS_AVG) to reduce
the bandwidth, which helps to prevent aliasing. The data-ready
function (MSC_CTRL) can drive an interrupt routine that uses
a counter to help ensure data coherence at the reduced rates.
Power Management
Setting SMPL_PRD ≥ 0x0A also sets the sensor to low power
mode. For systems that require lower power dissipation, in-
system characterization helps users to quantify the associated
performance trade-offs. In addition to sensor performance, this
mode affects SPI data rates (see Table 2). Set SLP_CNT[8] = 1
(DIN = 0xBB01) to start the indefinite sleep mode, which requires
a CS assertion (high to low), reset, or power cycle to wake up.
Use SLP_CNT[7:0] to put the device into sleep mode for a
specified period. For example, SLP_CNT[7:0] = 0x64
(DIN = 0xBA64) puts the ADIS16367 to sleep for 50 sec.
Table 19. SLP_CNT Bit Descriptions
Bits
[15:9]
[8]
[7:0]
Sensor Bandwidth
The signal chain for each MEMS sensor has several filter stages,
which shape their frequency response. Figure 14 provides a
block diagram for both gyroscope and accelerometer signal
paths. Table 20 provides additional information for digital filter
configuration.
GYROSCOPE
SENSOR
ACCELERATION
t
S
FROM
= t
B
Description
Not used
Indefinite sleep mode; set to 1
Programmable sleep time bits, 0.5 sec/LSB
Description (Default = 0x0001)
Not used
Time base (t
0 = 0.61035 ms, 1 = 18.921 ms
Increment setting (N
Internal sample period = t
SENSOR
× (N
FROM
Figure 14. MEMS Analog and Digital Filters
404Hz
S
LPF
+ 1)
B
)
757Hz
330Hz
LPF
LPF
S
)
S
= t
B
× (N
S
N = 2
m = SENS_AVG[2:0]
N
N
+ 1)
m
N
N
Rev. A | Page 13 of 20
Digital Filtering
The N blocks in Figure 14 are part of the programmable low-pass
filter, which provides additional noise reduction on the inertial
sensor outputs. This filter contains two cascaded averaging filters
that provide a Bartlett window, FIR filter response (see Figure 15).
For example, set SENS_AVG[2:0] = 100 (DIN = 0xB804) to set
each stage to 16 taps. When used with the default sample rate
of 819.2 SPS, this value reduces the sensor bandwidth to
approximately 16 Hz.
Dynamic Range
The SENS_AVG[10:8] bits provide three dynamic range settings
for this gyroscope. The lower dynamic range settings (±300°/sec
and ±600°/sec) limit the minimum filter tap sizes to maintain
resolution. For example, set SENS_AVG[10:8] = 010 (DIN =
0xB902) for a measurement range of ±600°/sec. Because this
setting can influence the filter settings, program SENS_AVG[10:8]
and then SENS_AVG[2:0] if more filtering is required.
Table 20. SENS_AVG Bit Descriptions
Bits
[15:11]
[10:8]
[7:3]
[2:0]
–100
–120
–140
–20
–40
–60
–80
Figure 15. Bartlett Window, FIR Filter Frequency Response
0.001
0
Description (Default = 0x0402)
Not used
Measurement range (sensitivity) selection
100 = ±1200°/sec (default condition)
010 = ±600°/sec, filter taps ≥ 4 (Bits[2:0] ≥ 0x02)
001 = ±300°/sec, filter taps ≥ 16 (Bits[2:0] ≥ 0x04)
Not used
Number of taps in each stage; value of m in N = 2
N = 2
N = 4
N = 16
N = 64
(Phase Delay = N Samples)
0.01
FREQUENCY (Ratio)
0.1
ADIS16367
1
m