ADIS16300/PCBZ Analog Devices Inc, ADIS16300/PCBZ Datasheet - Page 12

• Manufacturer Part Number: ADIS16300/PCBZ
• Description: BOARD EVAL ADIS16300
• Manufacturer: Analog Devices Inc
• Type: Accelerometerr

Specifications of ADIS16300/PCBZ

• Contents: Evaluation Board
• For Use With/related Products: ADIS16300
• For Use With: ADISUSBZ - KIT EVAL ADIS W/SOFTWARE USB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADIS16300
Restoring Factory Calibration
Set GLOB_CMD[1] = 1 (DIN = 0xBE02) to execute this function,
which resets each user calibration register (see Table 10 and
Table 11) to 0x0000, resets all sensor data to zero, and auto-
matically updates the flash memory (50 ms). See Table 12.
Linear Acceleration Bias Compensation (Gyroscope)
Set MSC_CTRL[7] = 1 (DIN = 0xB486) to enable correction for
low frequency acceleration influences on gyroscope bias. Note
that the DIN sequence also preserves the factory default condi-
tion for the data ready function (see Table 17).
OPERATIONAL CONTROL
Global Commands
The GLOB_CMD register provides trigger bits for several useful
functions. Setting the assigned bit to 1 starts each operation,
which returns to the bit to 0 after completion. For example, set
GLOB_CMD[7] = 1 (DIN = 0xBE80) to execute a software
reset, which stops the sensor operation and runs the device
through its start-up sequence. This includes loading the control
registers with their respective flash memory locations prior to
producing new data. Reading the GLOB_CMD registers (DIN =
0x3E00) starts the burst mode read sequence.
Table 12. GLOB_CMD
Bits
[15:8]
[7]
[6:5]
[4]
[3]
[2]
[1]
[0]
Internal Sample Rate
The ADIS16300 performs best when the sample rate is set to the
factory default setting of 819.2 SPS. For applications that value
lower sample rates, the SMPL_PRD register controls the
ADIS16300 internal sample (see Table 13), and the following
relationship produces the sample rate:
Table 13. SMPL_PRD
Bit
[15:8]
[7]
[6:0]
t
S
= t
Description
Not used
Software reset command
Not used
Precision autonull command
Flash update command
Auxiliary DAC data latch
Factory calibration restore command
Autonull command
Description
Not used
Time base (t
0 = 0.61035 ms, 1 = 18.921 ms
Increment setting (N
Internal sample period = t
B
× N
S
+ 1
B
)
S
)
S
= t
B
× N
S
+ 1
Rev. A | Page 12 of 16
For example, set SMPL_PRD[7:0] = 0x0A (DIN = 0xB60A) for
an internal sample period of 6.7 ms (sample rate = 149 SPS).
For systems that value lower sample rates, in-system character-
ization can help determine performance trade-offs.
Power Management
Setting SMPL_PRD ≥ 0x0A also sets the sensor in low power
mode. In addition to sensor performance, this mode also affects
SPI data rates (see Table 2). Two sleep mode options are listed
in Table 14. Set SLP_CNT[8] = 1 (DIN = 0xBB01) to start the
indefinite sleep mode, which requires CS assertion (high to
low), reset, or power cycle to wake-up. Set SLP_CNT[7:0] =
0x64 (DIN = 0xBA64) to put the ADIS16300 to sleep for 100
seconds, as an example of the programmable sleep time option.
Table 14. SLP_CNT
Bit
[15:9]
[8]
[7:0]
Digital Filtering
The signal conditioning circuit of each sensor has a typical
analog bandwidth of 350 Hz. A programmable Bartlett window
FIR filter provides an opportunity for additional noise reduction
on all output data registers. SENS_AVG[2:0] controls the
number of taps according to the equation in Table 15. For
example, set SENS_AVG[2:0] = 110 (DIN = 0xB806) to
establish a 129-tap setting.
–100
–120
–140
–20
–40
–60
–80
0.001
0
Description
Not used
Indefinite sleep mode, set to 1
Programmable time bits, 0.5 sec/LSB
Figure 15. Bartlett Window FIR Frequency Response
N = 5
N = 9
N = 33
N = 129
0.01
FREQUENCY (
f
/
f
S
)
0.1
1