ADIS16227 데이터 시트보기 (PDF) - Analog Devices

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ADIS16227

Digital Triaxial Vibration Sensor with FFT Analysis and Storage

Analog Devices 

ADIS16227

Data Sheet

DATA RECORDING AND SIGNAL PROCESSING

The ADIS16227 provides a number of registers for configuring

its data collection and signal processing operation (see Table 9).

Figure 13 provides a signal flow diagram, which describes many

of these settings.

Table 9. Sampling/Signal Processing Register Summary

Register

Address Description

X_NULL

0x02

X-axis offset correction

Y_NULL

0x04

Y-axis offset correction

For example, set DIO_CTRL[7:0] = 0x2F (DIN = 0xB62F) to

configure DIO2 as a positive external trigger input and

maintain the DIO1 factory default configuration as a positive

busy indicator. In manual mode, the start command triggers a

recording for an averaged FFT and stops after the recording is

complete. In automatic mode, the start command executes a

recording, and a timer continues to trigger recordings based on

the record period setting in REC_PRD (see Table 11).

Z_NULL

0x06

Z-axis offset correction

Table 11. REC_PRD Register Bit Descriptions

REC_FLSH_CNT

FFT_AVG

REC_CNTR

REC_CTRL

REC_PRD

E GLOB_CMD

0x08

0x0E

0x1A

0x1C

0x1E

0x3E

Record, flash write cycle counter

Record, FFT averages

Record, counter

Record, data processing

Record, automatic mode period

Trigger, record commands

The record control register is REC_CTRL (see Table 10), which

provides external controls for sample rates, dynamic range,

T record storage, recording mode, and power management.

Table 10. REC_CTRL Bit Descriptions

Bits Description (Default = 0x1130)

E [15:14] Not used

[13:12] Window setting:

00 = rectangular, 01 = Hanning, 10 = flat top, 11 = N/A

L [11] SR3, fs ÷ 512 (1 = enabled for analysis)

[10] SR2, fs ÷ 64 (1 = enabled for analysis)

[9]

SR1, fs ÷ 8 (1 = enabled for analysis)

[8]

SR0, fs (1 = enabled for analysis)

O [7]

Power-down between each recording (1 = enabled)

[6]

Not used

[5:4] Signal range:

00 = 0 g to 1 g, 01 = 0 g to 5 g, 10 = 0 g to 20 g, 11 = 0 g

S to 70 g

[3:2] Storage method:

00 = none, 01 = alarm trigger, 10 = all, 11 = N/A

[1:0] Recording mode:

B 00 = manual, 01 = automatic, 10 = manual time, 11 = N/A

RECORDING MODES

O REC_CTRL[1:0] provides three modes for triggering: (1) manual,

Bits

[15:10]

[9:8]

[7:0]

Description (Default = 0x0000)

Not used

Scale for data bits

00 = 1 second/LSB

01 = 1 minute/LSB

10 = 1 hour/LSB

Data bits, binary format, range = 0 to 255

RECORDING TIMES

The automatic recording period (REC_PRD) must be greater

than the total recording time. Use the following equations to

calculate the recording time:

Manual time mode

TR = TS + TPT + TST + TAST

FFT modes

( ) TR = N F × TS + TPT + TFFT + TST + TAST

The storage time (TST) applies only when a storage method is

selected in REC_CTRL[3:2]. See Table 10 for more details on

the record storage setting. The alarm scan time (TAST) applies

only when the alarms are enabled in ALM_CTRL[4:0]. See

Table 22 for more details on enabling the alarms.

Table 12. Available Records

Function

Sample Time, TS

Processing Time, TPT

FFT Time, TFFT

Number of FFT Averages, NF

Storage Time, TST

Time (ms)

See Table 15

10.4

26.6

See Table 19

120.0

(2) automatic, and (3) manual time domain. The manual and

Alarm Scan Time, TAST

2.21

automatic modes produce FFT events, which include data

collection, filtering, windowing, FFT analysis, and record

storage (if selected). The manual time domain mode produces

time-domain data in the buffer. All three modes require an

external trigger, using either the SPI interface or one of the

auxiliary digital I/O lines, DIO1 or DIO2. For the SPI external

trigger option, set GLOB_CMD[11] = 1 (DIN = 0x3F08). For

the digital I/O option, use the DIO_CTRL register (see

Table 59) to configure either DIO1 or DIO2 as an external

trigger input.

Rev. B | Page 10 of 24

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