ADIS16COM1SLASHPCBZ datasheet(16/37 Pages) AD

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ADIS16000/ADIS16229

Preliminary Technical Data

Rev. PrA | Page 16 of 37

SENSOR NODE RECORDING MODE/SIGNAL PROCESSING

The ADIS16229 provides a complete sensing system for recording

and monitoring vibration data. Figure 15 provides a simplified

block diagram for the signal processing associated with spectral

record acquisition on both axes (x and y). User registers provide

controls for data type (time or frequency), trigger mode (manual

or automatic), collection mode (real time or capture), sample

rates/filtering, windowing, FFT averaging, spectral alarms, and I/O

management.

RECORDING MODE

The recording mode selection establishes the data type (time or

frequency domain), trigger type (manual or automatic), and

data collection (captured or real time). The REC_CTRL1[1:0]

bits (see Table 27) provide four operating modes: manual FFT,

automatic FFT, manual time capture, and real time. After setting

REC_CTRL1, the manual FFT, automatic FFT, and manual time

capture modes require a start command to start acquiring a

spectral or time domain record. All of these modes automatically

trigger when the sensor receives the configuration packet from

the gateway. Set GLOB_CMD[11] = 1 to halt the operation and

wait for further instructions from the ADIS16000..

Table 27. REC_CTRL1

Page 1-6, Low Byte Address = 0x1A, Read/Write

Bits

Description (Default = 0x1100)

[15:14]

Not used (don’t care).

[13:12]

Window setting.

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

SR3, 1 = enabled for FFT, 0 = disable.

Sample rate = 20,000 ÷ 2AVG_CNT[15:12] (see Table 28).

SR2, 1 = enabled for FFT, 0 = disable.

Sample rate = 20,000 ÷ 2AVG_CNT[11:8] (see Table 28).

SR1, 1 = enabled for FFT, 0 = disable.

Sample rate = 20,000 ÷ 2AVG_CNT[7:4] (see Table 28).

SR0, 1 = enabled for FFT, 0 = disable.

Sample rate = 20,000 ÷ 2AVG_CNT[3:0] (see Table 28).

Power-down between each recording. 1 = enabled.

[6:4]

Not used (don’t care).

[3:2]

Storage method.

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

[1:0]

Recording mode.

00 = manual FFT, 01 = automatic FFT,

10 = manual time capture, 11 = real-time sampling/data

access.

Manual FFT Mode

Set REC_CTRL1[1:0] = 00 to place the device in manual FFT

mode, which will result in triggering a single FFT cycle. When

the spectral record is complete, the device will transmit the data

to the ADIS16000 and wait for another start command.

Automatic FFT Mode

Set REC_CTRL1[1:0] = 01 to place the device in automatic FFT

mode. Use the UPDAT_INT and INT_SCL registers to establish

the period between “wake-up times,” which triggers data

capture, FFT computation and analysis.

Manual Time Capture Mode

Set REC_CTRL1[1:0] = 10 to place the device into manual time

capture mode, which will result in triggering a single time

domain data capture. When the device is operating in this

mode, 512 samples of time domain data are loaded into the

buffer for each axis. This data goes through all time domain

signal processing, except the pre-FFT windowing, prior to

loading into the data buffer for user access. When the data

record is complete, the device will transmit the data to the

ADIS16000 and wait for another start command.

MEMS

ADC

PROCESSING

DATA

BUFFER

RECORDS

SPI AND

REGISTERS

Figure 15. Simplified Block Diagram

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