ADIS16COM1SLASHPCBZ datasheet(26/37 Pages) AD

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ADIS16000/ADIS16229

Preliminary Technical Data

Rev. PrA | Page 26 of 37

READING OUTPUT DATA

After the ADIS16229 updates the ADIS16000 with its data, it is

available in the data buffer and FFT records (if selected). In

manual time capture mode, the record for each axis contains 512

samples. In manual and automatic FFT mode, each record

contains the 256-point FFT result for each accelerometer axis.

Table 56 provides a summary of registers that provide access to

processed sensor data.

Table 56. Output Data Registers

Address

Description

TEMP_OUT

0x0A

Internal temperature

SUPPLY_OUT

0x0C

Internal power supply

BUF_PNTR

0x12

Data buffer index pointer

REC_PNTR

0x14

FFT record index pointer

X_BUF

0x06

X-axis accelerometer buffer

Y_BUF

0x08

Y- axis accelerometer buffer

GLOB_CMD

0x36

FFT record retrieve command

TIME_STAMP_L

0x40

Time stamp, lower word

TIME_STAMP_H

0x42

Time stamp, upper word

REC_INFO1

0x4C

FFT record header information

REC_INFO2

0x4E

FFT record header information

READING DATA FROM THE DATA BUFFER

After completing a spectral record and updating each data

buffer, the ADIS16000 loads the first data sample from each

data buffer into the x_BUF registers (see Table 59 and Table 60)

and sets the buffer index pointer in the BUF_PNTR register

(see Table 57) to 0x0000. The index pointer determines which

data samples load into the x_BUF registers. For example, writing

0x009F to the BUF_PNTR register (DIN = 0x9300, DIN =

0x929F) causes the 160th sample in each data buffer location to

load into the x_BUF registers. The index pointer increments

with every x_BUF read command, which causes the next set of

capture data to load into each capture buffer register

automatically. This enables an efficient method for reading all

256 samples in a record, using sequential read commands,

without having to manipulate the BUF_PNTR register.

Figure 21. Data Buffer Structure and Operation

Table 57. BUF_PNTR

Page 1-6, Low Byte Address =10, Read/Write

Bits

Description (Default = 0x0000)

[15:9]

Not used

[8:0]

Data bits; range = 0 to 255 (FFT), 0 to 511 (time)

ACCESSING FFT RECORD DATA

The FFT records can be stored in flash memory. The REC_PNTR

provide access to the FFT records, as shown in Figure 22. For

example, set REC_PNTR[7:0] = 0x0A (DIN = 0x940A) and

GLOB_CMD[13] = 1 (DIN = 0xB720) to load FFT Record 10 in

the FFT buffer for SPI/register access.

Table 58. REC_PNTR

Page 1-6, Low Byte Address = 0x14, Read/Write

Bits

Description (Default = 0x0000)

[15:4]

Not used

[3:0]

Data bits

Figure 22. FFT Record Access

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