ADIS16265 Просмотр технического описания (PDF) - Analog Devices

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ADIS16265

Programmable Digital Gyroscope Sensor

Analog Devices 

Data Sheet

SPI WRITE COMMANDS

Master processors write to the control registers, one byte

at a time, using the bit sequence shown in Figure 11. Some

configurations require writing both bytes to a register, which

takes two separate 16-bit sequences, whereas others require

only one byte. The programmable registers in Table 7 provide

controls for optimizing sensor operation and for starting vari-

ous automated functions. For example, to start an automatic

bias null sequence, set GLOB_CMD[0] = 1 by writing 0xBE01

to the SPI transmit register of the master processor, which feeds

the DIN line. The process starts immediately after the last bit

clocks into DIN (16th SCLK rising edge).

CS

SCLK

DIN

Figure 12. SPI Sequence for Autonull (DIN = 0xBE01)

ADIS16260/ADIS16265

SPI READ COMMANDS

Reading data through the SPI requires two consecutive 16-bit

sequences, separated by an appropriate stall time (see Figure 2).

The first sequence transmits the read command and address on

DIN, and the second receives the resulting data from DOUT. The

7-bit register address can represent either the upper or lower byte

address for the target register. For example, when reading the

GYRO_OUT register, the address can be either 0x04 or 0x05.

Figure 13 provides a full-duplex mode example of reading the

GYRO_OUT register. In addition, the second SPI segment sets

the device up to read TEMP_OUT on the following SPI segment

(not shown in Figure 13).

CS

SCLK

DIN

SPI SEGMENT 1

SPI SEGMENT 2

DOUT

DIN = 0x0400 PRODUCES GYRO_OUT CONTENTS ON

DOUT DURING THE NEXT SPI SEGMENT

DOUT = 0x822B = 21.9047°/sec, NEW DATA, NO ALARM

Figure 13. Example SPI Read Sequence (±320°/sec Range Setting)

Rev. D | Page 11 of 20

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