ADXRS453 Analog Devices, ADXRS453 Datasheet - Page 14

• Manufacturer Part Number: ADXRS453
• Description: High Performance / Digital Output Gyroscope
• Manufacturer: Analog Devices

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ADXRS453
SPI COMMUNICATION PROTOCOL
COMMAND/RESPONSE
Input/output is handled through a 32-bit command/response
SPI interface. With the command/response SPI interface, the
response to a command is issued during the next sequential
SPI exchange (see Figure 29).
The format for the interface is defined as follows:
Table 9 shows the commands that can be sent from the master
device to the gyroscope. Table 10 shows the responses to these
commands from the gyroscope. For descriptions of the bits in
the commands and responses, see the Command/Response Bit
Definitions section and the Fault Register Bit Definitions
section.
Table 9. SPI Commands
Command 31 30
Sensor
Data
Read
Write
Table 10. SPI Responses
Command 31 30 29 28 27 26 25 24 23
Sensor
Data
Read
Write
R/W Error 0
SCLK
MOSI
MISO
CS
Clock Phase = Clock Polarity = 0
SQ2 SQ1 SQ0 P0 ST1 ST0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1
0
0
SQ1 SQ0 1
1
0
0
29 28
0
0
0
1
0
P0 1
P0 1
P0 1
SQ2
SM2 SM1 SM0 A8 A7 A6 A5
SM2 SM1 SM0 A8 A7 A6 A5
27
1
1
1
RESPONSE N – 1
26
COMMAND N
32 CLOCK
CYCLES
1
1
1
25 24 23 22
0
0
0
SM2 SM1 SM0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6
SM2 SM1 SM0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6
SM2 SM1 SM0 0
22
21
A4
A4
21
20
A3 A2 A1 A0
A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4
20 19 18 17 16 15 14 13 12 11
0
19
Figure 29. SPI Protocol
Rev. 0 | Page 14 of 32
18 17 16 15 14 13 12 11 10 9
SPI RE
DU
Bit
Bit
The device response to the initial command is 0x00000001.
This response prevents the transmission of random data to the
master device upon the initial command/response exchange.
The SPI interface uses the ADXRS453 pins described in Table 8.
Table 8. SPI Signals
Signal
Serial Clock
Chip Select
Master Out/
Slave In
Master In/
Slave Out
Pin
SCLK
CS
MOSI
MISO
10
D0
D5
D5
Description
Exactly 32 clock cycles during CS active
Active low chip select pin
Input for data sent to the gyroscope
(slave) from the main controller (master)
Output for data sent to the main controller
(master) from the gyroscope (slave)
9
D4 D3 D2 D1 D0
D4 D3 D2 D1 D0
COMMAND N + 1
RESPONSE N
32 CLOCK
CYCLES
8
8
7
PLL Q NVM POR PWR CST CHK P1
PLL Q NVM POR PWR CST CHK P1
7
6
6
5
5
4
D3
4
3
D2
3
2
D1 D0 P
2
1
CHK P
1
0
P
0
P1
P1