AS5403D-HTST datasheet(28/66 Pages) AMSCO

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[v1-06] 2015-Aug-28

AS5403A/D/E − 4-Wire Serial Peripheral Inter face (SPI)

AS5403 is equipped with a 4wire serial peripheral interface (SPI)

to access the EEPROM memory and the read /write registers.

SCS input pin (active high) selects the device for serial transfers.

pin or shifted out from the device on the SDO pin on each

subsequent SCLK, in both the cases MSB first. Data are captured

on the rising edge and shifted on the falling edge of SCLK for

receiving command and transmitting command. An even parity

bit is used to check the consistency of the frame. SPI protocol

is built by frames; each frame is composed by 4 bytes and it is

detected only when SCS pin is high. If a frame contains a

number of bits different from the expected the command is not

executed.

Valid commands for the SPI interface are the following:

Figure 30:

Commands SPI

Write (0)

The first byte of the write command is composed by the

command identifier (CMD) the even parity bit (PAR) and the

MSBs of the address AD<10:8>.

The second byte of the command is the remaining part of the

address AD<7:0>, the third and the fourth byte contains the

data word we want to write (D<15:0>) on address AD<10:0>.

The device forces the SDO pin low. With this command it is

possible to access the EEPROM locations and the read/write

registers area.

Figure 31:

SPI Write

CMD Name

CMD

Value

Note

AS5403

Communication Mode

Write

Write data in the memory area

SLAVE

Read

Read data from the memory area

SLAVE/MASTER

4-Wire Serial Peripheral

Interface (SPI)

CMD

PAR

AD10

AD9

AD8

AD7

AD6

AD5

AD4

AD3

AD2

AD1

AD0

D15

D14

D13

D12

D11

D10

SDI

SDO

SCLK

SCS

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