AS5403D-HTST datasheet(30/66 Pages) AMSCO

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[v1-06] 2015-Aug-28

AS5403A/D/E − Programming the AS5403

A standard half duplex UART protocol is used to exchange data

with the device in the communication mode.

UART Interface for Programming

The AS5403 uses a standard UART interface with two bytes for

address and two bytes for the data content. The read or write

mode is selected in the first byte. An even parity for every byte

is included. The timing (baud-rate) is selected by the AS5403

over an initial command from the master. The baud rate register

can be read and overwritten. The keep synchronization it

AS5403 synchronizes art every Start bit. This happens during a

standard write access 3 times. A time out function detects not

complete commands and resets the AS5403 UART after the

timeout period.

Figure 33:

Valid Commands

In case of Write command the request is followed by the frames

containing the data to write.In case of Read command the

communication direction will change and the device will

answer with the frames containing the data requested.

Frame Organization

The UART frame consists of 1 start bit (low level), 8 data bit, 1

even-parity bit and 1 stop bit (high level). Data are transferred

from LSB to MSB.

Figure 34:

General UART Frame

CMD Name

Description

AS5403 Communication Mode

Write

Write data in the EEPROM/ SFR memory

SLAVE

Read

Read data from the EEPROM/ SFR memory

SLAVE/MASTER

Programming the AS5403

par

start

stop

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