AS5403D-HTST datasheet(34/66 Pages) AMSCO

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[v1-06] 2015-Aug-28

AS5403A/D/E − Programming the AS5403

Programming Procedure

The EEPROM programming is possible over the SPI or UART

interface. A page write/read mode with 64 pages 8 words each

is implemented.

Figure 40:

Page Mode Address

Page Write mode procedure:

Write 0x00 on address 0x2FF (START DSP = 0)

Write the EEPROM words (SPI/UART) inside a page

(min 1 max 8 words)

Write 0x0003 on address 0x2FF (CFG_EPP=11)

Wait for 10 ms

Repeat from 2. for further programming.

It is important that the write access to the selected EEPROM

page are consecutive: a write command in a different page or

a read command before writing CFG_EPP will delete the data.

A writing to factory reserved area will be ignored.

After programming it is mandatory to read back the EEPROM

content and to download again the EEPROM to avoid

misalignment with the mirror registers. This can be done with

a power up or writing 0x0004 on address 0x2FF

(EE_DWNL SFR).

The programming procedure is not allowed in case Customer

Lock word is 0x55AA after EEPROM download (mask_fuse=1).

Lock Procedure and Signature Calculation

The AS5403 contains a signature diagnostic function for the

EEPROM. This signature is calculated in the AS5403 during

power up and is compared to the calculated signature directly

after the end of line calibration by the customer. A deviation

leads to an error indication in the diagnostic flag or into the

failure band mode at the output. The signature check is enabled

in case of a locked device by the user.

Address

Page

0x000 - 0x007

0x008 - 0x00F

0x1F8 - 0x1FF

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