SAP51D-A-G1-R datasheet(23/62 Pages) ZMD

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SAP5S / SAP51

Universal Actuator-Sensor Interface IC

Data Sheet

July 17, 2012

the prior written consent of the copyright owner. The information furnished in this publication is PRELIMINARY and subject to

changes without notice.

23 of 62

3.2. User Area Programming

User Area data can be written by an ADRA or WID1 master request (refer to Table 6). Any such write access

is accompanied by two write steps to the Security_Flag, one before and one after the actual modification of

user data.

The following procedure is executed when writing to the User Area of the E²PROM:

The Security_Flag is programmed to ‘1’.

The content of the Security_Flag is read back, verifying it was programmed to ‘1’.

The user data is modified.

A read back of the written data is performed.

If the read back has proven successful programming of the user data, the

Security_Flag is programmed back to ‘0’.

The content of the Security_Flag is read back, verifying it was programmed to ‘0’.

Successful execution of the E²PROM write procedure may be observed at the status register contents. If bit

S0 is set (logic HIGH) the write process is not finished yet and the programming data is still volatile. If bit S3

(equals the Security_Flag) is set, the write procedure did not successfully complete either because the write

cycle was interrupted or due to an internal error. In order to program the data correctly the write request

should be repeated. The status register can be read using the AS-i Master call Read_Status (RDST).

In addition to a read out of the data areas, the Security_Flag of the E²PROM is also read and evaluated during

IC initialization. In case the value of the Security_Flag equals ‘1’ (i.e. due to an undesired interruption of a

User Area write access), the entire User Area data is treated as corrupted. The IC returns to Slave Address

“0” and the ID_Code as well as the IO_Code are set to 0xF. Consequently, the programming of the User Area

data can be repeated.

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