HAL-APB-V1.5 Datasheet, PDF (30/59 Pages) Micronas – Application Board HAL-APB V1.x

HAL1820, HAL24xy, HAL28xy, HAL36xy, HAL38xy
Application Board HAL-APB V1.x
8.6. Locking of the Sensor
APPLICATION NOTE
For reliability in service, it is mandatory to set the LOCK bit after final adjustment and
programming.
The success of the LOCK process should be checked by reading the status of the
LOCK bit after locking.
It is also mandatory to check the status of the received data or to read/check the status
of the DIAGNOSIS register after each store sequence to verify if the programming of
the sensor was successful. VER, PER and OVP (bits <2:0>) should be 0 after each set/
erase command. NVE (bit 11) should be 0 only after enough succesive set or erase
command (after 10 erase or 10 set).
Electro-static discharges (ESD) may disturb the supply voltage during programming.
Please take precautions against ESD.
For the programming during product development and also for production purposes, a
programming tool including hardware and software is available on request. It is recom-
mended to use the Micronas tool kit for an easy product development. It is also recom-
manded for production to always first program the “0” (erase command) the the “1” (set
command).
Note: It is possible to read the registers of the HAL 1820 after locking. Changing of the
memory after locking is not possible.
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Oct. 8, 2012; APN000055_003EN
Micronas