HAL855UT-K datasheet(40/42 Pages) MICRONAS

40 / 42 page

HAL855

DATA SHEET

Nov. 26, 2008; DSH000149_003EN

Micronas

5.6. Programming Information

If the content of any register is to be changed, the

desired value must first be written into the correspond-

ing RAM register. Before reading out the RAM register

again, the register value must be permanently stored

in the EEPROM.

Permanently storing a value in the EEPROM is done

by first sending an ERASE command followed by

sending a PROM command and a read command. The

address within the ERASE and PROM commands is

not important. ERASE and PROM act on all registers

in parallel.

If all HAL855 registers are to be changed, all writing

commands can be sent one after the other, followed by

sending one ERASE and PROM command at the end.

During all communication sequences, the customer

has to check if the communication with the sensor was

successful. This means that the acknowledge and the

parity bits sent by the sensor have to be checked by

the customer. If the Micronas programmer board is

used, the customer has to check the error flags sent

from the programmer board. It is recommended to use

the programmer board version 5.1.

Further information for the programming of the sensor

can be found in the application note for the program-

mer board.

Note: For production and qualification tests, it is man-

datory to set the LOCK bit after final adjustment

and programming of HAL855. The LOCK func-

tion is active after the next power-up of the sen-

sor.

The success of the LOCK process should be

checked by reading at least one sensor register

after locking and/or by an analog check of the

sensors output signal.

Electrostatic Discharges (ESD) may disturb the

programming pulses. Please take precautions

against ESD.

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