HAL880 datasheet(33/34 Pages) MICRONAS

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DATA SHEET

HAL880

Micronas

Feb. 23, 2009; DSH000152_001EN

5.6. Programming Information

If the content of any register (except the lock registers)

is to be changed, the desired value must first be writ-

ten into the corresponding RAM register. Before read-

ing 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. The address within the

ERASE and PROM commands must be zero.

ERASE and PROM act on all registers in parallel.

Note: To store data in the GP register, it is necessary

to set bit number 0 of the MODE register to “1”,

before

sending

ERASE

and

PROM

command. Otherwise the data stored in the GP

If all HAL880 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.

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

datory to set the LOCK bit after final adjustment

and programming of HAL880. The LOCK

function is active after the next power-up of the

sensor. The success of the lock process should

be checked by reading at least one sensor reg-

ister after locking and/or by an analog check of

the sensors output signal. Electrostatic dis-

charges (ESD) may disturb the programming

pulses. Please take precautions against ESD.

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