HAL855 datasheet(12/102 Pages) MICRONAS

12 / 102 page

HAL8xy, HAL100x

APPLICATION NOTE

Programmer Board

Sept. 19, 2013; APN000046_03EN

Micronas

3. Usage of the Hall Programmer V 5.1

3.1.

Tips for Safe Programming of the Sensors

The Hall programmer board V 5.1 generates all voltage levels according to the specifi-

cation of the serial protocol.

VPROG

external generation

In case of the sensors HAL805, HAL815, HAL817, HAL810, HAL824, HAL825,

HAL830, HAL835, HAL880, HAL1000 and HAL1002 the programming voltage VPROG

(which is necessary for the permanent storing of the data in the EEPROM memory) has

to be generated externally, i.e. by the programmer board. If VPROG is out of the specifi-

cation limits, the programming of the EEPROM memory may be insufficient and the

reliability of the sensor may be reduced. Hence, the Hall programmer board V 5.1 is

equipped with an on-board A/D-converter which reads back the programming voltage

VPROG. The A/D-converter is polled every 80 µs.

If VPROG drops below 12.4 V, an error flag is set and the ERROR LED on the program-

mer board ignites. Please ensure that your software evaluates the error flags (see

Section 2.7).

VPROG

internal generation

In case of the sensors HAL855 and HAL856, the programming voltage is generated

internally. The supply voltage of the Hall sensor during programming must be 5.0 V.

The width of both pulses (erase and prom) is defined by the programmer board. In case

a customer-specific software is implemented, please ensure that the programming time

is set to 100 ms.

We recommend supervising the programming process and verification of the results

after programming the sensors (see Table 3–1).

Note: The programming voltage VPROG is measured at the output of the Hall program-

mer board. However, this measurement cannot consider any voltage drop which

may occur between the Hall programmer board and the Hall sensor.

The voltage drop between the programmer board and the Hall sensor must not

exceed 50 mV.

Please ensure that the Hall sensor and the programmer board are connected

low resistively to a common ground.

Note: Electrostatic discharges (ESD) may disturb the programming pulses. Please

take precautions against ESD.

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