HAL880 datasheet(23/34 Pages) MICRONAS

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DATA SHEET

HAL880

Micronas

Feb. 23, 2009; DSH000152_001EN

4. Application Notes

4.1. Application Circuit

For EMC protection, it is recommended to connect one

ceramic 4.7 nF capacitor each between ground and

the supply voltage, respectively the output voltage pin.

In addition, the input of the controller unit should be

pulled-down with a 10 k

Ω resistor and a ceramic

4.7 nF capacitor.

Please note that during programming, the sensor will

be supplied repeatedly with the programming voltage

of 12.5 V for 100 ms. All components connected to the

VDD line at this time must be able to resist this voltage.

Fig. 4–1: Recommended application circuit

4.2. Use of two HAL880 in Parallel

Two different HAL880 sensors which are operated in

parallel to the same supply and ground line can be

programmed individually. In order to select the IC

which should be programmed, both Hall ICs are

inactivated by the “Deactivate” command on the com-

mon supply line. Then, the appropriate IC is activated

by an “Activate” pulse on its output. Only the activated

sensor will react to all following read, write, and pro-

gram commands. If the second IC has to be pro-

grammed, the “Deactivate” command is sent again

and the second IC can be selected.

Note: The multi-programming of two sensors works

only if the outputs of the two sensors are pulled

to GND with a 10 k

Ω pull-down resistor.

Fig. 4–2: Parallel operation of two HAL880

OUT

VDD

GND

4.7 nF

HAL880

10 k

μC

4.7 nF

HAL880

GND

10 nF

HAL880

4.7 nF

Sensor A

Sensor B

VDD

OUT B & Select B

OUT A & Select A

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