HAL810 datasheet(22/30 Pages) MICRONAS

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HAL810

DATA SHEET

Feb. 6, 2009; DSH000034_003EN

Micronas

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 pin. In addi-

tion, 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. Measurement of a PWM Output Signal

The magnetic field information is coded in the duty

cycle of the PWM signal. The duty cycle is defined as

the ratio between the high time “s” and the period “d” of

the PWM signal (see Fig. 4–2).

Please note: The PWM signal is updated with the fall-

ing edge. If the duty cycle is evaluated with a micro-

controller, the trigger-level will be the falling edge of

the PWM signal.

Fig. 4–2: Definition of PWM signal

OUT

VDD

GND

4.7 nF

HAL810

10 k

μC

4.7 nF

Update

Out

time

Vhigh

Vlow

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