HAR2425 datasheet(30/33 Pages) MICRONAS

30 / 33 page

HAR 24xy

DATA SHEET

July 14, 2015; DSH000170_001EN

Micronas

5. Application Notes

5.1. Application Circuit

For EMC protection, it is recommended to connect one

ceramic capacitor, e.g. 47 nF, between ground and the

supply voltage, respectively the output voltage pin.

Fig. 5–1: Recommended application circuit

(analog output)

Fig. 5–2: Recommended application circuit

(PWM output)

If the two dies are operated in parallel to the same sup-

ply and ground line, they can be programmed individu-

ally as the communication with the sensors is done via

their output pins.

5.2. Measurement of a PWM Output Signal

of HAR 2455

In case of the PWM output, the magnetic field informa-

tion 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. 5–3).

Note: The PWM signal is updated with the rising edge.

Hence, for signal evaluation, the trigger-level

must be the rising edge of the PWM signal.

Fig. 5–3: Definition of PWM signal

5.3. Ambient Temperature

Due to the internal power dissipation, the temperature

on the silicon chip (junction temperature TJ) is higher

than the temperature outside the package (ambient

temperature TA).

The maximum ambient temperature is a function of

power dissipation, maximum allowable die tempera-

ture,

and

junction-to-ambient

thermal

resistance

(Rthja). With a maximum of 5.5V operating supply volt-

age the power dissipation P is 0.097 W per die, for a

total of 0.194 W. The junction to ambient thermal resis-

tance Rthja is specified in Section 4.9. on page 24

The difference between junction and ambient air tem-

perature is expressed by the following equation:

5.4. Pad Size Layout

Fig. 5–4: Recommended pad size dimensions in mm

OUT1

GND1 / GNDePad

47 nF

VSUP1

47 nF

HAR 2425

OUT2

GND2

47 nF

VSUP2

47 nF

OUT1

GND1 / GNDePad

180 pF

VSUP1

47 nF

HAR 2455

OUT2

GND2

180 pF

VSUP2

47 nF

Update

Out

time

VHigh

VLow



thja



16.5°C

0.4 mm

4.5 mm

1.35 mm

7.2 mm

0.65 mm

4.3 mm

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