HAR2425 datasheet(7/33 Pages) MICRONAS

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DATA SHEET

HAR 24xy

Micronas

July 14, 2015; DSH000170_001EN

3. Functional Description

3.1. General Function

HAR 24xy is a dual-die integrated circuit. The two dies

have independent pins for power supply, ground, and

output to guaranty full redundancy. Due to the stacked

assembly they are in the same magnetic field position,

and thereby generating synchronous measurement

outputs. The HAR 2425 provides redundant output

voltages proportional to the magnetic flux through the

Hall plates and proportional to the supply voltage (rati-

ometric behavior). The HAR 2455 offers PWM outputs.

The external magnetic field component perpendicular

to the branded side of the package generates a Hall

voltage. The Hall IC is sensitive to magnetic north and

south polarity. For each die this voltage is converted to

a digital value, processed in the Digital Signal Process-

ing unit (DSP) according to the settings of the

EEPROM registers, converted back to an analog volt-

age with ratiometric behavior and buffered by a push-

pull output transistor stage (HAR 2425) or output as

PWM signal (HAR 2455).

The setting of a LOCK bit disables the programming of

the EEPROM memory for all time. This bit cannot be

reset by the customer.

As long as the LOCK bit is not set, the output charac-

teristic can be adjusted by programming the EEPROM

registers. The IC is addressed by modulating the out-

put voltage.

In the supply voltage range from 4.5 V up to 5.5 V, the

sensor

generates

analog

output

voltage

(HAR 2425) or a PWM signal (HAR 2455). After

detecting a command, the sensor reads or writes the

memory and answers with a digital signal on the output

pin. The analog output is switched off during the com-

munication.

Several sensors in parallel to the same supply and

ground line can be programmed individually. The

selection of each sensor is done via its output pin. See

Programming Guide HAL 24xy and HAR 24xy.

The open-circuit detection provides a defined output

voltage if the VSUP or GND line is broken.

Internal temperature compensation circuitry and the

spinning-current offset compensation enable operation

over the full temperature range with minimal changes

in accuracy and high offset stability. The circuitry also

reduces offset shifts due to mechanical stress from the

package. In addition, the sensor IC is equipped with

overvoltage and reverse-voltage protection at all pins.

Fig. 3–1: HAR2425 block diagram

OUT2

VSUP2

GND2

Internally

Temperature

Oscillator

Switched

A/D

Digital

OUT1

VSUP1

GND1

EEPROM Memory

Lock Control

Stabilized

Supply and

Protection

Devices

Dependent

Bias

Protection

Devices

Hall Plate

Converter

Signal

Processing

Temperature

A/D

Sensor

Converter

Programming

Interface

Linearization

Open-circuit,

Overvoltage,

Undervoltage

Detection

Analog

Output

D/A

Converter

16 Setpoints

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