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HAL1820UA-A

Programmable Linear Hall Effect Sensor

Micronas 

HAL 1820

DATA SHEET

2. Functional Description

2.1. General Function

The HAL1820 is a monolithic integrated circuit which

provides an output voltage proportional to the mag-

netic flux through the Hall plate and proportional to the

supply voltage (ratiometric behavior).

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. This voltage is converted to a digital

value, processed in the Digital Signal Processing Unit

(DSP) according to the settings of the EEPROM regis-

ters, converted back to an analog voltage by a D/A

converter and buffered by a push-pull output transistor

stage. The function and the parameter for the DSP are

explained in Section 2.2. on page 8. Internal tempera-

ture compensation circuitry and the choppered offset

compensation enables operation over the full tempera-

ture range with minimal degradation in accuracy and

offset. The circuitry also rejects offset shifts due to

mechanical stress from the package. In addition, the

sensor IC is equipped with devices for overvoltage and

reverse-voltage protection at supply pin.

A LOCK register disables the programming of the

EEPROM memory. The register can not be reset by

the customer.

As long as the LOCK register is not set, the output

characteristic can be adjusted by programming the

EEPROM registers. The IC can be programmed via

VSUP line. After detecting a command, the sensor

reads or writes the memory and answers with a digital

signal on the output pin.

Output/Magnetic Field Polarity

Applying a south-pole magnetic field perpendicular to

the branded side of the package will increase the out-

put voltage (for Sensitivity < 0) from the quiescent (off-

set) voltage towards the supply voltage. A negative

magnetic field will decrease the output voltage. The

output logic will be inverted for sensitivity >0.

In addition HAL1820 features an internal error detec-

tion. The following error modes can be detected:

– Over-/underflow in adder or multiplier

– Over-/underflow in A/D converter

– Overtemperature detection

In case of an error the sensors output will be forced to

the lower error band. The error band is defined by

VDIAG (see Section 3.6. on page 14).

VSUP

Internally

stabilized

Supply and

Protection

Devices

Temperature

Dependent

Bias

Oscillator

Undervoltage

Detection

Protection

Devices

Switched

Hall Plate

A/D

Converter

Digital

Signal

Processing

D/A

Converter

Analog

Output

Programming

Interface

GND

EEPROM Memory

Lock Control

Fig. 2–1: HAL1820 block diagram

50 

OUT

6

July 3, 2013; DSH000158_003EN

Micronas

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