HAL800 datasheet(5/24 Pages) MICRONAS

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HAL 800

Micronas

2. Functional Description

2.1. General Function

The HAL 800 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.

The external magnetic field component perpendicular

to the branded side of the package generates a Hall

voltage. This voltage is converted to a digital value,

processed in the Digital Signal Processing Unit (DSP)

according to the EEPROM programming, converted to

an analog voltage with ratiometric behavior, and stabi-

lized by a push-pull output transistor stage. The func-

tion and the parameters for the DSP are detailed

explained in Section 2.2. on page 7.

The setting of the LOCK register disables the program-

ming of the EEPROM memory for all time. This regis-

ter cannot be reset.

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

characteristic can be adjusted by modifying the

EEPROM registers. The IC is addressed by modulat-

ing the supply voltage (see Fig. 2–1). In the supply

voltage range from 4.5 V up to 5.5 V, the sensor gener-

ates an analog output voltage. After detecting a com-

mand, 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 communica-

tion.

Internal temperature compensation circuitry and the

choppered offset compensation enables operation

over the full temperature range with minimal changes

in accuracy and high offset stability. The circuitry also

rejects offset shifts due to mechanical stress from the

package. The non-volatile memory is equipped with

redundant EEPROM cells. In addition, the sensor IC is

equipped with devices for overvoltage and reverse volt-

age protection at all pins.

Fig. 2–1: Programming with VDD modulation

Fig. 2–2: HAL800 block diagram

HAL

800A

VDD

GND

OUT

analog

VDD

digital

Internally

Temperature

Oscillator

Switched

A/D

Digital

D/A

Analog

OUT

VDD

GND

Supply

EEPROM Memory

Lock Control

Digital

stabilized

Supply and

Protection

Devices

Dependent

Bias

Protection

Devices

Hall Plate

Converter

Signal

Processing

Converter

Output

Level

Detection

Output

100

Ω

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