HAL 1820 DATA SHEET
4 July 3, 2013; DSH000158_003EN Micronas
Programmable Linear Hall-Effect Sensor
Release Note: Revision bars indicate significant
changes to the previous edition.
1. Introduction
The HAL1820 is a new member of the Micronas family
of programmable linear Hall-Effect Sensors.
The HAL1820 is a universal magnetic field sensor with
a ratiometric, linear analog output. It is produced in
CMOS technology and can be used for magnetic field
measurements, current measurements, and detection
of mechanical movement. Very accurate angle mea-
surements or distance measurements can also be
made. The sensor is very robust and can be used in
electrically and mechanically harsh environments.
Major characteristics like magnetic field range, sensi-
tivity, offset (output voltage at zero magnetic field) and
the temperature coefficients are programmable in a
non-volatile memory. The HAL1820 features a cus-
tomer data register that enables the customer to store
production information (like production serial number)
inside each sensor.
The sensor includes a temperature-compensated Hall
plate with choppered offset compensation, an A/D con-
verter, digital signal processing, an EEPROM memory
with redundancy and lock function for the calibration
data, a serial interface for programming the EEPROM,
a ratiometric linear output and protection devices.
Internal digital signal processing compensates for ana-
log offsets, temperature changes, and mechanical
stress, resulting in highly stable performance.
The HAL1820 is programmable by modulation of the
supply voltage. No additional programming pin is
needed. The easy programmability allows a 2-point
calibration by adjusting the output signal directly to the
input signal (like mechanical angle, distance, or cur-
rent). Individual adjustment of each sensor during the
customer’s manufacturing process is possible. With
this calibration procedure, the tolerances of the sensor,
the magnet and the mechanical positioning can be
compensated in the final assembly.
In addition, the temperature compensation of the Hall
IC can be fit to all common magnetic materials by pro-
gramming first and second order temperature coeffi-
cients of the Hall sensor sensitivity. This enables oper-
ation over the full temperature range with high
accuracy.
The calculation of the individual sensor characteristics
and the programming of the EEPROM memory can
easily be done with a PC and the application kit from
Micronas.
The sensor is designed for industrial and automotive
applications and operates in the junction temperature
range from –40 °C up to 170 °C. The HAL1820 is
available in the very small leaded packages TO92UA-1
and TO92UA-2 and in the SMD-package SOT89B-1.
1.1. Major Applications
Due to the sensor’s robust characteristics, the
HAL1820 is the optimal system solution for applica-
tions such as:
– linear position measurements,
– angle sensors,
– distance measurements,
– magnetic field and current measurement.
1.2. Features
– Ratiometric linear output proportional to the mag-
netic field
– Various programmable magnetic characteristics with
non-volatile memory
– Digital signal processing
– Continuos measurement ranges from
20 mT to
160 mT
– Customer readable Micronas production information
(like lot number, wafer number, etc.)
– Temperature characteristics programmable for
matching all common magnetic materials
– Programming via supply voltage modulation
– Lock function and built-in redundancy for EEPROM
memory
– Temperature and stress-stable quiescent output
voltage
– on-chip temperature compensation
– active offset compensation
– operates from 40 °C up to 170 °C
junction temperature
– operates from 4.5 V up to 5.5 V supply voltage in
specification
– operates with static magnetic fields and dynamic
magnetic fields up to 2.25 kHz
– overvoltage and reverse-voltage protection at VDD
pin
– magnetic characteristics extremely robust against
mechanical stress
– short-circuit protected push-pull output
– EMC and ESD optimized design
