Linear Hall Sensor PWM SOIC8

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The HAL 38xy is a new sensor family using the Micronas 3D HAL technology. This new family has several members. HAL 385x provides a linear, ratiometric analog output signal with integrated wire-brake detection working with pull-up or pull-down resistor. HAL 387x features a configurable PWM output with up to 12 bit resolution with frequencies between 0.25 kHz and 2 kHz.

Conventional planar Hall technology is only sensitive to the magnetic field orthogonal to the chip surface. In addition to the orthogonal magnetic field, HAL 38xy is also sensitive for magnetic fields applied in parallel to the chip surface. This is possible by integrating vertical Hall plates into the standard CMOS process.

The sensor cell can measure three magnetic field components BX, BY, and BZ. This enables a new set of potential applications, like wide distance or throughshaft angular measurements.

On-chip signal processing calculates the angle out of two of the magnetic field components and converts this value to an output signal. Due to the measurement method, the sensor exhibits excellent drift performance over the specified temperature range resulting in a new class of accuracy for angular or linear measurements.

Additionally to the built-in signal processing, the sensor features an arbitrary programmable linear characteristic for linearization of the output signal (with up to 32 setpoints).

Major characteristics like gain and offset of X/Y- and Z-channel, reference position, phase shift between X/ Y- and Z-signal, hysteresis, low-pass filter frequency, output slope, and offset and clamping levels can be adjusted to the magnetic circuitry by programming the non-volatile memory.

The sensor contains advanced on-board diagnostic features that enhance fail-safe detection. In addition to standard checks, such as overvoltage and undervoltage detection and wire break, internal blocks such as ROM and signal path are monitored during normal operation. For devices with a PWM output, the error modes are indicated by a change of PWM frequency and duty-cycle.

The devices are designed for automotive applications and operate with junction temperature from -40 °C up to 170 °C.

The sensors are available in a very small four-pin leaded transistor package TO92UP, as well as in a SOIC8 package.

Micronas hal_38xy_001.jpg

Major Applications:

• Linear movement measurement
• EGR valve position, Clutch pedal position
• Through-shaft rotary position measurement
• Gear selector, Throttle valve position, etc.

Symmetry Electronics (and its e-commerce division: is an authorized Micronas distributor.


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Operates from 40 C up to 170 C junction temperature robust against temperature and stress influence
12 bit ratiometric linear output for HAL 385x
0.25 kHz to 2 kHz (up to 12 bit) PWM output for HAL 387x
Programmable arbitrary output characteristic with up to 32 setpoints
8 kHz sampling frequency
Operates from 4.5 V up to 5.5 V supply voltage
Operates from 40 C up to 170 C junction temperature
Programming via the sensors output pin
Programmable characteristics in a non-volatile memory (EEPROM) with redundancy and lock function
Programmable first-order low-pass filter
Programmable hysteresis
Programmable output slope and offset
X/Y- and Z-channel gain and offset of signal path programmable
Phase shift between X/Y- and Z-channel programmable
Programmable output clamping for error band definition
Programmable reference position
Programmable magnetic range detection
32 bit identification number for customer
32 bit identification number with Micronas production information (like X,Y position; wafer number; lot number)
On-Board diagnostics of different functional blocks of the sensor
Short-circuit protected push-pull output
Over- and reverse-voltage protection at VSUP
Under- and overvoltage detection of VSUP
Wire-break detection with pull-up or pull-down resistor
EMC and ESD robust design

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