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Novosense NSM301X: The High-Accuracy Wide Temperature Range Hall Angle Sensors

Image of the Novosense NSM3011 Hall Angle Sensor IC

NSM301X is a contactless angle sensor that provides high accuracy angle position measurement with wide temperature range from -40°C to 125°C. NSM301X senses the magnetic field strength which is generated by the two-pole magnet based on an integrated Hall element array and converts the magnetic field strength into angular position of the magnet through the internal DSP. NSM301X provides different outputs include analogue voltage, PWM, OWI, SPI, UVW. The NSM301x provides SPI and OWI interfaces for signal path configuration. The output characteristics of NSM301x can be configured according to users’ requirement (such as output interface, gain, clamping values, output filter, etc.).

Image of Novosense NSM301X Hall Angle Sensor basic Circuit diagram

The chip supports 3.3V, 5V power supply voltage (different power supply versions) With the NSM301x series, Novosense offers suitable angle sensors not only for the industrial and consumer market, but also for the automotive sector.

The sensors of the NSM301x series integrate various helpful features, which offer advantages while implementing an application and guarantee its later safe function, such as Automatic Gain Compensation (AGC), Zero Position Setting or an SON feature. In addition, Novosense also implemented dynamic angular error compensation into these sensors.

The sensor can adjust the gain of the signal path according to the strength of the sensed magnetic field. The input signal is amplified to occupy the most range of the internal ADC, thereby improving the sampling accuracy. The AGC feature allows the best possible gain to be set automatically. This ensure the adaption of the sensor to different mechanical constraints and magnetic fields.

Image of Novosense NSM301X Hall Angle Sensor zero reset

With the Zero Position Setting the electrical angle can be aligned to the mechanical angle of the magnet.

The sensor also measures the magnetic field in Z direction. On the NSM3013 this SON function is used to determine the distance of the magnet to the sensor. Users can set high and low switching thresholds so that at a certain strength of the magnetic field the SON pin outputs a high or low signal. This feature can be used to implement functions like a rotary push button

Image showing the capability of the Novosense NSM301X to measure magnetic fields in the Z-Direction using the SON function to allow implementation of a  non-contact rotary button switch

All 3 derivatives of the NSM301x family have an OWI, PWM and analogue output. If you need a digital SPI interface, the NSM3012 is the right choice. The NSM3013 does not have SPI but offers an UVW interface instead and the SON pin described above.

Key Features of the Novosense NSM301X

  • 14-bit Analog output DAC / 12-bit PWM output / UVW output

  • Automatic Gain Compensation

  • ±0,2° accuracy after calibration

  • SON digital output for measuring strength of magnetic field in Z direction with programmable threshold

  • Diagnosis function for abnormal outputs

  • Differential Hall sensor for stray field suppression

  • Feature for offset temperature drift suppression

  • speed: 10000 rpm

  • Interfaces for configuration: SPI / OWI

  • Supply Voltage: 3,0V..5,5V / 4,5V..5,5V

  • Operating Temperature: -40°C..125°C

  • AEC-Q100 Grade 1 qualified

  • Package: SOP8

Applications of the NSM301X Hall Angle Sensors


- Valve angle sensor (throttle, EGR, ball valve, expansion valve, etc.)

- Accelerator pedal angle sensor

- Electronic gear shifter

- Wiper position sensor

- Body height sensor


- Industrial steering gear angle sensor

- Non-contact rotary button switch


- Home printer

- Hand-held marking gun

- Moving curtain angle detection

If you want to explore the capabilities of this low cost, high accuracy 3-axis angle measurement device, contact Ineltek today to arrange a quote or samples.

Image of a PDF thumbnail to download the data sheet of the Novosense NSM301X family of Hall Angle Sensors

Novosense NSM301X Hall Angle Sensor Family Data Sheet


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