Hall Magnetic and Current Sensors - GMW Associates

Metrolab MagVector™ MV2 Digital 3-axis Hall Magnetic Sensor

dev_team — Sat, 05 Jan 2019 17:28:31 +0000

The MagVector MV2 is the ideal solution if you need to integrate a sophisticated magnetometer into your electronic system. A typical application would be a sensor array for a custom magnetic field-mapping system.

Metrolab uses the same sensor in several of its products, and is now making this technology available to electronic systems designers. Note that, being an electronic peripheral component, the MagVector MV2 includes none of the amenities of a traditional magnetometer: the user must supply the micro-controller, control firmware, host interface, user interface, and, last but not least, calibration. For complete 3-axis Hall magnetometers, please see the THM1176 / TFM1186 family of instruments.

Small but powerful

Measuring only 3x3x0.9 mm, the MagVector MV2 is a powerful magnetometer on a chip: three orthogonal Hall sensors measure (Bx,By,Bz); the “spinning current” technique minimises noise, offset and the Planar Hall Effect; a built-in temperature sensor permits temperature compensation; a programmable-gain amplifier provides measurement ranges from 0.1 to 30 T; and built-in ADCs and SPI (Serial Peripheral Interface) provide a digital interface in addition to an analog one.

High performance

The MV2 features a noise density of 300 nT/√Hz and an analog measurement bandwidth of 50 kHz. In digital mode, measurement rate can be traded off against ADC resolution, ranging from 0.375 to 3 kHz, and from 14 to 16 bits, respectively. It supports a supply voltage of 3.3 or 5 V. The compact 3×3 mm QFN package is completely nonmagnetic, compatible with MRI environments. Please see the Data Sheet for details.

Analog and digital interfaces

A signal pin selects between the analog or digital interface. In analog mode, configuration options such as the measurement range are selected using control signals, whereas in digital mode all configuration parameters are transferred via SPI and stored in internal registers. Additional control signals and register bits provide fine control over the measurement process, for example the timing of the analog/digital conversion. In digital mode, multiple MV2s can be connected to a single SPI bus.

FAMAS – Magnetic Angle Sensor SENA2Dx

Viki Beatty — Wed, 27 Jan 2021 19:37:23 +0000

The SENIS® Fast Magnetic Angle Sensor (FAMAS) SENA2Dx is an integrated magnetic field sensor that allows the measurement of the rotation angle of the in-plane components of a magnetic field, such as that of a permanent magnet attached on-axis to a rotating shaft. The co-integrated signal processing circuit represents a servo loop to track the external field which directly converts the angular position of the magnetic field to digital information. Thus, the angular position of the magnetic field, rotation direction, and angular velocity are available after less than 1 µs delay time. There are three modes of operation available – fast, balanced and high resolution – to offer optimal performance for the required application.

Senis 3DHALL – 3-Axis Hall Magnetic Sensor SENM3Dx

Viki Beatty — Tue, 15 Dec 2020 23:56:35 +0000

The SENIS® 3DHALL sensor SENM3Dx is a CMOS integrated magnetic field sensor that allows the acquisition of all three magnetic-field components (Bx, By and Bz) at the same time and at the same spot. The sensor incorporates three groups of mutually orthogonal Hall-effect elements (one horizontal and two vertical) with biasing circuits and amplifiers for each of them.

AKM Hall Element Magnetic Sensors

dev_team — Mon, 07 Jan 2019 11:14:03 +0000

AKM (Asahi) Hall Element Magnetic Sensors enable isolated non-contact measurement of linear and angle position, and of electric current. For mechanical position measurement the AKM Magnetic Sensors are used in combination with small permanent magnets to provide very high reliability and long life. By enabling the sensor to be sealed and isolated from the moving component the effects of contamination and friction are reduced. Electric currents produce a magnetic field with magnitude proportional to the electric current. Measurement of the magnetic field using AKM Magnetic Sensors enables the implementation of accurate electric current measurement with high voltage isolation, lower power loss and high signal to noise ratio compared to using current sense resistors. AKM Hall Element Magnetic Sensors feature high sensitivity and stability and are offered in a wide range of package types to meet different application requirements.

AKM Hall Magnetic Switch ICs

dev_team — Thu, 24 Jan 2019 18:18:10 +0000

AKM (Asahi) Hall Switch ICs consist of a Hall element and signal conditioning circuit to convert the Hall element output into a digital output.The two devices are mounted in a single, small package with three active terminals (Vcc,GND and Out). There are two choices of power consumption, continuous excitation and pulsed excitation at low duty cycles that significantly reduces the average power.

AKM Linear Hall Magnetic ICs

dev_team — Mon, 28 Jan 2019 20:46:40 +0000

AKM (Asahi) Linear Hall Effect IC Magnetic Sensors consist of a Hall Element and an Amplifer in a package. The sensors detect the magnetic field and generate an very small analog output signal proportional to the magnetic field. AKM offers 4 levels of sensitivities in the SMT (SOP) and SIP version.

The AKM non-programmable linear sensors offer a significant improvement in single axis linear Hall Effect sensing. Compared with other popular linear sensors on the market, the AKM linear sensor EQ-43XL and EQ-73XL Series has:

AKM Currentier CQ / CZ Isolated Current Sensors

dev_team — Tue, 29 Jan 2019 10:42:06 +0000

The AKM Currentier CQ / CZ Series Current Sensors are open-type current sensors using a Hall sensor, which outputs the analog voltage proportional to the AC/DC current. Very thin film is used as the Hall sensor, which enables the high-accuracy and high-speed current sensing. Coreless ultra-small surface mount package realizes the space-saving.

The CQ / CZ current sensors have linear sensing ranges from +/- 8.5A to +/- 129A (20A to 60A RMS), depending on the specific part. Response times as low as 0.5uS, and bandwidth up to dc to 1.5mHz. All the sensors are very low noise, <3mV.

Senis CS-03 High Sensitivity Isolated Current Sensor

dev_team — Tue, 29 Jan 2019 10:47:36 +0000

Senis CS-03 Series replaces Senis CS-02 Series Current Sensors. CS-02 should not be used for new designs.

Suggested alternatives:
Ametes CS0.25A-02 : Senis CS0.25A-03
Ametes CS2.5A-02 : Senis CS2.5A-03
Ametes CS10A-02 : Senis CS8A-03

Senis CS-03 is a PCB mount current sensor with a magnetic shied, multi-turn coil, high performance Hall IC and robust package.

Senis BBM-03-LV Series – Low/Medium Bus Bar Current Sensor

Viki Beatty — Fri, 20 Jan 2023 21:43:53 +0000

Bus Bar current sensor modules enable measurement of currents in the large f-bandwidth of DC to 200kHz without an impact of external magnetic fields.

The SENIS Bus Bar DC Current Sensor locates two magnetic field sensors on each side of
current bus bar. Two precision Hall ICs sense the magnetic field as a function of current on both sides. This allows to effectively cancel external magnetic fields without magnetic cores or shielding, thus avoiding non-linearities and hysteresis effects. The differential Hall voltage between the upper and the lower sensor provides a full scale output of 0±4.0V. DC current ranges that can be sensed depend on the geometry of the bus bar. The BBM-03-LV is supplied with a shielded cable connected to a RJ45 plug.

The BBM-03 Sensors replace BBM-02 and BBM-01 Series.

AKM EM-3242 Non-contact Magnetic Angle Sensor – Discontinued

dev_team — Tue, 29 Jan 2019 10:51:28 +0000

EM-3242 has been discontinued. There is no direct replacement. However, GMW does offer Senis FAMAS – Magnetic Angle Sensor SENA2Dx, a digital contactless angle sensor with < 1 µs response time.

AKM’s (Asahi Kesai) EM-3242 non-contact magnet angular sensor detects the absolute angular position of a small magnet that is positioned above the device surface. The sensor has a full 360 degree angle range with a 10bit resolution.

The sensor incorporates IMC (Integrated Magnetic Concentrator) and CMOS Hall devices to sense the magnetic field vector along with the circuitry to convert the Hall sensor signal to an analog voltage proportional to the angle position of the magnet. The sensor is packaged in a very small 6 pin SOIC which is one on the smallest integrated angle sensors on the market. Only one external component is required for operation (a 0.1µF bypass capacitor). The EM-3242 is a low power sensor requiring 2.7 to 3.3V and 8mA.

The EM-3242 has replaced the EM-3241 that is obsolete

AKM AK877x Magnetic Encoder ICs – Discontinued

dev_team — Tue, 29 Jan 2019 10:53:30 +0000

AK877x non-contact magnetic angle sensor has been discontinued. There is no direct replacement. However, GMW does offer Senis FAMAS – Magnetic Angle Sensor SENA2Dx, a digital contactless angle sensor with < 1 µs response time.

The AKM (Asahi) AK8775, AK8776, AK8777B, AK8778B, AK8779A and AK8779B are low cost magnetic encoder IC’s that can provide digital outputs corresponding to the direction and number of poles from a rotating magnet.

Applications

Non-contact angle sensing for:

Rotational direction system
Incremental pulse encoder
Mobile devices
Jog dial