Monolithic Power Systems Inc. MA302GQ-P

Overview

MA302GQ-P from Monolithic Power Systems is a 12-bit contactless absolute angle sensor using integrated Hall-effect sensing and Spinaxis™ phase-detection architecture to deliver high-accuracy angular position data at up to 60,000 rpm. It provides simultaneous digital SPI angle readout, programmable ABZ quadrature (1–256 pulses/turn), and UVW motor commutation outputs (1–8 pole pairs), with on-chip NVM for zero-angle calibration and magnetic field threshold settings. Used in BLDC motor commutation where precise rotor position and robustness against mechanical wear are critical.

For engineers reviewing the MA302GQ-P datasheet, MA302GQ-P pinout, MA302GQ-P application, or MA302GQ-P equivalent, this page delivers verified technical context, validated pin functions, real-world motor control use cases, confirmed alternatives with functional trade-offs, and supply-chain support details specific to industrial motion systems.

Technical Context

The MA302GQ-P implements a time-to-digital converter (TDC) front-end that digitizes magnetic field direction via phase detection of sinusoidal Hall signals-eliminating arctangent computation or closed-loop interpolators. Its open-loop architecture achieves 850–1100 kHz refresh rate with ≤10 µs latency at constant speed.

Digital conditioning includes a configurable low-pass filter (Fcutoff = 390 Hz) and programmable magnetic field strength monitoring (MGL/MGH flags) with ±5 mT accuracy and -600 ppm/°C temperature drift. All configuration-including zero angle, PPT, NPP, RD, and field thresholds-is stored in on-chip non-volatile memory (1,000 write cycles).

Key Specifications

Pinout & Package

MA302GQ-P is housed in a QFN-16 (3 mm × 3 mm) package with exposed thermal pad recommended to be connected to GND for optimal electrical, thermal, and mechanical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar absolute angle sensor applications.

Compared with the MA302GQ-P, the AS5055A omits integrated incremental and commutation outputs-increasing firmware load and reducing real-time determinism-while the TMAG5170 shifts angle computation to the host, eliminating on-chip zero-angle storage and field diagnostics, thereby raising system-level validation burden for automotive or industrial safety-critical use.

Availability

MA302GQ-P is available at Aetrix Electronics and suitable for brushless DC motor servo drives, robotics joint control, and electric power steering systems requiring stable component supply, extended temperature operation, and contactless reliability.

Supply support for MA302GQ-P includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management and motion control ICs, with a focus on energy efficiency, integration, and ruggedized operation.

The MagAlpha® family-including the MA302GQ-P-is designed specifically for contactless angular position sensing in demanding motor control, robotics, and automotive applications, emphasizing deterministic latency, magnetic diagnostics, and field-configurable outputs.

FAQ

What is the maximum mechanical speed supported by the MA302GQ-P?

The MA302GQ-P supports accurate angle measurement up to 60,000 rpm. This limit is determined by its 850–1100 kHz internal refresh rate and ≤10 µs propagation latency. At 60,000 rpm (1,000 rps), the sensor resolves 1,000 × 4,096 positions per second-well within its 1 MHz front-end sampling capability. Performance remains specified across the full -40°C to +125°C range.

How does the MA302GQ-P handle side-shaft (off-axis) mounting configurations?

The MA302GQ-P supports side-shaft mounting via programmable bias current trimming (BCT) and axis enable bits (ETX/ETY). These adjust Hall sensor sensitivity to compensate for nonlinearity caused by tangential/radial field imbalance. Factory calibration is not required-compensation parameters are tuned in-system using magnetic field response curves and stored in on-chip NVM.

Can the ABZ and UVW outputs operate simultaneously with SPI communication?

Yes. The MA302GQ-P generates ABZ and UVW outputs continuously and asynchronously to SPI activity. SPI reads (angle or registers) freeze the internal angle buffer without halting ABZ/UVW generation. No timing conflict exists-the outputs run independently at their configured rates (e.g., ABZ at 16 MHz, UVW at motor speed, SPI up to 25 MHz).

What is the purpose of the MGL and MGH pins, and how are their thresholds set?

MGL and MGH are open-drain diagnostic flags indicating whether sensed magnetic field strength falls below MGLT or exceeds MGHT thresholds. Thresholds are set via 3-bit registers (0x06) with ±5 mT accuracy and -600 ppm/°C drift. They enable functions like magnet detachment detection, axial position sensing, or field health monitoring without external circuitry.

Is the exposed thermal pad on the QFN-16 package required to be connected to ground?

While the MA302GQ-P will function with the exposed pad floating, MPS recommends connecting it to GND. This improves thermal dissipation (θJC = 12 °C/W), reduces junction temperature rise under continuous 12 mA operation, enhances electrical noise immunity, and provides mechanical stability-critical for vibration-prone motor control environments.

Does the MA302GQ-P support automatic SPI mode detection, and which modes are compatible?

Yes. The MA302GQ-P automatically detects and adapts to SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) on power-up. No configuration is needed. Both modes support MSB-first 16-bit frame transfers, with Mode 0 using rising-edge capture and Mode 3 using falling-edge capture-ensuring interoperability with common microcontrollers.

How many write cycles are guaranteed for the on-chip non-volatile memory?

The on-chip NVM is rated for 1,000 write cycles at 25°C. Each write operation (e.g., updating zero angle or PPT) requires a mandatory 20 ms delay between SPI frames to complete the EEPROM programming sequence. Exceeding the cycle limit may cause parameter retention failure; field recalibration is recommended before reaching end-of-life.