Monolithic Power Systems Inc. MA735GGU-P

Overview

MA735GGU-P from Monolithic Power Systems is a 9- to 13-bit contactless absolute angle sensor using integrated 2D Hall-effect and Spinaxis™ phase-detection architecture to measure angular position of diametrically magnetized rotors. It delivers ABZ quadrature (configurable 1–1024 PPT), 14-bit PWM, and SPI/SSI digital outputs in a UTQFN-14 (2mm × 2mm) package, supporting end-of-shaft and side-shaft mounting up to 60,000 rpm in automotive throttle and robotic joint applications.

For engineers reviewing the MA735GGU-P datasheet, MA735GGU-P pinout, MA735GGU-P application, or MA735GGU-P equivalent, this page provides verified technical context on magnetic field detection thresholds, filter time-constant programmability, ABZ hysteresis (0.08–2.8°), PWM resolution (13–14 bits), and NVM-stored zero-angle calibration - all critical for servo loop stability and diagnostic-enabled designs.

Technical Context

The MA735GGU-P implements MPS's proprietary Spinaxis™ front-end, digitizing magnetic field angle via time-to-digital conversion of sinusoidal phase-eliminating arctangent computation or feedback interpolators. Its open-loop 1 MHz front-end output feeds a configurable digital filter with τ = 64 µs (9-bit resolution, 0.2° RMS noise) or τ = 16 ms (13-bit resolution, 0.01° RMS noise).

It integrates dual serial interfaces: SPI Mode 0/3 (25 MHz max, auto-detected) for full register read/write and NVM configuration, and SSI (two-wire, angle-only readout). Magnetic field strength detection uses two independently configurable thresholds (MGHT/MGLT) with ±5 mT accuracy and -600 ppm/°C drift, enabling axial movement sensing and magnet health diagnostics.

Key Specifications

Pinout & Package

MA735GGU-P is housed in an ultra-small UTQFN-14 package (2 mm × 2 mm, 0.45 mm height) with wettable flanks for automated optical inspection. The package supports both end-of-shaft and side-shaft magnet configurations, with sensitive volume centered within ±50 µm of the die surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS5055A and TMAG5170, MA735GGU-P uniquely integrates ABZ, PWM, and SPI in one UTQFN-14 package with on-chip NVM and field diagnostics - reducing BOM count, eliminating host computation, and enabling drop-in replacement in space-constrained motion systems.

Availability

MA735GGU-P is available at Aetrix Electronics and suitable for automotive throttle control, industrial servo feedback, robotics joint monitoring, and medical linear actuator positioning requiring stable component supply across extended temperature and high-reliability environments.

Supply support for MA735GGU-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 sensing solutions, with design centers in the US, China, and Taiwan.

The MagAlpha® family, including MA735GGU-P, was engineered specifically for contactless angular position sensing in demanding motion control applications - prioritizing resolution, speed, diagnostic capability, and compact packaging.

FAQ

What is the maximum rotational speed supported by MA735GGU-P?

The MA735GGU-P supports continuous operation up to 60,000 rpm. This is enabled by its 1 MHz front-end sampling rate and low-latency digital filtering - ensuring accurate angle capture even at extreme speeds without aliasing or phase lag in servo control loops.

How does the Spinaxis™ technology differ from traditional Hall-based angle sensors?

Spinaxis™ uses phase detection of a sinusoidal field waveform instead of arctangent calculation or interpolator-based methods. This eliminates computational latency and sensitivity to amplitude variation, delivering true open-loop 1 MHz angle updates with inherent immunity to field strength fluctuations.

Can MA735GGU-P operate with magnets weaker than 40 mT?

Yes, but performance degrades: linearity (INL) exceeds 1.1° and resolution drops below specified 9–13-bit range. The device remains functional down to ~20 mT, but 40–100 mT is the validated range for full specification compliance per datasheet testing conditions.

Is the NVM write endurance sufficient for field calibration updates?

The on-chip NVM guarantees 1,000 write cycles at 25°C. Each write requires a mandatory 20 ms delay for programming. For applications requiring frequent recalibration, use SPI to update volatile registers instead - NVM is intended for infrequent, persistent settings like zero-angle and ABZ configuration.

What is the purpose of the TEST pin, and how should it be handled?

The TEST pin is reserved for factory wafer-level testing and must be externally tied to GND in all production designs. Leaving it floating or pulling it high may cause undefined behavior, including failure to initialize or erratic ABZ/PWM output timing.

Does MA735GGU-P support both clockwise and counterclockwise rotation direction reporting?

Yes - the RD bit (Register 9, Bit[7]) configures output rotation direction. Factory default is clockwise (RD = 0); writing RD = 1 flips the angle output polarity to report increasing angle on counterclockwise rotation, matching mechanical convention in many robotic joints.

How is magnetic field strength detection used for diagnostics?

MGH (magnetic high) and MGL (magnetic low) flags indicate whether the sensed field is above MGHT or below MGLT thresholds. These can detect magnet detachment (MGL asserts), saturation (MGH asserts), or axial shift - enabling predictive maintenance without additional sensors.