Monolithic Power Systems Inc. MA735GGU-Z

Overview

MA735GGU-Z from Monolithic Power Systems is a 9- to 13-bit contactless absolute angle sensor using integrated 2D Hall-effect and Spinaxis™ phase-detection architecture. It delivers digital angle output via SPI/SSI, ABZ quadrature (configurable 1–1024 PPT), and 14-bit PWM at up to 1100 kHz refresh rate. Operates from -40°C to +125°C on 3.3V/12mA supply in UTQFN-14 (2mm×2mm), supporting end-of-shaft and side-shaft magnet mounting for motor position feedback in servo drives.

For engineers reviewing the MA735GGU-Z datasheet, MA735GGU-Z pinout, MA735GGU-Z application, or MA735GGU-Z equivalent, key selection criteria include configurable filter time constant (64µs–16ms), ±0.007° RMS noise at τ=16ms, INL accuracy of 1.1° over full temperature/magnetic field range, and magnetic field strength detection with programmable thresholds for axial diagnostics.

Technical Context

The MA735 employs MPS's proprietary Spinaxis™ front-end: two orthogonal Hall elements digitize magnetic field direction via time-to-digital conversion of sinusoidal zero-crossing phase-eliminating arctangent computation or closed-loop interpolators. This open-loop architecture achieves 1MHz internal sampling without latency under steady-state conditions.

Digital conditioning includes a configurable first-order low-pass filter (τ = 0.38 / f_CUTOFF) enabling resolution/noise trade-offs: 9-bit ±3σ resolution with 0.2° RMS noise at τ = 64µs, or 13-bit ±3σ with 0.01° RMS noise at τ = 16ms. ABZ output supports programmable pulses-per-turn (1–1024) and hysteresis (0.08–2.8°), while PWM provides 13–14-bit resolution at 840–1090 Hz.

Key Specifications

Pinout & Package

MA735GGU-Z uses UTQFN-14 (2mm × 2mm, 0.4mm height) with wettable flanks and exposed thermal pad. Package footprint enables high-density PCB layout in space-constrained motor control modules and EPS systems.

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-Z uniquely integrates ABZ encoder logic, 14-bit PWM, magnetic diagnostics, and NVM in a 2mm×2mm package-reducing BOM count, PCB area, and firmware complexity for motor control applications requiring deterministic timing and functional safety.

Availability

MA735GGU-Z is available at Aetrix Electronics and suitable for electric power steering (EPS), industrial servo motor feedback, and robotic joint actuation requiring stable component supply across automotive Tier-1, industrial OEM, and medical device production programs.

Supply support for MA735GGU-Z 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) designs high-performance power management and motion sensing ICs, emphasizing integration, efficiency, and robustness for automotive, industrial, and computing markets.

The MagAlpha® family targets contactless angular position sensing, combining Hall-effect technology with on-chip signal processing to replace legacy resolvers and optical encoders in demanding motion control systems.

FAQ

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

The MA735GGU-Z supports shaft speeds up to 60,000 rpm. This capability stems from its 1100 kHz internal refresh rate and low-latency digital architecture-enabling accurate angle capture even at extreme motor speeds common in high-performance BLDC applications and turbocharger sensors.

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

Spinaxis™ eliminates arctangent computation and closed-loop interpolation by directly measuring the phase difference between two orthogonal Hall signals using time-to-digital conversion. This open-loop method achieves higher linearity, lower latency, and better immunity to magnetic field distortion than traditional vector-magnitude approaches.

Can the MA735GGU-Z 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 datasheet specifies 40–100 mT as the guaranteed operating range; operation below 40 mT is possible but requires system-level characterization and may not meet automotive or industrial accuracy requirements.

Is the UTQFN-14 package lead-free and RoHS-compliant?

Yes. The MA735GGU-Z is lead-free, halogen-free, and fully compliant with the EU RoHS directive. MPS confirms green status per its Quality Assurance documentation, and the UTQFN-14 package uses matte tin plating with no exemptions applied.

Does the MA735GGU-Z support daisy-chaining multiple sensors on one SPI bus?

No. Each MA735GGU-Z requires a dedicated CS line because it lacks hardware address pins or ID registers. Daisy-chaining is not supported; however, up to four sensors can share SCLK/MOSI/MISO lines with individual CS lines routed to separate GPIOs on the host controller.

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

The TEST pin is reserved for factory wafer probing and final test. It has no defined function in application circuits and must be connected to GND per the datasheet. Leaving it floating may cause undefined behavior or increased susceptibility to noise.

How many write cycles are guaranteed for the on-chip NVM?

The on-chip non-volatile memory is rated for 1,000 write cycles at 25°C. Each write operation requires a mandatory 20 ms delay before reading back the register to ensure proper NVM programming. Endurance decreases at elevated temperatures, so frequent reconfiguration is discouraged in high-temp environments.