Monolithic Power Systems Inc. MA732GQ-Z

Overview

MA732GQ-Z from Monolithic Power Systems is a 14-bit contactless absolute angle sensor using integrated Hall-effect sensing and Spinaxis™ phase-detection architecture. It delivers ABZ quadrature (programmable 1–1024 PPT), 14-bit PWM, and SPI/SSI digital outputs with ±0.7° INL at 25°C, operating from -40°C to +125°C at 3.3V/12mA. It supports end-of-shaft and side-shaft magnet mounting for servo motor position feedback.

For engineers reviewing the MA732GQ-Z datasheet, MA732GQ-Z pinout, MA732GQ-Z application, or MA732GQ-Z equivalent, key selection criteria include programmable filter time constant (64µs–16ms), magnetic field strength diagnostics (MGL/MGH flags), on-chip NVM for zero-angle and ABZ configuration, and dual-output compatibility with real-time control loops in automotive EPS and industrial servo drives.

Technical Context

The MA732 employs Spinaxis™ phase-detection-digitizing magnetic field direction via time-to-digital conversion of sinusoidal zero-crossings-eliminating arctangent computation and closed-loop interpolation. Its front-end delivers raw 1MHz angle data to a configurable second-order digital filter (τ = 0.38/f_cutoff) that sets effective resolution (9–14.5 bits) and noise floor (0.003–0.12° RMS).

Dual output paths operate independently: ABZ quadrature runs up to 16MHz with programmable hysteresis (0.08–2.8°) and edge count (4–4096), while PWM provides 13–14-bit resolution at 840–1090Hz. Magnetic field detection thresholds (MGLT/MGHT) are stored in NVM and used to generate digital flags indicating axial misalignment or magnet degradation.

Key Specifications

Pinout & Package

MA732GQ-Z is housed in a thermally enhanced QFN-16 (3mm × 3mm, 0.5mm pitch) package with exposed thermal pad recommended for grounding. Pin functions are validated per MPS MA732 Rev. 1.1 datasheet (Aug 2022).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS5055A-BQFT and TMAG5170AHQ, MA732GQ-Z uniquely integrates ABZ, PWM, and magnetic diagnostics in a single QFN-16 package with on-chip NVM-eliminating external components and firmware complexity for servo and EPS applications requiring deterministic, self-contained angle output.

Availability

MA732GQ-Z is available at Aetrix Electronics and suitable for automotive electric power steering, industrial servo motor feedback, and robotic joint actuation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MA732GQ-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) is a fabless semiconductor company specializing in high-performance power management and sensing ICs, with design focus on efficiency, integration, and reliability for automotive and industrial markets.

The MagAlpha® family-including MA732GQ-Z-is engineered specifically for contactless angular position sensing in demanding motion control systems, emphasizing robustness against vibration, temperature, and magnetic interference.

FAQ

What is the maximum mechanical shaft speed supported by MA732GQ-Z?

The MA732GQ-Z supports shaft speeds up to 60,000 rpm. This is enabled by its 16MHz ABZ update rate and <10µs propagation delay, ensuring accurate edge timing even at high rotational velocities. Performance is verified with diametrically magnetized N35 Ø5×3mm magnets and ≤1.5mm air gap in end-of-shaft configuration.

Can MA732GQ-Z operate without an external microcontroller?

Yes-MA732GQ-Z delivers fully processed angle data via three independent outputs: ABZ quadrature, 14-bit PWM, and SPI/SSI serial. No host processor is required to compute angle; the device performs all signal conditioning, filtering, and encoding internally using its Spinaxis™ front-end and digital block.

How is magnetic field strength monitored, and what is its practical use?

Magnetic field strength is monitored via two user-programmable thresholds (MGLT and MGHT) stored in NVM. Digital outputs MGL and MGH assert when field drops below or rises above those levels. This enables detection of magnet detachment, axial misalignment, or demagnetization-critical for functional safety in EPS and robotics.

Does MA732GQ-Z require external decoupling capacitors?

Yes-a 1µF ceramic capacitor must be placed close to the VDD pin with a low-impedance path to GND. The datasheet specifies this for stable operation across temperature and load transients. The exposed thermal pad should also be connected to GND for optimal electrical noise immunity and thermal dissipation.

Is the zero-angle position factory-programmed or user-configurable?

The zero-angle position is fully user-configurable and stored in on-chip non-volatile memory. It can be set via SPI write to registers 0x00 and 0x01 (16-bit value), persisting across power cycles. Factory default is 0°, but field calibration allows precise alignment to mechanical home positions without hardware modification.

What is the difference between SPI and SSI interfaces on MA732GQ-Z?

SPI supports full bidirectional communication (angle read, register read/write) at up to 25MHz. SSI is receive-only, uses a non-standard protocol (low-idle SSCK, dummy first edge), and supports angle read only. SSI cannot configure registers-SPI is required for setup, diagnostics, and dynamic reconfiguration.

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

The on-chip NVM is rated for 1,000 write cycles at 25°C. Each register write requires a mandatory 20ms delay for non-volatile programming. This endurance is sufficient for initial calibration and infrequent field updates-designs requiring frequent writes should cache settings externally.