Monolithic Power Systems Inc. MA730GQ-P

Overview

MA730GQ-P from Monolithic Power Systems is a 14-bit contactless absolute angle sensor using integrated Hall-effect sensing and Spinaxis™ phase-detection architecture to deliver high-accuracy angular position data at rotational speeds up to 60,000 rpm. It provides simultaneous ABZ incremental (programmable 1–1024 pulses/turn), PWM (14-bit resolution), and SPI/SSI digital outputs, with on-chip NVM for zero-angle calibration and magnetic field threshold configuration. It is deployed in motor rotor position feedback for servo drives and electric power steering systems.

For engineers reviewing the MA730GQ-P datasheet, MA730GQ-P pinout, MA730GQ-P application, or MA730GQ-P equivalent, key selection considerations include its 13.8-bit typical effective resolution, 8–10 µs latency at constant speed, programmable ABZ hysteresis (0.1°), magnetic field strength diagnostics (MGL/MGH flags), and QFN-16 (3mm×3mm) package compatibility with end-of-shaft and side-shaft magnet mounting.

Technical Context

The MA730GQ-P implements a direct time-to-digital conversion of magnetic field phase-measured via integrated Hall devices-eliminating arctangent computation or closed-loop interpolation. Its front-end delivers raw angle data at 1 MHz, processed by a configurable first-order digital filter (Fcutoff = 23 Hz) that adds no latency under steady-state conditions.

Dual output paths are independently configurable: ABZ quadrature supports up to 4096 edges per turn with programmable PPT and index pulse positioning, while PWM operates at 840–1090 Hz with 13–14-bit resolution. Magnetic field detection thresholds (MGLT/MGHT) are stored in NVM and used to generate diagnostic flags (MGL/MGH) indicating axial misalignment or magnet degradation.

Key Specifications

Pinout & Package

MA730GQ-P is housed in a thermally enhanced QFN-16 package (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad recommended for grounding. Pin functions support dual serial interfaces (SPI and SSI), ABZ quadrature, PWM, and magnetic diagnostics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MA730GQ-P, AS5048B omits ABZ/PWM hardware and offers lower temperature stability, while TMAG5170 shifts angle computation to the host and lacks non-volatile zero storage-making MA730GQ-P uniquely suited for embedded, self-contained motor control where deterministic timing and minimal host overhead are critical.

Availability

MA730GQ-P is available at Aetrix Electronics and suitable for electric power steering systems, industrial servo feedback loops, and robotic joint actuation requiring stable component supply, automotive-grade temperature resilience, and long-term production continuity.

Supply support for MA730GQ-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 sensing ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MagAlpha product line delivers contactless angle sensing ICs optimized for motor control, robotics, and automotive applications-emphasizing high resolution, wide temperature operation, and integrated diagnostics without external computation.

FAQ

What is the maximum rotational speed supported by the MA730GQ-P?

The MA730GQ-P supports continuous operation up to 60,000 rpm. Its 1 MHz internal sampling rate and 8–10 µs latency ensure accurate angle capture even at high speeds. ABZ jitter remains below 0.2° up to 60 mT field strength, and PWM output maintains monotonicity without phase wraparound artifacts.

How is zero-angle calibration performed on the MA730GQ-P?

Zero-angle calibration is stored in on-chip non-volatile memory via SPI register writes to addresses 0x00 (Z[7:0]) and 0x01 (Z[15:8]). The value represents a 16-bit offset subtracted from the raw angle (Equation 2). Calibration can be executed once during final test or in-field via host MCU, with 1,000 write-cycle endurance guaranteed at 25°C.

Can the MA730GQ-P operate with side-shaft (off-axis) magnet mounting?

Yes-the MA730GQ-P explicitly supports side-shaft configurations. Its Spinaxis™ architecture and programmable bias current trimming (BCT, ETX, ETY registers) allow compensation for non-linear field geometry. Factory default settings assume end-of-shaft mounting, but register adjustments restore linearity for off-axis use cases like ring-magnet installations.

What is the purpose of the MGL and MGH pins?

MGL and MGH are open-drain diagnostic flags indicating whether the sensed magnetic field is below MGLT or above MGHT thresholds. These thresholds are programmable via registers 0x06 and are used to detect magnet displacement, demagnetization, or contamination-enabling predictive maintenance and functional safety monitoring without host CPU intervention.

Does the MA730GQ-P require external passive components for basic operation?

Yes-a 1 µF ceramic decoupling capacitor is required between VDD and GND, placed adjacent to pins 13 and 8. No external resistors or filters are needed for ABZ, PWM, or SPI operation. The exposed thermal pad should be connected to GND for optimal thermal dissipation and signal integrity, though functionality is preserved without it.

Is the MA730GQ-P RoHS-compliant and halogen-free?

Yes-MA730GQ-P is lead-free, halogen-free, and fully compliant with the EU RoHS directive. MPS confirms green status per its Quality Assurance documentation, and the device meets JEDEC J-STD-020 moisture sensitivity level (MSL) 3 requirements for standard surface-mount assembly.

What is the difference between SPI and SSI interfaces on the MA730GQ-P?

SPI supports full register read/write and angle readout at up to 25 MHz; SSI supports angle readout only, uses a low-idle clock with mandatory dummy rising edge, and is incompatible with standard SSI masters. SPI is used for configuration and diagnostics; SSI serves as a lightweight, low-pin-count streaming interface for angle data.