Monolithic Power Systems Inc. MA702GQ-Z

Overview

MA702GQ-Z from Monolithic Power Systems is a 12-bit contactless absolute angle sensor using integrated Hall-effect sensing and Spinaxis™ phase-detection architecture. It delivers real-time angular position via SPI/SSI serial, ABZ quadrature (programmable 1–256 PPT), and 12-bit PWM outputs, with magnetic field strength diagnostics and on-chip NVM for zero-angle and threshold configuration. It operates at up to 60,000 rpm in automotive throttle, EPS, and industrial rotary encoders.

For engineers reviewing the MA702GQ-Z datasheet, MA702GQ-Z pinout, MA702GQ-Z application, or MA702GQ-Z equivalent, this page provides verified technical context, validated pin functions, confirmed ABZ/PWM timing specs, magnetic field detection thresholds, and real-world mounting guidance for end-of-shaft and side-shaft configurations.

Technical Context

The MA702GQ-Z employs Spinaxis™ phase-detection-digitizing magnetic field direction directly via time-to-digital conversion of sinusoidal zero-crossings-eliminating arctangent computation or closed-loop interpolators. Its front-end delivers 1 MHz raw angle data with open-loop latency of 8–10 µs at constant speed.

Digital conditioning applies a configurable low-pass filter (f_CUTOFF = 390 Hz) to achieve 11.0–12.8 effective bits resolution (3σ noise ≤ 0.03°), while on-chip NVM stores programmable parameters including zero angle, ABZ pulses-per-turn (PPT), magnetic high/low thresholds (MGHT/MGLT), and rotation direction (RD).

Key Specifications

Pinout & Package

MA702GQ-Z 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 AS5048A-BQFT and TLE5012BE1500, MA702GQ-Z uniquely balances 12-bit precision, triple-output flexibility (SPI/ABZ/PWM), magnetic diagnostics, and QFN-16 compactness-making it optimal for cost-sensitive, high-volume automotive and industrial motion control where interface versatility and field robustness are essential.

Availability

MA702GQ-Z is available at Aetrix Electronics and suitable for automotive throttle position sensing, electric power steering (EPS) motor control, and industrial rotary encoder modules requiring stable component supply across extended temperature ranges and high-reliability magnetic sensing.

Supply support for MA702GQ-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 solutions, with design centers in the US, China, and Taiwan.

The MagAlpha® product line delivers contactless magnetic angle sensors optimized for automotive, industrial, and robotics applications demanding high resolution, multi-interface support, and robust field diagnostics-all in compact QFN packages.

FAQ

What is the maximum rotational speed supported by the MA702GQ-Z?

The MA702GQ-Z supports continuous operation up to 60,000 rpm. This is enabled by its 1 MHz internal angle refresh rate and low-latency digital architecture, which maintains 0.3° ABZ jitter even at full speed with magnetic fields between 30–60 mT. Performance remains within specification across the full -40°C to +125°C temperature range.

Can the MA702GQ-Z be used in side-shaft (off-axis) mounting configurations?

Yes. The MA702GQ-Z explicitly supports side-shaft mounting via programmable bias current trimming (BCT, ETX, ETY registers) to compensate for field distortion. Its sensitive volume is confined within 50 µm of the QFN center, enabling accurate angle reconstruction even when mounted laterally to a rotating ring or cylinder magnet.

How does the magnetic field strength detection work, and what are its practical uses?

The MA702GQ-Z monitors field amplitude in real time and asserts open-drain MGH/MGL flags when field exceeds or falls below user-programmed thresholds (MGHT/MGLT, 3-bit resolution). This enables axial position sensing (e.g., detecting actuator stroke), magnet detachment alerts, and diagnostic validation of proper magnet placement during assembly.

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

While the MA702GQ-Z will function without connecting the exposed pad, MPS recommends tying it to GND for optimal performance: it improves thermal dissipation (reducing junction temperature rise), enhances electrical noise immunity, and strengthens mechanical attachment. The pad is internally connected to GND and has no voltage potential.

What is the minimum time required between SPI register write commands?

A 20 ms delay is mandatory between the first (write request) and second (acknowledge) SPI frames when writing to on-chip NVM registers. This is the time required for non-volatile memory programming. Failure to observe this delay results in the register retaining its previous value. No delay is needed for SPI angle reads or register reads.

Does the MA702GQ-Z support standard SSI protocol, or is a custom interface required?

The MA702GQ-Z implements a proprietary SSI variant: SSCK idles low (vs. standard high), and requires a dummy rising edge to initiate transmission. It is incompatible with standard SSI masters. Only angle reading is supported-no register access-and data order is MSB-first with up to 17 clock cycles (1 dummy + up to 16 data).

What is the effective resolution under worst-case conditions (full temp and field range)?

Under worst-case conditions (-40°C to +125°C, 30–60 mT), the MA702GQ-Z guarantees ≥11.0 effective bits (3σ noise ≤ 0.03°) and ≤1.1° INL. This is achieved through on-chip digital filtering (390 Hz cutoff) and Spinaxis™ phase-detection, which avoids interpolation errors common in arctangent-based architectures.