Monolithic Power Systems Inc. MA782GGU-P

Overview

MA782GGU-P from Monolithic Power Systems is an ultra-small, low-power contactless absolute angle sensor IC that detects the angular position of a diametrically magnetized rotating magnet using Spinaxis™ phase-detection technology. It delivers 8–12-bit resolution, <0.5 µA idle current, and SPI interface output with integrated wake-up interrupt and magnetic field strength alarm. It operates from 3.3 V across –40°C to +125°C in QFN-14 (2 mm × 2 mm) packaging, targeting battery-powered HMI and motion-sensing applications.

For engineers reviewing the MA782GGU-P datasheet, MA782GGU-P pinout, MA782GGU-P application, or MA782GGU-P equivalent, this page provides verified technical context on its power cycling modes, ASC timing control, magnetic field threshold detection, and NVM-configurable zero-angle calibration - all critical for low-power rotary encoder design in portable and automotive-adjacent systems.

Technical Context

The MA782GGU-P implements a digital open-loop angle measurement architecture based on time-to-digital conversion of Hall-derived sinusoidal phase signals, eliminating arctangent computation or feedback interpolators. Its front-end operates at 1 MHz sampling rate and supports configurable digital filtering via programmable filter window (FW), yielding effective resolution from 8 to 12 bits with ±0.7° INL at 25°C.

Three distinct power modes - Active (10 mA), Idle (<1 µA), and Automatic Sampling Cycle (ASC) - are controlled via EN and ASC pins or internal NVM registers. The on-chip 128 MHz high-frequency clock enables precise latency control (4–16,000 µs), while magnetic field strength detection (MGL/MGH flags) uses configurable thresholds with ±5 mT accuracy and –600 ppm/°C temperature drift.

Key Specifications

Pinout & Package

MA782GGU-P is housed in a thermally enhanced, lead-free QFN-14 package (2 mm × 2 mm, 0.5 mm height) with exposed thermal pad. Pin 1 is marked by a dot; top-side marking includes "KV" product code, year code "Y", and lot number "LLL".

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS5600 and TMAG5170, MA782GGU-P uniquely integrates wake-up interrupt, magnetic field alarm, and NVM-based configuration in a 2 mm × 2 mm QFN - delivering lower system-level power, smaller footprint, and reduced firmware complexity for battery-constrained HMI applications.

Availability

MA782GGU-P is available at Aetrix Electronics and suitable for smart door locks, e-bike throttle controls, foldable tablet hinges, and low-power rotary HMI dials requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for MA782GGU-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 solutions, with global design centers and AEC-Q100-qualified product lines.

The MagAlpha® family, including MA782GGU-P, is engineered for ultra-low-power, high-accuracy angular position sensing in portable, automotive, and industrial motion-control systems - emphasizing integration, thermal robustness, and magnetic resilience.

FAQ

What is the minimum air gap required between the MA782GGU-P and a diametrically magnetized cylinder magnet?

The recommended air gap is 1.5 mm for optimal linearity and resolution with a standard Ø5×3 mm N35 neodymium magnet. Performance remains functional down to 0.5 mm, but INL degrades beyond ±1.1° and field sensitivity increases. Mechanical placement precision must be within ±0.5 mm to maintain specified accuracy across temperature.

Can MA782GGU-P operate with a 1.8 V I/O supply while VDD remains at 3.3 V?

Yes. VDDIO accepts 1.8–3.3 V independently of VDD (3.0–3.6 V), allowing direct SPI interfacing with 1.8 V microcontrollers without level shifters. Input thresholds scale accordingly: VIH is 1.2 V min at 1.8 V VDDIO, and VOL is guaranteed ≤0.4 V at 4 mA sink current.

How does the Automatic Sampling Cycle (ASC) mode reduce average current consumption?

ASC alternates between Active mode (10 mA, full sensing) and Idle mode (<0.5 µA, SPI-only). Average current scales linearly with duty cycle - e.g., 1% active time yields ~100 µA average. The on-chip low-power clock controls tACTIVE and tCYCLE, both stored in NVM and configurable via SPI write to registers 18 and 19.

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

The zero-angle offset is fully user-configurable and stored in on-chip NVM. It can be set via SPI write to register 0x01 (ZRO) and persists across power cycles. Default zero is defined by magnetic field orientation at power-up unless overwritten; no factory calibration trim is performed.

Does MA782GGU-P support both clockwise and counterclockwise rotation direction reporting?

Yes. Rotation direction is configurable via bit RD (bit 0) in register 0x09. Setting RD = 1 reverses output polarity so angle increases counterclockwise - matching mechanical convention in many HMI dials and hinge designs without requiring host-side sign inversion.

What happens to the ND and DV pins during Idle mode?

In Idle mode, ND remains low (no new data), and DV stays low (no valid filtered output). Both pins become active only after transition to Active mode and completion of front-end startup (35 µs) and digital filter stabilization (τ-dependent). ND asserts first, followed by DV once filter settles.

Can magnetic field strength thresholds be adjusted in real time during operation?

Yes. MGLT (magnetic low threshold) and MGHT (magnetic high threshold) are stored in registers 0x1A and 0x1B and can be modified via SPI write at any time. Threshold changes take effect immediately on next field sampling cycle; no NVM store is required unless persistence across power cycles is needed.