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Monolithic Power Systems Inc. MA734GQ-P
- Part No.:
- MA734GQ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Angle, Linear Position Measuring
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MA734GQ-P.pdf
- Description:
- 8-BIT TO 12.5-BIT, 3S LOW-LATENC
- Quantity:
- Payment:
- Shipping:
Inventory:252
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Product details
Overview
MA734GQ-P from Monolithic Power Systems is a contactless 8-bit to 12.5-bit absolute angle sensor IC using SpinAxis™ phase-detection technology to digitize magnetic field direction without arctangent computation. It delivers 3µs latency at constant rotation, supports 0–60,000 rpm, operates from -40°C to +125°C, and interfaces via SPI with programmable digital filtering for servo motor control loops. It is deployed in end-of-shaft and side-shaft magnet configurations for real-time position feedback in high-speed rotating systems.
For engineers reviewing the MA734GQ-P datasheet, MA734GQ-P pinout, MA734GQ-P application, or MA734GQ-P equivalent, this page provides verified technical context, SPI timing constraints, magnetic field threshold configuration, NVM register persistence behavior, and validated mounting guidance for end-of-shaft and off-axis deployments.
Technical Context
The MA734GQ-P implements a proprietary SpinAxis™ front-end that directly converts in-plane X/Y magnetic field components into time-encoded phase information using integrated 2D Hall devices, then digitizes angle via time-to-digital conversion - eliminating interpolation or closed-loop computation. Its open-loop architecture enables deterministic 1 MHz internal sampling and sub-microsecond latency.
Digital conditioning includes three selectable filter time constants (τ = 4µs / 1ms / 4ms), each yielding distinct effective resolution (8.0 / 11.5 / 12.5 bits) and noise floor (0.4° / 0.05° / 0.02° RMS), while preserving 3µs propagation delay under constant-speed conditions. Magnetic field detection thresholds (MGL/MGH) are independently configurable for HMI push-button or diagnostic flagging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Angle Resolution | Programmable 8-bit to 12.5-bit effective resolution; selects trade-off between noise floor (0.02° RMS) and bandwidth (95 Hz to 95 kHz cutoff). |
| Latency | 3 µs constant-speed propagation delay; enables real-time closed-loop control in high-bandwidth servo drives. |
| Rotation Range | 0–60,000 rpm continuous operation; supports both static angle measurement and high-speed rotary feedback. |
| Operating Temp | -40°C to +125°C ambient; qualified for automotive under-hood and industrial motor control environments. |
| Supply & Current | 3.3 V ±10%, 11 mA typical supply current; compatible with standard LDO-regulated 3.3 V rails. |
| Magnetic Field | 30–60 mT operational range; tolerates field strength variation with <0.01 deg/mT output drift. |
| SPI Interface | Mode 0/3 auto-detected, 16-bit frame, MSB-first; supports partial reads (e.g., 8-bit angle) and register-level NVM store/restore. |
Pinout & Package
MA734GQ-P is housed in a QFN-16 (3 mm × 3 mm) package with exposed thermal pad (recommended floating). Pin functions are validated per MPS Rev. 1.1 datasheet and include dedicated SPI signals, dual magnetic field threshold outputs (MGH/MGL), interrupt (IRQ), error flag (ERR), and NVM busy indicator (NVM).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IRQ | Interrupt output | Active-low pulse when angle change exceeds user-defined threshold; triggers host MCU wake-up or event capture. |
| 2 ERR | Error flag output | Active-high signal indicating internal fault (e.g., field out-of-range, NVM access error, or communication timeout). |
| 3 NVM | NVM busy indicator | High during NVM write/restore operations; used to synchronize host SPI commands and avoid command collision. |
| 4 MOSI | SPI data input | Internal pull-down; accepts 16-bit SPI frames for register writes, NVM store, or clear-fault commands. |
| 5 /CS | SPI chip select | Active-low, internal pull-down; initiates SPI transaction and freezes angle buffer on falling edge. |
| 7 MISO | SPI data output | Tri-state output; returns 16-bit angle or register value; pulled low when /CS is high. |
| 8 GND | Power ground | Primary return path for analog/digital supplies; must be low-impedance with local 1 µF decoupling. |
| 11 MGL | Low-field detect | Active-high digital output when sensed field falls below programmable MGLT threshold; used for HMI or diagnostics. |
| 12 SCLK | SPI clock input | Internal pull-down; supports variable frequency; requires RC low-pass filter (200 Ω + 10 pF) near sensor per layout guidelines. |
| 13 VDD | 3.3 V supply | Must be decoupled with 1 µF capacitor placed adjacent to pin; no internal regulation - requires stable external source. |
| 16 MGH | High-field detect | Active-high output when field exceeds MGHT threshold; complements MGL for windowed field monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| SpinAxis™ Phase Detection | Direct time-based digitization of magnetic field angle eliminates arctangent computation and interpolation errors. |
| Configurable Filter Time Constant | Three τ settings (4 µs / 1 ms / 4 ms) allow dynamic optimization of resolution-noise-bandwidth trade-offs per application. |
| On-Chip NVM Storage | Non-volatile memory retains zero-angle offset, field thresholds, and rotation direction across power cycles. |
| Dual Magnetic Threshold Outputs | MGL and MGH pins provide real-time, hardware-level field strength status without host CPU polling or SPI overhead. |
| Side-Shaft & End-of-Shaft Support | Validated mechanical flexibility: works with diametric cylinder magnets mounted axially or radially up to 10% radius tolerance. |
Applications
| Automotive Throttle Position Sensing | Industrial Servo Motor Rotor Feedback |
|---|---|
|
Use Scenario: Monitoring throttle plate angular position in gasoline engine intake manifolds under vibration, temperature cycling, and EMI exposure. IC Role / Device Role / Timing Role: Absolute angle sensor providing real-time, contactless position data to ECU for fuel injection and ignition timing control. Use Value: 1.1° INL over -40°C to +125°C ensures consistent air-fuel ratio calibration; 3 µs latency enables responsive transient correction during rapid pedal actuation. |
Use Scenario: Closed-loop commutation feedback for PMSM/BLDC motors in CNC spindles and robotic joints operating up to 60,000 rpm. IC Role / Device Role / Timing Role: High-bandwidth rotor position encoder interfacing directly to motor control MCU via SPI with deterministic timing. Use Value: Programmable 12.5-bit resolution at 95 Hz cutoff delivers <0.02° RMS noise for precise torque ripple suppression; side-shaft mounting simplifies mechanical integration. |
| Robotics Joint Angle Monitoring | HMI Rotary Knob with Push Detection |
|
Use Scenario: Measuring joint articulation angles in collaborative robots where compact size, wide temp range, and immunity to dust/oil are critical. IC Role / Device Role / Timing Role: Compact, embedded angle transducer replacing optical encoders in space-constrained actuator housings. Use Value: QFN-16 (3 mm × 3 mm) footprint minimizes PCB area; -40°C to +125°C rating supports operation inside sealed gearmotor casings. |
Use Scenario: Detecting both rotational position and axial press action in premium audio/video control knobs and medical device dials. IC Role / Device Role / Timing Role: Dual-function sensor delivering angle data and hardware-level push-event flag via MGL/MGH outputs. Use Value: Configurable magnetic thresholds enable reliable tactile feedback detection independent of SPI polling; NVM stores user-defined zero-angle and HMI thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar absolute angle sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AMS AS5055A | 12-bit resolution, 2.5 µs latency, I²C-only interface, no MGL/MGH outputs, no NVM for field thresholds. | Lacks hardware field monitoring outputs and SPI flexibility; requires external microcontroller for threshold logic. | Select if I²C bus compatibility and minimal latency are prioritized over field diagnostics and SPI configurability. |
| Texas Instruments TMAG5170 | 16-bit resolution, 3.5 µs latency, 3-axis field sensing, SPI/I²C, no on-chip NVM for configuration storage. | Supports 3D field vector analysis but requires external EEPROM or MCU flash for persistent settings like zero-angle. | Select when multi-axis field analysis or higher resolution is required, and host firmware can manage configuration persistence. |
Compared with AS5055A and TMAG5170, the MA734GQ-P uniquely integrates NVM-stored configuration, dual hardware field flags, and programmable filtering - reducing host processing load and enabling self-contained HMI or diagnostic functionality without external memory or software intervention.
Availability
MA734GQ-P is available at Aetrix Electronics and suitable for automotive throttle position sensing, industrial servo motor feedback, robotics joint monitoring, and HMI rotary knob applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MA734GQ-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 design centers in the US, China, and Taiwan.
The MA734 product line targets high-reliability, contactless angular position sensing in automotive, industrial, and robotics systems - emphasizing low latency, magnetic field robustness, and embedded configurability without external memory.
FAQ
What is the minimum magnetic field strength required for MA734GQ-P to meet datasheet specifications?
The MA734GQ-P is specified for 30–60 mT magnetic field strength. At fields below 30 mT, linearity (INL) and effective resolution degrade beyond guaranteed limits - e.g., INL may exceed 1.1° and noise may rise above 0.02° RMS. Operation is possible down to ~15 mT, but performance must be validated per application.
Can MA734GQ-P operate with SPI Mode 1 or Mode 2?
No. The MA734GQ-P only supports SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), which are auto-detected on power-up or /CS assertion. Modes 1 and 2 are not implemented and will result in communication failure or undefined behavior.
How does the exposed thermal pad (Pin 17) affect thermal performance and reliability?
The exposed pad is electrically isolated and thermally connected to the die. MPS recommends leaving it floating (not soldered) to avoid unintended ground paths or solder bridging. Thermal resistance (θJA = 50°C/W) is characterized with the pad unconnected; attaching it may alter thermal behavior and is not validated in the datasheet.
Is the 3 µs latency specification valid across the full 0–60,000 rpm range?
Yes - the 3 µs latency is guaranteed under constant-speed rotation conditions, verified by characterization testing. At acceleration/deceleration or discontinuous motion, latency remains deterministic but system-level response depends on host SPI read timing and filter configuration.
What happens to NVM contents during reflow soldering?
NVM data survives standard lead-free reflow profiles (peak ≤260°C). The MA734GQ-P's NVM is rated for >100,000 write cycles and retains data for >10 years at +125°C. No data loss occurs during JEDEC-compliant assembly; configuration persists through power cycling and thermal stress.
Does MA734GQ-P support automatic zero-angle calibration during operation?
No. Zero-angle offset is set once via SPI register write (Registers 0–1) and stored in NVM. There is no runtime auto-calibration feature. However, the host MCU can trigger a new zero-point capture at any time and commit it to NVM using the Store All Registers command.
Can MGL and MGH outputs be used simultaneously with SPI angle reads?
Yes. MGL and MGH are asynchronous, hardware-level comparators independent of SPI activity. They update in real time based on instantaneous field strength and do not interfere with angle acquisition, filtering, or SPI transactions.
MA734GQ-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Package/Case:
- 16-VFQFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- For Measuring:
- Angle
- Technology:
- Hall Effect
- Rotation Angle - Electrical, Mechanical:
- -
- Linear Range:
- -
- Output:
- SPI
- Output Signal:
- Programmable
- Actuator Type:
- External Magnet, Not Included
- Linearity:
- -
- Resistance:
- -
- Resistance Tolerance:
- -
- Voltage - Supply:
- 3V ~ 3.6V
- Mounting Type:
- Surface Mount
- Termination Style:
- SMD (SMT) Tab
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-QFN (3x3)
MA734GQ-P FAQ
1.How can I place an order for MA734GQ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MA734GQ-P on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MA734GQ-P reliable?
The price and inventory of MA734GQ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MA734GQ-P is usually 5 days.
3.What payment methods are accepted for MA734GQ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MA734GQ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MA734GQ-P?
MA734GQ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MA734GQ-P order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MA734GQ-P?
For technical support, including MA734GQ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MA734GQ-P requirements.
6.How does Aetrix verify that MA734GQ-P is sourced from the original manufacturer or authorized distributors?
All MA734GQ-P products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MA734GQ-P meets industry standards.
7.What is the process for return or replacement of MA734GQ-P?
All MA734GQ-P units undergo pre-shipment inspection (PSI). If there is an issue with MA734GQ-P, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MA734GQ-P part is unused and in its original packaging.
Return procedure for MA734GQ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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