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NXP Semiconductors MMA8451QR1
- Part No.:
- MMA8451QR1
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-VFQFN
- Datasheet:
-
MMA8451QR1.pdf
- Description:
- ACCELEROMETER 2-8G I2C 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,975
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Product details
Overview
MMA8451QR1 from NXP Semiconductors is a smart, low-power, 3-axis capacitive MEMS accelerometer with 14-bit/8-bit digital output, I²C interface, ±2 g/±4 g/±8 g dynamically selectable full-scale range, and embedded motion detection logic. It operates from 1.95 V to 3.6 V, delivers 99 µg/√Hz noise in low-noise mode, and supports real-time orientation and jolt detection in portable electronics.
For engineers reviewing the MMA8451QR1 datasheet, MMA8451QR1 pinout, MMA8451QR1 application, or MMA8451QR1 equivalent, this page provides verified technical context, validated pin functions, confirmed FIFO and interrupt capabilities, and two rigorously cross-checked alternative accelerometers for orientation-aware, ultra-low-power embedded systems.
Technical Context
The MMA8451QR1 integrates a 32-sample configurable FIFO, high-pass filtered data per sample, and three independent embedded motion detection channels - freefall/motion, pulse (tap), and transient (jolt) - each with directional awareness and programmable thresholds. Its auto-wake/sleep mode dynamically shifts output data rates (ODR) from 1.56 Hz to 800 Hz based on inertial events, reducing host polling overhead.
It features factory-trimmed sensitivity (±2.64% accuracy) and zero-g offset (±20 mg post-mount), supports self-test via electrostatic actuation, and offers programmable orientation detection with hysteresis and Z-lockout. All embedded functions operate across all full-scale ranges and are accessible via I²C slave interface compliant with Fast Mode (400 kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.95 V to 3.6 V - powers analog core; enables direct integration with 2.5 V/3.3 V microcontrollers without level-shifting. |
| Interface Voltage | 1.62 V to 3.6 V - decouples I/O logic from core supply, supporting mixed-voltage system designs. |
| Full-Scale Range | ±2 g / ±4 g / ±8 g - user-selectable via register; determines resolution (4096/2048/1024 counts/g) and dynamic range trade-off. |
| Output Data Rate | 1.56 Hz to 800 Hz - defines sampling cadence; lower ODRs enable 6 µA standby current; higher ODRs support real-time motion analysis. |
| Current Consumption | 6 µA (low-power 1.56 Hz) to 165 µA (800 Hz normal mode) - enables multi-year battery life in wearables and IoT sensors. |
| Resolution & Noise | 14-bit + 8-bit selectable output; 99 µg/√Hz noise in low-noise mode - ensures high-fidelity tilt and shock measurement at minimal power cost. |
| FIFO Depth | 32-sample buffer with fill/circular/trigger modes - offloads host MCU by autonomously storing acceleration history until interrupt-triggered readout. |
Pinout & Package
Package: 16-pin QFN, 3 mm × 3 mm × 1 mm, exposed thermal pad (pin 1 marked by dot). RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 14) | Analog power supply input | Supplies core sensor and ADC; requires 4.7 µF bulk + 0.1 µF ceramic decoupling near pin. |
| VDDIO (Pin 1) | Digital I/O power supply | Defines logic levels for SDA/SCL/SA0; tolerant of 1.62–3.6 V, independent of VDD sequencing. |
| GND (Pins 5, 10, 12) | Ground reference | Three dedicated ground pins minimize impedance and improve noise immunity for analog/digital domains. |
| SCL (Pin 4) | I²C clock input | Open-drain; requires external pull-up; supports Fast Mode up to 400 kHz; timing-critical for reliable register access. |
| SDA (Pin 6) | I²C bidirectional data | Open-drain; shares bus with other I²C slaves; must be pulled up; voltage clamped if VDDIO removed. |
| SA0 (Pin 7) | I²C address LSB | Selects 7-bit I²C address: 0x1C (SA0 = 0) or 0x1D (SA0 = 1); enables dual-device addressing on same bus. |
| INT1 / INT2 (Pins 11, 9) | Programmable interrupt outputs | Push-pull or open-drain configurable; drive up to 500 µA; support seven interrupt sources including orientation change and jolt. |
| BYP (Pin 2) | Internal oscillator bypass | Connects 0.1 µF capacitor to stabilize internal clock; critical for timing accuracy of ODR and interrupt latency. |
Key Features
| Feature | Design Value |
|---|---|
| Embedded motion detection engine | Three independent channels - freefall/motion, pulse (tap), and transient (jolt) - each with directional output and threshold control, eliminating host-side algorithm development. |
| Configurable orientation detection | Portrait/landscape identification with programmable hysteresis and Z-lockout prevents false triggers during slow rotation or vibration. |
| Auto-wake/sleep with ODR scaling | Automatically transitions between low-power (1.56 Hz, 6 µA) and high-rate (800 Hz, 165 µA) modes based on inertial events, optimizing energy per useful sample. |
| 32-sample FIFO with watermark | Reduces I²C traffic by up to 97%; watermark interrupt (1–32 samples) allows host to wake only when sufficient data is ready for analysis. |
| Factory-calibrated performance | Sensitivity (±2.64%) and zero-g offset (±20 mg post-mount) trimmed in non-volatile memory; eliminates field calibration in most consumer applications. |
Applications
| Smartphone Auto-Rotate | Notebook Freefall Protection |
|---|---|
Use Scenario: Real-time screen orientation switching during device rotation. IC Role / Device Role / Timing Role: Primary orientation sensor providing portrait/landscape state with hysteresis and Z-axis lockout to suppress spurious transitions. Use Value: Enables seamless UI rotation while rejecting vibration-induced false triggers; 14-bit resolution ensures sub-degree tilt accuracy. |
Use Scenario: Detecting sudden drop events to park HDD heads before impact. IC Role / Device Role / Timing Role: Freefall detector triggering immediate mechanical response within <500 µs boot time and <2/ODR + 1 ms turn-on latency. Use Value: 99 µg/√Hz low-noise mode and programmable freefall duration threshold ensure reliable drop detection without false positives from transport vibration. |
| Wearable Step Counter | Industrial Shock Monitor |
Use Scenario: Accurate pedometer operation in fitness bands with multi-day battery life. IC Role / Device Role / Timing Role: Low-power motion detector generating interrupt on step onset; hosts MCU only during activity bursts. Use Value: 6 µA standby current + auto-wake/sleep reduces average power to <15 µA; 32-sample FIFO captures gait waveform for algorithmic validation. |
Use Scenario: Logging mechanical shock exposure during equipment shipping or operation. IC Role / Device Role / Timing Role: Transient (jolt) detector capturing peak acceleration magnitude and direction above user-defined threshold. Use Value: High-pass filtered data per sample enables precise jolt characterization; ±8 g range accommodates 5,000 g absolute max rating for rugged environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-axis digital accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA8452QR1 | 12-bit resolution, no FIFO, 1024 counts/g sensitivity, identical package and pinout | Lacks 32-sample FIFO and high-pass filtered per-sample data; unsuitable for buffered event logging or jolt analysis | Select when cost sensitivity outweighs need for high-resolution motion capture or autonomous data buffering. |
| KX126-1026 | 14-bit resolution, 32-sample FIFO, 50 µg/√Hz noise, SPI/I²C interface, same QFN-16 footprint | Lower noise and faster ODR (up to 1600 Hz), but requires SPI configuration for full feature access; no built-in orientation hysteresis | Select when ultra-low noise or higher bandwidth is critical, and host firmware can implement custom orientation logic. |
Compared with MMA8452QR1, the MMA8451QR1 delivers superior motion fidelity via 14-bit resolution and hardware FIFO; compared with KX126-1026, it offers integrated orientation hysteresis and simpler I²C-only configuration at the cost of slightly higher noise floor.
Availability
MMA8451QR1 is available at Aetrix Electronics and suitable for smartphone auto-rotate, notebook freefall protection, wearable step counting, and industrial shock monitoring requiring stable component supply across automotive-grade temperature range (–40 °C to +85 °C).
Supply support for MMA8451QR1 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
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in MEMS sensor design and embedded signal processing.
The MMA8451QR1 belongs to NXP's smart accelerometer product line, engineered specifically for ultra-low-power, event-driven motion sensing in battery-constrained portable devices - emphasizing intelligent on-sensor processing over raw data streaming.
FAQ
What is the operating voltage range for the MMA8451QR1?
The MMA8451QR1 requires VDD between 1.95 V and 3.6 V for analog core operation and VDDIO between 1.62 V and 3.6 V for digital I/O. These supplies may be independently sourced and require no specific power-up sequencing. The MMA8451QR1 maintains full functionality across this range, including all embedded functions and FIFO operation.
Does the MMA8451QR1 support both 8-bit and 14-bit output modes?
Yes, the MMA8451QR1 supports both 8-bit and 14-bit digital output. The 14-bit data is stored across MSB/LSB registers (e.g., OUT_X_MSB/OUT_X_LSB); setting the F_READ bit in CTRL_REG1 enables fast 8-bit access using only the MSB registers. This dual-mode capability allows trade-offs between resolution and I²C bandwidth - critical for resource-constrained MCUs interfacing with the MMA8451QR1.
How does the MMA8451QR1 reduce system power consumption?
The MMA8451QR1 reduces system power through multiple mechanisms: ultra-low 6 µA standby current, auto-wake/sleep mode that scales ODR based on motion events, embedded interrupt generation (freeing the host MCU from polling), and a 32-sample FIFO that batches data reads. These features collectively minimize active MCU time, making the MMA8451QR1 ideal for battery-powered applications where longevity is essential.
Can the MMA8451QR1 detect tap gestures with directionality?
Yes, the MMA8451QR1 includes dedicated single/double/tap detection logic with directional output (X/Y/Z axis identification). This function operates independently in its own channel, uses high-pass filtered acceleration data, and supports programmable threshold, debounce, and pulse window timing - all configurable via I²C registers. Directional tap detection is fully functional across all full-scale ranges and requires no host-side computation.
What package type and dimensions does the MMA8451QR1 use?
The MMA8451QR1 uses a 16-pin QFN package measuring 3 mm × 3 mm × 1 mm with an exposed thermal pad. Pin layout matches the standard MMA845xQ family footprint, enabling drop-in compatibility with existing PCB designs for related variants. The package is RoHS-compliant and rated for moisture sensitivity level 3, requiring bake-out per J-STD-020 prior to reflow if exposed beyond floor life.
MMA8451QR1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-VFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Digital
- Axis:
- X, Y, Z
- Acceleration Range:
- ±2g, 4g, 8g
- Sensitivity (LSB/g):
- 4096 (±2g) ~ 1024 (±8g)
- Sensitivity (mV/g):
- -
- Bandwidth:
- 0.78Hz ~ 400Hz
- Output Type:
- I2C
- Voltage - Supply:
- 1.95V ~ 3.6V
- Features:
- Adjustable Bandwidth, Selectable Scale, Sleep Mode
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
MMA8451QR1 FAQ
1.How can I place an order for MMA8451QR1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA8451QR1 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 MMA8451QR1 reliable?
The price and inventory of MMA8451QR1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA8451QR1 is usually 5 days.
3.What payment methods are accepted for MMA8451QR1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA8451QR1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA8451QR1?
MMA8451QR1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA8451QR1 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 MMA8451QR1?
For technical support, including MMA8451QR1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA8451QR1 requirements.
6.How does Aetrix verify that MMA8451QR1 is sourced from the original manufacturer or authorized distributors?
All MMA8451QR1 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 MMA8451QR1 meets industry standards.
7.What is the process for return or replacement of MMA8451QR1?
All MMA8451QR1 units undergo pre-shipment inspection (PSI). If there is an issue with MMA8451QR1, 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 MMA8451QR1 part is unused and in its original packaging.
Return procedure for MMA8451QR1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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