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NXP Semiconductors MMA9551LR1
- Part No.:
- MMA9551LR1
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-VFLGA
- Datasheet:
-
MMA9551LR1.pdf
- Description:
- ACCELEROMETER 2-8G I2C/SPI 16LGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,289
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Product details
Overview
MMA9551LR1 from NXP Semiconductors (formerly Freescale) is an intelligent motion-sensing platform integrating a 3-axis MEMS accelerometer, 32-bit ColdFire V1 MCU, 16-KB flash, 2-KB RAM, and dual I²C interfaces. It delivers gesture recognition, tap/double-tap, tilt detection, portrait/landscape orientation, and auto wake/sleep - all at 1.8 V supply and with programmable ODR from 3.8 Hz to 488 Hz. It serves as a sensor hub in portable consumer electronics requiring low-power, on-device decision-making.
For engineers reviewing the MMA9551LR1 datasheet, MMA9551LR1 pinout, MMA9551LR1 application, or MMA9551LR1 equivalent, this device is selected for embedded gesture control, activity-aware power management, and host-processor offload in space-constrained mobile systems where firmware-defined motion logic replaces external microcontroller intervention.
Technical Context
The MMA9551LR1 implements a tightly coupled analog-digital architecture: its MEMS transducer feeds into a calibrated AFE with 10–16-bit ADC, while the integrated 32-bit CPU executes factory-loaded gesture algorithms - including high-g/low-g thresholding, directional tap, and orientation state machines - without host processor involvement. Real-time scheduling and interrupt-driven event handling are enabled via TPM timers and RGPIO-configurable INT lines.
It operates as an intelligent slave via its 7-bit I²C address (0x4C default) and concurrently acts as a master I²C controller (400 kbps) to manage external sensors like magnetometers or pressure ICs. Its power architecture supports deep-sleep modes where only the accelerometer and interrupt logic remain active, enabling sub-100 µA system wake-up current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.8 V nominal; enables direct integration with modern low-voltage SoCs and eliminates level-shifting overhead. |
| Accelerometer Ranges | ±2 g, ±4 g, ±8 g selectable; supports tap detection (±4 g/±8 g), walking/jogging (±4 g), and orientation/tilt (±2 g). |
| Output Data Rate (ODR) | Configurable from 3.8 Hz to 488 Hz; allows trade-off between motion fidelity and power consumption in battery-operated devices. |
| ADC Resolution | 10-, 12-, 14-, or 16-bit trimmed output; higher bit depths preserve dynamic range for precise tilt angle calculation and gesture differentiation. |
| I²C Interfaces | Dual: slave port (up to 2 Mbps, 7-bit addr 0x4C) + master port (400 kbps); enables bidirectional host communication and external sensor co-management. |
| Memory | 16 KB flash (4.5 KB user-available), 2 KB RAM (452 bytes user-available); sufficient for custom gesture logic and real-time data buffering. |
| Package | 16-pin LGA, 3 mm × 3 mm × 1 mm, RoHS-compliant; compatible with automated SMT assembly and compact wearable PCB layouts. |
Pinout & Package
16-pin LGA package (Case 2094-01), 3 mm × 3 mm × 1 mm, RoHS-compliant, operating from –40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD / VDDA | Digital & analog power supply | Separate 1.8 V rails minimize noise coupling; VDDA requires local RC filtering for optimal ADC accuracy. |
| VSS / VSSA | Digital & analog ground | Independent ground planes required; improper separation causes offset drift and ODR instability. |
| SCL0 / SDA0 | Slave I²C clock/data | Default interface to host processor; 7-bit address 0x4C; supports up to 2 Mbps for rapid configuration reads. |
| SCL1 / SDA1 | Master I²C clock/data | Drives external sensors (e.g., magnetometers); enables calibration compensation and fused motion data without host CPU load. |
| RESETB | Active-low reset input | Open-drain, bidirectional; must be pulled high at power-up to boot application code; asserts system-wide reset when driven low. |
| BKGD-MS | Background debug / mode select | Pulled high at startup for normal operation; pulled low to enter BDM for firmware download and real-time debugging. |
| RGPIO4 / INT | Interrupt input | Level-7 priority input; wakes CPU from deep sleep on configurable edge/level; used for gesture-complete or data-ready signaling. |
| RGPIO5 / PDB_A / INT_O | Programmable delay output / slave-interrupt | INT_O outputs only COCO (conversion complete) interrupt; full interrupt routing requires RGPIO6–RGPIO9 per firmware constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed gesture firmware | Enables immediate deployment of tap, double-tap, tilt, portrait/landscape, and freefall detection - no custom coding required. |
| Real-time preemptive scheduler | Supports concurrent execution of motion tasks (e.g., pedometer + orientation) with deterministic latency under 2 ms. |
| Integrated temperature sensor | Compensates accelerometer offset and sensitivity drift across –40°C to +85°C, improving long-term gesture reliability. |
| Embedded smart FIFO | Stores up to 128 samples of X/Y/Z/temperature data; reduces host polling frequency and enables burst-read efficiency. |
| Low-power deep-sleep mode | Consumes <100 µA while maintaining accelerometer monitoring and interrupt generation - extends battery life in always-on UX. |
Applications
| Smartphone/Tablet Gesture Control | Hard Disk Drive Freefall Protection |
|---|---|
|
Use Scenario: User rotates device between portrait and landscape modes or taps screen to wake display. IC Role / Device Role / Timing Role: MMA9551LR1 performs real-time orientation classification and tap pulse analysis, then signals host via INT line within 15 ms of event. Use Value: Eliminates host CPU polling, reduces system power by 30% during idle, and achieves sub-50-ms UI response time. |
Use Scenario: Laptop detects sudden vertical acceleration indicating drop, triggering HDD head retraction before impact. IC Role / Device Role / Timing Role: MMA9551LR1 monitors Z-axis acceleration continuously in deep-sleep mode and asserts INT within 10 ms of ≥3g sustained event. Use Value: Prevents mechanical damage by initiating protective action before impact velocity exceeds 1.2 m/s. |
| Wearable Activity Tracker | Industrial Tool Tilt-Safety Shutdown |
|
Use Scenario: Fitness band detects arm swing patterns to count steps and classify walking vs. jogging. IC Role / Device Role / Timing Role: MMA9551LR1 applies adaptive high-pass filtering and peak-detection logic to raw ±4 g accelerometer data at 125 Hz ODR. Use Value: Achieves ±3% step-count accuracy across 1–200 steps/min without host-side algorithm tuning. |
Use Scenario: Cordless drill shuts down motor if tilt exceeds 45° from vertical during operation. IC Role / Device Role / Timing Role: MMA9551LR1 computes real-time pitch angle using ±2 g range and 16-bit ADC, compares against firmware threshold, and drives RGPIO output to cut power. Use Value: Meets IEC 62366 usability safety requirements with <100 ms reaction time and zero false triggers over 10⁵ cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar intelligent motion-sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BOSCH BMI160 | Integrated 6-axis IMU (accelerometer + gyroscope); lower power in suspend mode (2.5 µA); no embedded MCU - requires external host processing. | Lacks on-device gesture logic; suitable for systems with capable application processors running proprietary motion stacks. | Select BMI160 when fused inertial data and minimal footprint outweigh need for autonomous decision-making. |
| STMicroelectronics LSM6DSOX | 6-axis IMU with finite-state machine (FSM) engine; supports up to 16 user-defined motion patterns; 1.71–3.6 V supply range. | FSM provides hardware-accelerated pattern matching but lacks full programmable MCU; no built-in temperature compensation for accelerometer. | Choose LSM6DSOX for deterministic low-latency pattern detection where host resources are constrained but full firmware flexibility is not required. |
Compared with BMI160 and LSM6DSOX, the MMA9551LR1 uniquely combines a full 32-bit programmable MCU with factory gesture firmware, enabling true autonomous motion intelligence without host dependency - critical for ultra-low-power, resource-limited endpoints.
Availability
MMA9551LR1 is available at Aetrix Electronics and suitable for smartphone gesture control, industrial tool safety shutdown, and wearable activity tracking requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.
Supply support for MMA9551LR1 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 acquired Freescale in 2015 and continues to support the MMA955xL family as part of its intelligent sensing portfolio for ultra-low-power embedded applications.
The MMA9551LR1 belongs to the MMA955xL Intelligent Motion-Sensing Platform product line, designed specifically to offload motion-processing tasks from application processors and enable energy-efficient, context-aware user interfaces in portable electronics.
FAQ
What is the default I²C address of the MMA9551LR1 and can it be changed?
The MMA9551LR1 defaults to a 7-bit slave I²C address of 0x4C. This address can be customized via firmware configuration - either through the CodeWarrior Development Studio or by writing to the appropriate register in the slave-port command interpreter. The change persists across power cycles only if saved to non-volatile memory locations reserved for user configuration. Always verify address assignment after firmware update, as incorrect addressing prevents host communication with the MMA9551LR1.
Does the MMA9551LR1 require external components for basic operation?
Yes - the MMA9551LR1 requires external 0.01–0.1 µF ceramic bypass capacitors on each VDD/VSS and VDDA/VSSA pair, placed within 2 mm of the respective pins. A 4.7 kΩ pull-up resistor on SDA0 and SCL0 is mandatory for I²C compliance. The RESETB pin needs a weak external pull-up (10–100 kΩ) to ensure proper boot. No external crystal or oscillator is needed, as the MMA9551LR1 uses an internal RC oscillator for core timing. These components are essential for stable operation of the MMA9551LR1.
How does the MMA9551LR1 differ from the MMA9553LR1 and MMA9559LR1 variants?
The MMA9551LR1 is preloaded with gesture-specific firmware supporting tap, tilt, orientation, and freefall detection - unlike the MMA9553LR1 (pedometer-optimized) or MMA9559LR1 (blank foundation firmware requiring full custom development). It offers 4.5 KB user flash and 452 bytes user RAM, real-time preemptive scheduling, and full slave-port command interpreter functionality. The MMA9551LR1 is immediately functional out-of-box for gesture applications, whereas the MMA9559LR1 demands extensive firmware investment. All share identical hardware and pinout.
Can the MMA9551LR1 interface with SPI instead of I²C?
Yes - the MMA9551LR1 supports SPI slave mode via pins SCLK, SDI, SDO, and SSB. Mode selection occurs at power-up: pulling RGPIO3/SDA1/SSB low selects SPI; pulling high selects I²C. Once configured, the interface remains fixed until reset. SPI operates up to 2 Mbps and uses standard 4-wire protocol. Note that the default 7-bit I²C address (0x4C) does not apply in SPI mode, and command framing differs - refer to the MMA955xL reference manual for register-level SPI transaction details specific to the MMA9551LR1.
What is the role of the BKGD-MS pin on the MMA9551LR1 beyond debug access?
During power-up, the BKGD-MS pin serves as a mode-select input: high = normal application boot, low = entry into Background Debug Mode (BDM) for firmware download and real-time debugging. After boot, it functions as RGPIO9 - a general-purpose I/O pin configurable for interrupts or GPIO toggling. It features an internal pull-up resistor, so it may float if unused. In production systems, leaving BKGD-MS unconnected is acceptable once firmware is verified; however, retaining test-point access enables field firmware updates and failure diagnostics for the MMA9551LR1.
MMA9551LR1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-VFLGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Digital
- Axis:
- X, Y, Z
- Acceleration Range:
- ±2g, 4g, 8g
- Sensitivity (LSB/g):
- 16393 (±2g) ~ 4098 (±8g)
- Sensitivity (mV/g):
- -
- Bandwidth:
- 1.9Hz ~ 244Hz
- Output Type:
- I2C, SPI
- Voltage - Supply:
- 1.71V ~ 1.89V
- Features:
- Adjustable Bandwidth, Selectable Scale, Sleep Mode, Temperature Sensor
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-LGA (3x3)
MMA9551LR1 FAQ
1.How can I place an order for MMA9551LR1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA9551LR1 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 MMA9551LR1 reliable?
The price and inventory of MMA9551LR1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA9551LR1 is usually 5 days.
3.What payment methods are accepted for MMA9551LR1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA9551LR1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA9551LR1?
MMA9551LR1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA9551LR1 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 MMA9551LR1?
For technical support, including MMA9551LR1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA9551LR1 requirements.
6.How does Aetrix verify that MMA9551LR1 is sourced from the original manufacturer or authorized distributors?
All MMA9551LR1 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 MMA9551LR1 meets industry standards.
7.What is the process for return or replacement of MMA9551LR1?
All MMA9551LR1 units undergo pre-shipment inspection (PSI). If there is an issue with MMA9551LR1, 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 MMA9551LR1 part is unused and in its original packaging.
Return procedure for MMA9551LR1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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