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NXP Semiconductors MMA9555LR1
- Part No.:
- MMA9555LR1
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- -
- Datasheet:
-
MMA9555LR1.pdf
- Description:
- MMA9555, INTELLIGENT MOTION-SENS
- Quantity:
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Inventory:3,634
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Product details
Overview
MMA9555LR1 from NXP Semiconductors is an intelligent motion-sensing pedometer IC integrating a 3-axis MEMS accelerometer, 16-bit ADC (0.061 mg/LSB @ 2 g), 32-bit microcontroller, and factory-loaded firmware for step counting, activity-level classification (rest/walking/jogging/running), distance/speed/calorie estimation, and six-direction orientation detection. It operates from 1.8 V, draws 117 µA in active pedometer mode, and supports I²C/SPI up to 2 Mbps - deployed in wearable fitness trackers and smart wristbands.
For engineers reviewing the MMA9555LR1 datasheet, MMA9555LR1 pinout, MMA9555LR1 application, or MMA9555LR1 equivalent, key selection criteria include its integrated pedometer + six-direction firmware, autosleep/autowake power management, GPIO-configurable interrupt outputs (e.g., step change on RGPIO4), and LGA-16 package compatibility with space-constrained portable designs.
Technical Context
The MMA9555LR1 implements a real-time, preemptive scheduler that offloads motion-processing tasks from the host MCU - enabling system-level power savings by keeping the application processor powered down until triggered by motion events or interrupts. Its analog front end includes capacitance-to-voltage conversion, temperature sensing, and selectable anti-aliasing filters (100 Hz / 50 Hz).
Communication occurs via dedicated slave I²C or SPI interfaces operating independently of the CPU subsystem - accessible even during deep-sleep (Stop No Clock) mode. Firmware execution runs from internal flash, with mailbox-based command/response and streaming modes supporting host-driven configuration of pedometer thresholds, orientation sensitivity, and GPIO mapping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accelerometer Resolution | 16-bit ADC with 0.061 mg/LSB sensitivity at ±2 g range - enables precise step-detection thresholding and low-motion discrimination. |
| Supply Voltage | 1.8 V nominal - matches common ultra-low-power wearable rail; separate VDDA/VSSA pins allow analog noise isolation. |
| Active Current Draw | 117 µA during pedometer operation - extends battery life in coin-cell-powered wearables beyond 6 months. |
| Interface Speed | Up to 2 Mbps SPI or standard-mode/fast-mode I²C - supports high-throughput sensor data reads without host CPU bottlenecks. |
| Operating Temp | –40 °C to +85 °C - validated for consumer-grade wearable use across environmental extremes. |
| Firmware Functionality | Factory-programmed pedometer + six-direction orientation + GPIO I/O - no user firmware development required for core motion analytics. |
Pinout & Package
Package: 16-pin LGA, 3 mm × 3 mm × 1 mm, Case 2094-01 - optimized for compact wearable PCB layouts with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD / VSS / VDDA / VSSA | Digital & analog power/ground rails | Separate digital/analog supplies reduce noise coupling into accelerometer signal chain; VDDA filtering recommended per datasheet Figure 3. |
| SCL0 / SDA0 / RGPIO0–RGPIO9 | I²C clock/data or SPI clock/data/select or configurable GPIO | Multi-function pins enable flexible host interface selection (I²C vs SPI) and programmable interrupt routing (e.g., RGPIO4 = INT output for step events). |
| RESETB | Active-low open-drain reset input | Pulled high at startup to boot from flash; can be driven low by host to force device reset without power cycle. |
| RGPIO5 / INT_O | Interrupt output with programmable event source | Configurable to assert on step count increment, activity level change, or orientation transition - reduces polling overhead on host MCU. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated pedometer firmware | Delivers calibrated step count, speed/distance estimation, and calorie calculation without host-side algorithm implementation. |
| Six-direction orientation detection | Provides real-time portrait/landscape/up/down/left/right classification using fused accelerometer data - usable for UI auto-rotation or posture monitoring. |
| Autosleep/autowake capability | Enters sub-2 µA stop mode when motion ceases; wakes on configurable acceleration threshold - eliminates need for external wake controller. |
| Configurable RGPIO interrupt outputs | Eight RGPIO pins (RGPIO0–RGPIO7) support programmable edge-triggered interrupts for motion events, reducing host polling frequency and power. |
| Slave interface accessibility in deep sleep | I²C/SPI registers remain readable/writable during Stop No Clock mode - enables host to reconfigure parameters without full device wake-up. |
Applications
| Fitness Tracking Wearable | Smart Wristband |
|---|---|
Use Scenario: Continuous step counting and activity-level classification (rest/walking/jogging/running) over multi-day battery life in a wrist-worn form factor. IC Role / Device Role / Timing Role: Primary motion analytics engine - performs all sensor fusion, step detection, and activity state transitions internally. Use Value: Reduces host MCU computational load and power consumption by >40% compared to discrete accelerometer + software-based pedometer implementations. | Use Scenario: Real-time orientation-aware display rotation and gesture-triggered UI actions in a compact wristband with limited PCB area. IC Role / Device Role / Timing Role: Six-direction orientation detector with <100 ms latency - provides stable tilt-state updates to host display controller. Use Value: Enables responsive auto-rotation without requiring host to run continuous accelerometer sampling and quaternion math. |
| Sleep Monitoring Band | Health & Wellness Tracker |
Use Scenario: Overnight detection of body position changes (supine/prone/left/right) and movement patterns to assess sleep quality metrics. IC Role / Device Role / Timing Role: Low-power orientation + motion classifier - uses autosleep/autowake to sample only during movement events. Use Value: Achieves >14-day battery life on 100 mAh cell while delivering clinically relevant positional data for sleep staging algorithms. | Use Scenario: Multi-parameter health tracking including daily step goals, calorie burn estimation, and sedentary alert triggers in a consumer wellness device. IC Role / Device Role / Timing Role: Integrated pedometer + activity monitor - computes distance, calories, and activity intensity levels from raw acceleration data. Use Value: Eliminates need for host-side calibration tables or empirical models - delivers consistent, factory-trimmed accuracy across production units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar intelligent motion-sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA9553L | Same hardware platform but requires user-developed firmware; lacks factory-loaded pedometer + six-direction firmware. | Targeted at developers needing custom motion algorithms; not drop-in for out-of-box pedometer use. | Select MMA9553L only if full firmware control and additional flash/RAM resources are required. |
| BMI160 | Combines 16-bit accelerometer + 16-bit gyroscope; no built-in pedometer firmware - requires host-side motion processing stack. | Used where angular motion (rotation, gesture) is critical alongside linear motion; higher BOM cost and host compute load. | Choose BMI160 when gyroscope data or advanced gesture recognition (tap/double-tap/freefall) is mandatory. |
Compared with MMA9553L and BMI160, MMA9555LR1 delivers immediate pedometer and orientation functionality without host firmware development, reduces system-level power via autonomous autosleep/autowake, and minimizes PCB footprint with single-chip integration - making it optimal for cost-sensitive, battery-constrained wearables requiring certified motion analytics.
Availability
MMA9555LR1 is available at Aetrix Electronics and suitable for wearable fitness trackers, smart wristbands, and health-monitoring bands requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature operation.
Supply support for MMA9555LR1 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.
The MMA955xL intelligent sensor platform - including MMA9555LR1 - was designed specifically for ultra-low-power motion analytics in portable consumer electronics, with factory-programmed firmware to eliminate host MCU compute burden and accelerate time-to-market for wearable products.
FAQ
What firmware features are preloaded on the MMA9555LR1?
The MMA9555LR1 ships with complete factory-build firmware for pedometer (step counting, distance, speed, calorie estimation), activity-level classification (rest/walking/jogging/running), six-direction orientation detection, and GPIO input/output control. No user programming is required - all motion analytics execute autonomously within the device's 32-bit CPU and internal memory.
Does the MMA9555LR1 support both I²C and SPI communication simultaneously?
No - the MMA9555LR1 supports either I²C or SPI as a slave interface, selected at power-up via the RGPIO3/SSB pin state. When RGPIO3 is high at startup, I²C mode is enabled; when low, SPI mode activates. Both interfaces operate up to 2 Mbps and remain accessible during deep-sleep modes.
How does the MMA9555LR1 achieve ultra-low power consumption in pedometer applications?
The MMA9555LR1 achieves 117 µA active current and 2 µA stop-mode draw through hardware-accelerated motion processing - its integrated scheduler and firmware handle step detection and orientation analysis without waking the host MCU. Autosleep/autowake transitions occur autonomously based on acceleration thresholds, minimizing idle power.
Can the MMA9555LR1's six-direction orientation output be customized for specific mounting orientations?
Yes - the MMA9555LR1 allows configuration of orientation detection thresholds and axis mapping via its mailbox interface. Users can define custom tilt angles, disable axes, or remap physical device orientation to logical states (e.g., "up" = Z+ instead of Y+) using register writes over I²C or SPI - no firmware modification needed.
What is the role of the RGPIO pins on the MMA9555LR1?
The MMA9555LR1 provides ten Rapid GPIO (RGPIO0–RGPIO9) pins, eight of which (RGPIO0–RGPIO7) support configurable interrupt outputs for motion events (e.g., step count increment on RGPIO4). RGPIO6–RGPIO8 also serve as analog inputs (AN0/AN1) or timer/PWM channels, enabling mixed-signal expansion without external components.
MMA9555LR1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Axis:
- -
- Acceleration Range:
- -
- Sensitivity (LSB/g):
- -
- Sensitivity (mV/g):
- -
- Bandwidth:
- -
- Output Type:
- -
- Voltage - Supply:
- -
- Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MMA9555LR1 FAQ
1.How can I place an order for MMA9555LR1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA9555LR1 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 MMA9555LR1 reliable?
The price and inventory of MMA9555LR1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA9555LR1 is usually 5 days.
3.What payment methods are accepted for MMA9555LR1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA9555LR1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA9555LR1?
MMA9555LR1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA9555LR1 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 MMA9555LR1?
For technical support, including MMA9555LR1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA9555LR1 requirements.
6.How does Aetrix verify that MMA9555LR1 is sourced from the original manufacturer or authorized distributors?
All MMA9555LR1 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 MMA9555LR1 meets industry standards.
7.What is the process for return or replacement of MMA9555LR1?
All MMA9555LR1 units undergo pre-shipment inspection (PSI). If there is an issue with MMA9555LR1, 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 MMA9555LR1 part is unused and in its original packaging.
Return procedure for MMA9555LR1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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