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NXP Semiconductors MMA7331LCR2
- Part No.:
- MMA7331LCR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 14-TFLGA
- Datasheet:
-
MMA7331LCR2.pdf
- Description:
- ACCELEROMETER 4-9G ANALOG 14LGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,207
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Product details
Overview
MMA7331LCR2 from Freescale Semiconductor is a 3-axis capacitive MEMS accelerometer with integrated signal conditioning, selectable ±4g/±9g full-scale range, 400 μA active current, and Sleep Mode (3 μA). It delivers ratiometric analog outputs (XOUT/YOUT/ZOUT), features self-test and temperature compensation, and is designed for motion sensing in battery-powered portable electronics.
For engineers reviewing the MMA7331LCR2 datasheet, MMA7331LCR2 pinout, MMA7331LCR2 application, or MMA7331LCR2 equivalent, key selection criteria include its LGA-14 package footprint, g-Select logic-controlled sensitivity switching, fast 0.5 ms enable response time, and ±5000g shock survivability - all critical for handheld device integration and freefall detection reliability.
Technical Context
The MMA7331LCR2 integrates a surface-micromachined polysilicon g-cell sensor with an ASIC implementing switched-capacitor C-to-V conversion, single-pole low-pass filtering, and NVM-trimmed gain/offset calibration. Its internal 11 kHz clock drives sampling and filter operation without external components.
Signal path includes temperature-compensated offset and sensitivity, ratiometric output scaling with VDD (2.2–3.6 V), and independent self-test electrostatic actuation per axis. The g-Select pin (Pin 10) configures gain to deliver either 308 mV/g (±4g) or 83.6 mV/g (±9g), while Sleep Mode (Pin 7) disables analog outputs to reduce current to 3 μA typ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.2 V – 3.6 V - Enables direct interface with 2.5 V/3.3 V microcontrollers without level-shifting. |
| Active Current Consumption | 400 μA typ - Supports >100-hour battery life in always-on motion-detection applications. |
| Sleep Mode Current | 3 μA typ - Reduces power by 133×, ideal for periodic wake-up sensing in wearables and remote controls. |
| Full-Scale Range | ±4g or ±9g via g-Select pin - Allows dynamic sensitivity selection for high-resolution tilt (±4g) or high-g impact detection (±9g). |
| Bandwidth (XY) | 400 Hz typ - Matches human-motion frequency content for pedometer and gaming use cases. |
| Zero-g Output (25°C) | X/Y: 1.4 V, Z: 1.484 V at VDD = 2.8 V - Provides stable mid-supply reference for analog-to-digital conversion. |
| Self-Test Output Shift | X/Y: +0.05g, Z: +0.5g - Enables in-system verification of mechanical integrity and solder joint reliability pre-deployment. |
Pinout & Package
Package: 14-pin LGA (3 mm × 5 mm × 1.0 mm, Case 1977-01), RoHS-compliant, surface-mountable with solder-mask-defined footprint per Figure 8.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 9, 11, 12, 14 | N/C | No internal connection - Must remain unconnected; floating or tied to ground may disrupt internal biasing. |
| 2 (XOUT) | Analog Output | Ratiometric voltage proportional to X-axis acceleration (1.4 V @ 0g, ±0.308 V/g in 4g mode). |
| 3 (YOUT) | Analog Output | Ratiometric voltage proportional to Y-axis acceleration (1.4 V @ 0g, ±0.308 V/g in 4g mode). |
| 4 (ZOUT) | Analog Output | Ratiometric voltage proportional to Z-axis acceleration (1.484 V @ 0g, ±0.308 V/g in 4g mode). |
| 5 (VSS) | Ground Reference | Dedicated analog/digital ground return - requires low-impedance PCB plane beneath package. |
| 6 (VDD) | Power Input | 2.2–3.6 V supply with 0.1 μF decoupling capacitor - powers sensor cell and ASIC core. |
| 7 (Sleep) | Digital Control Input | Active-low logic input; low = Sleep Mode (3 μA), high = normal operation (400 μA). |
| 10 (g-Select) | Digital Control Input | Logic level selects full-scale range: low = ±4g (308 mV/g), high = ±9g (83.6 mV/g). |
| 13 (Self Test) | Digital Control Input | Pulse-high initiates electrostatic self-test; output shift confirms mechanical and electrical functionality. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Signal Conditioning | On-chip C-to-V conversion, gain, offset trim, and 1-pole switched-capacitor filter eliminate need for external op-amps or RC networks. |
| Ratiometric Output | Output offset and sensitivity scale linearly with VDD - enables system-level cancellation of supply rail noise during ADC sampling. |
| Factory-Calibrated Performance | Zero-g offset and sensitivity set at wafer test - no external trimming required, reducing BOM count and calibration labor. |
| Robust Mechanical Design | Rated for ±5000g shock survivability - withstands drop testing (1.8 m onto concrete) and board-level reflow stress without parameter shift. |
| Low-Power Sleep Architecture | 3 μA Sleep Mode current with sub-2 ms wake-up latency - supports duty-cycled sensing in energy-constrained IoT endpoints. |
Applications
| Hard Disk Drive (HDD) Protection | Laptop Anti-Theft & Freefall Detection |
|---|---|
Use Scenario: Detects sudden vertical acceleration loss indicating freefall to trigger HDD head parking before impact. IC Role / Device Role / Timing Role: Analog 3-axis motion sensor providing real-time g-level monitoring with <2 ms response latency. Use Value: Prevents data corruption and mechanical damage by enabling head retraction within 10 ms of freefall initiation. |
Use Scenario: Monitors orientation changes and abrupt drops during laptop transport or accidental release. IC Role / Device Role / Timing Role: Primary inertial sensor feeding motion events to host OS for auto-lock, encryption, or alarm activation. Use Value: Enables reliable anti-theft lockout and mechanical protection without external interrupt controllers or firmware polling overhead. |
| Mobile Phone Motion UI | Pedometer & Fitness Tracking |
Use Scenario: Enables tilt-based scrolling, motion dialing, and eCompass tilt compensation in smartphones. IC Role / Device Role / Timing Role: Low-latency analog motion capture source interfaced directly to baseband or application processor ADC. Use Value: Delivers sub-100 mg resolution and <1% nonlinearity for smooth UI responsiveness and accurate gesture recognition. |
Use Scenario: Captures step-induced vertical acceleration peaks in wearable bands and fitness trackers. IC Role / Device Role / Timing Role: Always-on motion detector operating in Sleep Mode between steps, waking on threshold-crossing events. Use Value: Achieves >7-day battery life using 3 μA Sleep Mode and configurable ±4g sensitivity optimized for human gait dynamics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-axis analog-output accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics LIS3LV02DL | 2.16–3.6 V supply; 300 μA active current; ±2g/±6g range; I²C interface only - no analog outputs. | Requires external ADC and digital interface logic; lacks g-Select and self-test pins. | Select when digital bus integration and smaller 3×3 mm QFN package are prioritized over analog simplicity. |
| Analog Devices ADXL335 | 1.8–3.6 V supply; 350 μA active current; fixed ±3g range; no Sleep Mode or g-Select; 300 Hz bandwidth. | Lower power but inflexible range; no low-power sleep state limits battery lifetime in intermittent-use devices. | Select when fixed-range, ultra-low-noise (300 μg/√Hz) performance is required and Sleep Mode is unnecessary. |
Compared with LIS3LV02DL and ADXL335, the MMA7331LCR2 uniquely combines analog output simplicity, dual-range flexibility via g-Select, and industry-leading 3 μA Sleep Mode - making it optimal for cost-sensitive, battery-constrained motion UI and freefall protection where minimal external components and rapid wake-up are essential.
Availability
MMA7331LCR2 is available at Aetrix Electronics and suitable for HDD protection, laptop freefall detection, and mobile motion UI requiring stable component supply across industrial temperature range (–40°C to +85°C) and long-lifecycle production programs.
Supply support for MMA7331LCR2 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
Freescale Semiconductor (now part of NXP Semiconductors) is a global leader in embedded processing and sensor solutions, specializing in automotive, industrial, and consumer microcontrollers and MEMS devices.
The MMA7331LCR2 belongs to Freescale's Xtrinsic™ family of intelligent sensors, engineered specifically for low-power, high-reliability motion sensing in portable consumer electronics - emphasizing integration, factory calibration, and drop-test robustness.
FAQ
What is the operating voltage range for the MMA7331LCR2?
The MMA7331LCR2 operates from 2.2 V to 3.6 V. Within this range, it maintains full specification compliance including calibrated offset, sensitivity, and bandwidth. Operation below 2.2 V or above 3.6 V may yield functional but uncalibrated output, and is not guaranteed per datasheet Table 2. The MMA7331LCR2 is designed for direct connection to common 2.5 V and 3.3 V logic rails without regulation.
How does the g-Select pin configure the MMA7331LCR2 sensitivity?
The g-Select pin (Pin 10) is a logic input that sets the MMA7331LCR2 full-scale range: a low signal selects ±4g (308 mV/g sensitivity), and a high signal selects ±9g (83.6 mV/g). The pin has an internal pull-down, so leaving it unconnected defaults the MMA7331LCR2 to ±4g mode. This allows runtime switching between ranges without hardware modification - critical for adaptive motion applications like gaming and fall detection.
What is the purpose of the Self Test pin on the MMA7331LCR2?
The Self Test pin (Pin 13) initiates an internal electrostatic actuation sequence that deflects the MEMS sensing element, producing known output shifts: +0.05g on X/Y axes and +0.5g on Z axis. This verifies both mechanical integrity (g-cell movement) and electrical signal chain (ASIC gain/offset) in-system, enabling field diagnostics and post-soldering validation of the MMA7331LCR2 without external test equipment.
Does the MMA7331LCR2 require external passive components for filtering?
No, the MMA7331LCR2 includes an onboard single-pole switched-capacitor filter driven by its internal 11 kHz clock. No external resistors or capacitors are needed to set cutoff frequency. However, a 3.3 nF capacitor is recommended on each analog output (XOUT/YOUT/ZOUT) to suppress clock feedthrough noise, and a 0.1 μF capacitor is required on VDD for power supply decoupling - both specified in the MMA7331LCR2 basic connection guidelines.
What is the significance of ratiometric output in the MMA7331LCR2?
Ratiometric output means the MMA7331LCR2's zero-g offset and sensitivity scale linearly with VDD supply voltage. As VDD increases, output voltage increases proportionally - for example, zero-g output rises from ~1.316 V at 2.2 V to ~1.484 V at 3.6 V. This cancels supply-induced errors when the MMA7331LCR2 and its downstream ADC share the same VDD rail, improving end-system accuracy without additional calibration.
MMA7331LCR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 14-TFLGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Analog
- Axis:
- X, Y, Z
- Acceleration Range:
- ±4g, 9g
- Sensitivity (LSB/g):
- -
- Sensitivity (mV/g):
- 308 (±4g) ~ 83.6 (±9g)
- Bandwidth:
- 400Hz (X,Y), 300Hz (Z)
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 2.2V ~ 3.6V
- Features:
- Selectable Scale
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-LGA (3x5)
MMA7331LCR2 FAQ
1.How can I place an order for MMA7331LCR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA7331LCR2 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 MMA7331LCR2 reliable?
The price and inventory of MMA7331LCR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA7331LCR2 is usually 5 days.
3.What payment methods are accepted for MMA7331LCR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA7331LCR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA7331LCR2?
MMA7331LCR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA7331LCR2 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 MMA7331LCR2?
For technical support, including MMA7331LCR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA7331LCR2 requirements.
6.How does Aetrix verify that MMA7331LCR2 is sourced from the original manufacturer or authorized distributors?
All MMA7331LCR2 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 MMA7331LCR2 meets industry standards.
7.What is the process for return or replacement of MMA7331LCR2?
All MMA7331LCR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA7331LCR2, 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 MMA7331LCR2 part is unused and in its original packaging.
Return procedure for MMA7331LCR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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