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NXP Semiconductors MMA7331LT
- Part No.:
- MMA7331LT
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 14-TFLGA
- Datasheet:
-
MMA7331LT.pdf
- Description:
- ACCELEROMETER 4-9G ANALOG 14LGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,377
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Product details
Overview
MMA7331LT from Freescale Semiconductor is a 3-axis capacitive MEMS accelerometer with integrated signal conditioning, selectable ±4g/±12g range, 3mm × 5mm × 1.0mm LGA-14 package, 400 µA active current, and Sleep Mode (3 µA). It delivers ratiometric analog outputs (XOUT/YOUT/ZOUT), features self-test and g-Select logic control, and is optimized for freefall detection in portable HDDs and motion-based user interfaces in smartphones.
For engineers reviewing the MMA7331LT datasheet, MMA7331LT pinout, MMA7331LT application, or MMA7331LT equivalent, key selection criteria include its dual-range sensitivity switching, low-power Sleep Mode timing (0.5 ms enable response), temperature-compensated offset stability, and compatibility with 2.2–3.6 V supply rails in space-constrained consumer electronics designs.
Technical Context
The MMA7331LT integrates a surface-micromachined polysilicon g-cell sensor with an ASIC containing switched-capacitor C-to-V conversion, a 1-pole low-pass filter (f−3dB = 24 Hz XY / 32 Hz Z), and NVM-trimmed gain/offset calibration. Its ratiometric output scales linearly with VDD, enabling direct interface to microcontroller ADCs without external reference.
Control logic accepts digital inputs on Sleep (Pin 7), g-Select (Pin 10), and Self Test (Pin 13) to dynamically configure operating mode, full-scale range, and mechanical integrity verification. The internal 11 kHz sampling clock drives the switched-capacitor filter, requiring external 3.3 nF output capacitors to suppress clock feedthrough.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.2 V – 3.6 V - Enables direct use with single Li-ion or dual-AA battery systems without regulation. |
| Active Current | 400 µA typ - Supports >100-hour operation on 40 mAh coin cell in intermittent-sensing applications. |
| Sleep Current | 3 µA typ - Reduces average power by >99% during idle periods in handheld devices. |
| Sensitivity Options | ±4g @ 308 mV/g or ±12g @ 83.6 mV/g - Selectable via logic level on Pin 10 for optimal SNR across motion-detection and shock-monitoring use cases. |
| Bandwidth | 24 Hz (XY), 32 Hz (Z) - Matches human-motion frequency content while rejecting high-frequency board vibration. |
| Zero-g Offset | 1.4 V @ VDD = 2.8 V - Midsupply output simplifies ADC zero-reference design and reduces common-mode rejection requirements. |
| Self Test Output Shift | +0.05g (XY), +0.8g (Z) - Provides deterministic mechanical deflection for post-soldering validation and field diagnostics. |
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 |
|---|---|---|
| Pin 1, 8, 9, 11, 12, 14 | No Connection | Internally unconnected - must remain floating; no PCB trace or pad required beyond mechanical support. |
| Pin 2 (XOUT) | Analog Output | Ratiometric voltage proportional to X-axis acceleration (0g = VDD/2); requires 3.3 nF capacitor to ground for noise filtering. |
| Pin 3 (YOUT) | Analog Output | Ratiometric voltage proportional to Y-axis acceleration; shares same scaling and filtering requirements as XOUT. |
| Pin 4 (ZOUT) | Analog Output | Ratiometric voltage proportional to Z-axis acceleration; exhibits slightly higher bandwidth (32 Hz) than XY axes. |
| Pin 5 (VSS) | Ground Reference | Dedicated analog ground return - must be connected to low-impedance system ground plane beneath the package. |
| Pin 6 (VDD) | Power Input | 2.2–3.6 V supply input; requires 0.1 µF ceramic decoupling capacitor placed within 2 mm of the pin. |
| Pin 7 (Sleep) | Digital Control Input | Active-low enable: logic low enters Sleep Mode (3 µA); logic high resumes normal operation (400 µA). |
| Pin 10 (g-Select) | Digital Control Input | Logic level selects full-scale range: low = ±4g (308 mV/g), high = ±12g (83.6 mV/g); internal pull-down defaults to 4g if left open. |
| Pin 13 (Self Test) | Digital Control Input | Pulse-high initiates electrostatic self-test; causes measurable output shift on all three axes for functional verification. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Signal Conditioning | On-chip C-to-V conversion, gain, and 1-pole low-pass filtering eliminate need for external op-amps or RC networks. |
| Ratiometric Output | Output offset and sensitivity scale linearly with VDD, removing supply-induced errors when interfaced to MCU ADCs. |
| Factory-Calibrated Zero-g Offset | Trimmed at wafer level - eliminates requirement for external trimming components or system-level calibration routines. |
| Temperature Compensation | X/Y/Z axis offset drift ≤ ±2 mg/°C and sensitivity drift ≤ ±0.0075 %/°C - maintains accuracy across −40°C to +85°C. |
| Robust Mechanical Design | Survives 5000 g shock and 1.8 m drop onto concrete - suitable for handheld and portable equipment environments. |
Applications
| Laptop PC Freefall Detection | HDD MP3 Player Protection |
|---|---|
Use Scenario: Detects sudden vertical acceleration loss indicating laptop freefall to trigger hard disk head parking before impact. IC Role / Device Role / Timing Role: Analog 3-axis motion sensor providing real-time acceleration data to host controller for immediate mechanical actuation. Use Value: Prevents data corruption and physical damage by initiating head retraction within <2 ms of freefall onset using built-in fast enable response. | Use Scenario: Monitors inertial state of portable music player during transport to preemptively park HDD actuator upon drop detection. IC Role / Device Role / Timing Role: Low-power motion monitor operating in Sleep Mode between samples, waking only on threshold-exceeding events. Use Value: Extends battery life via 3 µA Sleep Mode while maintaining sub-100 ms detection latency for 1.8 m drop scenarios. |
| Smartphone Motion UI | Pedometer Activity Tracking |
Use Scenario: Enables tilt-based screen rotation, motion-triggered text scrolling, and gesture-controlled dialing in mobile handsets. IC Role / Device Role / Timing Role: Primary orientation and dynamic motion sensor feeding real-time analog outputs to application processor ADC. Use Value: Delivers stable ±4g sensitivity mode with <1.0 ms power-up response for seamless UI responsiveness during device wake-from-sleep transitions. | Use Scenario: Captures step-induced vertical acceleration peaks to count steps and estimate distance traveled in wearable fitness trackers. IC Role / Device Role / Timing Role: Low-noise analog motion transducer with 350 µg/√Hz spectral density optimized for detecting 0.5–3 Hz gait frequencies. Use Value: Achieves accurate step counting over temperature range (−40°C to +85°C) using factory-trimmed offset and sensitivity with minimal drift. |
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 |
|---|---|---|---|
| ADXL335 | Wider supply range (1.8–3.6 V), higher noise floor (500 µg/√Hz), no Sleep Mode, fixed ±3g range | Lacks dynamic range switching and ultra-low-power sleep state - less suitable for battery-critical portable devices | Select ADXL335 only when fixed 3g range and broader supply tolerance outweigh need for power optimization and dual-range flexibility |
| KXSC7-2050 | Smaller 2 mm × 2 mm × 0.9 mm LGA, digital I²C output, 1.71–3.6 V supply, 10 µA Sleep Mode | Requires MCU firmware for digital interface and register configuration - adds software overhead vs. plug-and-play analog outputs | Choose KXSC7-2050 when board space is constrained and digital integration with existing I²C infrastructure justifies added firmware complexity |
Compared with ADXL335 and KXSC7-2050, the MMA7331LT uniquely balances analog simplicity, dual-range configurability, and sub-5 µA Sleep Mode - making it optimal for cost-sensitive, battery-powered motion UI and freefall protection where minimal BOM count and fast enable timing are critical.
Availability
MMA7331LT is available at Aetrix Electronics and suitable for laptop freefall detection, smartphone motion UI, and portable HDD protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for MMA7331LT 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) was a pioneer in MEMS sensor integration, delivering high-volume automotive and consumer-grade motion sensors with factory-trimmed analog performance.
The MMA7331L product line was engineered for ultra-low-power, space-constrained portable electronics - emphasizing rapid enable timing, robust shock survivability, and seamless analog interface to resource-limited microcontrollers.
FAQ
What is the supply voltage range supported by the MMA7331LT?
The MMA7331LT operates across a 2.2 V to 3.6 V supply range. Within this window, it maintains full calibration and specified performance including zero-g 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 specifications. For battery-powered designs, this range aligns directly with single-cell Li-ion (3.0–3.6 V) and alkaline/NiMH (2.4–3.2 V) configurations without regulation.
How does the g-Select feature work on the MMA7331LT?
The g-Select feature on the MMA7331LT uses Pin 10 to switch between two full-scale ranges: logic low selects ±4g (308 mV/g sensitivity), and logic high selects ±12g (83.6 mV/g). An internal pull-down ensures default 4g operation if Pin 10 is left unconnected. This allows dynamic range adaptation - e.g., using ±4g for fine motion UI gestures and ±12g for shock event detection - without hardware changes or recalibration.
What is the purpose of the Self Test function on the MMA7331LT?
The Self Test function on the MMA7331LT applies an electrostatic force to each axis via Pin 13 to verify mechanical and electrical integrity. It produces a known output shift: +0.05g on X/Y axes and +0.8g on Z axis. This enables post-assembly validation of solder joints and in-field diagnostics - critical for HDD protection systems where reliability must be confirmed throughout product lifetime without disassembly.
Can the MMA7331LT be used without external passive components?
Yes - the MMA7331LT requires only two external passive components for basic operation: a 0.1 µF ceramic capacitor from VDD to VSS (within 2 mm of Pin 6), and a 3.3 nF capacitor from each analog output (XOUT/YOUT/ZOUT) to VSS. These address power supply decoupling and switched-capacitor filter clock noise suppression. No resistors, op-amps, or trimming components are needed due to factory calibration and integrated signal conditioning.
What is the typical current consumption of the MMA7331LT in Sleep Mode?
The MMA7331LT draws 3 µA typical current in Sleep Mode, activated by applying a logic low to Pin 7 (Sleep). This reduces total system power by >99% compared to active operation (400 µA), extending battery life significantly in intermittently active applications like pedometers or motion-triggered wake-up systems. The 0.5 ms enable response time ensures rapid resumption of sensing without perceptible latency.
MMA7331LT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 14-TFLGA
- Packaging:
- Tray
- 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)
MMA7331LT FAQ
1.How can I place an order for MMA7331LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA7331LT 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 MMA7331LT reliable?
The price and inventory of MMA7331LT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA7331LT is usually 5 days.
3.What payment methods are accepted for MMA7331LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA7331LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA7331LT?
MMA7331LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA7331LT 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 MMA7331LT?
For technical support, including MMA7331LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA7331LT requirements.
6.How does Aetrix verify that MMA7331LT is sourced from the original manufacturer or authorized distributors?
All MMA7331LT 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 MMA7331LT meets industry standards.
7.What is the process for return or replacement of MMA7331LT?
All MMA7331LT units undergo pre-shipment inspection (PSI). If there is an issue with MMA7331LT, 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 MMA7331LT part is unused and in its original packaging.
Return procedure for MMA7331LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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