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NXP Semiconductors MMA7341LT
- Part No.:
- MMA7341LT
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 14-TFLGA
- Datasheet:
-
MMA7341LT.pdf
- Description:
- ACCELEROMETER 3-11G ANALOG 14LGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,981
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Product details
Overview
MMA7341LT from Freescale Semiconductor is a 3-axis capacitive MEMS accelerometer with integrated signal conditioning, selectable ±3g/±11g full-scale range, factory-trimmed zero-g offset and sensitivity, and Sleep Mode for ultra-low-power operation. It delivers ratiometric analog outputs (XOUT/YOUT/ZOUT), features self-test capability, internal low-pass filtering, and operates from 2.2 V to 3.6 V - ideal for freefall detection in HDD protection and motion-based user interfaces.
For engineers reviewing the MMA7341LT datasheet, MMA7341LT pinout, MMA7341LT application, or MMA7341LT equivalent, key selection criteria include its LGA-14 package footprint, 400 μA active current, 3 μA Sleep Mode, g-Select logic-controlled sensitivity switching, and ±5000 g shock survivability - all critical for battery-powered portable electronics design.
Technical Context
The MMA7341LT integrates a surface-micromachined polysilicon g-cell sensor with an ASIC performing switched-capacitor C-to-V conversion, temperature compensation, and single-pole low-pass filtering. Its output is ratiometric to VDD, ensuring system-level cancellation of supply-induced ADC errors.
Control logic enables real-time mode switching: g-Select (Pin 10) selects gain (440 mV/g at ±3g or 117.5 mV/g at ±11g); Sleep (Pin 7) reduces current to 3 μA; Self Test (Pin 13) applies electrostatic force to verify mechanical and electrical integrity per axis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±3g or ±11g - selected via logic level on g-Select pin; enables dual-mode operation without external components |
| Supply Voltage | 2.2 V – 3.6 V - supports direct connection to common Li-ion/Li-poly battery rails and 3.3 V logic domains |
| Active Current | 400 μA typ - enables >100-hour operation on 40 mAh coin cell in motion-triggered wake-up systems |
| Sleep Current | 3 μA typ - allows multi-month standby in anti-theft laptop applications with periodic self-test polling |
| Bandwidth (XY) | 400 Hz - sufficient for human-motion sensing (e.g., pedometer, tilt UI) while rejecting high-frequency vibration noise |
| Zero-g Output | 1.65 V at VDD = 3.3 V - centered at midsupply for symmetric ±g measurement with single-supply ADCs |
| Self-Test Response | +0.05g (XY), +0.8g (Z) - provides deterministic mechanical verification without external stimulus equipment |
Pinout & Package
Package: 3 mm × 5 mm × 1.0 mm LGA-14 (Case 1977-01), RoHS-compliant, surface-mountable with solder-mask-defined pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 9, 11, 12, 14 | No Connect (N/C) | Internally unconnected; must remain floating - no PCB trace or pad required |
| 2 (XOUT) | Analog X-Axis Output | Ratiometric voltage output (midsupply ± sensitivity × g); requires 3.3 nF capacitor to suppress clock noise |
| 3 (YOUT) | Analog Y-Axis Output | Identical behavior to XOUT; enables independent 3D orientation tracking with microcontroller ADC |
| 4 (ZOUT) | Analog Z-Axis Output | Same ratiometric scaling; Z-axis self-test deflection calibrated to ~1g for diagnostic confidence |
| 5 (VSS) | Ground Reference | Must connect to low-impedance ground plane beneath device to minimize noise coupling |
| 6 (VDD) | Power Supply Input | Requires 0.1 μF ceramic decoupling capacitor placed within 2 mm of pin |
| 7 (Sleep) | Active-Low Sleep Enable | Pull low to enter 3 μA Sleep Mode; pull high or leave floating (internal pull-up) for normal operation |
| 10 (g-Select) | Sensitivity Select Input | Logic low = ±3g (440 mV/g); logic high = ±11g (117.5 mV/g); internal pull-down defaults to 3g mode |
| 13 (Self Test) | Self-Test Activation | Pulse high to initiate electrostatic self-test; output shifts predictably for pass/fail validation |
Key Features
| Feature | Design Value |
|---|---|
| Ratiometric Output | Output offset and sensitivity scale linearly with VDD - eliminates need for separate voltage reference in ADC interface |
| Factory-Trimmed Calibration | Zero-g offset and sensitivity set during wafer test - no external trimming resistors or calibration firmware required |
| Integrated Low-Pass Filter | Single-pole switched-capacitor filter (400 Hz XY / 300 Hz Z) - no external RC components needed for anti-aliasing |
| Temperature Compensation | X/Y/Z offset drift ≤ ±2 mg/°C; sensitivity drift ≤ ±0.0075 %/°C - maintains accuracy across -40°C to +85°C |
| Robust Shock Survivability | Withstands ±5000 g mechanical shock - survives drop tests from 1.8 m onto concrete per JEDEC standards |
Applications
| Laptop Freefall Protection | HDD MP3 Player Drop Detection |
|---|---|
Use Scenario: Detects sudden vertical acceleration loss indicating laptop freefall to park HDD heads before impact. IC Role / Device Role / Timing Role: Analog 3-axis motion sensor providing real-time g-vector magnitude and direction for inertial trigger logic. Use Value: Enables <10 ms response time from freefall onset to head parking, validated per IBM/Hitachi HDD protection specs. | Use Scenario: Monitors acceleration discontinuity during handheld MP3 player drops to disable write operations. IC Role / Device Role / Timing Role: Low-power motion monitor operating in Sleep Mode (3 μA), waking only on threshold-exceeding events. Use Value: Prevents data corruption during 1.8 m concrete-drop scenarios without draining battery between events. |
| Mobile Phone Motion UI | Pedometer Step Counting |
Use Scenario: Enables text scrolling, motion dialing, and e-compass tilt compensation via tilt-angle derivation. IC Role / Device Role / Timing Role: High-fidelity analog sensor feeding MCU ADC with 440 mV/g sensitivity and <1% nonlinearity. Use Value: Delivers sub-degree tilt resolution at ±3g range, supporting smooth UI responsiveness without motion lag. | Use Scenario: Captures vertical hip acceleration peaks during walking/running to count steps algorithmically. IC Role / Device Role / Timing Role: Bandwidth-limited (400 Hz) analog front-end rejecting high-frequency noise while preserving step transient shape. Use Value: Achieves >95% step detection accuracy across 1–200 steps/min using onboard low-pass filtering and stable zero-g baseline. |
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 (300 μg/√Hz vs. 350 μg/√Hz), no g-Select or Sleep Mode | Lacks programmable sensitivity and ultra-low-power sleep - less suitable for battery-critical freefall detection | Select ADXL335 only when broader voltage compatibility outweighs power and configurability needs |
| KXSC7-2050 | Lower active current (200 μA), digital I²C output, integrated FIFO, but no analog outputs or self-test | Requires MCU with I²C and firmware for data parsing - not drop-in for analog ADC designs | Choose KXSC7-2050 when digital interface, lower power, and embedded features justify redesign effort |
Compared with ADXL335 and KXSC7-2050, the MMA7341LT uniquely combines analog ratiometric outputs, hardware-selectable sensitivity, and 3 μA Sleep Mode - making it optimal for cost-sensitive, battery-constrained systems requiring minimal MCU intervention and proven field reliability in HDD/laptop protection.
Availability
MMA7341LT is available at Aetrix Electronics and suitable for laptop anti-theft systems, portable media player drop protection, and mobile phone motion UIs requiring stable component supply across extended production lifecycles.
Supply support for MMA7341LT 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-reliability analog and mixed-signal ICs for automotive, industrial, and consumer markets.
The MMA7341L product line was engineered specifically for portable electronics requiring robust, low-power, factory-calibrated motion sensing - targeting HDD protection, tilt UI, and pedometer applications before the rise of digital IMUs.
FAQ
What is the supply voltage range for the MMA7341LT?
The MMA7341LT operates from 2.2 V to 3.6 V. Within this range, it functions as a fully calibrated linear accelerometer; operation outside these limits may yield uncalibrated output. The device's ratiometric architecture ensures output scaling with VDD, simplifying interface to 3.3 V microcontrollers and eliminating need for external voltage references. This range aligns directly with single-cell Li-ion and Li-poly battery discharge profiles.
How does the g-Select feature work on the MMA7341LT?
The g-Select pin (Pin 10) configures the MMA7341LT's full-scale range: logic low selects ±3g (440 mV/g sensitivity), logic high selects ±11g (117.5 mV/g). An internal pull-down ensures default ±3g operation if the pin is left unconnected. This hardware-selectable gain allows dynamic adaptation - e.g., high-sensitivity mode for pedometer use and low-sensitivity mode for shock detection - without firmware overhead or external components.
What is the purpose of the Self Test function on the MMA7341LT?
The Self Test function on the MMA7341LT applies an electrostatic force to each axis via Pin 13, inducing predictable output shifts (+0.05g on X/Y, +0.8g on Z) to verify mechanical and electrical integrity. This enables pre-deployment validation and in-field diagnostics - critical for HDD protection where failure could cause data loss. Unlike software-based checks, it confirms g-cell mobility and ASIC signal path functionality without external equipment.
Can the MMA7341LT be used in battery-powered devices with long standby life?
Yes - the MMA7341LT supports ultra-low-power operation via its Sleep Mode, drawing just 3 μA typical when Pin 7 is pulled low. Combined with factory-trimmed calibration and no external components, it enables multi-month standby in applications like laptop anti-theft, where periodic wake-up and self-test can occur without depleting small batteries. Its 2.2 V minimum supply also extends usable battery life into deep discharge.
What are the recommended external components for the MMA7341LT analog outputs?
Each analog output (XOUT/YOUT/ZOUT) requires a 3.3 nF capacitor to ground to suppress switched-capacitor filter clock noise, and the VDD pin requires a 0.1 μF ceramic decoupling capacitor placed within 2 mm. A 10 MΩ or higher input impedance is recommended at the ADC input to avoid loading the internal 32 kΩ output resistor. These values are specified in Freescale AN3447 and ensure bandwidth control and noise immunity without custom tuning.
MMA7341LT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 14-TFLGA
- Packaging:
- Bag
- Product Status:
- Obsolete
- Type:
- Analog
- Axis:
- X, Y, Z
- Acceleration Range:
- ±3g, 11g
- Sensitivity (LSB/g):
- -
- Sensitivity (mV/g):
- 440 (±3g) ~ 117.8 (±9g)
- Bandwidth:
- 400Hz (X,Y), 300Hz (Z)
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 2.2V ~ 3.6V
- Features:
- Selectable Scale, Sleep Mode
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-LGA (3x5)
MMA7341LT FAQ
1.How can I place an order for MMA7341LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA7341LT 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 MMA7341LT reliable?
The price and inventory of MMA7341LT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA7341LT is usually 5 days.
3.What payment methods are accepted for MMA7341LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA7341LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA7341LT?
MMA7341LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA7341LT 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 MMA7341LT?
For technical support, including MMA7341LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA7341LT requirements.
6.How does Aetrix verify that MMA7341LT is sourced from the original manufacturer or authorized distributors?
All MMA7341LT 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 MMA7341LT meets industry standards.
7.What is the process for return or replacement of MMA7341LT?
All MMA7341LT units undergo pre-shipment inspection (PSI). If there is an issue with MMA7341LT, 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 MMA7341LT part is unused and in its original packaging.
Return procedure for MMA7341LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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