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NXP Semiconductors MMA7340LT
- Part No.:
- MMA7340LT
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 14-TFLGA
- Datasheet:
-
MMA7340LT.pdf
- Description:
- ACCELEROMETER 3-11G ANALOG 14LGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,035
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Product details
Overview
MMA7340LT from Freescale Semiconductor is a 3-axis capacitive MEMS accelerometer with integrated signal conditioning, selectable ±3g/±11g range, 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 targets motion-sensing applications in battery-powered portable electronics.
For engineers reviewing the MMA7340LT datasheet, MMA7340LT pinout, MMA7340LT application, or MMA7340LT equivalent, this device requires attention to its LGA-14 package layout, g-Select voltage logic level, Sleep Mode enable timing (0.5 ms), self-test response (2.0 ms), and output bandwidth dependency on external RC filtering.
Technical Context
The MMA7340LT integrates a surface-micromachined polysilicon g-cell sensor with an ASIC containing switched-capacitor C-to-V conversion, temperature-compensated gain control, and a single-pole low-pass filter. Its internal NVM trims zero-g offset and sensitivity at factory calibration.
Signal path includes independent X/Y/Z sensing elements with shared clock generation (11 kHz sampling), ratiometric output scaling, and electrostatic self-test actuation applied per axis. The g-Select pin dynamically reconfigures gain without interrupting operation, while Sleep Mode disables analog outputs and reduces current via digital control of internal bias circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.2 V – 3.6 V: Fully calibrated linear operation only within this range; outside it, functionality is not guaranteed. |
| Active Current | 400 μA typical: Enables >1-year battery life in low-duty-cycle handheld devices powered by coin cells. |
| Sleep Current | 3 μA typical: Reduces power consumption by 133× versus active mode for extended idle periods. |
| Sensitivity Options | ±3g @ 440 mV/g or ±11g @ 117.5 mV/g: Selected via logic level on g-Select pin; internal pull-down defaults to 3g mode. |
| Output Type | Ratiometric analog voltage: Output offset (1.65 V @ 0g) and sensitivity scale linearly with VDD, enabling supply-noise rejection in ADC interfaces. |
| Bandwidth | XY: 300 Hz / Z: 32 Hz (with recommended 3.3 nF capacitor): Matches human-motion frequency content while suppressing clock noise. |
| Self-Test Response | X/Y: +0.05g to +1.0g / Z: +0.8g to +1.2g step: Verifies mechanical integrity and signal chain continuity before system deployment. |
Pinout & Package
Package: 3 mm × 5 mm × 1.0 mm LGA-14 (Case 1935-01), bottom-terminal land grid array with exposed die pad for thermal and mechanical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 9, 11, 12, 14 | No Connect (N/C) | Internally unconnected; must remain floating or grounded per PCB layout best practices to avoid noise coupling. |
| 2 (XOUT) | Analog Output - X Axis | DC-coupled ratiometric voltage (1.65 V @ 0g); requires 3.3 nF capacitor to suppress 11 kHz clock feedthrough. |
| 3 (YOUT) | Analog Output - Y Axis | Identical electrical behavior to XOUT; used with XOUT for tilt calculation or motion vector decomposition. |
| 4 (ZOUT) | Analog Output - Z Axis | Lower bandwidth (32 Hz) than X/Y; optimized for gravity detection and freefall event triggering. |
| 5 (VSS) | Ground Reference | Must connect to low-impedance ground plane beneath device; decoupling capacitor (0.1 μF) required at VDD pin. |
| 6 (VDD) | Power Supply Input | Accepts 2.2–3.6 V; output ratiometricity ties all analog performance directly to this rail's stability. |
| 7 (Sleep) | Digital Control Input | Low = Sleep Mode (3 μA); high = active mode; 0.5 ms enable response time defines minimum wake-up latency. |
| 10 (g-Select) | Sensitivity Selection | Logic low = ±3g (440 mV/g); logic high = ±11g (117.5 mV/g); internal pull-down ensures default 3g operation if left open. |
| 13 (Self Test) | Diagnostic Activation | Pulse-high initiates electrostatic deflection; output step confirms both sensor element and ASIC signal path functionality. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Signal Conditioning | On-die ASIC performs C-to-V conversion, temperature compensation, and filtering-eliminates need for external op-amps or discrete filters. |
| Selectable Full-Scale Range | Hardware-selectable ±3g/±11g via single logic pin enables one BOM to support multiple motion-detection thresholds across product variants. |
| Ultra-Low Sleep Current | 3 μA quiescent draw allows integration into always-on motion wake-up systems without compromising battery lifetime. |
| Self-Test with Axis-Specific Response | Verified mechanical and electrical integrity per axis using electrostatic actuation-critical for HDD drop protection and anti-theft deployments. |
| Ratiometric Output Architecture | Output offset and sensitivity scale with VDD, enabling direct connection to microcontroller ADCs without reference voltage matching or supply regulation overhead. |
Applications
| Laptop Freefall Protection | HDD MP3 Player Drop Detection |
|---|---|
Use Scenario: Detects sudden vertical acceleration loss during laptop drop to park hard drive heads before impact. IC Role / Device Role / Timing Role: Z-axis dominant gravity vector monitor with 32 Hz bandwidth optimized for freefall signature recognition. Use Value: Prevents data corruption and mechanical damage by triggering head parking within <20 ms of drop initiation. |
Use Scenario: Identifies uncontrolled descent in portable audio players to disable write operations and protect flash memory. IC Role / Device Role / Timing Role: Low-power Z-axis event detector operating in Sleep Mode until acceleration threshold breach. Use Value: Achieves <100 ms total response from drop onset to memory protection activation using 3 μA standby current. |
| Mobile Phone Motion UI | Pedometer Step Counting |
Use Scenario: Enables text scrolling, image stabilization, and motion dialing via tilt and gesture recognition in smartphones. IC Role / Device Role / Timing Role: Simultaneous X/Y/Z analog output source feeding MCU ADC at ≥100 Hz for real-time orientation estimation. Use Value: Delivers sub-degree tilt resolution using ±3g mode and 440 mV/g sensitivity, supporting smooth UI transitions. |
Use Scenario: Captures vertical hip acceleration peaks during walking/running to count steps and estimate distance. IC Role / Device Role / Timing Role: High-SNR motion transducer with 300 Hz XY bandwidth capturing transient g-peaks above 0.3g threshold. Use Value: Supports accurate step detection down to 0.5 Hz cadence using factory-trimmed zero-g offset (<±2 mg drift over temperature). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-axis analog-output MEMS 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 Sleep Mode or g-Select. | Lacks power-gating and dual-range flexibility; suited for always-on industrial monitoring but not battery-constrained UI. | Select ADXL335 when ultra-low voltage operation or absence of digital control pins simplifies system design. |
| KXSC7-2050 | Smaller 2 mm × 2 mm DFN package, I²C interface only, fixed ±2g range, 1.71–3.6 V supply, 10 μA Sleep current. | Digital output eliminates ADC requirement but adds firmware overhead; lacks analog flexibility for custom filtering or mixed-signal processing. | Select KXSC7-2050 when board space is critical and microcontroller has I²C resources available for configuration. |
Compared with ADXL335 and KXSC7-2050, the MMA7340LT uniquely combines analog output fidelity, hardware-selectable range, and industry-leading 3 μA Sleep current-making it optimal for cost-sensitive, battery-powered consumer motion interfaces requiring minimal external components.
Availability
MMA7340LT is available at Aetrix Electronics and suitable for laptop freefall protection, mobile phone motion UI, and pedometer step counting requiring stable component supply and long-term production continuity.
Supply support for MMA7340LT 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) specialized in embedded controllers and sensors for automotive, industrial, and consumer applications before its 2015 acquisition.
The MMA7340LT belongs to Freescale's early-generation MEMS accelerometer family designed specifically for low-power, high-reliability motion sensing in portable consumer electronics with minimal external circuitry.
FAQ
What is the function of the g-Select pin on the MMA7340LT?
The g-Select pin on the MMA7340LT is a logic input that selects full-scale range: low = ±3g (440 mV/g), high = ±11g (117.5 mV/g). An internal pull-down ensures MMA7340LT defaults to ±3g mode if the pin is left unconnected. This hardware-selectable feature avoids firmware configuration overhead and supports dynamic range switching during operation.
How does the MMA7340LT achieve its 3 μA Sleep Mode current?
The MMA7340LT achieves 3 μA Sleep Mode current by disabling its internal oscillator, C-to-V converter, and analog output buffers while retaining bias circuitry for fast wake-up. Pin 7 (Sleep) must be driven low; the 0.5 ms enable response time reflects the time needed to restore full analog signal chain operation after wake-up.
Can the MMA7340LT be used without external capacitors?
No-the MMA7340LT requires a 0.1 μF capacitor between VDD and VSS for power supply decoupling, and 3.3 nF capacitors on each analog output (XOUT/YOUT/ZOUT) to suppress 11 kHz clock noise from the internal switched-capacitor filter. Omitting these violates the recommended connection diagram and degrades noise performance and bandwidth accuracy.
What is the significance of ratiometric output in the MMA7340LT?
Ratiometric output means the MMA7340LT's zero-g offset (1.65 V) and sensitivity (e.g., 440 mV/g) scale linearly with VDD. This allows direct interfacing with microcontroller ADCs using the same VDD as reference, eliminating errors from supply voltage variation and removing the need for a separate precision voltage reference.
How is self-test implemented in the MMA7340LT and what does it verify?
The MMA7340LT self-test applies electrostatic force to deflect the MEMS sensing mass: X/Y axes shift +0.05g to +1.0g, Z-axis shifts +0.8g to +1.2g. This verifies mechanical integrity of the g-cell and end-to-end functionality of the ASIC signal chain-including C-to-V conversion, amplification, and output buffering-without requiring external test equipment.
MMA7340LT 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:
- ±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)
MMA7340LT FAQ
1.How can I place an order for MMA7340LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA7340LT 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 MMA7340LT reliable?
The price and inventory of MMA7340LT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA7340LT is usually 5 days.
3.What payment methods are accepted for MMA7340LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA7340LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA7340LT?
MMA7340LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA7340LT 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 MMA7340LT?
For technical support, including MMA7340LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA7340LT requirements.
6.How does Aetrix verify that MMA7340LT is sourced from the original manufacturer or authorized distributors?
All MMA7340LT 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 MMA7340LT meets industry standards.
7.What is the process for return or replacement of MMA7340LT?
All MMA7340LT units undergo pre-shipment inspection (PSI). If there is an issue with MMA7340LT, 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 MMA7340LT part is unused and in its original packaging.
Return procedure for MMA7340LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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