NXP Semiconductors MMA7341LR2

Overview

MMA7341LR2 from Freescale Semiconductor is a 3-axis capacitive micromachined accelerometer with integrated signal conditioning, selectable ±3g/±11g full-scale range, 400 μA active current, and 3 μA sleep mode-designed for motion sensing and freefall detection in battery-powered portable electronics.

For engineers reviewing the MMA7341LR2 datasheet, MMA7341LR2 pinout, MMA7341LR2 application, or MMA7341LR2 equivalent, key selection criteria include g-select logic configuration, analog output ratiometricity (VDD-dependent offset/sensitivity), self-test response timing (2.0 ms), and LGA-14 package thermal and mechanical mounting constraints per AN3484.

Technical Context

The MMA7341LR2 implements a surface-micromachined polysilicon g-cell with back-to-back variable capacitors, read via switched-capacitor ASIC circuitry that delivers ratiometric analog voltage outputs (XOUT/YOUT/ZOUT) proportional to acceleration. Its internal 1-pole low-pass filter has programmable bandwidth (400 Hz XY / 300 Hz Z) determined by internal 32 kΩ resistor and external capacitor.

Control logic supports real-time g-range switching via g-Select pin (0 = ±3g @ 440 mV/g; 1 = ±11g @ 117.5 mV/g), Sleep Mode activation (pin 7 low), and Self Test initiation (pin 13 high), all with defined response times (0.5 ms enable, 2.0 ms self-test). Temperature compensation is factory-trimmed for offset and sensitivity across –40°C to +85°C.

Key Specifications

Pinout & Package

Package: 3 mm × 5 mm × 1.0 mm LGA-14 (Case 1977-01), bottom-terminal land grid array with exposed die pad for thermal and mechanical stability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-axis analog-output accelerometer applications.

Compared with ADXL335BCPZ and KXSC7-2050, the MMA7341LR2 uniquely balances analog simplicity, dual-range flexibility, and sub-10 μA low-power states-making it optimal for cost-sensitive, battery-constrained devices requiring both motion UI and mechanical event detection without digital bus overhead.

Availability

MMA7341LR2 is available at Aetrix Electronics and suitable for laptop freefall protection, portable media player shock mitigation, and smartphone motion-sensing applications requiring stable component supply across extended production lifecycles.

Supply support for MMA7341LR2 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-emphasizing drop survivability, ratiometric analog outputs, and minimal external component count.

FAQ

What is the recommended external capacitor value for MMA7341LR2 analog outputs?

The MMA7341LR2 datasheet specifies a 3.3 nF capacitor on each of XOUT, YOUT, and ZOUT to suppress internal clock noise from the switched-capacitor filter. This value yields a 1507 Hz cutoff-well above the device's 400 Hz (XY) and 300 Hz (Z) signal bandwidth-ensuring clean analog signals without attenuating valid motion data. Using smaller values risks increased noise; larger values reduce bandwidth and may distort fast transients.

Does MMA7341LR2 require external zero-g trim components?

No, the MMA7341LR2 does not require external zero-g trim components. Freescale factory-trims zero-g offset and sensitivity during production, achieving ±0.5 V offset tolerance at 25°C and maintaining stability across –40°C to +85°C. However, PCB reflow-induced stress can shift offset; AN3484 recommends specific footprint geometry and symmetric thermal mass to limit post-mounting drift to <50 mg.

How does the g-Select pin function on MMA7341LR2?

The g-Select pin (Pin 10) configures MMA7341LR2'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 ±3g mode if the pin is left unconnected. Switching occurs dynamically during operation-no reset or recalibration needed-and affects only gain; offset remains centered at VDD/2 regardless of range.

What is the maximum mechanical shock MMA7341LR2 can survive?

The MMA7341LR2 is rated for ±5000 g mechanical shock across all axes, verified per MIL-STD-883H Method 2002. It also passes 1.8 m drop tests onto concrete from any orientation (per JEDEC JESD22-B111). This ruggedness stems from its hermetically sealed surface-micromachined g-cell and robust LGA-14 package construction-critical for handheld and wearable applications subject to accidental impacts.

Can MMA7341LR2 operate from a 1.8 V supply?

No, the MMA7341LR2 cannot operate from a 1.8 V supply. Its absolute minimum supply voltage is 2.2 V, and maximum is 3.6 V. Operation below 2.2 V risks undefined behavior, including incorrect zero-g offset, reduced sensitivity, or failure to exit Sleep Mode. For 1.8 V systems, consider alternatives like the KXSC7-2050 or LIS3DH, which support lower voltage rails while maintaining 3-axis functionality.