NXP Semiconductors MMA7341LCR2

Overview

MMA7341LCR2 from Freescale Semiconductor is a 3-axis capacitive MEMS accelerometer with integrated signal conditioning, selectable ±3g/±9g ranges, 400 μA active current, and Sleep Mode (3 μA). It delivers ratiometric analog outputs (XOUT/YOUT/ZOUT), features self-test and g-Select control, and targets handheld battery-powered motion sensing applications including freefall detection and tilt compensation.

For engineers reviewing the MMA7341LCR2 datasheet, MMA7341LCR2 pinout, MMA7341LCR2 application, or MMA7341LCR2 equivalent, key selection criteria include its LGA-14 package footprint, 0.5 ms enable response time, ±5000 g shock survivability, temperature-compensated offset and sensitivity, and compatibility with 2.2–3.6 V microcontroller interfaces requiring low-noise analog input conditioning.

Technical Context

The MMA7341LCR2 implements a surface-micromachined polysilicon g-cell with back-to-back variable capacitors, read via switched-capacitor ASIC circuitry. Its signal path includes a single-pole low-pass filter (1507 Hz typical with 3.3 nF external capacitor), internal 11 kHz sampling clock, and ratiometric output scaling proportional to VDD.

Control logic supports asynchronous Sleep Mode activation via pin 7 (low-active), g-range selection via pin 10 (0 = ±3g/440 mV/g, 1 = ±9g/117.8 mV/g), and self-test initiation via pin 13 - generating calibrated mechanical deflection verified by output voltage shift (ΔgSTXY = +0.05 g, ΔgSTZ = +1.0 g).

Key Specifications

Pinout & Package

Package: 3 mm × 5 mm × 1.0 mm LGA-14 (Case 1977-01), RoHS-compliant, surface-mountable with solder-mask-defined footprint per Figure 8.

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 MMA7341LCR2 uniquely combines analog ratiometric outputs, hardware-selectable sensitivity, and industry-leading 3 μA sleep current - making it optimal for cost-sensitive, battery-powered motion systems needing minimal firmware complexity and maximum runtime.

Availability

MMA7341LCR2 is available at Aetrix Electronics and suitable for laptop freefall protection, smartphone motion UI, HDD drop detection, pedometer step counting, and robotics motion sensing requiring stable component supply across industrial and consumer production volumes.

Supply support for MMA7341LCR2 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 semiconductor company specializing in embedded processing, sensors, and connectivity solutions for automotive, industrial, and consumer markets.

The MMA7341LCR2 belongs to Freescale's Xtrinsic™ family of intelligent sensors, designed specifically for ultra-low-power, high-reliability motion sensing in portable electronics where analog simplicity, shock resilience, and battery longevity are critical.

FAQ

What is the supply voltage range supported by the MMA7341LCR2?

The MMA7341LCR2 operates from 2.2 V to 3.6 V. Within this range, it maintains full calibration and linearity; operation outside these limits may yield uncalibrated output. The device is optimized for 3.3 V systems, where zero-g output is precisely 1.65 V and sensitivity is specified at 440 mV/g (±3g mode) or 117.8 mV/g (±9g mode). This matches standard microcontroller I/O voltage domains without requiring level translation.

How does the g-Select pin configure the MMA7341LCR2 sensitivity?

The g-Select pin (Pin 10) selects between ±3g and ±9g full-scale ranges: a logic low configures ±3g (440 mV/g), while a logic high configures ±9g (117.8 mV/g). The pin has an internal pull-down resistor, so leaving it unconnected defaults the MMA7341LCR2 to ±3g mode. This hardware-selectable feature allows dynamic range adaptation without firmware changes - ideal for products serving multiple motion-detection use cases.

What is the purpose of the Self Test pin on the MMA7341LCR2?

The Self Test pin (Pin 13) initiates an electrostatic self-test that deflects the internal MEMS structure to verify mechanical and electrical functionality. When asserted, it produces a known output shift: +0.05 g on X/Y axes and +1.0 g on the Z-axis. This enables pre-deployment validation and field diagnostics - especially critical in HDD protection systems where accelerometer failure could result in data loss. No external equipment is needed beyond a logic pulse.

Can the MMA7341LCR2 be used without external filtering components?

Yes - the MMA7341LCR2 integrates a switched-capacitor low-pass filter, eliminating the need for external RC networks to set cutoff frequency. However, Freescale recommends a 3.3 nF capacitor on each analog output (XOUT/YOUT/ZOUT) to suppress internal clock noise, and a 0.1 μF capacitor on VDD for power supply decoupling. These are not filter-setting components but noise mitigation elements required for specified performance (e.g., 400 Hz bandwidth, 350 μg/√Hz noise density).

What is the significance of ratiometric output in the MMA7341LCR2?

Ratiometric output means both zero-g offset and sensitivity scale linearly with VDD - e.g., at 2.2 V supply, zero-g is ~1.1 V and sensitivity scales proportionally. This cancels supply-induced errors when the MMA7341LCR2 and the downstream ADC share the same VDD rail, as common-mode supply variation affects both reference and signal equally. It simplifies system-level calibration and improves measurement accuracy in cost-sensitive designs without dedicated voltage references.