NXP Semiconductors MMA7341LCT

Overview

MMA7341LCT 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 logic control, and targets battery-powered motion sensing in handheld electronics.

For engineers reviewing the MMA7341LCT datasheet, MMA7341LCT pinout, MMA7341LCT application, or MMA7341LCT equivalent, key selection criteria include its LGA-14 package footprint, 0.5 ms enable response time, ±5000g shock survivability, and compatibility with 2.2–3.6 V supply rails in space-constrained portable designs.

Technical Context

The MMA7341LCT integrates a surface-micromachined polysilicon g-cell sensor with an ASIC implementing switched-capacitor C-to-V conversion, 1-pole low-pass filtering, temperature compensation, and NVM-trimmed offset/sensitivity calibration. Its output voltage is ratiometric to VDD, enabling direct interface with microcontroller ADCs without external reference.

Control logic responds to 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, with output bandwidths of 400 Hz (XY) and 300 Hz (Z) under recommended 3.3 nF external filtering.

Key Specifications

Pinout & Package

Package: 3 mm × 5 mm × 1.0 mm LGA-14 (Case 1977-01), bottom-terminal land grid array with exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL335BCPZ and KXSC7-2050, the MMA7341LCT uniquely balances analog simplicity, dual-range flexibility, and sub-5 μA sleep power - making it optimal for cost-sensitive, space-constrained portable devices needing immediate wake-on-motion without digital protocol overhead.

Availability

MMA7341LCT 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 industrial-grade availability.

Supply support for MMA7341LCT 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 MMA7341LCT belongs to Freescale's Xtrinsic™ family of intelligent sensors, designed specifically for ultra-low-power motion awareness in portable electronics where size, battery life, and analog integration are critical constraints.

FAQ

What is the supply voltage range supported by the MMA7341LCT?

The MMA7341LCT operates from 2.2 V to 3.6 V DC. Within this range, it maintains full calibration and specified performance including offset, sensitivity, and bandwidth. Operation below 2.2 V or above 3.6 V may result in undefined behavior or permanent damage, as confirmed by the Absolute Maximum Ratings table in the official datasheet. The MMA7341LCT's ratiometric output ensures consistent scaling across this entire voltage window without external reference components.

How does the g-Select pin configure the MMA7341LCT's measurement range?

The g-Select pin (pin 10) is a logic input that selects between ±3g (440 mV/g) and ±9g (117.8 mV/g) full-scale ranges. A low logic level configures ±3g for high-resolution motion detection, while a high level selects ±9g for wider dynamic range. If left unconnected, the internal pull-down defaults the MMA7341LCT to ±3g mode. This configuration is active immediately upon power-up and can be changed dynamically during operation without reset.

What is the purpose of the Sleep pin on the MMA7341LCT, and how is it used?

The Sleep pin (pin 7) is an active-low digital control input that places the MMA7341LCT into ultra-low-power Sleep Mode (3 μA typical) when driven low, disabling all analog outputs. Driving it high resumes normal operation with 400 μA typical current draw and valid outputs within 0.5 ms. No internal pull-up exists, so external logic or MCU GPIO must actively drive the pin. This feature enables duty-cycled operation in battery-powered devices such as pedometers and mobile phones using the MMA7341LCT.

Can the MMA7341LCT be used without external filtering components?

The MMA7341LCT requires external 3.3 nF capacitors on each analog output (XOUT/YOUT/ZOUT) to suppress switched-capacitor clock noise, as specified in the datasheet's "Basic Connections" section. While the internal filter sets bandwidth, omitting these capacitors results in measurable 11 kHz ripple on outputs, degrading ADC accuracy. A 0.1 μF capacitor on VDD is also mandatory for power rail decoupling. Therefore, the MMA7341LCT cannot be used reliably without these two external components per the validated reference design.

What is the maximum mechanical shock the MMA7341LCT can survive without damage?

The MMA7341LCT is rated for ±5000 g mechanical shock across all axes, as defined in the Absolute Maximum Ratings table. This specification reflects survivability during handling, drop testing (e.g., 1.8 m onto concrete), and board-level reflow - not operational measurement range. The device maintains calibration integrity after such events due to its hermetically sealed wafer-level packaging and robust polysilicon g-cell structure, ensuring long-term reliability in rugged portable applications using the MMA7341LCT.