NXP Semiconductors MMA7340LR2

Overview

MMA7340LR2 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 handheld battery-powered motion sensing applications including freefall detection in HDD MP3 players and laptops.

For engineers reviewing the MMA7340LR2 datasheet, MMA7340LR2 pinout, MMA7340LR2 application, or MMA7340LR2 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 electronics designs.

Technical Context

The MMA7340LR2 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 clock operates at 11 kHz, enabling real-time acceleration measurement without external timing components.

Signal path includes factory-trimmed zero-g offset and sensitivity, ratiometric output scaling with VDD, and independent axis outputs buffered by 32 kΩ internal resistors. The g-Select pin (Pin 10) configures gain digitally, while Self Test (Pin 13) applies electrostatic force to verify mechanical and electrical integrity across all three axes.

Key Specifications

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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL335 and KXSC7-2050, the MMA7340LR2 uniquely combines analog ratiometric outputs, sub-5 μA sleep, and ±3g/±11g selectability in a 3×5 mm LGA - making it optimal for cost-sensitive, battery-limited motion-triggered systems needing minimal external components.

Availability

MMA7340LR2 is available at Aetrix Electronics and suitable for laptop freefall detection, portable HDD protection, mobile phone motion dialing, and pedometer motion sensing requiring stable component supply across industrial temperature ranges.

Supply support for MMA7340LR2 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 mixed-signal ICs for automotive, industrial, and consumer applications before its 2015 acquisition.

The MMA7340L family was designed specifically for ultra-low-power, space-constrained portable electronics - emphasizing analog simplicity, factory calibration, and robust mechanical survivability in handheld devices.

FAQ

What is the operating temperature range for the MMA7340LR2?

The MMA7340LR2 is specified for continuous operation from –40°C to +85°C. This range covers industrial and extended commercial environments, including inside laptops and mobile phones under worst-case ambient and self-heating conditions. All key parameters - zero-g offset, sensitivity, and noise - are guaranteed across this full span per Table 2 of the datasheet.

Does the MMA7340LR2 require external passive components for basic operation?

Yes - the MMA7340LR2 requires a 0.1 μF ceramic capacitor between VDD and VSS, placed within 2 mm of the device, plus 3.3 nF capacitors on each analog output (XOUT/YOUT/ZOUT) to suppress switched-capacitor clock noise. These are mandatory per Figure 5 and Note 4 in the datasheet; omitting them degrades bandwidth and introduces ripple artifacts.

How does the g-Select pin configure the MMA7340LR2's sensitivity?

The g-Select pin (Pin 10) sets full-scale range: logic low selects ±3g (440 mV/g), logic high selects ±11g (117.5 mV/g). An internal pull-down ensures ±3g default if left unconnected. This allows dynamic range adjustment in firmware without hardware changes - critical for multi-mode devices like smartphones supporting both tilt UI and shock detection.

What is the purpose of the Self Test pin on the MMA7340LR2?

The Self Test pin (Pin 13) initiates an electrostatic self-test that deflects the internal g-cell structure, producing measurable output shifts: ~0.05 g on X/Y axes and ~0.8 g on Z-axis. This verifies end-of-line solder joint integrity and in-field mechanical/electrical functionality - essential for HDD protection systems where failure could cause data loss.

Can the MMA7340LR2 be used with a 1.8 V supply?

No - the MMA7340LR2 has an absolute maximum supply rating of –0.3 V to +3.6 V, but its guaranteed operating range starts at 2.2 V. Below 2.2 V, performance (especially zero-g offset and sensitivity) is not characterized or supported. For 1.8 V systems, consider alternatives like the KXSC7-2050 or ADXL362 with true 1.6–3.5 V operation.