NXP Semiconductors MMA6271QR2

Overview

MMA6271QR2 from Freescale Semiconductor is a two-axis capacitive micromachined accelerometer with selectable full-scale ranges (±2.5g/±3.3g/±6.7g/±10g), 500 μA typical supply current, and integrated signal conditioning with ratiometric analog outputs. It features factory-trimmed zero-g offset and bandwidth, sleep mode (3 μA), and operates from 2.2 V to 3.6 V. Used in motion-triggered functions for handheld consumer electronics.

For engineers reviewing the MMA6271QR2 datasheet, MMA6271QR2 pinout, MMA6271QR2 application, or MMA6271QR2 equivalent, key selection criteria include g-range configurability via dual logic inputs, QFN-16 package compatibility, low-power sleep activation timing (0.5 ms enable), and ratiometric output scaling with supply voltage.

Technical Context

The MMA6271QR2 integrates dual surface-micromachined g-cells with an ASIC performing switched-capacitor C-to-V conversion, temperature-compensated gain control, and a single-pole switched-capacitor low-pass filter (f_−3dB = 350 Hz typ). Sensitivity is digitally selected via g-Select1/g-Select2 pins, altering internal gain without external components.

Its ratiometric architecture ensures output offset (1.65 V at 0g) and sensitivity scale linearly with V_DD, enabling direct interface to microcontroller ADCs without supply-voltage error compensation. Sleep Mode disables output drivers and reduces current to 3 μA while preserving configuration state.

Key Specifications

Pinout & Package

Package: 16-lead QFN (Case No. 1622-02), 6 mm × 6 mm × 1.45 mm, exposed thermal pad internally connected to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL322ARZ and KXSC7-2050, the MMA6271QR2 uniquely combines analog ratiometric outputs, four selectable g-ranges, and sub-μA sleep current in a single QFN package-enabling flexible, low-cost motion sensing without digital interface overhead or external calibration.

Availability

MMA6271QR2 is available at Aetrix Electronics and suitable for laptop freefall protection, smartphone motion dialing, PDA text scrolling, and handheld gaming tilt control requiring stable component supply and long-term industrial availability.

Supply support for MMA6271QR2 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) designed high-performance mixed-signal sensors and microcontrollers for automotive, industrial, and consumer applications.

The MMA6271QR2 belongs to Freescale's surface-micromachined analog accelerometer product line, engineered specifically for cost-sensitive, battery-powered motion sensing in portable electronics.

FAQ

What is the pin-compatible replacement for MMA6271QR2?

The MMA6271QR2 has no documented pin-compatible replacement. Its QFN-16 layout with g-Select1/g-Select2 on pins 1–2, Sleep Mode on pin 12, and XOUT/YOUT on pins 15–14 is unique within Freescale's accelerometer portfolio. Alternative parts like ADXL322ARZ use different pinouts and lack g-select functionality, requiring PCB redesign.

Does MMA6271QR2 require external passive components for basic operation?

No. The MMA6271QR2 requires only a 0.1 µF decoupling capacitor on VDD and optional 1 kΩ + 0.1 µF RC filters on XOUT/YOUT to suppress switched-capacitor clock noise. All signal conditioning, filtering, temperature compensation, and g-range selection are fully integrated-no external resistors, capacitors, or trim pots are needed.

How does the ratiometric output of MMA6271QR2 benefit system-level accuracy?

The MMA6271QR2's ratiometric output means both zero-g offset (1.65 V at 0g) and sensitivity (e.g., 444 mV/g in 2.5g mode) scale linearly with VDD. When interfaced with an MCU ADC using the same VDD as its reference voltage, supply fluctuations cancel out-eliminating a major source of measurement error without software compensation.

What is the maximum shock survivability rating for MMA6271QR2?

The MMA6271QR2 is rated for ±2000 g mechanical shock across all axes, as specified in Table 1 of the datasheet. This rating reflects short-duration transient survivability-not continuous operation-and supports robustness in handheld drop scenarios such as 1.8 m concrete drop tests per Freescale's qualification standards.

Can MMA6271QR2 operate below 0°C, and what design precautions apply?

Yes, the MMA6271QR2 operates from −40°C to +105°C. However, below 0°C, VDD must reach 2.2 V within 0.1 ms at the device pin (measured dV/dt) to ensure reliable power-up. Slow-rising VDD due to excessive PCB trace inductance or large decoupling capacitance (>3.3 µF) may prevent initialization at cold temperatures.