NXP Semiconductors MMA6270QR2

Overview

MMA6270QR2 from Freescale Semiconductor is a dual-axis capacitive micromachined accelerometer with selectable full-scale ranges (±1.5 g / ±2 g / ±4 g / ±6 g), 800 mV/g sensitivity at 1.5 g, and integrated signal conditioning including a 1-pole switched-capacitor low-pass filter. It operates from 2.2 V to 3.6 V, draws 500 μA in active mode and 3 μA in Sleep Mode, and is housed in a 6 mm × 6 mm × 1.45 mm QFN-16 package for handheld motion-sensing applications such as freefall detection in laptops and tilt compensation in e-compass systems.

For engineers reviewing the MMA6270QR2 datasheet, MMA6270QR2 pinout, MMA6270QR2 application, or MMA6270QR2 equivalent, key selection criteria include g-select logic configuration, ratiometric output behavior, zero-g offset drift over temperature, sleep-mode enable timing, and compatibility with 11 kHz internal sampling frequency to avoid aliasing in microcontroller-based A/D acquisition.

Technical Context

The MMA6270QR2 integrates two surface-micromachined polysilicon g-cells with an ASIC that performs capacitance-to-voltage conversion using switched-capacitor techniques. Its internal EEPROM trims zero-g offset and sensitivity across temperature, eliminating external calibration components.

Signal conditioning includes factory-set low-pass filtering (f_−3dB = 350 Hz typical), ratiometric output scaling (offset and sensitivity track V_DD), and digital g-select control via pins 1 and 2 to reconfigure gain dynamically without interrupting operation.

Key Specifications

Pinout & Package

Package: 16-lead QFN (6 mm × 6 mm × 1.45 mm), case 1622-02, Pb-free terminations, exposed die pad internally connected to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL322BCPZ and KXSC7-2050, the MMA6270QR2 uniquely balances analog simplicity, multi-range flexibility, and sub-5 μA sleep power-making it optimal for cost-sensitive, battery-powered motion UI where minimal MCU intervention and direct ADC interfacing are priorities.

Availability

MMA6270QR2 is available at Aetrix Electronics and suitable for laptop freefall protection, smartphone motion dialing, e-compass tilt compensation, and handheld gaming motion control requiring stable component supply across industrial temperature grades.

Supply support for MMA6270QR2 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 fabless semiconductor company specializing in embedded processing, sensors, and analog solutions for automotive, industrial, and consumer markets.

The MMA6270QR2 belongs to Freescale's micromachined accelerometer product line, designed specifically for low-cost, low-power motion sensing in battery-operated portable electronics with minimal external component requirements.

FAQ

What is the pin configuration difference between MMA6270QR2 and MMA6270QT?

The MMA6270QR2 and MMA6270QT share identical pinout, electrical characteristics, and functional block diagram. The only distinction is packaging: MMA6270QR2 is supplied in tape-and-reel format (QFN-16, case 1622-02), while MMA6270QT is offered in tray packaging. Both operate identically in circuit and require the same PCB footprint and layout guidelines.

How does the g-Select feature affect the MMA6270QR2's output voltage range?

The g-Select feature changes internal gain to adjust full-scale range and sensitivity: at 1.5 g, output spans ~0.85 V to 2.45 V (800 mV/g); at 6 g, same V_DD yields ~1.05 V to 2.25 V (200 mV/g). Zero-g remains at V_DD/2 (1.65 V @ 3.3 V), preserving ratiometric behavior across all modes. This allows dynamic range adaptation without hardware changes.

Can MMA6270QR2 be used with a 2.5 V supply, and how does that impact performance?

Yes, MMA6270QR2 operates down to 2.2 V. At 2.5 V, full-scale output range compresses proportionally (e.g., ~0.85 V to 1.65 V at 1.5 g), and ratiometric zero-g offset shifts to 1.25 V. Sensitivity drops to ~606 mV/g, and ratiometric error increases-especially zero-g offset error (>20% at 2.2 V). For best accuracy, use ≥2.7 V; validate system-level error at target V_DD.

What is the recommended RC filter for MMA6270QR2 outputs, and why is it needed?

A 1.0 kΩ resistor and 0.1 μF capacitor (RC = 100 μs, f_c ≈ 1.6 kHz) is recommended on each output (XOUT/YOUT) to suppress clock feedthrough from the internal 11 kHz switched-capacitor filter. Without it, high-frequency switching noise couples into downstream ADCs, increasing effective noise floor and distorting low-amplitude motion signals-particularly critical in freefall detection and tilt sensing.

Does MMA6270QR2 support simultaneous X and Y axis sampling, and what is the timing relationship?

Yes, MMA6270QR2 samples both axes simultaneously using a shared internal oscillator and signal chain. XOUT and YOUT are updated synchronously every 91 μs (11 kHz internal sampling rate), with matched propagation delay and phase. This ensures coherent vector measurement for tilt and motion direction-critical for e-compass compensation and gaming gesture recognition where axis correlation matters.