NXP Semiconductors MMA7660FCR1

Overview

MMA7660FCR1 from NXP (formerly Freescale) is a ±1.5 g, 3-axis capacitive MEMS accelerometer with I²C digital output, designed for orientation detection, tap/shake gesture recognition, and motion-triggered interrupt signaling in space-constrained portable electronics. It delivers 6-bit resolution per axis at user-configurable ODRs from 1 to 120 Hz, operates from 2.4–3.6 V analog and 1.71–3.6 V digital supplies, and consumes only 47 µA in active mode at 1 Hz.

For engineers reviewing the MMA7660FCR1 datasheet, MMA7660FCR1 pinout, MMA7660FCR1 application, or MMA7660FCR1 equivalent, key selection considerations include its DFN-10 package footprint, interrupt-driven tilt/gesture response latency, low-power auto-wake/sleep behavior, and register-level configuration of debounce, sensitivity thresholds, and orientation logic - all critical for battery-powered mobile and embedded motion-sensing designs.

Technical Context

The MMA7660FCR1 integrates a polysilicon MEMS sensing element with an ASIC featuring switched-capacitor C-to-V conversion, analog low-pass filtering, offset/gain compensation, and a 150 kHz internal oscillator. Its signal chain digitizes acceleration on X/Y/Z axes into 6-bit values stored in dedicated output registers (XOUT/YOUT/ZOUT), then feeds them into configurable digital logic blocks for tilt classification, tap detection, and shake analysis.

Orientation determination uses real-time comparison of normalized axis magnitudes against fixed thresholds (e.g., |Z| < 0.8g and |X| > |Y| for Up/Down), updated into the TILT register with programmable debounce (FILT[2:0]). Tap detection triggers on transient acceleration exceeding PDET threshold for PD-duration, while shake interrupts activate when any axis exceeds ±1.3 g - all generating INT pin assertions without host polling.

Key Specifications

Pinout & Package

Housed in a 3 mm × 3 mm × 0.9 mm, 10-pin DFN package (Case 2002-03) with wettable flanks for automated optical inspection. Pin 1 is top-left corner (marked by dot); bottom-side thermal pad is electrically isolated and recommended for PCB thermal relief.

Key Features

Applications

Equivalent & Alternatives

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

Compared with KXSC7-1051 and BMA220, the MMA7660FCR1 uniquely integrates orientation state machine, tap/shake detectors, and auto-wake/sleep control in hardware - reducing MCU firmware complexity and interrupt latency for consumer gesture interfaces, albeit at lower resolution and narrower range.

Availability

MMA7660FCR1 is available at Aetrix Electronics and suitable for mobile phone orientation detection, laptop anti-theft systems, gaming motion control, and digital camera image stabilization requiring stable component supply and long-term production continuity.

Supply support for MMA7660FCR1 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in sensor signal conditioning and low-power mixed-signal design.

The MMA7660FCR1 belongs to NXP's legacy Freescale motion sensor portfolio, engineered specifically for energy-efficient orientation and gesture recognition in battery-powered portable electronics - emphasizing integration, interrupt-driven operation, and minimal host processing overhead.

FAQ

What is the operating temperature range for the MMA7660FCR1?

The MMA7660FCR1 is specified for continuous operation from –40°C to +85°C. This range covers industrial and consumer environments including smartphone internals, automotive infotainment enclosures, and outdoor portable devices. All key parameters - including offset drift (±1.5 mg/°C max), sensitivity variation (±0.01%/°C), and I²C timing - are guaranteed across this full range per the Rev 8 datasheet.

Does the MMA7660FCR1 support both 1.8 V and 3.3 V I²C bus operation?

Yes, the MMA7660FCR1 supports I²C communication with DVDD supplied from 1.71 V to 3.6 V, making it compatible with both 1.8 V and 3.3 V logic families. The SDA and SCL pins are open-drain with VIH = 0.7 × DVDD and VIL = 0.35 × DVDD, ensuring robust noise margins. External pull-ups must match the DVDD voltage (Pin 9), not AVDD.

How does the MMA7660FCR1 handle orientation debounce, and can it be adjusted?

The MMA7660FCR1 implements orientation debounce via the FILT[2:0] bits in the SR register (0x08). Setting FILT = 000 updates the TILT register (0x03) immediately on every sample; values 001–111 require 1–7 consecutive matching orientation states before update. This prevents flickering during slow transitions and is fully configurable without firmware intervention - a hardware feature unique to the MMA7660FCR1 among entry-level accelerometers.

What is the minimum detectable tap event duration for the MMA7660FCR1?

The MMA7660FCR1's tap detection duration is set by the PD register (0x0A), which configures the number of consecutive samples (1–128) that must exceed the PDET threshold (0x09) to trigger PDINT. At maximum ODR (120 Hz), the shortest detectable pulse is ~8.3 ms; at 1 Hz, it is 1 second. This allows tuning from crisp button-like taps to sustained motion events - all handled autonomously by the MMA7660FCR1's embedded logic.

Is there a self-test function available on the MMA7660FCR1?

No, the MMA7660FCR1 does not include an electrostatic self-test function. The datasheet explicitly states "MMA7660FC does not include an accelerometer self test function." However, it offers Test Mode (via MODE register), which disables MEMS sensing and allows direct 6-bit values to be written to XOUT/YOUT/ZOUT registers - enabling full validation of interrupt generation, orientation logic, and I²C read/write paths without physical stimulus.