NXP Semiconductors MMA1220KEG

Overview

MMA1220KEG from Freescale Semiconductor is a z-axis micromachined capacitive accelerometer with ±8g full-scale range, 250 Hz bandwidth, and ratiometric linear output referenced to VDD. It integrates signal conditioning, a 4th-order Bessel filter, temperature compensation, and self-test capability in a hermetically sealed SOIC-16 package. Used in hard drive protection and appliance control where reliable low-g motion sensing is required.

For engineers reviewing the MMA1220KEG datasheet, MMA1220KEG pinout, MMA1220KEG application, or MMA1220KEG equivalent, this page delivers verified technical context, pin-level design meaning, real-world use cases, and validated alternative options - all grounded in Freescale's Rev 0 (11/2009) technical data.

Technical Context

The MMA1220KEG implements a surface-micromachined polysilicon g-cell with dual back-to-back capacitors, measured via switched-capacitor ASIC circuitry. Its on-chip 4-pole Bessel filter preserves pulse shape integrity without external components, and factory-trimmed zero-g offset and sensitivity eliminate calibration requirements.

Self-test is activated by a logic-high ST input, electrostatically deflecting the center plate to verify mechanical and electrical functionality. Fault detection includes low-voltage detect, clock monitor, and EPROM parity check - latched to STATUS pin until reset by ST pulse.

Key Specifications

Pinout & Package

Package: 16-lead SOIC (Case 475-01), Pb-free, RoHS-compliant, surface-mountable with standard reflow profile. Hermetically sealed at wafer level for long-term reliability in harsh environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL322Z and MMA8452Q, the MMA1220KEG provides analog ratiometric output with integrated fault reporting and AEC-Q100 Grade 2 qualification - making it uniquely suitable for legacy industrial and automotive systems where analog integration, self-test validation, and extended temperature reliability are mandatory.

Availability

MMA1220KEG is available at Aetrix Electronics and suitable for hard drive protection, appliance control, computer peripheral motion sensing, and sport diagnostic systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MMA1220KEG 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 leading designer of embedded processors and sensors, specializing in automotive, industrial, and consumer ICs with rigorous qualification standards.

The MMA series was developed specifically for robust, calibrated analog acceleration sensing in safety- and reliability-critical applications - emphasizing hermetic sealing, self-test, and AEC-Q100 compliance from inception.

FAQ

What is the primary sensing axis and full-scale range of the MMA1220KEG?

The MMA1220KEG is a single-axis z-axis accelerometer with a fixed full-scale range of ±8g. Its mechanical structure is optimized for acceleration perpendicular to the PCB surface, and its output increases above VDD/2 for positive z-direction acceleration (e.g., upward motion or gravity-aligned orientation). This specification is factory-set and requires no external configuration.

Does the MMA1220KEG require external components for basic operation?

Yes - the MMA1220KEG requires a 0.1 μF ceramic capacitor between VDD and VSS for power supply decoupling, and an RC filter (1 kΩ + 0.01 μF to ground) on VOUT to suppress 70 kHz clock noise from its internal switched-capacitor filter. No external resistors or capacitors are needed for gain, offset, or filter cutoff setting - all are factory trimmed.

How does the self-test function work on the MMA1220KEG?

The MMA1220KEG self-test applies a calibrated electrostatic force to the movable g-cell plate via the ST pin. When ST is driven high, the resulting deflection produces a known output shift (ΔVST ≈ 0.2 VDD), verifying both mechanical integrity and signal chain functionality. The STATUS pin reflects self-test activation and latches faults independently.

Is the MMA1220KEG compatible with modern RoHS and lead-free assembly processes?

Yes - the MMA1220KEG carries the "KEG" suffix indicating Pb-free construction and RoHS compliance per Freescale's Rev 0 (11/2009) documentation. It uses standard SOIC-16 reflow profiles and maintains identical electrical performance to non-Pb-free variants, with no derating required.

What fault conditions does the STATUS pin report on the MMA1220KEG?

The STATUS pin on the MMA1220KEG reports three independent fault conditions: low supply voltage (below LVD threshold), internal clock frequency deviation (clock monitor failure), and EPROM parity error (odd bit count). It latches high until reset by a valid ST pulse - enabling persistent fault indication without continuous polling.