NXP Semiconductors MMA1220EGR2

Overview

MMA1220EGR2 from Freescale Semiconductor is a silicon capacitive, micromachined z-axis accelerometer with ±8g full-scale range, factory-calibrated 4th-order Bessel low-pass filter (f_−3dB = 250 Hz typical), and integrated signal conditioning. It delivers ratiometric linear output (0.50 VDD mV/g/V) and supports self-test verification for mechanical and electrical integrity in harsh environments.

For engineers reviewing the MMA1220EGR2 datasheet, MMA1220EGR2 pinout, MMA1220EGR2 application, or MMA1220EGR2 equivalent, key selection criteria include its SOIC-16 Pb-free tape-and-reel packaging, −40°C to +125°C operating temperature, 5.0 mA supply current, and status-fault latching capability for automotive and industrial safety-critical systems.

Technical Context

The MMA1220EGR2 implements a surface-micromachined polysilicon g-cell with dual back-to-back capacitors, read via switched-capacitor ASIC circuitry. Its on-chip 4-pole Bessel filter preserves pulse shape integrity without external components, and ratiometric output scales linearly with VDD (4.75–5.25 V).

Self-test activation applies electrostatic force to deflect the center plate, generating a calibrated ∆V_ST ≥ 0.2 VDD output shift. Fault detection includes low-voltage detect (LVD), clock monitor (≈70 kHz oscillator), and EPROM parity check, all latched to the STATUS pin until reset by ST pulse.

Key Specifications

Pinout & Package

Package: 16-lead SOIC (Case 475-01), Pb-free, tape-and-reel. Dimensions per Freescale Issue C drawing: 9.65 mm × 5.97 mm × 1.75 mm body, 1.27 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL322ARZ and MMA8452Q, the MMA1220EGR2 uniquely combines factory-trimmed analog output, hardware-latched fault signaling, and calibrated self-test in a single SOIC-16 package - making it optimal for legacy 5 V systems requiring deterministic diagnostics without software overhead.

Availability

MMA1220EGR2 is available at Aetrix Electronics and suitable for computer hard drive protection, appliance control, vibration monitoring, and virtual reality input devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MMA1220EGR2 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 MMA series was designed specifically for robust, calibrated analog acceleration sensing in safety-critical and high-reliability applications - emphasizing wafer-level hermetic sealing, self-test, and fault-detection integration.

FAQ

What is the full-scale acceleration range of the MMA1220EGR2?

The MMA1220EGR2 has a full-scale range of ±8g, meaning it can accurately measure accelerations from −8g to +8g along its sensitive z-axis. This range is factory-set and does not require external calibration components. The device maintains linearity and specified performance across this range at temperatures from −40°C to +125°C, making it suitable for drop detection and high-shock industrial monitoring. The MMA1220EGR2 achieves this with a micromachined polysilicon g-cell and integrated CMOS signal conditioning.

Does the MMA1220EGR2 support self-test, and how is it activated?

Yes, the MMA1220EGR2 includes a calibrated self-test feature activated by applying a logic-high signal to the ST pin (Pin 4) for at least 100 µs. This generates an electrostatic force that deflects the internal g-cell plate, producing a guaranteed output shift of ≥0.2 VDD at VOUT. The STATUS pin reflects self-test activity and latches fault conditions. This function verifies both mechanical integrity and electronic signal chain functionality without external equipment - a key requirement for automotive airbag and hard-drive protection systems using the MMA1220EGR2.

What is the purpose of the STATUS pin on the MMA1220EGR2?

The STATUS pin (Pin 6) on the MMA1220EGR2 is an open-drain logic output that indicates fault conditions or self-test activity. It latches high upon occurrence of low-voltage detect (LVD), clock oscillator failure, or EPROM parity error, and remains asserted until cleared by a pulse on the ST pin - unless the underlying fault persists. During self-test, STATUS goes high concurrently with ST activation. This hardware-level diagnostic capability enables real-time system health monitoring without MCU polling, enhancing reliability in safety-critical applications where the MMA1220EGR2 is deployed.

Is the MMA1220EGR2 RoHS-compliant and Pb-free?

Yes, the MMA1220EGR2 is RoHS-compliant and Pb-free, as indicated by the "EG" suffix in its part number. Freescale confirmed that Pb-free versions maintain identical functionality and electrical specifications versus their non-Pb-free counterparts (e.g., MMA1220D). The device uses standard SOIC-16 packaging (Case 475-01) with matte tin lead finish, qualified for reflow soldering per J-STD-020. No performance trade-offs or derating apply - the MMA1220EGR2 meets all published specs including ±8g range, 250 Hz bandwidth, and −40°C to +125°C operation in its Pb-free form.

What external components are required for stable operation of the MMA1220EGR2?

The MMA1220EGR2 requires two mandatory external components: a 0.1 µF ceramic capacitor between VDD (Pin 8) and VSS (Pin 7) for power supply decoupling, and an RC filter (1 kΩ resistor + 0.01 µF capacitor to ground) on VOUT (Pin 5) to suppress 70 kHz clock noise from the internal switched-capacitor filter. All N/C pins (1–3, 9–16) must remain unconnected. Redundant VSS pins (1–3) should be tied to the same ground plane as Pin 7. These requirements are validated in Freescale's recommended PCB layout (Figure 6) and are essential for achieving specified noise (2.0 mV_rms) and self-test accuracy in the MMA1220EGR2.