NXP Semiconductors MMA1211KEG

Overview

MMA1211KEG from Freescale Semiconductor is a surface-mount, micromachined silicon capacitive accelerometer with ±150g measurement range, ratiometric linear output, and integrated 4th-order Bessel low-pass filter (f_–3dB = 360–440 Hz). It features factory-calibrated zero-g offset and sensitivity, self-test capability, and AEC-Q100 Grade 2 qualification (–40°C to +105°C) for automotive vibration and impact monitoring.

For engineers reviewing the MMA1211KEG datasheet, MMA1211KEG pinout, MMA1211KEG application, or MMA1211KEG equivalent, key selection criteria include its SOIC-16 package, VDD-dependent output scaling (0.46–0.54 VDD at zero-g), 12.66–14.00 mV/g/V sensitivity, status-fault latching behavior, and ESD-sensitive handling requirements.

Technical Context

The MMA1211KEG integrates a hermetically sealed polysilicon g-cell transducer with a CMOS ASIC containing switched-capacitor signal conditioning, temperature compensation, and EPROM-trimmed calibration. Its 4-pole Bessel filter preserves pulse shape integrity without external components, and self-test applies electrostatic force to verify mechanical and electrical functionality.

Operation requires VDD = 4.75–5.25 V for full calibration; outside this range, linearity is maintained but calibration is not guaranteed. The STATUS pin latches high on Low Voltage Detect (VLVD = 2.7–4.0 V), clock monitor failure (f_min = 50–260 kHz), or EPROM parity error, and resets only upon ST pin pulse if fault persists.

Key Specifications

Pinout & Package

Package: 16-lead SOIC (Case 475-01), Pb-free (KEG suffix), surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMA1211EG, the MMA1211KEG offers identical performance with enhanced supply-chain resilience; versus ADXL322, it delivers automotive-qualified fault reporting, calibrated self-test, and tighter sensitivity tolerance-critical for safety-critical impact detection.

Availability

MMA1211KEG is available at Aetrix Electronics and suitable for automotive crash sensing, industrial vibration monitoring, transportation impact logging, and structural health monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MMA1211KEG 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, sensors, and analog ICs for automotive, industrial, and consumer applications.

The MMA series was developed specifically for high-reliability motion sensing in automotive safety systems and industrial condition monitoring, emphasizing factory calibration, diagnostic integrity, and AEC-Q100 compliance.

FAQ

What is the operating voltage range for the MMA1211KEG?

The MMA1211KEG operates within a supply voltage range of 4.75 V to 5.25 V for fully calibrated performance. While the device may function outside this window (–0.3 V to +7.0 V absolute maximum), calibration accuracy is only guaranteed within the 4.75–5.25 V band. The MMA1211KEG's ratiometric output scales linearly with VDD, making it tolerant to minor supply variations during normal operation.

How does the self-test feature of the MMA1211KEG work?

The MMA1211KEG self-test applies an electrostatic force to the micromachined g-cell by driving the ST pin high, causing a calibrated mechanical deflection equivalent to 55–95 g. This produces a measurable shift in VOUT, verifying both transducer integrity and signal chain functionality. The MMA1211KEG STATUS pin also toggles during self-test, enabling hardware-level connectivity checks between ST and STATUS lines.

What does the "K" suffix in MMA1211KEG indicate?

The "K" suffix in MMA1211KEG denotes manufacture using an alternate silicon sourcing process, providing supply chain diversification without altering electrical specifications, package, or pinout. All performance parameters-including sensitivity, bandwidth, and AEC-Q100 qualification-remain identical to the base MMA1211EG variant. The MMA1211KEG maintains full form-fit-function compatibility with non-K versions.

Is the MMA1211KEG RoHS-compliant and lead-free?

Yes, the MMA1211KEG is RoHS-compliant and Pb-free, as confirmed by its "KEG" suffix designation. Its electrical characteristics and functionality match those of non-RoHS versions, with no performance trade-offs. The MMA1211KEG meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for SOIC-16 packaging and supports standard lead-free reflow profiles.

What fault conditions cause the STATUS pin on the MMA1211KEG to assert?

The STATUS pin on the MMA1211KEG latches high when any of three fault conditions occur: supply voltage falling below the Low Voltage Detect threshold (2.7–4.0 V), internal clock frequency dropping below 50–260 kHz, or EPROM parity becoming odd. The MMA1211KEG STATUS pin remains asserted until a rising edge is applied to ST-unless the underlying fault persists, in which case it immediately reasserts.