NXP Semiconductors MMA1260D

Overview

MMA1260D from Freescale Semiconductor is a single-axis (Z-axis), ±1.5g micromachined capacitive accelerometer in 16-lead SOIC package, featuring integrated signal conditioning, factory-calibrated 2nd-order Bessel low-pass filter (f_−3dB = 40–60 Hz), and self-test functionality. It delivers linear ratiometric analog output (1110–1290 mV/g) with zero-g offset of 2.2–2.8 V at 5.0 V supply, used for hard drive protection and vibration monitoring.

For engineers reviewing the MMA1260D datasheet, MMA1260D pinout, MMA1260D application, or MMA1260D equivalent, this page provides verified Z-axis sensitivity specs, SOIC-16 terminal mapping, self-test timing (≤25 ms), status fault latching behavior, and drop-in alternatives for low-g industrial motion sensing.

Technical Context

The MMA1260D implements a surface-micromachined polysilicon g-cell with back-to-back capacitive sensing, read out via switched-capacitor CMOS ASIC. Its signal path includes temperature-compensated gain, integrator, and 2-pole Bessel filter - all monolithically integrated with EPROM-trimmed calibration data.

Self-test applies electrostatic force to the movable plate using a dedicated fourth electrode; status pin latches on EPROM parity error and resets only on ST rising edge if no persistent fault exists. Output drives up to 100 pF with <2 Ω impedance and recovers from saturation in ≤2 ms.

Key Specifications

Pinout & Package

16-lead SOIC package (Case 475-01), 10.15–10.45 mm × 7.40–7.60 mm × 3.30–3.55 mm body size, with exposed die attach pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-g analog accelerometer applications.

Compared with ADXL322 and MMA8451Q, the MMA1260D uniquely combines analog simplicity, hardware self-test confirmation, and fault-latched STATUS signaling - making it optimal for safety-critical or field-deployed systems requiring deterministic Z-axis motion validation without software overhead.

Availability

MMA1260D is available at Aetrix Electronics and suitable for hard drive protection, appliance control, and vibration monitoring applications requiring stable component supply across extended temperature ranges (−40°C to +105°C).

Supply support for MMA1260D 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 global semiconductor company specializing in embedded processing, sensors, and analog solutions for automotive, industrial, and consumer markets.

The MMA series was designed specifically for robust, low-g motion sensing in cost-sensitive industrial and consumer systems - emphasizing factory-calibrated analog output, self-test reliability, and SOIC-packaged ease of integration.

FAQ

What is the exact sensitivity axis and full-scale range of the MMA1260D?

The MMA1260D is a single-axis Z-axis accelerometer with a full-scale range of ±1.5g. Its sensitivity is specified as 1110–1290 mV/g (typ. 1200 mV/g) at VDD = 5.0 V and TA = 25°C. The device outputs a ratiometric analog voltage centered at mid-supply (e.g., ~2.5 V at 5 V), increasing for positive Z-axis acceleration and decreasing for negative acceleration. This axis-specific design makes MMA1260D ideal for vertical-motion detection in applications like free-fall sensing.

Does the MMA1260D require external components for basic operation?

Yes - the MMA1260D requires external passive components for reliable operation. A 0.1 µF ceramic capacitor must be placed directly at the VDD pin for power supply decoupling. Additionally, an RC filter (1 kΩ resistor + 0.1 µF capacitor to ground) is mandatory on the VOUT pin to suppress switched-capacitor clock feedthrough noise. These components are explicitly called out in the Freescale datasheet's recommended connection diagram and PCB layout guidelines for the MMA1260D.

How does the self-test function work on the MMA1260D, and what is its response time?

The MMA1260D 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 voltage shift (ΔV_ST = 0.3–0.9 V). The output reaches 90% of final value within ≤25 ms. This verifies both mechanical integrity (g-cell) and electronic functionality (ASIC, output stage). The MMA1260D datasheet confirms this timing and specifies that ST must be held high for ≥10 µs to ensure activation.

What does the STATUS pin indicate, and how is it reset?

The STATUS pin on the MMA1260D is an open-drain output that goes high to indicate either an active self-test condition or an EPROM parity error (odd number of bits). It latches high on parity failure and remains asserted until a rising edge is applied to the ST pin - unless the fault persists. The MMA1260D datasheet explicitly states that STATUS is invalid after power-up until at least one ST rising edge occurs, and that it OR's self-test state with fault latch output.

Is the MMA1260D RoHS compliant and qualified for automotive use?

The MMA1260D is not automotive-qualified; its datasheet specifies an industrial temperature range of −40°C to +105°C and cites applications in appliances, HDDs, and input devices - not AEC-Q100 or automotive safety standards. Regarding RoHS compliance: while Freescale's 2004 documentation predates full RoHS enforcement, the SOIC-16 package and material content align with lead-free conversion practices adopted by Freescale in subsequent years. For formal compliance verification, consult NXP's current MMA1260D product change notices or material declarations.