MMA6700EG and MMA6701EG 2-Axes Accelerometer for Automotive Electronic Stability Control (ESC) System - Freescale

Freescale has announced the availability of MMA6700EG and MMA6701EG 2-Axes
Low-Gravity (Low-G) Inertial Sensor (Accelerometer), targeted primarily at
automotive Electronic Stability Control (ESC) systems, to help car drivers
maintain control of their vehicles. Based on Freescale’s HARMEMS technology, MMA6700EG/MMA6701EG accelerometers offer a wide dynamic range with high
sensing resolution, enabling automotive Electronic Stability Control
designers to filter out extraneous signals that
could potentially interfere with the acceleration measurement. The integrated DSP
(digital signal processor)
in MMA6700EG/MMA6701EG accelerometer improves signal integrity and provides higher accuracy for ESC applications.

Freescale MMA6700EG and MMA6701EG 2-Axes Inertial Sensor (Accelerometer)

About Freescale’s HARMEMS technology
HARMEMS technology provides
over-damped mechanical response and exceptional signal-to-noise ratio to address
customer requirements. Since the ESC system is installed either in the vehicle
cabin or under the hood, over-damped HARMEMS technology enables a high degree of
immunity to high-frequency, high-amplitude parasitic vibrations. For ESC
applications, the higher signal-to-noise ratio combined with Freescale’s DSP-based
signal chain is designed to provide both a wide range and high sensitivity with
less than one least significant bit (LSB) noise.

MMA6700EG and MMA6701EG Accelerometer - Block Diagram

Key features of MMA6700EG and MMA6701EG Accelerometer:

• XY-axis of sensitivity in one device
• +/- 3.5 or +/- 5 g full-scale range per axis
• 10- or 11-bit digital data output
• MMA6700EG: +/-3.5 g (11-bit data sensitivity = 3.43 mg/digit typical at 25
  degrees C)
• MMA6701EG: +/-5 g (11-bit data sensitivity = 4.91 mg/digit typical at 25
  degrees C)
• Selection of integrated signal conditioning low-pass filters
• SPI-compatible serial interface
• Bidirectional internal self-test
• Support for signed or unsigned output data
• Capture/hold input for system-wide synchronization support
• Ratiometric analog voltage output
• Five customer-assigned, one-time-programmable (OTP) bytes
• On-chip temperature sensor and voltage regulator
• Minimal external component requirements, 4 capacitors
• 3.3 V or 5 V single supply operation
• Robust 20-pin SOIC wide-body RoHS-compliant package
• Wide operating temperature range from -40 degrees C to +125 degrees C

Typical Applications of MMA6700EG and MMA6701EG Accelerometer:

• With a +3.5 g or +5 g full scale range, the newly designed, high accuracy
  sensor enables electronic stability control (ESC) designers to accommodate
  higher original signal noise level without sacrificing resolution.
• Tilt Measurement

Samples of the MMA6700EG and MMA6701EG 2-Axes Accelerometer are
available now to automotive customers. The suggested resale price in 10K-piece
quantities starts at $7.67.

Resources:

• MMA6700: Automotive Electronic Stability Control XY Accelerometer
  (http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MMA6700&fsrch=1)
• Technical Data: MMA6700EG: High Accuracy Low g Inertial Sensor; MEMS
  Sensing, State Machine ASIC (http://www.freescale.com/files/sensors/doc/data_sheet/MMA6700EG.pdf?pspll=1)