User Manual

ManualsBrandsDimension Engineering ManualsAccelerometers, Gyros, GPS, & CompassesBuffered 6g Accelerometer

DE-ACCM6G Buffered ±6 Accelerometer

Features

Dual axis ±6g sense range

222mV/g sensitivity

500Hz bandwidth

Operating voltage 4 to 15V

Onboard 3.3V voltage regulator

Reverse voltage protection

Output short protection

Standard DIP-14 form factor

Integrated power supply decoupling

Draws under 2mA

Shiny gold pins to distract the enemy!

Applications

Motion, tilt and slope measurement

Shock sensing

Vehicle acceleration logging

General Description

The DE-ACCM6G is an off the shelf 2 axis 6g

accelerometer solution with analog outputs. It

features integrated op amp buffers for direct

connection to a microcontroller’s analog

inputs, or for driving heavier loads.

Additional circuitry ensures that the product

won’t be damaged by reversed power

connections, or voltages above the

recommended ratings.

The DE-ACCM6G is designed to fit the DIP-14

form factor, making it suitable for

breadboarding, perfboarding, and insertion

into standard chip sockets.

It is based on the ST MicroElectronics

LIS244ALH for superior sensitivity and lower

cost.

Summary of content (4 pages)

PAGE 1
DE-ACCM6G Buffered ±6 Accelerometer General Description The DE-ACCM6G is an off the shelf 2 axis 6g accelerometer solution with analog outputs. It features integrated op amp buffers for direct connection to a microcontroller’s analog inputs, or for driving heavier loads. Additional circuitry ensures that the product won’t be damaged by reversed power connections, or voltages above the recommended ratings.
PAGE 2
Measuring acceleration and tilt The voltage outputs on the DE-ACCM6G correspond to acceleration being experienced in the X and Y directions. The output is ratiometric, so the output sensitivity (in mV/g) will depend on the supply voltage. Sensitivity is typically 222mV/g. Zero acceleration (0g) will result in an output of Vcc/2 regardless of the voltage supplied to the unit. Due to manufacturing variances when ST Microelectronics makes their accelerometer chips, these values aren’t always set in stone.
PAGE 3
Voltage to acceleration example: ”The X output reads 2.96V. What acceleration does this correspond to?” The 0g point is approximately Vcc / 2 = 3.33 / 2 = 1.66V 2.96V - 1.66V = +1.20V with respect to the 0g point Sensitivity is 222mV/g, 1.2 / 0.312 = 5.41g Therefore the acceleration in the X direction is 5.41g Acceleration to voltage example: ”What voltage will correspond to an acceleration of -0.5g?” The 0g point is approximately 1.66V Sensitivity is 222mV/g, -0.5 * 0.222 = -0.
PAGE 4
Performance features Output buffers A bare accelerometer chip has an output impedance of 32kΩ, which is unsuitable for obtaining reliable measurements when connected to an analog to digital converter. On the DE-ACCM6G, a dual rail to rail operational amplifier buffers the outputs from the LIS244ALH, greatly reducing output impedance. Buffer loading characteristics For the purposes of this section, “max load” is defined as the resistive load that will cause a 2mV drop in the output voltage at 0g.