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2 Freescale Semiconductor, Inc. detrimental to its performance. Table 1. Maximum Ratings

  1. Dropped onto concrete surface from any axis.

Table 2. Operating Characteristics

  1. For a loaded output the measurements are observed after an RC filter consisting of a 1 k  resistor and a 0.01 F capacitor to ground.
  2. These limits define the range of operation for which the part will meet specification.
  3. Within the supply range of 4.75 and 5.25 V, the device operates as a fully calibrated linear accelerometer. Beyond these supply limits the

device may operate as a linear device but is not guaranteed to be in calibration.

  1. The device can measure both + and – acceleration. With no input acceleration the output is at midsupply. For positive acceleration the output

will increase above VDD/2 and for negative acceleration the output will decrease below VDD/2.

  1. The device is calibrated at 35g.

0.47 VDD

0.50 VDD

0.53 VDD

  1. At clock frequency  70 kHz.
  2. VOFF calculated with typical sensitivity.
  3. The digital input pin has an inte rnal pull-down current source to prevent inadvertent self test initiation due to external board level leakages.
  4. Time for the output to reach 90% of its final value after a self-test is initiated.
  5. The Status pin output is not valid following power-up until at least one rising edge has been applied to the self-test pin. The Status pin is

high whenever the self-test input is high, as a means to check the connectivity of the self-test and Status pins in the application.

  1. The Status pin output latches high if a Low Voltage Detection or Clock Frequency failure occurs, or the EPROM parity changes to odd. The

Status pin can be reset low if the self-test pin is pulsed with a high input for at least 100 s, unless a fault condition continues to exist.

  1. Time for amplifiers to recover after an acceleration signal causes them to saturate.
  2. Preserves phase margin (60°) to guarantee output amplifier stability.
  3. A measure of the device's ability to reject an accele ration applied 90° from the true axis of sensitivity.

Figure 5. SOIC Accelerometer with Recommended Figure 6. Recommended PCB Layout for Interfacing

  1. Use a 0.1 F capacitor on VDD to decouple the power
  2. Physical coupling distance of the accelerometer to the

microcontroller should be minimal.

  1. Place a ground plane beneath the accelerometer to

all of the open ended terminals shown in Figure 6.

  1. Use an RC filter of 1 k and 0.01 F on the output of

switched capacitor filter circuit).

  1. PCB layout of power and ground should not couple
  2. Accelerometer and microcontroller should not be a
  3. A/D sampling rate and any external power supply

sampling frequency. This will prevent aliasing errors. Table 3. Pin Descriptions 1 thru 3 — Leave unconnected.

4 ST Logic input pin used to initiate

5 VOUT Output voltage of the

6 STATUS Logic output pin to indicate fault. 7 VSS The power supply ground. 8 VDD The power supply input.

8 VDD

6 Freescale Semiconductor, Inc. Direction of Earth’s gravity field(1) 1. When positioned as shown, the Earth’s gravity will result in a positive 1g output. 87654321 9 1 01 11 21 31 41 5 1 6 16-Pin SOIC Package N/C pins are recommended to be left FLOATING Front View Side View Top View Acceleration of the package in the X direction (center plate moves in the X direction) will result in an increase in the output. Dynamic Acceleration Sensing Direction Static Acceleration Sensing Direction Activation of Self Test moves the center plate in the X direction, resulting in an increase in the output.

shorting between solder pads. Figure 7. Footprint SOIC-16 (Case 475-01)

8 Freescale Semiconductor, Inc. MMA2300KEG PACKAGE DIMENSIONS PAGE 1 OF 2 CASE 475-01 ISSUE C

16 LEAD SOIC

Freescale Semiconductor, Inc. 9 MMA2300KEG PACKAGE DIMENSIONS PAGE 2 OF 2 CASE 475-01 ISSUE C

Table 4. Revision History

Rev. 1 How to Reach Us: Home Page: freescale.com Web Support: freescale.com/support Information in this document is provided solely to enable system and software implementers to use Freescale products. There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits based on the information in this document. Freescale reserves the right to make changes without further notice to any products herein. Freescale makes no warranty, representation, or guarantee regarding the suitability of its products for any particular purpose, nor does Freescale assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters that may be provided in Freescale data sheets and/or specifications can and do vary in different applications, and actual performance may vary over time. All operating parameters, including “typicals,” must be validated for each customer application by customer’s technical experts. Freescale does not convey any license under its patent rights nor the rights of others. Freescale sells products pursuant to standard terms and conditions of sale, which can be found at the following address: freescale.com/salestermsandconditions. Freescale, the Freescale logo, Energy Efficient Solutions logo, are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © 2012 Freescale Semiconductor, Inc.