MMA2260 FREESCALE | Alldatasheet

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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 observ ed after an RC filter consisting of a 1 kΩ resistor and a 0.1 µF capacitor to ground.
  2. These limits define the range of operation fo r which the part will meet specification.
  3. Within the supply range of 4.75 and 5.25 volts, the device opera tes 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 i nput 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. Sensitivity limits apply to 0 Hz acceleration.
  2. At clock frequency ≅ 34 kHz.
  3. The digital input pin has an internal 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.

0.7 VDD

  1. 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.

  1. The Status pin output latches high if the EPROM parity changes to odd. The Status pin can be reset by a rising edge on self-test, 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 acceleration applied 90° from the true axis of sensitivity.

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integrated-circuit accelerometer. wafer level using a bulk micromachined “cap'' wafer. is a measure of acceleration. between the beams, and N is the number of beams. ratiometric and proportional to acceleration. electronic sections of the accelerometer are functioning. • Parity of the EPROM bits becomes odd in number. Figure 3. Transducer Figure 4. Equivalent

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

  1. Use a 0.1 µF 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 kΩ and 0.01 µF 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 Description

4 VOUT Output voltage of the

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

8 ST Logic input pin used to initiate

6 VDD

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  1. When positioned as shown, the Earth's gravity will result in a positive 1g output Direction of Earth's gravity field.(1) STATIC ACCELERATION +1g -1g 0g 0g VOUT = 2.50V VOUT = 2.50V VOUT = 3.7V VOUT = 1.3V 16-Pin SOIC Package +X -X Top View DYNAMIC ACCELERATION

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How to Reach Us: Home Page: www.freescale.com E-mail: support@freescale.com USA/Europe or Locations Not Listed: Freescale Semiconductor Technical Information Center, CH370 1300 N. Alma School Road Chandler, Arizona 85224 +1-800-521-6274 or +1-480-768-2130 support@freescale.com Europe, Middle East, and Africa: Freescale Halbleiter Deutschland GmbH Technical Information Center Schatzbogen 7

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Tai Po, N.T., Hong Kong +800 2666 8080 support.asia@freescale.com For Literature Requests Only: Freescale Semiconductor Literature Distribution Center P.O. Box 5405 Denver, Colorado 80217 1-800-441-2447 or 303-675-2140 Fax: 303-675-2150 LDCForFreescaleSemiconductor@hibbertgroup.com MMA2260D Rev. 3 RoHS-compliant and/or Pb-free versions of Freescale products have the functionality and electrical characteristics of their non-RoHS-compliant and/or non-Pb-free counterparts. For further information, see http://www.freescale.com or contact your Freescale sales representative. For information on Freescale’s Environmental Products program, go to http:// www.freescale.com/epp. Information in this document is provided solely to enable system and software implementers to use Freescale Semiconductor products. There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document. Freescale Semiconductor reserves the right to make changes without further notice to any products herein. Freescale Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Freescale Semiconductor 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 Semiconductor 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 Semiconductor does not convey any license under its patent rights nor the rights of others. Freescale Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Freescale Semiconductor product could create a situation where personal injury or death may occur. Should Buyer purchase or use Freescale Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold Freescale Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Freescale Semiconductor was negligent regarding the design or manufacture of the part. Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © Freescale Semiconductor, Inc., 2006. All rights reserved.