MMA6280QT FREESCALE | Alldatasheet
Document overview
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Technical content
Features
Selectable Sensitivity (1.5 g / 2 g / 4 g / 6 g) Low Current Consumption: 500 µA Sleep Mode: 3 µA Low Voltage Operation: 2.2 V 3.6 V 6 mm x 6 mm x 1.45 mm QFN High Sensitivity (800 mV/g @1.5 g) Fast Turn On Time Integral Signal Conditioning with Low Pass Filter Robust Design, High Shocks Survivability Pb-Free Terminations Environmentally Preferred Package Low Cost Typical Applications Portable Applications: Tilt Monitoring, Anti-Theft Pedometer: Motion Sensing PDA: Text Scroll Gaming: Tilt and Motion Sensing, Event Recorder Robotics: Motion Sensing Impact Monitoring (shipping/handling, black box event recorder) Vibration Monitoring and Recording (appliance balance, seismic, smart motors, etc.).
ORDERING INFORMATION
Device Name Temperture Range Package Drawing Package MMA6280QT 40 to +105°C 1622-02 QFN-16, Tray MMA6280QR2 40 to +105°C 1622-02 QFN-16,Tape & Reel MMA6280QT MMA6280QT: XZ AXIS ACCELEROMETER ±1.5 g / 2 g / 4 g / 6 g 16-LEAD QFN CASE 1622-02 Bottom View Figure 1. Pin Connections
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Figure 2. Simplified Accelerometer Functional Block Diagram
2000 V ESD protection circuitry, extra precaution must be
may be detrimental to its performance. Table 1. Maximum Ratings
- Dropped onto concrete surface from any axis.
Table 2. Operating Characteristics
- For a loaded output, the measurements are observ ed after an RC filter consisting of a 1.0 kΩ resistor and a 0.1 µF capacitor on VDD-GND.
- These limits define the range of operation fo r which the part will meet specification.
- Within the supply range of 2.2 and 3.6 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.
- This value is measured with g-Select in 1.5 g mode.
- 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. For negative acceleration, the output will decrease below VDD/2.
- These values represent the 10th percentile, not the minimum.
- These values represent the 90th percentile, not the maximum.
- The response time between 10% of full scale V DD input voltage and 90% of the final operating output voltage.
- The response time between 10% of full scale Sleep Mode input voltage and 90% of the final operating output voltage.
- A measure of the devices ability to reject an acce leration applied 90° from the true axis of sensitivity.
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integrated-circuit accelerometer. using a bulk micromachined cap wafer. is a measure of acceleration. proportional to acceleration. Figure 3. Simplified Transducer Physical Model pulldown to keep it at that sensitivity (800 mV/g). recommended to set g-Select1 and g-Select2 to 1.5g mode. resume to normal mode of operation. in the analog to digital conversion process. Table 3. g-Select Pin Descriptions
Figure 4. Pinout Description Figure 5. Accelerometer with Recommended Figure 6. Recommended PCB Layout for Interfacing
- To ensure start up operation below 0°C, verify VDD
- Physical coupling distance of the accelerometer to
the microcontroller should be minimal.
- The flag underneath the package is internally
- Place a ground plane beneath the accelerometer to
all of the open ended terminals shown in Figure 6.
- Use an RC filter with 1.0 kΩ and 0.1 µF on the
(from the switched capacitor filter circuit).
- PCB layout of power and ground should not couple
- Accelerometer and microcontroller should not be a
- A/D sampling rate and any external power supply
frequency). This will prevent aliasing errors.
- PCB layout should not run traces or vias under the
Table 4. Pin Descriptions 1 g-Select1 Logic input pin to select g level. 2 g-Select2 Logic input pin to select g level. 5 - 7 N/C No internal connection. 8 - 11 N/C Unused for factory trim.
12 Sleep Mode Logic input pin to enable product or
13 Z OUT Z direction output voltage. 14 N/C No internal connection. 15 X OUT X direction output voltage. 16 N/C No internal connection.
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Direction of Earths gravity field.* XOUT@ 0g = 1.65 V ZOUT @ 0g = 1.65 V XOUT @ -1g = 0.85 V ZOUT @ 0g = 1.65 V XOUT @ 0g = 1.65 V ZOUT @ 0g = 1.65 V XOUT @ +1g = 2.45 V ZOUT @ 0g = 1.65 V * When positioned as shown, the Earths gravity will result in a positive 1g output. Side View Top Bottom : Arrow indicates direction of mass movement. Top View Side View XOUT @ 0g = 1.65 V ZOUT @ +1g = 2.45 V XOUT @ 0g = 1.65 V ZOUT @ -1g = 0.85 V (For reference only) -Z +Z
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between the board and the package. avoid bridging and shorting between solder pads.
- NSMD (Non Solder Mask Defined) is shown in
- Solder mask opening = PCB land pad +0.1 mm.
- Stencil aperture size = PCB land pad 0.025mm, as
- Do not place insertion components or vias at a
distance less than 2mm from the package land area.
- Signal trace connected to pads should be as
Figure 8. Wider trace can be continued after the
- Use a standard pick and place process and
equipment (no hand soldering process).
- It is recommended to use a cleanable solder paste
- It is recommended to avoid screwing down the PCB
- PC boards should be rated for multiple reflow of lead-
free conditions with 260°C maximum temperature. Figure 7. NSMD Solder Mask Design Guidelines continued after these traces.
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Figure 8. Stencil Design Guidelines
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Freescale Semiconductor 11 MMA6280QT PACKAGE DIMENSIONS CASE 1622-02 ISSUE B 16-LEAD QFN PAGE 3 OF 3
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