MMA6271QT_07 FREESCALE | Alldatasheet
Document overview
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Technical content
Features
- Selectable Sensitivit y (2.5g/3.3g/6.7g/10g)
- Low Current Consumption: 500 µA
- Sleep Mode: 3 µA
- Low Voltage Operation: 2.2 V – 3.6 V
- 6mm x 6mm x 1.45mm QFN
- Fast Turn On Time
- High Sensitivity (2.5 g)
- Integral Signal Conditioning with Low Pass Filter
- Robust Design, High Shocks Survivability
- Environmentally Preferred Package
- Low Cost Typical Applications
- Laptop PC: Freefall Detection, Anti-Theft
- Cell Phone: Image Stability, Text Sc roll, Motion Dialing, E-Compass
- Motion Sensing
- PDA: Text Scroll
- Navigation and Dead Reckoning: E-Compass Tilt Compensation
- Gaming: Tilt and Motion Sensing, Event Recorder
- Vibration: Shock Sensing
ORDERING INFORMATION
Device Temp. Range Case No. Package MMA6271QT – 40 to +105°C 1622-02 QFN-16, Tray MMA6271QR2 – 40 to +105°C 1622-02 QFN-16,Tape & Reel MMA6271QT 16-LEAD QFN CASE 1622-02 MMA6271QT: XY AXIS ACCELEROMETER 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 observed 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 for 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 2.5g mode.
- The device can measure both + and – acceleration. With no input acceleration the output is at midsupply. For positive acceleration the output
DD/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 device’s ability to reject an acceleration 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 pull-down to keep it at that sensitivity (480 mV/g). recommended to set g-Select1 and g-Select2 to 2.5g 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
- Use 0.1 µF capacitor on VDD to decouple the power
- 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 N/C No internal connection. 14 Y OUT Y direction output voltage. 15 X OUT X direction output voltage. 16 N/C No internal connection.
12 XOUT
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Direction of Earth’s gravity field.* XOUT@ 0g = 1.65 V YOUT @ -1g = 1.17 V XOUT @ -1g = 1.17 V YOUT @ 0g = 1.65 V XOUT @ 0g = 1.65 V YOUT @ +1g = 2.13 V XOUT @ +1g = 2.13 V YOUT @ 0g = 1.65 V * When positioned as shown, the Earth’s 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 YOUT @ 0g = 1.65 V XOUT @ 0g = 1.65 V YOUT @ 0g = 1.65 V In 2.5g mode
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Figure 8. Stencil Design Guidelines
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Freescale Semiconductor 11 MMA6271QT PACKAGE DIMENSIONS CASE 1622-02 ISSUE B 16-LEAD QFN PAGE 3 OF 3
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