MMA7260QT FREESCALE | Alldatasheet
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Technical content
Features
Selectable Sensitiv ity (1.5g/2g/4g/6g) 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 High Sensitivity (800 mV/g @ 1.5g) 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 HDD MP3 Player: Freefall Detection Laptop PC: Freefall Detection, Anti-Theft Cell Phone: Image Stability, Text Sc roll, Motion Dialing, E-Compass Pedometer: Motion Sensing PDA: Text Scroll Navigation and Dead Reckoning: E-Compass Tilt Compensation Gaming: Tilt and Motion Sensing, Event Recorder Robotics: Motion Sensing
ORDERING INFORMATION
MMA7260QT 20 to +85°C 1622-02 QFN-16, Tray MMA7260QR2 20 to +85°C 1622-02 QFN-16,Tape & Reel MMA7260QT MMA7260QT: XYZ AXIS ACCELEROMETER ±1.5g/2g/4g/6g
16 LEAD
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 k Ω 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 1.5g 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.
- The response time between 10% of full scale Vdd 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 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 (800mV/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
- 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 Z OUT Z direction output voltage. 14 Y OUT Y direction output voltage. 15 X OUT X direction output voltage. 16 N/C No internal connection.
1512 XOUT
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Direction of Earths gravity field.* XOUT@ 0g = 1.65 V YOUT @ -1g = 0.85 V ZOUT@ 0g = 1.65 V XOUT @ -1g = 0.85 V YOUT @ 0g = 1.65 V ZOUT@ 0g = 1.65 V XOUT @ 0g = 1.65 V YOUT @ +1g = 2.45 V ZOUT@ 0g = 1.65 V XOUT @ +1g = 2.45 V YOUT @ 0g = 1.65 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 YOUT @ 0g = 1.65 V ZOUT@ +1g = 2.45 V XOUT @ 0g = 1.65 V YOUT @ 0g = 1.65 V ZOUT@ -1g = 0.85 V -X -Z +Z
MINIMUM RECOMMENDED FOOTPRINT FOR SURFACE MOUNTED APPLICATIONS Surface mount board layout is a critical portion of the total design. The footprint for the surface mount packages must be the correct size to ensure proper solder connection interface between the board and the package. With the correct footprint, the packages will self-align when subjected to a solder reflow process. It is always recommended to design boards with a solder mask layer to avoid bridging and shorting between solder pads. The flag underneath the package is internally connected to ground. It is not recommended for the flag to be soldered down. 0.50 6.0 Solder areasPin 1 ID (non metallic) 912 4.25 6.0 1.00 0.55 Flag Non-Solder areas
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