MMA7341L FREESCALE | Alldatasheet
Document overview
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Technical content
Features
- 3mm x 5mm x 1.0mm LGA-14 Package
- Low Current Consumption: 400 μA
- Sleep Mode: 3 μA
- Low Voltage Operation: 2.2 V – 3.6 V
- Selectable Sensitivity (±3g, ±11g)
- Fast Turn On Time (0.5 ms Enable Response Time)
- Self Test for Freefall Detect Diagnosis
- Signal Conditioning with Low Pass Filter
- Robust Design, High Shocks Survivability
- RoHS Compliant
- Environmentally Preferred Product
- Low Cost Typical Applications
- 3D Gaming: Tilt and Motion Sensing, Event Recorder
- 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
- Robotics: Motion Sensing
ORDERING INFORMATION
MMA7341LT -40 to +85°C 1977-01 LGA-14 Tray MMA7341LR1 -40 to +85°C 1977-01 LGA-14 7” Tape & Reel MMA7341LR2 -40 to +85°C 1977-01 LGA-14 13” Tape & Reel MMA7341L MMA7341L: XYZ AXIS ACCELEROMETER ±3g, ±11g
14 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
0.7 VDD
- For a loaded output, the measurements are observed after an RC filter consisting of an internal 32kΩ resistor and an external 3.3nF capacitor
the minimum to filter out internal clock noise.
- 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 3g 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.
- For optimal 0g offset performance, adhere to AN3484 and AN3447.
- 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.
- The response time between 10% of the full scale self test input voltage and 90% of the self test 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. is a measure of acceleration. proportional to acceleration. Figure 3. Simplified Transducer Physical Model accelerometer at any time before or after installation. electrostatic force is applied to each axis to cause it to deflect. accelerometer are functioning. pull-down to keep it at that sensitivity (440mV/g)). in the analog to digital conversion process. Table 3. g-Select Pin Description
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.
- Place a ground plane beneath the accelerometer to
all of the open ended terminals shown in Figure 6.
- Use a 3.3nF capacitor on the outputs of 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. the measurement input impedance. Table 4. Pin Descriptions
1 N/C No internal connection
5 V SS Power Supply Ground
8 N/C No internal connection
9 N/C No internal connection
11 N/C Unused for factory trim
12 N/C Unused for factory trim
13 Self Test Input pin to initiate Self Test
14 N/C Unused for factory trim
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+X +Z-X -Z Top Bottom : Arrow indicates direction of package movement.14-Pin LGA Package 123456 8 9 10 11 12 13 Side View XOUT @ 0g = 1.65 V YOUT @ +1g = 2.09 V ZOUT @ 0g = 1.65 V XOUT @ +1g = 2.09 V YOUT @ 0g = 1.65 V ZOUT @ 0g = 1.65 V XOUT @ -1g = 1.21 V YOUT @ 0g = 1.65 V ZOUT @0 g=1 . 6 5V XOUT @ 0g = 1.65 V YOUT @ -1g = 1.21 V ZOUT @ 0g = 1.65 V Direction of Earth's gravity field.* Top View XOUT @ 0g = 1.65 V YOUT @ 0g = 1.65 V ZOUT @ -1g =1.21 V XOUT @ 0g = 1.65 V YOUT @ 0g = 1.65 V ZOUT @ +1g = 2.09 V Top Top Bottom Bottom 123456 8 9 10 11 12 13 123456 8 9 10 11 12 13 13 12 11 10 9 8 123456 14 7 1 2 3 4 5 6 8 9 10 11 12 13 DYNAMIC ACCELERATION STATIC ACCELERATION * When positioned as shown, the Earth’s gravity will result in a positive 1g output.
Figure 7. MMA7341L Temperature Coefficient of Offset (TCO) and
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between the board and the package. avoid bridging and shorting between solder pads. Figure 8. LGA 14-Lead, 5 x 3 mm Die Sensor
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