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MMA6260Q Datasheet(PDF) 5 Page - Freescale Semiconductor, Inc |
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MMA6260Q Datasheet(HTML) 5 Page - Freescale Semiconductor, Inc |
5 / 11 page MMA6260Q Sensors Freescale Semiconductor 5 BASIC CONNECTIONS Pinout Description Figure 4. Pinout Description Figure 5. Accelerometer with Recommended Connection Diagram PCB Layout Figure 6. Recommend PCB Layout for Interfacing Accelerometer to Microcontroller NOTES: 1. Use 0.1 µF capacitor on VDD to decouple the power source. 2. Physical coupling distance of the accelerometer to the microcontroller should be minimal. 3. Flag underneath package is connected to ground. 4. Place a ground plane beneath the accelerometer to reduce noise, the ground plane should be attached to all of the open ended terminals shown in Figure 6. 5. Use an RC filter with 1.0 kΩ and 0.1 µF on the outputs of the accelerometer to minimize clock noise (from the switched capacitor filter circuit). 6. PCB layout of power and ground should not couple power supply noise. 7. Accelerometer and microcontroller should not be a high current path. 8. A/D sampling rate and any external power supply switching frequency should be selected such that they do not interfere with the internal accelerometer sampling frequency (16 kHz for Low IDD and 52 kHz for Standard IDD for the sampling frequency). This will prevent aliasing errors. 9. PCB layout should not run traces or vias under the QFN part. This could lead to ground shorting to the accelerometer flag. Pin No. Pin Name Description 1, 5 – 7, 13, 16 N/C No internal connection. Leave unconnected. 14 YOUT Output voltage of the accelerometer. YDirection. 15 XOUT Output voltage of the accelerometer. XDirection. 3VDD Power supply input. 4VSS The power supply ground. 2, 8 – 11 N/C Used for factory trim. Leave unconnected. 12 ST Logic input pin used to initiate self-test. Top View 15 16 14 13 12 11 10 1 2 3 4 56 7 8 9N/C N/C N/C ST NC NC VDD VSS MMA6260Q Series ST VDD VSS 0.1 µF 3 4 VDD 0.1 µF 14 0.1 µF 15 12 Logic Input XOUT YOUT 1 kΩ 1 kΩ X Output Signal Y Output Signal P0 A/D IN VRH VSS VDD ST YOUT VSS VDD 0.1 µF 1 kΩ 0.1 µF 0.1 µF Power Supply 0.1 µF A/D IN XOUT 0.1 µF 1 kΩ C C C R R C C |
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