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MPXM2102AS 数据表(PDF) 82 Page - Motorola, Inc |
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MPXM2102AS 数据表(HTML) 82 Page - Motorola, Inc |
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82 / 670 page  MMA2201D 2–46 Motorola Sensor Device Data www.motorola.com/semiconductors Pin No. Pin Name Description 1 thru 3 — No internal connection. Leave unconnected. 4 ST Logic input pin used to initiate self–test. 5 VOUT Output voltage of the accelerome- ter. 6 — No internal connection. Leave unconnected. 7 VSS The power supply ground. 8 VDD The power supply input. 9 thru 13 Trim pins Used for factory trim. Leave unconnected. 14 thru 16 — No internal connection. Leave unconnected. MMA2201D ST VDD VSS VOUT OUTPUT SIGNAL R1 1 k Ω 5 C2 0.01 µF 4 8 7 LOGIC INPUT VDD C1 0.1 µF Figure 4. SOIC Accelerometer with Recommended Connection Diagram STATUS 6 PCB Layout P0 A/D IN VRH VSS VDD ST VOUT VSS VDD 0.01 µF C 1 k Ω 0.1 µF C 0.1 µF POWER SUPPLY C R C 0.1 µF Figure 5. Recommend PCB Layout for Interfacing Accelerometer to Microcontroller P1 STATUS NOTES: • Use a 0.1 µF capacitor on VDD to decouple the power source. • Physical coupling distance of the accelerometer to the microcontroller should be minimal. • 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 4. • Use an RC filter of 1 kΩ and 0.01 µF on the output of the accelerometer to minimize clock noise (from the switched capacitor filter circuit). • PCB layout of power and ground should not couple power supply noise. • Accelerometer and microcontroller should not be a high current path. • A/D sampling rate and any external power supply switching frequency should be selected such that they do not inter- fere with the internal accelerometer sampling frequency. This will prevent aliasing errors. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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