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MPXM2102AS 数据表(PDF) 95 Page - Motorola, Inc |
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MPXM2102AS 数据表(HTML) 95 Page - Motorola, Inc |
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95 / 670 page  MMA3201D 2–59 Motorola Sensor Device Data www.motorola.com/semiconductors Pin No. Pin Name Description 1 thru 3 — Redundant Vss. Leave unconnected. 4 — No internal connection. Leave unconnected. 5 ST Logic input pin used to initiate self–test. 6 XOUT Output voltage of the accelerometer. X Direction. 7 STATUS Logic output pin to indicate fault. 8 VSS The power supply ground. 9 VDD Power supply input. 10 AVDD Power supply input (Analog). 11 YOUT Output voltage of the accelerometer. Y Direction. 12 thru 16 — Used for factory trim. Leave unconnected. 17 thru 20 — No internal connection. Leave unconnected. 10 XOUT YOUT MMA3201D ST VDD VSS X OUTPUT SIGNAL R1 1 k Ω C2 0.01 µF 5 9 8 LOGIC INPUT VDD C1 0.1 µF Figure 4. SOIC Accelerometer with Recommended Connection Diagram STATUS 7 6 Y OUTPUT SIGNAL C3 0.01 µF R2 1 k Ω AVDD 11 PCB Layout P0 A/D IN VRH VSS VDD ST YOUT 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 A/D IN XOUT R 0.01 µF C 1 k Ω NOTES: • Use a 0.1 µF capacitor on VDD to decouple the power source. • Physical coupling distance of the accelerometer to the mi- crocontroller 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 outputs 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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