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MMA7361L Datasheet(PDF) 5 Page - Freescale Semiconductor, Inc |
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MMA7361L Datasheet(HTML) 5 Page - Freescale Semiconductor, Inc |
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5 / 11 page  Sensors Freescale Semiconductor 5 MMA7361L BASIC CONNECTIONS Pin Descriptions Figure 4. Pinout Description Figure 5. Accelerometer with Recommended Connection Diagram PCB Layout Figure 6. Recommended 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. 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. 4. Use a 3.3nF capacitor on the outputs of the accelerometer to minimize clock noise (from the switched capacitor filter circuit). 5. PCB layout of power and ground should not couple power supply noise. 6. Accelerometer and microcontroller should not be a high current path. 7. 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 (11 kHz for the sampling frequency). This will prevent aliasing errors. 8. 10M Ω or higher is recommended on X OUT, YOUT and ZOUT to prevent loss due to the voltage divider relationship between the internal 32 k Ω resistor and the measurement input impedance. Table 4. Pin Descriptions Pin No. Pin Name Description 1 N/C No internal connection Leave unconnected 2XOUT X direction output voltage 3YOUT Y direction output voltage 4ZOUT Z direction output voltage 5 VSS Power Supply Ground 6VDD Power Supply Input 7Sleep Logic input pin to enable product or Sleep Mode 8 NC No internal connection Leave unconnected 9 0g-Detect Linear Freefall digital logic output signal 10 g-Select Logic input pin to select g level 11 N/C Unused for factory trim Leave unconnected 12 N/C Unused for factory trim Leave unconnected 13 Self Test Input pin to initiate Self Test 14 N/C Unused for factory trim Leave unconnected N/C XOUT ZOUT YOUT VSS VDD Sleep N/C 0g-Detect g-Select Self Test N/C N/C N/C Top View 2 3 4 3.3 nF 3.3 nF 3.3 nF 13 10 6 5 7 Logic Input Logic Input Logic Input 0.1 μF VDD VDD VSS g-Select Self Test Sleep XOUT YOUT ZOUT MMA7361L 9 0g-Detect POWER SUPPLY VDD VSS Sleep g-Select 0g-Detect XOUT YOUT ZOUT VDD VSS VRH P0 P1 P2 A/DIN A/DIN A/DIN C C C C C C C C Self Test P3 |
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