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MMA7261Q Datasheet(PDF) 5 Page - Freescale Semiconductor, Inc |
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MMA7261Q Datasheet(HTML) 5 Page - Freescale Semiconductor, Inc |
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5 / 8 page  Analog Integrated Circuit Device Data Freescale Semiconductor 5 MMA7261Q 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. Do not exceed capacitor values of 2.2 or 3.3 µF on VDD-GND. 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 k Ω 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 (11 kHz for the sampling frequency). This will prevent aliasing errors. Table 4. Pin Descriptions Pin No. Pin Name Description 1 g-Select1 Logic input pin to select g level. 2 g-Select2 Logic input pin to select g level. 3VDD Power Supply Input 4VSS Power Supply Ground 5 - 7 N/C No internal connection. Leave unconnected. 8 - 11 N/C Unused for factory trim. Leave unconnected. 12 Sleep Mode Logic input pin to enable product or Sleep Mode. 13 ZOUT Z direction output voltage. 14 YOUT Y direction output voltage. 15 XOUT X direction output voltage. 16 N/C No internal connection. Leave unconnected. Top View 15 16 14 13 12 11 10 1 2 3 4 56 7 8 9 g-Select1 NC NC NC g-Select2 VDD VSS Sleep Mode Sleep Mode VDD VSS 0.1 µF 3 4 VDD 0.1 µF 14 0.1 µF 15 12 XOUT YOUT 1 k Ω 1 k Ω Logic Input 2 1 0.1 µF 13 ZOUT 1 k Ω Logic Inputs g-Select2 g-Select1 MMA7261Q POWER SUPPLY VDD VSS Sleep Mode g-Select1 g-Select2 XOUT YOUT ZOUT VDD VSS VRH P0 P1 P2 A/DIN A/DIN A/DIN C C C R R R C C C C C |
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