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MGC3140 数据表(PDF) 35 Page - Microchip Technology |
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MGC3140 数据表(HTML) 35 Page - Microchip Technology |
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35 / 49 page ![]() 8.5 Reference Schematic North Electrode South Electrode Center Electrode VDD 10 KΩ 10 KΩ 10 KΩ 10 KΩ IS1 IS2 VDD VDD n.p: not populated IS1 IS2 SDA SCL GPIO/IRQ HOST RESET CONTROL MCLR MCLR VDD VDD VDD VDD IS2 IS1 Mode (Address) I2C Slave Address 1 (0x42) Reserved 0 1 0 0 TX Electrode VDD VDD TX4 R0 = 1K 1) R1 = 4.7K 1) R2 = 4.7K 1) R3 = 1K 1) R4 = 4.7K 1) TX1 TX0 TX2 TX3 TX4 Gesture Port 5 SYNC DNC RX1 DNC DNC MCLR VSS VDD IS1 IS2 RX2 1 2 3 4 5 6 7 8 9 10 11 12 DNC DNC VSS TS MODE VDD SCL SDA TX4 TX3 TX2 TX1 36 35 34 33 32 31 30 29 28 27 26 25 10 KΩ 1 ) Specific values should be reviewed with your Microchip representative. 10 μF C1 = 470pF 1) MGC3140-E/MV Test Point TX3 TX2 TX1 MODE GP5 SYNC VDD 8.6 Layout Recommendation This section provides a brief description of layout hints for a proper system design. The PCB layout requirements for MGC3140 follow the general rules for a mixed signal design. In addition, there are certain requirements to be considered for the sensor signals and electrode feeding lines. The chip should be placed as close as possible to the electrodes to keep their feeding lines as short as possible. Furthermore, it is recommended to keep MGC3140 away from electrical and thermal sources within the system. A two layer PCB layout is sufficient to enable analog and digital signals to be separated from each other to minimize crosstalk. The individual electrode feeding lines should be kept as far as possible apart from each other. VDD lines should be routed as wide as possible. MGC3140 requires a proper ground connection on all VSS pins which can be connected together. MGC3140 Application Architecture © 2018 Microchip Technology Inc. DS40002037A-page 35 |
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