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7534 Datasheet(PDF) 49 Page - Renesas Technology Corp |
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7534 Datasheet(HTML) 49 Page - Renesas Technology Corp |
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49 / 55 page ![]() 7534 Group Rev.2.00 Jun 21, 2004 page 49 of 54 REJ03B0099-0200Z Fig. 52 Handling of VCC, USBVREFOUT pins of M37534M4-XXXGP Outline 32P6U-A P07 P10/RXD/D- P11/TXD/D+ P12/SCLK P13/SDATA P14/CNTR0 P20/AN0 P21/AN1 32 31 30 29 28 27 26 25 P34(LED4) P33(LED3) P32(LED2) P31(LED1) P30(LED0) VSS XOUT XIN 9 10 11 12 13 14 15 16 M37534M4-XXXGP 1.5k Ω Reason of ➀ is to reduce the effect by switcing noise of microcomputer to the analog circuit generating USBVREFOUT output. Use the bigger capacitor and connect to device at the shortest distance. Reason of ➁ is to prevent the instability of the USBVREFOUT output due to external noise. ➁ ➀ Connect a capacitor to a device as close as possible. For the capacitor, a ceramic capacitor or an electrolytic capacitor of 0.22 µF is recommended. Connect a bypass capacitor to a device as close as possible. For the capacitor, a ceramic capacitor or an electrolytic capacitor of 1.0 µF is recommended. |
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