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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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MRF49XA-I/T 데이터시트(PDF) 46 Page - Microchip Technology |
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MRF49XA-I/T 데이터시트(HTML) 46 Page - Microchip Technology |
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46 / 102 page  MRF49XA DS70590C-page 46 Preliminary © 2009-2011 Microchip Technology Inc. 3.2 VDD Line Filtering During the Reset event (caused by power-on, glitch on the supply line or Software Reset), the VDD line should be kept clean. Noise or a periodic disturbing signal superimposed on the supply voltage may prevent the device from getting out of the Reset state. To avoid this, adequate filters should be made available on the power supply lines to keep the distorting signal level below 100 mVp-p, in the DC-50 kHz range for 200 ms, from VDD ramp start. The usage of regulators or SMPS may sometimes introduce switching noise on the VDD line, so follow the power supply manufacturer’s recommendations on how to decrease the ripple of regulator IC and/or how to shift the switching frequency while using SMPS. The registers associated with power line filtering are: •STSREG (see Register 2-1) • FIFORSTREG (see Register 2-10) • WTSREG (see Register 2-14) |
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