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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LC823450 데이터시트(PDF) 104 Page - ON Semiconductor |
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LC823450 데이터시트(HTML) 104 Page - ON Semiconductor |
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104 / 112 page  LC823450 www.onsemi.com 104 General RTC Mode (RTCMODE = 1) When only RTC operates, it is necessary to detect the drop of the voltage of Vdd1 and Vdd2 power supply, and set BACKUPB to Low which isolates VddRTC Domain from Vdd1 Domain. Moreover, it is necessary to detect the drop of the voltage of VddRTC power supply, and set VDET to Low. (The RTC operation stops). Figure 56. BACKUPB 0.2 × VDDRTC VDDRTC Min 0 ns 0.2 × VDDRTC VDET VDDRTC VDD1 VDD1 XIN32K … 0.7 × VDDRTC 0.2 × VDDRTC NRES 0.25 × VDD2 VDD2 VDD2 2.7 V Min 0 ns 1 & 2 is a reset condition of the internal logic circuit. Please refer to a chapter of Power supply sequence during the period when you should meet these 2 conditions. 0.93 V Min 0 ns 102. Internal control logic for isolation. 1 2 Figure 57. 103. VDD1 can be shut down while BACKUPB = Low BACKUPB ALL OUTPUT ALL INPUT ALL INPUT ALL OUTPUT VDD1 Domain VDDRTC Domain |
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