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ST7265X Datasheet(PDF) 36 Page - STMicroelectronics |
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ST7265X Datasheet(HTML) 36 Page - STMicroelectronics |
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36 / 166 page  ST7265x 36/166 POWER SUPPLY MANAGEMENT (Cont’d) Figure 25. Power Supply Management: Dual Power Supply USB MODE STAND-ALONE STAND-ALONE RESET S/W STAND-ALONE USBVDD VDD pin PLL 48 MHz CLOCK CRYSTAL (12MHz) PLL CRYSTAL (12MHz) S/W Reset PLG INTERRUPT ON SUPPLY USBVIT+ REQUEST USBVIT- STATUS PROCESSING 12 1. Interrupt processing 2. Finish current processing PROCESS. STAND-ALONE 1 2 S/W Reset PROCESSING STAND-ALONE MODE USBEN HI-Z HI-Z voltage SUPPLY VOLTAGES SOURCE PLL OFF PLL ON PLL OFF STABLE 48 MHz UNDE SIGNAL ON/OFF FINED3 NO CLOCK 3. PLL start-up time (automatically controlled by hardware following a software reset) USB MODE NO CLOCK VPLLmin48 RESET RESET RESET VIT+(LVD) VIT-(LVD) RST 4 4. PLL running with frequency in the range of 48 to 24 MHz (see section 13.3.3 on page 131) 1 |
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