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ST7265X Datasheet(PDF) 39 Page - STMicroelectronics |
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ST7265X Datasheet(HTML) 39 Page - STMicroelectronics |
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39 / 166 page  ST7265x 39/166 POWER SUPPLY MANAGEMENT (Cont’d) 6.4.4 Power Management Application Example In the example shown in Figure 28, the VDD supply is provided by a step up. In this case the step up must be capable of tolerating voltages up to 5.5V on its Vout pin. Figure 28. Dual Power Supply Application Example (low current Storage Media) MPEG DAC Decoder Step Up 1.2V I2S VCC USB DP DM KEYBOARD USBVDD DTC I2C MP3 1.5Mbit/s Max USB port 2M - 128MByte FLASH VDDF STORAGE VPP GND USB 10 µF Cbus=40pF max 2 4 LCD DISPLAY LIGHT Audio AMP TDA7474 STA013 4.7 µF 50 µH VDD USBVDD POWER USB MANAGEMENT 5V DP DM GND 100nF Vdd in Stand-Alone mode Regulator output (2.8 - 3.5V) in USB mode 12V for STORAGE Switch USBVDD Switch DEC Switch LED level translator Flash prog. REGULATOR I/O LOGIC I2C =4.0-5.5V MEDIA THRESH USBEN 4.7µF 1 |
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