Datenblatt-Suchmaschine für elektronische Bauteile |
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FAN3988 Datenblatt(PDF) 6 Page - Fairchild Semiconductor |
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FAN3988 Datenblatt(HTML) 6 Page - Fairchild Semiconductor |
6 / 9 page © 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN3988 • Rev. 1.0.10 6 Application Information Figure 7. Typical Application System with USB Transceiver With USB Transceiver (Figure 7) The FAN3988 sets the FLAG1 pin to logic HIGH or LOW as an indicator to the system controller that a standard USB device or a charger is connected to the USB port. The FAN3988 also monitors the VBUS for over- or under-voltage conditions. The FLAG2 pin is set LOW if VBUS is less than 3.3V or greater than 6.0V. In a standard USB configuration, there is a switch in the USB transceiver that is always ON in the full-speed mode. It is ON during the transition from full-speed mode to high-speed mode and is turned off after enumeration is complete. In a condition where D+ and D- are shorted when a charger is plugged into the USB port, the USB switch is ON and pulled to VDD, which is about 3.3V, making both D+ and D- HIGH and flag1 set HIGH – indicating that a charging device is connected to the port. In a condition where D+ and D- are connected to a standard USB device, the D+ is pulled to VDD and D- is set LOW (due to the 15KΩ pull-down in the USB tranceiver) and flag1 is LOW. If D+ and D- are open (floating), D+ is pulled to VDD and D- floats LOW, which makes flag1 LOW. Vbus D- Std 15K pull-down on D- input and 1.5K pull-up on D+ by USB transceiver. Control Flag 1 Vout D+ 1.5K GND Vdd Logic Battery Comparator OVP UVP USB Gnd D+ D- Vbus Flag 2 Rsense USB Transceiver Logic STD USB Device (ie USB Headphones) Std USB/ Charger Detect 15K |
Ähnliche Teilenummer - FAN3988 |
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Ähnliche Beschreibung - FAN3988 |
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