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TUSB2046B Datasheet(PDF) 10 Page - Texas Instruments |
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TUSB2046B Datasheet(HTML) 10 Page - Texas Instruments |
10 / 29 page SUSPND XTAL1 XTAL2 RESET TSTPLL/48MCLK EEDATA/GANGED EECLK 10, 14, 18, 22 8 5 6 26 4 29 30 27 32 1 2 24 23 20 19 16 15 12 11 9, 13, 17, 21 BUSPWR OVRCUR1 OVRCUR4 – PWRON1 PWRON4 – EXTMEM DP0 DP4 DP3 DP2 DP1 DM0 DM4 DM3 DM2 DM1 USB Transceiver Suspend/Resume Logic and Frame Timer HUB Repeater SIE USB Transceiver USB Transceiver USB Transceiver USB Transceiver OSC/PLL Serial EEPROM Interface Hub/Device Command Decoder Port 4 Logic Port 3 Logic Port 2 Logic Port 1 Logic SIE Interface Logic Hub Power Logic 10 TUSB2046B, TUSB2046I SLLS413L – FEBRUARY 2000 – REVISED JUNE 2017 www.ti.com Product Folder Links: TUSB2046B TUSB2046I Submit Documentation Feedback Copyright © 2000–2017, Texas Instruments Incorporated 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 USB Power Management External power-management devices, such as the TPS2044, are required to control the 5-V source to the downstream ports according to the corresponding values of the PWRON pin. Upon detecting any overcurrent conditions, the power-management device sets the corresponding OVRCUR pin of the TUSB2046x to a logic low. If GANGED is high, all PWRON outputs switch together and if any OVRCUR is activated, all ports transition to the power-off state. If GANGED is low, the PWRON outputs and OVRCUR inputs operate on a per-port basis. Both bus-powered and self-powered hubs require overcurrent protection for all downstream ports. The two types of protection are individual-port management (individual-port basis) or ganged-port management (multiple-port basis). Individual-port management requires power-management devices for each individual downstream port, but adds robustness to the USB system because, in the event of an overcurrent condition, the USB host only powers down the port that has the condition. The ganged configuration uses fewer power-management devices and thus has lower system costs, but in the event of an overcurrent condition on any of the downstream ports, all the ganged ports are disabled by the USB host. |
Similar Part No. - TUSB2046B_17 |
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Similar Description - TUSB2046B_17 |
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