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TUSB4020BPHP Datasheet(PDF) 3 Page - Texas Instruments |
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TUSB4020BPHP Datasheet(HTML) 3 Page - Texas Instruments |
3 / 15 page www.ti.com Hardware Overview 2 Hardware Overview The TUSB4020B EVM board hardware can be divided into six functional areas: 2.1 TUSB4020BPHP The TUSB4020B EVM (U2 on the schematic) operates as a functional interconnect between an upstream connection to a USB host or hub and up to two directly connected downstream devices or hubs. More devices and hubs can be supported if arranged in tiers. The TUSB4020B is capable of supporting operation at High-Speed (HS), Full Speed (FS) or Low Speed (LS). In general, the speed of the upstream connection of the TUSB4020B EVM limits the downstream connections to that speed (HS and FS) or lower. The TUSB4020B requires a 24-MHz low ESR crystal, Y1 with a 1-M Ω feedback resistor. The crystal should be fundamental mode with a load capacitance of 12 pF – 24 pF and a frequency stability rating of ±100 PPM or better. To ensure a proper startup oscillation condition, a maximum crystal equivalent series resistance (ESR) of 50 Ω is recommended. The TUSB4020B can also use an oscillator or other clock source. When using an external clock source such as an oscillator, the reference clock should have ±100 PPM (or better) frequency stability and have less than 50-ps absolute peak-to-peak jitter (or less) than 25-ps peak-to-peak jitter after applying the USB 3.0 jitter transfer function. 2.2 USB Port Connectors VBUS is received from the upstream host or hub on J3. The TUSB4020B is configured as a self-powered hub, so there is not any significant current draw by the EVM from VBUS. The TUSB4020B does monitor the VBUS input after filtering through a resistor divider network of a 90.9-k Ω, 1% resistor, R9, and a 10- k Ω, 1% resistor, R10. VBUS cannot be directly connected to the TUSB4020B device. A bulk capacitor of at least 1 μF is required on the upstream port VBUS input to comply with the USB specification. The TUSB4020BEVM uses a 10- μF capacitor, C8. VBUS, sourced by the 5-V wall power input, J5, is provided to the downstream port connectors. The USB 2.0 specification limits the current consumption of a USB 2.0 device to 500 mA at 5 V. The current limiting parameter of the TPS2561 device, U3, is configured to 2.2 A to avoid any spurious overcurrent events due to bus-powered HDD spin-up power fluctuations or unnecessary limiting during USB charging. A production implementation could place stricter limits on this power consumption. An overcurrent event on any of the downstream port connectors will be reported to the TUSB4020B via the OVERCURxZ inputs. 2.2.1 USB Port Connector – Noise Filtering Each downstream VBUS output has a 150- μF bulk capacitor (C49, C51) as recommended by the TPS2561 data manual (SLVS930) to prevent in-rush current events on the downstream devices. In addition, there are ferrite beads and small capacitors on the VBUS lines to reduce noise and address ESD/EMI concerns. The TUSB4020BEVM also implements optional isolation using two small noise filtering capacitors and a 1- M Ω resistor between the earth ground of each connector and the digital ground of the EVM, this is not a requirement but should be used if ground isolation is desired. 2.3 Optional Serial EEPROM Each TUSB4020BEVM is equipped with an onboard EEPROM/socket placeholder, U1. A small I2C EEPROM can be installed to set the configuration registers as defined in the TUSB4020B data manual. In its default setting, the EVM does not have an EEPROM installed and instead uses the configuration inputs to determine any optional settings of the TUSB4020B. The EEPROM interface defaults to programmable (not write-protected) so that any installed EEPROM’s contents may be modified to test various settings. If an EEPROM data change is required, the values may be changed using the register access methods outlined in the TUSB4020B data sheet (#NUM#). In addition, a Microsoft® Windows® based EEPROM utility is available upon request. 3 SLLU219 – June 2015 TUSB4020BPHP Evaluation Module Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated |
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