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TUSB8040A1RKMR Datasheet(PDF) 11 Page - Texas Instruments |
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TUSB8040A1RKMR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 38 page TUSB8040A1 www.ti.com SLLSEE5A – FEBRUARY 2013 – REVISED MAY 2013 2.1 Signal Descriptions Table 2-1. Signal Descriptions TYPE DESCRIPTION I Input O Output I/O Input/output PD, PU Internal pull-down/pull-up PT Passive pass through P Power Supply G Ground 2.2 Clock and Reset Signals Table 2-2. Clock and Reset Signals PIN SIGNAL NAME TYPE DESCRIPTION NO. Global power reset. This reset brings all of the TUSB8040A1 internal registers to their default GRSTz I, PU A18 states. When GRSTz is asserted, the device is completely nonfunctional. GRSTz should be asserted a minimum of 3 ms after all power rails are valid at the device. Crystal input. This terminal is the crystal input for the internal oscillator. The input may alternately be XI I A49 driven by the output of an external oscillator. When using a crystal a 1-M Ω feedback resistor is required between XI and XO. Crystal output. This terminal is crystal output for the internal oscillator. If XI is driven by an external XO O A48 oscillator this pin may be left unconnected. When using a crystal a 1-M Ω feedback resistor is required between XI and XO. Oscillator return. If using a crystal, the load capacitors should use this signal as the return path and VSSOSC I B45 it should not be connected to the PCB ground. If using an oscillator, this terminal should be connected to PCB Ground. 2.3 USB Upstream Signals Table 2-3. USB Upstream Signals SIGNAL NAME TYPE PIN NO. DESCRIPTION USB_SSTXP_UP O B39 USB SuperSpeed transmitter differential pair (positive) USB_SSTXM_UP O A42 USB SuperSpeed transmitter differential pair (negative) USB_SSRXP_UP I A44 USB SuperSpeed receiver differential pair (positive) USB_SSRXM_UP I B40 USB SuperSpeed receiver differential pair (negative) USB_DP_UP I/O A46 USB high-speed differential transceiver (positive) USB_DM_UP I/O B42 USB high-speed differential transceiver (negative) Precision resistor reference. A 9.09-k Ω ±1% resistor should be connected between USB_R1 PT A50 USB_R1 and USB_R1RTN. USB_R1RTN PT B47 Precision resistor reference return USB upstream port power monitor. The VBUS detection requires a voltage divider. The USB_VBUS I B44 signal USB_VBUS must be connected to VBUS through a 90.9-k Ω ±1% resistor, and to ground through a 10-k Ω ±1% resistor from the signal to ground. Copyright © 2013, Texas Instruments Incorporated PIN DESCRIPTIONS 11 Submit Documentation Feedback Product Folder Links: TUSB8040A1 |
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