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TUSB8040_1110 Datasheet(PDF) 10 Page - Texas Instruments |
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TUSB8040_1110 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 33 page  TUSB8040 SLLSE42F – SEPTEMBER 2010 – REVISED OCTOBER 2011 www.ti.com 2.1 Clock and Reset Signals Table 2-1. Clock and Reset Signals PIN NO. SIGNAL NAME TYPE DESCRIPTION PFP RKM Global power reset. This reset brings all of the TUSB8040 internal registers to their default states. When GRSTz is asserted, the device is completely nonfunctional. GRSTz I, PU 33 A18 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 XI I 76 A49 may alternately be 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 XO O 74 A48 driven by an external 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 VSSOSC I 75 B45 return path and it should not be connected to the PCB ground. If using an oscillator, this terminal should be connected to PCB Ground. 2.2 USB Upstream Signals Table 2-2. USB Upstream Signals PIN NO. SIGNAL NAME TYPE DESCRIPTION PFP RKM USB_SSTXP_UP O 63 B39 USB SuperSpeed transmitter differential pair (positive) USB_SSTXM_UP O 62 A42 USB SuperSpeed transmitter differential pair (negative) USB_SSRXP_UP I 66 A44 USB SuperSpeed receiver differential pair (positive) USB_SSRXM_UP I 65 B40 USB SuperSpeed receiver differential pair (negative) USB_DP_UP I/O 70 A46 USB high-speed differential transceiver (positive) USB_DM_UP I/O 69 B42 USB high-speed differential transceiver (negative) Precision resistor reference. A 9.09-K Ω ±1% resistor should be connected between USB_R1 PT 78 A50 USB_R1 and USB_R1RTN. USB_R1RTN PT 79 B47 Precision resistor reference return USB upstream port power monitor. The VBUS detection requires a voltage divider. USB_VBUS I 73 B44 The 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. 10 PIN DESCRIPTIONS Copyright © 2010–2011, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TUSB8040 |
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