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TUSB211IRWBR Datasheet(PDF) 9 Page - Texas Instruments |
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TUSB211IRWBR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 21 page 9 TUSB211, TUSB211I, TUSB211-Q1 www.ti.com SLLSEO0C – MAY 2015 – REVISED JUNE 2016 Product Folder Links: TUSB211 TUSB211I TUSB211-Q1 Submit Documentation Feedback Copyright © 2015–2016, Texas Instruments Incorporated Typical Application (continued) 8.2.1 Design Requirements TUSB211 requires a valid reset signal as described in the power supply recommendations section. The capacitor C4 is not required if a microcontroller drives the RSTN pin according to recommendations. Pin 11 VREG is an internal LDO output that requires a 0.1 μF external capacitor to GND to stabilize the core. Pin 6 EQ requires an external pulldown resistor if EQ levels 0-2 are needed. If EQ level 3 is needed, then the EQ pin can be left floating. 8.2.2 Detailed Design Procedure The ideal EQ setting is dependent upon the signal chain loss characteristics of the target platform. The general recommendation is to start with EQ level 0, and then increment to EQ level 1, etc. if permissible. In order for the TUSB211 to recognize any change to the EQ setting, the RSTN pin must be toggled. This is because the EQ pin is latched on power up and the pin is ignored thereafter. In addition, TUSB211 does not compensate for any DC attenuation in the signal path. Therefore, we suggest minimizing DC loss (i.e. resistance) in the system design. As a consequence, this might lead to increased line capacitance. This is acceptable because the TUSB211 can compensate for the additional capacitive load. Placement of the device is also dependent on the application goal. The table below summarizes our recommendations. Table 1. TUSB211 Platform Placement Guideline PLATFORM GOAL SUGGESTED TUSB211 PLACEMENT Pass USB Near End Mask Close to measurement point Pass USB Far End Eye Mask Close to USB PHY Cascade multiple 211s to improve device enumeration Midway between each USB interconnect 8.2.2.1 NOTE USB-IF certification tests for High Speed eye masks require the mandated use of the USB-IF developed test fixtures. These test fixtures do not require the use of oscilloscope probes. Instead they use SMA cables. More information can be found at the USB-IF Compliance Updates Page. It is located under the ‘Electricals’ section, ID 86 dated March 2013. The following procedure must be followed before using any oscilloscope compliance software to construct a USB High Speed Eye Mask: 8.2.2.1.1 For a Host Side Application 1. Configure the TUSB211 to the desired EQ setting 2. Power on (or toggle the RSTN pin if already powered on) the TUSB211 3. Using SMA cables, connect the oscilloscope and the USB-IF host-side test fixture to the TUSB211 4. Enable the host to transmit USB TEST_PACKET 5. Execute the oscilloscope’s USB compliance software. 6. Repeat the above steps in order to re-test TUSB211 with a different EQ setting |
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