HD3SS6126EVM Datasheet, PDF (3/12 Pages) TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS – HD3SS6126EVM Device Reference Design

Preliminary
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HD3SS6126EVM Overview
1.2 HD3SS6126EVM Operation
Figure 2 shows the HD3SS6126EVM and its default setting. Four LEDs are used to indicate the selected
channel and current working mode: super speed (SS) or non-SS. Table 1 lists the working mode with
different switch selections. The independent output enable pin of the HD3SS6126 can be used to enable
or disable the output to save power in applications where low power is necessary.
Figure 2. Voice Interface - Example of HD3SS6126 KVM Switch EVM
Table 1. Switches and LED Indicators⁽¹⁾⁽²⁾
Mode SW1 SW2 SW3 D6
D7
D8
D9
1
2, 3 1, 2 1, 2
Off
Off
Off
Off
2
2, 3 1, 2 2, 3
Off
Off
Off
Off
3
2, 3 2, 3 1, 2
Off
Off
Off
Off
4
2, 3 2, 3 2, 3
Off
Off
Off
Off
5
1, 2 1, 2 1, 2
On
Off
On
Off
6
1, 2 2, 3 2, 3
Off
On
Off
On
(1) _SS
(2) _{Non-SS : High speed, full speed, or low speed}
Function
KVM HS/ID switch disabled
KVM HS/ID switch disabled
KVM HS/ID switch disabled
KVM HS/ID switch disabled
AC channel USB 3.0 selected
AB channel USB 3.0 selected
HD3SS6126EVM is powered from the USB hosts, D1 and D5, which are employed to avoid conflict
between the two voltage sources from different USB hosts. The smaller the forward voltage drop, the
better the system performance. U22 is a low R_on PMOS power switch used to enable or disable the EVM
and activate the USB device. Note that the HD3SS6126EVM draws some current from the VBUS, so TI
recommends low-power-consumption devices.
Per USB 3.0 specification, the 0201, 0.1-µF capacitors are preferred in the transmitter side, but 0402 still
works. To be well biased either by source or sink, TI recommends placing capacitors on only one side of
the HD3SS6126 device. Capacitors should be placed on either the host or device side, so no AC
capacitors are necessary for this EVM.
The HD3SS6126 incorporates internal ESD protection circuitry for all the differential pairs up to HBM 2000
kV and CDM 500 V, so no ESD protection devices populated on this EVM. However, TI recommends the
TPD2EUSB30 devices for any system where ESD events are a concern and the application equipment
exceeds the device specifications.
SLAU541 – October 2013
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HD3SS6126EVM Device Reference Design
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