Texas Instruments TS3USB221 quick start EVM Configuration and Description, EVM Description, V Ldo

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3 EVM Configuration and Description

3.1EVM Description

To conform to the USB 2.0 specification, the differential traces D+ and D- lines on the board are impedance matched to 90-Ωdifferential. The trace length of the through-path and the trace length through the TS3USB221/A/E switch are also matched for comparison purpose. The PCB is a simple four-layer top-side populated board (see the schematic and PCB layout in Section 3.4 and Section 3.5). The major features of the hardware design are detailed in the following sections.

3.2Jumper Configuration (J6 to J8)

The EVM has jumper J6 through J8 (see Figure 3) to provide configuration to the TS3USB221/A/E and the 3.3-V LDO. J6 allows switch output channel select, J7 provides switch enable control, and J8 provides 3.3-V LDO enable control. Table 1 lists all of the jumpers in the EVM and their respective functionality (all default settings are in bold).

10 kΩ TS3USB221/A/E

Output Select or

Ouput Enable

10 kΩ	3.3-V LDO
	Ouput Enable

Figure 3. Jumpers J6, J7, and J8 Configuration

Table 1. EVM Jumper Description

Jumper	Functionality	Configuration
J6	TS3USB221/A/E Select	Shunt J6 to select output 1
		Open J6 to select output 2
J7	TS3USB221/A/E Enable	Shunt J7 to enable the switch
		Open J7 to disable the switch
J8	3.3V LDO Enable	Shunt J8 to disable the LDO
		Open J8 to enable the LDO

The EVM provides USB connectors J1 through J5 to interface with other USB devices. Depending on the application need, the connectors can be de-soldered and changed to either type A or type B connector. See Table 2 for the default connectors on the EVM.

Table 2. EVM Connector Description

	Connector	Functionality		Configuration
	J1	USB Connector		Default as type B connector
				Can be replaced with type A connector
	J2	USB Connector		Default as type A connector
				Can be replaced with type B connector
	J3	USB Connector		Default as type B connector
				Can be replaced with type A connector
	J4	USB Connector		Default as type B connector
				Can be replaced with type A connector
	J5	USB Connector		Default as type B connector
				Can be replaced with type A connector
SCDU001A –July 2009 –Revised October 2009			TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer 5
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