EVM Installation

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SW2_3 (off):

PWRCTL_POL_TDO Switch. The TUSB4041 has an internal pulldown on this terminal,

so port power control polarity defaults to active high. If the switch is set to the ON

position, the terminal is pulled high and the port power control polarity changes to active

low.

SW2_4 (on):

FULLPWRMGMTZ. The TUSB4041 has an internal pullup on this terminal, so the

TUSB4041 defaults to a non-full power management mode. If the switch is set to the ON

position, the terminal is pulled low and full power management mode is enabled. This

means that the TUSB4041 reports that it supports downstream port power switching in

the USB descriptors it sends to the USB host. Since the TUSB4041PAPEVM does

implement downstream port power switching, full power management mode should be

enabled.

SW2_5 (off):

SCL_SMBCLK Switch. The TUSB4041 has an internal pulldown on this terminal, so the

serial EEPROM/SMBUS interface is disabled. If the switch is set to the ON position, a

pullup resistor is connected to the serial clock terminal to indicate that an I

may be attached (along with a pullup resistor on SDA).

SW2_6 (off):

SDA_SMBDAT Switch. The TUSB4041 has an internal pulldown on this terminal, so the

serial EEPROM/SMBUS interface is disabled. If the switch is set to the ON position, a

pullup resistor is connected to the serial clock terminal to indicate that an I

may be attached (along with a pullup resistor on SCL).

SW2_7 (NC):

Not connected

SW2_8 (NC):

Not connected

4

EVM Installation

To install the EVM, perform the following steps:

1. Attach a 5-V, 3-A wall power source to J6. LEDs D4 should be lit.

2. Attach a USB cable between J4 and a USB host. LEDs D1, should be lit.

5

Troubleshooting

Case 1: Device function(s) are “banged out” in Device Manager.

•

Make sure that the latest updates are installed for the operating system

•

Make sure that the latest drivers are installed for the host controller

Case 2: The EVM does not work at all.

•

Verify that all switches are in their default state and the EVM is powered on with a 5-V source with

adequate current to support any bus-powered devices (3 A+).

•

If installed, remove the serial EEPROM from the EEPROM socket. The EVM does not require an

EEPROM to operate.

•

In the case where a 12-V power supply has been attached to the EVM, the fault is non-recoverable.

6

TUSB4041PAP Evaluation Module

SLLU227 – September 2015

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