www.ti.com

Hardware Set Up

3

Hardware Set Up

3.1

Configuration Switch

The TI TUSB4041PAPEVM has a set of switches to facilitate configuration changes. Changing these

switch settings without a complete understanding of the result is not recommended. Configuration inputs

are only read by the TUSB4041 during power on reset, changing the switch settings while the EVM is

powered on will have no effect. Please refer to the EVM schematics for additional information (included in

the appendix).

The switch definitions are as follows, with the standard setting in parenthesis:

SW1_1 (off):

TEST_TRSTZ. This pin is reserved for factory test.

SW1_2 (off):

SMBUSz Switch. The TUSB4041 has an internal pullup on this terminal, so I

mode is enabled by default. If the switch is set to the ON position, the terminal is pulled

low and SMBUS mode is enabled.

SW1_3 (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).

SW1_4 (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).

SW1_5 (off):

PWRCTL1_BATEN1 Switch. The TUSB4041 has an internal pulldown on this terminal,

so USB Battery Charging mode on Port 1 is disabled by default. If the switch is set to the

ON position, the terminal is pulled high and battery charging is enabled on downstream

Port 1.

SW1_6(off):

PWRCTL2_BATEN2 Switch. The TUSB4041 has an internal pulldown on this terminal,

so USB Battery Charging mode on Port 2 is disabled by default. If the switch is set to the

ON position, the terminal is pulled high and battery charging is enabled on downstream

Port 2.

SW1_7 (off):

PWRCTL1_BATEN1 Switch. The TUSB4041 has an internal pulldown on this terminal,

so USB Battery Charging mode on Port 3 is disabled by default. If the switch is set to the

ON position, the terminal is pulled high and battery charging is enabled on downstream

Port 3.

SW1_8(off):

PWRCTL2_BATEN2 Switch. The TUSB4041 has an internal pulldown on this terminal,

so USB Battery Charging mode on Port 4 is disabled by default. If the switch is set to the

ON position, the terminal is pulled high and battery charging is enabled on downstream

Port 4.

SW2_1 (on):

AUTOENZ Switch. Automatic charge mode enable/HS suspend status The value of the

pin is sampled at the deassertion of reset to determine if automatic mode is enabled as

follows:

0 = Automatic mode is enabled on ports that are enabled for battery charging when the

hub is unconnected. Note that CDP is not supported on Port 1 when operating in

automatic mode.

1 = Automatic mode is disabled.

This value is also used to set the autoEnz bit in the Battery Charging Support Register.

After reset, this signal indicates the high-speed USB suspend status of the upstream port

if enabled through the Additional Feature Configuration Register. When enabled, a value

of 1 indicates the connection is suspended.

SW2_2 (on):

GANGED_HS_UP Switch. The TUSB4041 has an internal pullup on this terminal, so

ganged mode is enabled by default. If the switch is set to the ON position, the terminal is

pulled low and individual port power control mode is enabled. Since the

TUSB4041PAPEVM does implement individual port power controls, this terminal should

be set high.

5

SLLU227 – September 2015

TUSB4041PAP Evaluation Module

Submit Documentation Feedback

Copyright © 2015, Texas Instruments Incorporated