Hardware Overview

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2.3

Optional Serial EEPROM

Each TUSB4041PAPEVM is equipped with an onboard EEPROM/socket placeholder, U2. A small I

EEPROM can be installed to set the configuration registers as defined in the TUSB4041 data manual

(SLLSEK3A). In its default setting, the EVM does not have an EEPROM installed and instead uses the

configuration inputs to determine any optional settings of the TUSB4041.

The EEPROM interface defaults to programmable (not write-protected) so that any installed EEPROM’s

contents may be modified to test various settings. If an EEPROM data change is required, the values may

be changed using the register access methods outlined in the TUSB4041 data sheet. In addition, a

2.4

Power

The TUSB4041PAPEVM operates from the power provided by a 5-V wall power adapter, J6, or bus power

supplied by a USB host. It is recommended to use a wall power adapter that is capable of sourcing 4 A to

5 A because the hub must be able to source significant power on its downstream ports (500 mA per port).

The TUSB4041PAPEVM uses a single-channel LDO voltage regulator to drop 5 V to 3.3 V. The

TPS7A4533, U4, is a 1.5-A output linear regulator (SLVS720). The 1.1-V core voltage required by the

TUSB4041 is sourced by the 3.3-V rail to reduce unnecessary heat dissipation. The TPS74801, U6, is a

1.5-A output single-channel LDO linear regulator (SBVS074). Both regulators require few external passive

components and are appropriately rated for heat dissipation.

2.5

Hub Configuration

The TUSB4041PAPEVM can be configured by setting several inputs to the TUSB4041 that are sampled

at power-on reset or using an optional serial EEPROM or SMBUS host. A production implementation

without EEPROM or SMBUS could either rely on the default internal pullup or pulldown resistor for each

configuration input or over-ride it with an external pullup or pulldown resistor. The settings can be modified

using SW1 and SW2 on the EVM. Descriptions of the possible configuration changes are included in

Section 3.1.

2.6

Optional Circuitry

The following list provides the optional circuitry available on the TUSB4041PAPEVM:

•

D4 – Indicates BOARD_3P3V is active

•

The switch (SW1, SW2) and headers (J8, JP6) provided on the TUSB4041PAPEVM are intended for

lab evaluation only and are not required for production designs.

4

TUSB4041PAP Evaluation Module

SLLU227 – September 2015

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