EVB-USB5734 Datasheet, PDF (17/37 Pages) Microchip Technology – EVB-USB5734 Evaluation Board User’s Guide

FIGURE 2-6:
UART SELECT
2.4.4 Configuration Source - Internal Default
When the USB5734 does not detect a valid SPI Flash image or SMBus configuration
upon power-up, the EVB-USB5734 uses internal default register settings. It also sets
the Vendor ID, Product ID, Language ID, and Device ID, and additional settings from
internal ROM code.
2.4.5 Strapping Option
If configuration is not done through SPI, additional configuration is available through
two functions: CFG_BC and CFG_Non-Rem. The controls are configured by selecting
ONLY one of six resistor values for each pin. These are read by the USB5734 device
and the BC and Non-Rem behavior of the downstream facing ports are determined.
To use the strapping option (which is the default configuration setup), set the Config.
Select switch (SW7) to the Strap position. The green “Strap” LED will light. Select the
desired CFG_BC and CFG_Non-Rem options by enabling only one position for each
of the Config_Bat_Chrg Select and Config_Non_Rem Select switches (SW5 and
SW6). The default setup for SW5 is to slide pin 5 to the com side of the switch (towards
the downstream facing ports) which configures all four downstream ports to be enabled
for battery charging. The default setup for SW6 is to slide pin 1 to the com side of the
switch (towards the downstream facing ports) which configures all four downstream
ports to be removable.
 2015 Microchip Technology Inc.
DS50002350B-page 17