EVB-USB5744 Datasheet, PDF (15/27 Pages) Microchip Technology – EVB-USB5744 Evaluation Board User’s Guide

EVB-USB5744 Evaluation Board User’s Guide
The table below describes the port enable/disable strap options available for all four
ports on the USB5744.
TABLE 2-3: PORT ENABLE/DISABLE STRAP OPTIONS
Downstream
Port
Associated
Switch
Switch Position
LED
1
SW1
1-2, 4-5 = Port Enabled (Default)
2-3, 5-6 = Port Disabled
2
SW2
1-2, 4-5 = Port Enabled (Default)
2-3, 5-6 = Port Disabled
3
SW3
1-2, 4-5 = Port Enabled (Default)
2-3, 5-6 = Port Disabled
4
SW4
1-2, 4-5 = Port Enabled (Default)
2-3, 5-6 = Port Disabled
2.2 POWER SOURCE - SELF-POWERED
The EVB-USB5744 only supports self-powered operation, and is powered through one +12.0 V
regulated 'wall wart' external power supply. The power supply plugs into the 2.5 mm connector
J9 on the board. Alternatively, an external voltage can be injected onto the J6 Ext. 12 V header,
which is not populated by default. The +12.0 V feeds a 6 A regulator which outputs +5.25 V
across the board. This +5.25 V output supplies the +3.3 V and +1.2 V onboard regulators.
2.3 DOWNSTREAM PORT POWER CONTROL
USB power to the four downstream ports are controlled via port power controllers with
auto-discharge function. This provides up to 2.1 A of USB battery charging power to
each port, limited to a total of 5 A at any one time.
FIGURE 2-4:
INITIAL CONFIGURATION
DS50002306A-page 15
 2014 Microchip Technology Inc.