Eurotech Titan User Manual page 44

TITAN user manual
The VBUS power supplies are derived from VCC_PER (+5V) which is an isolated +5V
supply switched under hardware control from the VCC input on J15 pin 1. GPIO 89 and
GPIO 22 control the power to VBUS1 and VBUS2 respectively. This is shown in the
following tables:
USB_PWE1
(GPIO 89)
0
1
USB_PWE2
(GPIO 22)
0
1
More information about the USB bus and the availability of particular USB peripherals
can be found at
USB client
The TITAN USB host port 2 can be configured under software to be a client.
The following diagram shows the connection between PL17 and a USB type A connector:
J10
1
9
Do NOT attempt to power the TITAN using the VBUS 1 or VBUS 2 pins!
VBUS 1 and VBUS 2 are isolated +5V supplies switched under hardware control
from VCC_PER.
ALWAYS use the USB client cable provided with the development kit. This cable
does not provide power down the cable and avoids reverse powering the TITAN
from a USB host when the TITAN has no power on the VCC input on J15 pin 1.
Reverse powering the TITAN from the VBUSn pins can make the TITAN operate
erratically and may cause serious damage to the TITAN.
44
Selected LVDS function
USB VBUS1 power off (default)
USB VBUS1 power on
Selected LVDS function
USB VBUS2 power off (default)
USB VBUS2 power on
www.usb.org.
USB connector type A
2
DATA- 2
DATA+ 2
GND
10 (SHIELD)
1
2
3
4
Issue D