Hardware Configuration
2014 Microchip Technology Inc.
DS50002252A-page 11
2.1.2
USB3503 Configuration
Default:
I
2
C configuration is bypassed by default on the EVB-USB3503 QFN evalua-
tion board. The hub will use the internal default configuration and automatically transi-
tion to the hub communication stage when it is powered on.
I
2
C Option:
SW3 must be switched to the 1-2 (see
) position before
powering on the hub. SW3 in position 1-2 pulls HUB_CONNECT to ground and will
hold the hub in its configuration stage. The hub will not transition to the hub
communication stage until CONNECT_N bit of SP_ILOCK register is negated or until
SW3 is switched back to position 2-3. Additional hardware capable of two-wire I
2
C
communication is required for I
2
C operation. For additional information regarding I
2
C
communication protocol on the USB3503, see the USB3503 data sheet.
FIGURE 2-1:
RECOMMENDED USAGE OF THE HSIC EXTRACTION TOOL
Usage Precautions
1. Plugs
(1) Mating/Unmating
1) To disconnect the connectors, insert the end portion of U.FL-LP-N-2 under the
connector flanges and pull off vertically, in the direction of the connector mating axis.
2) To mate the connectors, the mating axes of both connectors must be aligned. The
“
click
”
confirms a fully-mated connection. Do not attempt to insert on an extreme
angle.
(2) Pull forces on the cable after the connectors are mated. Do not apply a load to the
cable in excess of the values indicated in the diagram below.
(3) Precautions
Do NOT forcefully twist or deform wires.
