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DS00001824A-page 17

USB375x

4.3

USB Mux (USB3750 Only)

The USB mux is designed to pass High Speed USB signals to the USB connector, and allows for two USB inputs to be

abled in the event of UVLO or OVLO.

The USB Mux is designed to pass USB signals from 0 to 3.3V. It is not designed to pass signals that go above 3.3V or

below ground.

FIGURE 4-6:

CHARGER DETECTION FLOW CHART (USB3751-2)

Start Chrg Detection

ChrgDetComplete = 0

Drive DP

Detect?

DCP

Detected

Exit Chrg Detection

ChrgDetComplete = 1

=1

Any UVLO or OVLO Exit Chrg Detection

SE1 Low

Current

Charger

Wait

SE1?

=1

Release and

=0

CDP

Detected

SE1 High

Current

Charger

RxHiCurr?

=1

=0

SDP

Detected

UVLO < VBUS < OVLO

Enable OVP

Switch

=0

Clear Charger

Detection

Register

Wait for DP

Low or

Disable

=1

Detect?

Drive DM

=0

=1