FUSB302BMPX datasheet(8/32 Pages) ONSEMI

8 / 32 page

FUSB302B

www.onsemi.com

Figure 7. SNK Software Flow

Disabled:

FUSB302B in low power

mode looking for an attach

Unattached.SNK:

Host software enables

FUSB302B pull−downs

and measure block to

detect attach

FUSB302B I_TOGDONE

interrupt alerts host

software that something

has attached.

Attached.SNK

Host software uses FUSB302B

comparators and DAC to determine

attach orientation and port type

AudioAccessory

DebugAccessory

FUSB302B I_VBUSOK interrupt

alerts host software that an attach

has occurred

FUSB302B I_VBUSOK interrupt

alerts host software that a detach has

occurred

Host software determines that an

accessory has been attached

FUSB302B I_COMP and I_VBUSOK

interrupts alert host software that a

accessory detach has occurred

Manual Host Detection and Configuration

When the FUSB302B is configured as a Type-C host, the

software can use the status of the comparators and DAC to

determine when a Type-C device has been attached or

detached and what termination type has been attached to

each CC pin.

The FUSB302B allows the host software to change the

charging current capabilities of the port through the

HOST_CUR control bits. If the HOST_CUR bits are

changed prior to attach, the FUSB302B automatically

indicates the programmed current capability when a device

is attached. If the current capabilities are changed after

a device is attached, the FUSB302B immediately changes

the CC line to the programmed capability.

Figure 8. HOST_CUR Changed after Attach

HOST_CUR[1:0] = DEFAULT

HIGH CURRENT SETTING

MED CURRENT SETTING

0 V

ATTACH

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