FUSB302T datasheet(7/36 Pages) ONSEMI

7 / 36 page

Manual Host Detection and Configuration

When the FUSB302T 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 FUSB302T 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 FUSB302T automatically

indicates the programmed current capability when a

device is attached. If the current capabilities are changed

after a device is attached, the FUSB302T immediately

changes the CC line to the programmed capability.

Figure 6.

HOST_CUR Changed After Attach

Figure 7.

HOST_CUR Changed Prior To Attach

The Type-C specification outlines different attach and

detach thresholds for a Type-C host that are based on

how much current is supplied to each CC pin. Based on

the programmed HOST_CUR setting, the software

adjusts the DAC comparator threshold to match the

Type-C

specification

requirements.

The

BC_LVL

comparators can also be used as part of the Ra

detection flow. This is summarized in Table 3.

Table 3.

Host Interrupt Summary

Termination

HOST_CUR[1:0]

Interrupt Status

Attach/Detach

BC_LVL[1:0]

COMP

COMP Setting

2'b01

2'b00

2'b10

2'b01

6'b00_1010 (0.42 V)

2'b11

2'b10

6'b01_0011 (0.8 V)

2'b01, 2'b10

6'b10_0110 (1.6 V)

Attach

6'b10_0110 (1.6 V)

Detach

2'b11

6'b11_1110 (2.6 V)

Attach

6'b11_1110 (2.6 V)

Detach

HOST_CUR[1:0] = DEFAULT

HIGH CURRENT SETTING

MED CURRENT SETTING

ATTACH

HIGH CURRENT SETTING

MED CURRENT SETTING

ATTACH

DEFAULT CURRENT

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