FUSB302BMPX datasheet(7/32 Pages) ONSEMI

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FUSB302B

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Table 4. PROCESSOR CONFIGURES THE

FUSB302B THROUGH I2C

I2C Registers/Bits

Value

TOGGLE

PWR

07H

HOST_CUR0

HOST_CUR1

MEAS_VBUS

VCONN_CC1

VCONN_CC2

Mask Register

0xFE

Maska Register

0xBF

Maskb Register

(Except I_TOGDONE and I_BC_LVL Interrupt)

0x01

PWR[3:0]

0xBF

1. Once it has been determined what the role is of the FUSB302B,

it returns I_TOGDONE and TOGSS1/2.

2. Processor then can perform a final manual check through I2C.

Manual Device Toggle

The FUSB302B has the capability to do manual DRP

toggle. In manual toggle the FUSB302B is configurable by

the processor software by I2C and setting TOGGLE = 0.

Manual Device Detection and Configuration

A Type-C device must monitor VBUS to determine if it is

attached or detached. The FUSB302B provides this

information through the VBUSOK interrupt. After the

Type-C device knows that a Type-C host has been attached,

it needs to determine what type of termination is applied to

each CC pin. The software determines if an Ra or Rd

termination is present based on the BC_LVL and COMP

interrupt and status bits.

Additionally, for Rd terminations, the software can

further determine what charging current is allowed by the

Type-C host by reading the BC_LVL status bits. This is

summarized in Table 5.

Toggle Functionality

When TOGGLE bit (Control2 register) is set the

FUSB302B implements a fixed DRP toggle between

presenting as a SRC and as a SNK. It can also be configured

to present as a SRC only or SNK only and poll CC1 and CC2

continuously. This operation is turned on with TOGGLE = 1

and the processor should initially write HOST_CUR1 = 0,

HOST_CUR0 = 1 (for default current), VCONN_CC1 =

VCONN_CC2 = 0,

Mask

Maska

0x01. The processor should also read the interrupt register

to clear them prior to setting the TOGGLE bit.

Table 5. DEVICE INTERRUPT SUMMARY

Status Type

Interrupt Status

Meaning

BC_LVL[1:0]

COMP

COMP Setting

VBUSOK

CC Detection

2’b00

vRA

2’b01

vRd−Connect and vRd−USB

2’b10

vRd−Connect and vRd−1.5

2’b11

6’b11_0100

(2.05 V)

vRd−Connect and vRd−3.0

Attach

Host Attached, VBUS Valid

Detach

Host Detached, VBUS Invalid

The high level software flow diagram for a Type-C device

(SNK) is shown in Figure 7.

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