FUSB302MPX. datasheet(6/35 Pages) ONSEMI

6 / 35 page

www.fairchildsemi.com

FUSB302

• Rev. 2

www.onsemi.com

Table 1.

Processor Configures the FUSB302

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]

0x07

Notes:

Once it has been determined what the role is of the

FUSB302, it returns I_TOGDONE and TOGSS1/2.

Processor then can perform a final manual check

through I2C.

Manual Device Toggle

The FUSB302 has the capability to do manual DRP

toggle. In manual toggle the FUSB302 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 FUSB302 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 2.

Toggle Functionality

When TOGGLE bit (Control2 register) is set the

FUSB302 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

and

Maskb

also read the interrupt register to clear them prior to

setting the TOGGLE bit.

Table 2.

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

(2.226 V)

vRd-Connect and vRd-3.0

Attach

Host Attached, VBUS Valid

Detach

Host Detached, VBUS Invalid

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