STUSB1600 datasheet(22/69 Pages) STMICROELECTRONICS

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Features description

STUSB1600

22/69

DocID028937 Rev 1

3.8.2

Debug accessory mode detection

The STUSB1600 detects a connection to a debug and test system (DTS) when it operates

either in sink power role or in source power role. The debug accessory detection is

advertised by the DEBUG1 and DEBUG2 pins as well as through the

CC_ATTACHED_MODE bits of the I2C register CC_CONNECTION_STATUS (see

Section 5.1: Register description).

•

In sink power role, a debug accessory device is detected when both the CC1 and CC2

pins are pulled up by an Rp resistor from the connected device. The voltage levels on

the CC1 and CC2 pins give the orientation and current capability as described in the

table below. The DEBUG1 pin is asserted to advertise the DTS detection and the

A_B_SIDE pin indicates the orientation of the connection. The current capability of the

DTS is given through the SINK_POWER_STATE bits of the I2C register

CC_OPERATION_STATUS (see Section 5.1: Register description).

Table 10. Orientation and current capability detection in sink power role

CC1 pin

(CC2 pin)

CC2 pin

(CC1 pin)

Charging

current

configuration

A_B_SIDE pin

CC1/CC2

(CC2/CC1)

Current capability state

SINK_POWER_STATE

bit values

Rp 3A

Rp 1.5A

Default

HiZ (0)

PowerDefault.SNK (source

supplies default USB

current)

Rp 1.5A

Rp default

1.5 A

HiZ (0)

Power1.5.SNK (source

supplies 1.5 A USB Type-C

current)

Rp 3A

Rp default

3.0 A

HiZ (0)

Power3.0.SNK (source

supplies 3.0 A USB Type-C

current)

def/1.5A/3A

Default

HiZ (HiZ)

PowerDefault.SNK (source

supplies default USB

current)

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