2.3.2

CC1GND / CC2GND

CC1GND and CC2GND are used as a reference to ground and must be connected to ground.

2.3.3

VCONN

This power input is connected to a power source that can be a 5 V power supply. It is used to provide power to

the local plug. It is internally connected to power switches that are protected against short-circuit and overvoltage.

This does not require any protection on the input side. When a valid source-to-sink connection is determined and

the VCONN power switches are enabled, VCONN is provided by the source to the unused CC pin (see Section

3.4 VCONN supply).

2.3.4

RESET

Active high reset.

2.3.5

I²C interface pins

Table 3. I²C interface pins list

Name

Description

SCL

I²C clock – need external pull-up

SDA

I²C data – need external pull-up

ALERT#

I²C interrupt – need external pull-up

ADDR0

I²C device address bit (see Section 5 I²C interface)

2.3.6

GND

Ground.

2.3.7

MOSI

Master out slave in: data from the connected CC line are decoded using the BMC and then transmitted via the

STUSB1702 to the MCU. Data are valid on the falling edge of the SCLK line and must be sampled by the MCU on

this edge.

2.3.8

NSS

The chip select signal is driven by the STUSB1702 and is connected to the MCU. It activates the SPI/MSP

interface transfer. The NSS signal drives the MCU so that:

•

When TX_EN is asserted (TX mode), the STUSB1702 transmits data from the MCU over the CC line. Note,

the MCU must provide data to be encoded on the MISO line which must be in synchrony with the SCLK

•

When TX_EN is not asserted (RX mode, default), the CC line is activity detected, data are received, and the

BMC is decoded by the STUSB1702. Decoded data are sent on the MOSI line in synchrony with the SCLK

2.3.9

MISO

Master in slave out: data from the MCU are encoded using the BMC and then transmitted via the STUSB1702 to

the connected CC line driver. Data are sampled by the STUSB1702 on the rising edge of the SCLK line and must

be stable on this edge.

2.3.10

TX_EN

TX_EN is a control signal from the MCU to the STUSB1702. It enables the BMC control logic that transfers data

from the MCU serial interface, encodes it in BMC format, and drives the connected CC line.

Note:

TX mode overrides RX mode.

STUSB1702

Pin description

DS12664 - Rev 1

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