2.3.9

MISO

Master in slave out: data from the MCU are encoded using the BMC and then transmitted via the STUSB1602 to

the connected CC line driver. Data are sampled by the STUSB1602 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 STUSB1602. 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.

2.3.11

SCLK

The serial clock signal from the STUSB1602 drives the SPI/MSP interface of the MCU and the clock data on the

MISO and MOSI pins.

2.3.12

A_B_SIDE

This output pin provides cable orientation. It is used to establish USB SuperSpeed signal routing. The cable

orientation is also provided by an internal I²C register. This signal is not required if no data support or USB 2.0

supports only.

Value

CC pin position

HiZ

CC1 pin is attached to CC line

0

CC2 pin is attached to CC line

2.3.13

VBUS_SENSE

receptacle side.

2.3.14

VBUS_EN_SNK

In sink power role, this pin allows the incoming VBUS power to be enabled when the connection to a source is

established and VBUS is in a valid operating range. The open drain output allows a PMOS transistor to be directly

driven. The logic value of the pin is also advertised in a dedicated I²C register bit.

2.3.15

VBUS_EN_SRC

driven. The logic value of the pin is also advertised in a dedicated I²C register bit.

2.3.16

VREG_1V2

This pin is used only for external decoupling of 1.2 V internal regulator. The recommended decoupling capacitor

is: 1 µF typ. (0.5 µF min.; 10 µF max.).

2.3.17

VSYS

This is the low power supply of the system, if there is any. It can be connected directly to a system power supply

delivering 3.3 V or 5 V. It is recommended to connect this pin to ground when it is not used.

2.3.18

VREG_2V7

This pin is used for external decoupling of the 2.7 V internal regulator. The recommended decoupling capacitor is:

1 µF typ. (0.5 µF min., 10 µF max.).

STUSB1602

Pin description

DS11254 - Rev 5

page 6/39