STUSB1602 datasheet(9/55 Pages) STMICROELECTRONICS

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DocID028319 Rev 2

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STUSB1602

Inputs/outputs

2.3.4

RESET

Active high reset

2.3.5

I²C interface pins

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 STUSB1602 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 STUSB1602 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 STUSB1602 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 STUSB1602. 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 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.

Table 4. I2C interface pin 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)

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