UPSD3313D-40T6 datasheet(95/231 Pages) STMICROELECTRONICS

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uPSD33xx

I2C INTERFACE

uPSD33xx devices support one serial I2C inter-

face. This is a two-wire communication channel,

having a bi-directional data signal (SDA, pin P3.6)

and a clock signal (SCL, pin P3.7) based on open-

drain line drivers, requiring external pull-up resis-

tors, RP, each with a typical value of 4.7kΩ (see

Figure 38).

I2C Interface Main Features

Byte-wide data is transferred, MSB first, between

a Master device and a Slave device on two wires.

More than one bus Master is allowed, but only one

Master may control the bus at any given time. Data

is not lost when another Master requests the use

of a busy bus because I2C supports collision de-

tection and arbitration. The bus Master initiates all

data movement and generates the clock that per-

mits the transfer. Once a transfer is initiated by the

Master, any device addressed is considered a

Slave. Automatic clock synchronization allows I2C

devices with different bit rates to communicate on

the same physical bus. A single device can play

the role of Master or Slave, or a single device can

be a Slave only. Each Slave device on the bus has

a unique address, and a general broadcast ad-

dress is also available. A Master or Slave device

has the ability to suspend data transfers if the de-

vice needs more time to transmit or receive data.

This I2C interface has the following features:

–

Serial I/O Engine (SIOE): serial/parallel

conversion; bus arbitration; clock generation

and synchronization; and handshaking are all

performed in hardware

–

Interrupt or Polled operation

–

Multi-master capability

–

7-bit Addressing

–

Supports standard speed I2C (SCL up to

100kHz), fast mode I2C (101KHz to 400kHz),

and high-speed mode I2C (401KHz to

833kHz)

Figure 38. Typical I2C Bus Configuration

Note: 1. For 3.3V system, connect RP to 3.3V VCC. For 5.0V system, connect RP to 5.0V VDD.

I2C BUS

SDA

SCL

VCC or VDD

(1)

Device with I2C

Interface

Device with I2C

Interface

SDA/P3.6

SCL/P3.7

uPSD33XX(V)

Device with I2C

Interface

AI09623

UPSD3313D-40T6 Datasheet(PDF) 95 Page - STMicroelectronics

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