LTC3220 datasheet(14/20 Pages) LINER

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LTC3220/LTC3220-1

32201fb

Bus Speed

The I2C port is designed to be operated at speeds up to

400kHz. It has built-in timing delays to ensure correct

operation when addressed from an I2C compliant master

device. It also contains input ﬁlters designed to suppress

glitches should the bus become corrupted.

Start and Stop Conditions

A bus-master signals the beginning of a communication

to a slave device by transmitting a Start condition.

A Start condition is generated by transitioning SDA from

high to low while SCL is high. When the master has

ﬁnished communicating with the slave, it issues a Stop

condition by transitioning SDA from low to high while

SCL is high. The bus is then free for communication with

another I2C device.

Byte Format

Each byte sent to the LTC3220/LTC3220-1 must be 8 bits

long followed by an extra clock cycle for the Acknowledge

bit to be returned by the LTC3220/LTC3220-1. The data

should be sent to the LTC3220/LTC3220-1 most signiﬁcant

bit (MSB) ﬁrst.

OPERATION

Acknowledge

The Acknowledge signal is used for handshaking between

the master and the slave. An Acknowledge (active low)

generated by the slave (LTC3220/LTC3220-1) lets the mas-

ter know that the latest byte of information was received.

The Acknowledge related clock pulse is generated by the

master. The master releases the SDA line (high) during

the Acknowledge clock cycle. The slave-receiver must pull

down the SDA line during the Acknowledge clock pulse

so that it remains a stable low during the high period of

this clock pulse.

Slave Address

Each version of LTC3220/LTC3220-1 responds to a unique

address which has been factory programmed (Table 1).

The eighth bit of the address byte (R/W) must be 0 for the

LTC3220/LTC3220-1 to recognize the address since it is a

write only device. This effectively forces the address to be

8 bits long where the least signiﬁcant bit of the address

is 0. If the correct seven bit address is given but the R/W

bit is 1, the LTC3220/LTC3220-1 will not respond.

Table 1. LTC3220/LTC3220-1 Factory Programmed Slave

Address

PART NUMBER

SLAVE ADDRESS

LTC3220

0011100

LTC3220-1

0011101

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