ATSHA204A datasheet(30/93 Pages) MICROCHIP

30 / 93 page

Figure 6-3. NACK and ACK Conditions on I2C Interface

Data Output

by Receiver

SCL from

Master

Data Output

by Transmitter

Clock Pulse for

Acknowledgment

Start

Condition

Not Acknowledge

Acknowledge

Multiple ATSHA204A devices can share the same I2C interface if the I2C_Address byte is programmed

differently for each device on the bus. Because six of the bits of the device address are programmable,

the ATSHA204A can also share the I2C interface with any standard I2C device, including any serial

EEPROM. Bit 3 (also known as TTL Enable) must be programmed according to the input thresholds

desired and it is fixed in a particular application.

6.2

I2C Transmission to the ATSHA204A Device

The transmission of data from the system to the ATSHA204A is summarized in the figure below. The

order of transmission is as follows:

Start Condition

Device Address Byte

Word Address Byte

Optional Data Bytes (1 through N)

Stop Condition

Figure 6-4. Normal I2C Transmission to an ATSHA204A

1-7

SCL

SDA

R/W

ACK1

Word

Address

Data 1

ACK1

Data 2

Start

Condition

Stop

Condition

Device

Address

ACK1

Data N

Note: SDA is driven low by the ATSHA204A during the ACK periods

The following table labels the bytes of the I/O transaction. The I2C name column provides the names of

the bytes as they are described in the AT24C16 Datasheet.

Table 6-1. I2C Transmission to the ATSHA204A

ATSHA204A

I2C Name

Direction Description

Device Address

Device

Address

To Slave

This byte selects a particular device on the I2C interface. The

ATSHA204A is selected if bits 1 through 7 of this byte match bits 1 thru

ATSHA204A

I2C Interface

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