ATSHA204 datasheet(22/65 Pages) ATMEL

22 / 65 page

Atmel ATSHA204 [DATASHEET]

8740D

−CRYPTO−3/12

Start:

A high-to-low transition of SDA with SCL high is a start condition, which must precede all commands.

Stop:

A low-to-high transition of SDA with SCL high is a stop condition. After this condition is received by the

device, the current I/O transaction ends. On input, if the device has sufficient bytes to execute a command,

the device transitions to the busy state and begins execution. The stop condition should always be sent after

any packet sent to the device.

Figure 6-2.

Start and Stop Conditions on I

2C Interface

SDA

SCL

Start

Condition

Stop

Condition

Acknowledge (ACK): On the ninth clock cycle after every address or data byte is transferred, the receiver will pull the

SDA pin low to acknowledge proper reception of the byte.

Not Acknowledge (NACK): Alternatively, on the ninth clock cycle after every address or data byte is transferred, the

receiver can leave the SDA pin high to indicate that there was a problem with the reception of the byte or

that this byte completes the block transfer.

Figure 6-3.

NACK and ACK Conditions on I

2C Interface

Data Output

by Transmitter

Data Output

by Receiver

Clock Pulse for

Acknowledgement

Start

Condition

SCL from

Master

Not Acknowledge

Acknowledge

Multiple ATSHA204 devices can easily share the same I

2C interface if the I2C_Device address byte is programmed differently

for each device on the bus. Because six of the bits of the device address are programmable, the ATSHA204 can also share

the I

2C interface with any standard I2C device, including any serial EEPROM. Bit 3 (also known as TTL Enable) must be

programmed according the input thresholds desired, and is fixed in a particular application.

ATSHA204 Datasheet(PDF) 22 Page - ATMEL Corporation

ATSHA204 Datasheet(HTML) 22 Page - ATMEL Corporation

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