ATSGA204A View Datasheet(PDF) - Microchip Technology
Part Name
Description
MFG CO.
'ATSGA204A' PDF : 93 Pages View PDF
Figure 6-1. Data Bit Transfer on I2C Interface
ATSHA204A
I2C Interface
SDA
SCL
Data Line
Stable;
Data Valid
Change
of Data
Allowed
• Start Condition: a high-to-low transition of SDA with SCL high is a Start condition, which must
precede all commands.
• Stop Condition: 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. Microchip recommends that a Stop condition be sent after any packet is sent to the
device although it may not always be required. The device starts when the correct number of bytes
is received. In the case of an error on the bus, the device resets on the watchdog timer.
Figure 6-2. Start and Stop Conditions on I2C Interface
SDA
SCL
S
P
Start
Condition
Stop
Condition
• Acknowledge (ACK): on the ninth clock cycle after every address or data byte has been
transferred, the receiver pulls 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
has been 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.
© 2018 Microchip Technology Inc.
DS40002025A-page 29
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