AN18208A Ver la hoja de datos (PDF) - Panasonic Corporation
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AN18208A Datasheet PDF : 37 Pages
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AN18208A
Technical Data
y I2C-bus interface
1. Basic Rules
x This IC, I2C-bus, is designed to correspond to the Standard-mode (100 kbps) and Fast-mode(400 kbps) devices in the version
2.1 of Philips Co.'s specification. However, it does not correspond to the HS-mode (to 3.4 Mbps).
x This IC will be operated as a slave device in the I2C-bus system.
x The program operation check of this IC has not been conducted on the multi-master bus system and the mix-speed bus system,
yet. The connected confirmation of this IC to the CBUS receiver also has not been checked. Please confirm our company if it
will be used in these mode systems.
x Purchase of Panasonic I2C Components conveys a license under the Philips I2C patent right to use these components in an I2C
systems, provided that the system conforms to the I2C standard specifications as defined by Philips.
2. START and STOP conditions
A High to Low transition on the SDA line while SCL is High is one such unique case. This situation indicates a START
condition. A Low to High transition on the SDA line while SCL is High defines a STOP condition.
START and STOP conditions are always generated by the master. After START condition occur, the bus will be busy.
The bus is considered to be free again a certain time after the STOP condition.
START condition
STOP condition
SDA
SCL
3. Transferring Data
Every byte put on the SDA line must be 8-bits long. The number of bytes that can be transmitted per transfer is unrestricted.
Each byte has to be followed by an acknowledge bit. Data is transferred with the most significant bit (MSB) first.
SDA
MSB
S
SCL
or
1
2
Sr
START or
repeated START
condition
acknowledgement
signal from slave
P
acknowledgement
Sr
signal from receiver
7
89
ACK
SDC00079AEB
Sr
1
2
3–8
9
or
P
ACK
STOP or
repeated START
condition
16
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