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CAT1024YI-30-GT3 Datenblatt(PDF) 9 Page - ON Semiconductor

Teilenummer CAT1024YI-30-GT3
Bauteilbeschribung  Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM and Manual Reset
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CAT1024, CAT1025
© 2009 SCILLC. All rights reserved.
9
Doc. No. MD-3008 Rev. R
Characteristics subject to change without notice
EMBEDDED EEPROM OPERATION
The CAT1024 and CAT1025 feature a 2-kbit embedded
serial EEPROM that supports the I
2C Bus data
transmission protocol. This Inter-Integrated Circuit Bus
protocol defines any device that sends data to the bus to
be a transmitter and any device receiving data to be a
receiver. The transfer is controlled by the Master device
which generates the serial clock and all START and
STOP conditions for bus access. Both the Master device
and Slave device can operate as either transmitter
or receiver, but the Master device controls which mode
is activated.
I
2C BUS PROTOCOL
The features of the I
2C bus protocol are defined as
follows:
(1) Data transfer may be initiated only when the bus
is not busy.
(2) During a data transfer, the data line must remain
stable whenever the clock line is high. Any
changes in the data line while the clock line is
high will be interpreted as a START or STOP
condition.
START CONDITION
The START Condition precedes all commands to the
device, and is defined as a HIGH to LOW transition of
SDA when SCL is HIGH. The CAT1024/25 monitors
the SDA and SCL lines and will not respond until this
condition is met.
STOP CONDITION
A LOW to HIGH transition of SDA when SCL is HIGH
determines the STOP condition. All operations must
end with a STOP condition.
DEVICE ADDRESSING
The Master begins a transmission by sending a
START condition. The Master sends the address of
the particular slave device it is requesting. The four
most significant bits of the 8-bit slave address are
programmable in metal and the default is 1010.
The last bit of the slave address specifies whether a
Read or Write operation is to be performed. When this
bit is set to 1, a Read operation is selected, and when
set to 0, a Write operation is selected.
After the Master sends a START condition and the
slave address byte, the CAT1024/25 monitors the bus
and responds with an acknowledge (on the SDA line)
when its address matches the transmitted slave
address. The CAT1024/25 then perform a Read or
Write operation depending on the R/W
¯¯ bit.
Figure 3. Bus Timing
Figure 4. Write Cycle Timing
tHIGH
SCL
SDA IN
SDA OUT
tLOW
tF
tLOW
tR
tBUF
tSU:STO
tSU:DAT
tHD:DAT
tHD:STA
tSU:STA
tAA
tDH
tWR
STOP
CONDITION
START
CONDITION
ADDRESS
ACK
8TH BIT
BYTE n
SCL
SDA


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