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CAT24AA04WI-GT10 数据表(PDF) 4 Page - ON Semiconductor

部件名 CAT24AA04WI-GT10
功能描述  4-Kb and 8-Kb I2C CMOS Serial EEPROM
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制造商  ONSEMI [ON Semiconductor]
网页  http://www.onsemi.com
标志 ONSEMI - ON Semiconductor

CAT24AA04WI-GT10 数据表(HTML) 4 Page - ON Semiconductor

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CAT24AA04, CAT24AA08
http://onsemi.com
4
Power−On Reset (POR)
Each CAT24AA04/08 incorporates Power−On Reset
(POR) circuitry which protects the internal logic against
powering up in the wrong state. The device will power up
into Standby mode after VCC exceeds the POR trigger level
and will power down into Reset mode when VCC drops
below the POR trigger level.
This bi−directional POR behavior protects the device
against brown−out failure, following a temporary loss of
power.
Pin Description
SCL: The Serial Clock input pin accepts the clock signal
generated by the Master.
SDA: The Serial Data I/O pin accepts input data and delivers
output data. In transmit mode, this pin is open drain. Data is
acquired on the positive edge, and delivered on the negative
edge of SCL.
WP: When the Write Protect input pin is forced HIGH by an
external source, all write operations are inhibited. When the
pin is not driven by an external source, it is pulled LOW
internally.
Functional Description
The CAT24AA04/08 supports the Inter−Integrated
Circuit (I2C) Bus protocol. The protocol relies on the use of
a Master device, which provides the clock and directs bus
traffic, and Slave devices which execute requests. The
CAT24AA04/08 operates as a Slave device. Both Master
and Slave can transmit or receive, but only the Master can
assign those roles.
I2C Bus Protocol
The 2−wire I2C bus consists of two lines, SCL and SDA,
connected to the VCC supply via pull−up resistors. The
Master provides the clock to the SCL line, and the Master
and Slaves drive the SDA line. A ‘0’ is transmitted by
pulling a line LOW and a ‘1’ by releasing it HIGH. Data
transfer may be initiated only when the bus is not busy (see
A.C. Characteristics). During data transfer, SDA must
remain stable while SCL is HIGH.
START/STOP Condition
An SDA transition while SCL is HIGH creates a START
or STOP condition (Figure 2). A START is generated by a
HIGH to LOW transition, while a STOP is generated by a
LOW to HIGH transition. The START acts like a wake−up
call. Absent a START, no Slave will respond to the Master.
The STOP completes all commands.
Device Addressing
The Master addresses a Slave by creating a START
condition and then broadcasting an 8−bit Slave address
(Figure 3). The four most significant bits of the Slave
address are 1010 (Ah). The next three bits from the Slave
address byte are assigned as shown in Figure 3, where a9 and
a8 are internal address bits.The last bit, R/W, instructs the
Slave to either provide (1) or accept (0) data, i.e. it specifies
a Read (1) or a Write (0) operation.
Acknowledge
During the 9th clock cycle following every byte sent onto
the bus, the transmitter releases the SDA line, allowing the
receiver to respond. The receiver then either acknowledges
(ACK) by pulling SDA LOW, or does not acknowledge
(NoACK) by letting SDA stay HIGH (Figure 4). Bus timing
is illustrated in Figure 5.
Figure 2. Start/Stop Timing
START
CONDITION
STOP
CONDITION
SDA
SCL
Figure 3. Slave Address Bits
101000
a8
R/W
CAT24AA04
10100
a9 a8
R/W
CAT24AA08


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