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ISL22346UFV20Z データシート(PDF) 11 Page - Intersil Corporation

部品番号 ISL22346UFV20Z
部品情報  Quad Digitally Controlled Potentiometers
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メーカー  INTERSIL [Intersil Corporation]
ホームページ  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL22346UFV20Z データシート(HTML) 11 Page - Intersil Corporation

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11
FN6177.0
July 28, 2006
All I2C interface operations must be terminated by a STOP
condition, which is a LOW to HIGH transition of SDA while
SCL is HIGH (See Figure 16). A STOP condition at the end
of a read operation, or at the end of a write operation places
the device in its standby mode.
An ACK, Acknowledge, is a software convention used to
indicate a successful data transfer. The transmitting device,
either master or slave, releases the SDA bus after
transmitting eight bits. During the ninth clock cycle, the
receiver pulls the SDA line LOW to acknowledge the
reception of the eight bits of data (See Figure 17).
The ISL22346 responds with an ACK after recognition of a
START condition followed by a valid Identification Byte, and
once again after successful receipt of an Address Byte. The
ISL22346 also responds with an ACK after receiving a Data
Byte of a write operation. The master must respond with an
ACK after receiving a Data Byte of a read operation.
A valid Identification Byte contains 1010 as the four MSBs,
and the following three bits matching the logic values
present at pins A2, A1, and A0. The LSB is the Read/Write
bit. Its value is “1” for a Read operation, and “0” for a Write
operation (See Table 3).
TABLE 3. IDENTIFICATION BYTE FORMAT
1010
A2
A1
A0
R/W
(MSB)
(LSB)
Logic values at pins A2, A1, and A0 respectively
SDA
SCL
START
DATA
DATA
STOP
STABLE
CHANGE
DATA
STABLE
FIGURE 16. VALID DATA CHANGES, START, AND STOP CONDITIONS
SDA OUTPUT FROM
TRANSMITTER
SDA OUTPUT FROM
RECEIVER
8
1
9
START
ACK
SCL FROM
MASTER
HIGH IMPEDANCE
HIGH IMPEDANCE
FIGURE 17. ACKNOWLEDGE RESPONSE FROM RECEIVER
S
T
A
R
T
S
T
O
P
IDENTIFICATION
BYTE
ADDRESS
BYTE
DATA
BYTE
A
C
K
SIGNALS FROM
THE MASTER
SIGNALS FROM
THE SLAVE
A
C
K
1
0
1
00
A
C
K
WRITE
SIGNAL AT SDA
00 0 0
A0
A1
A2
0
FIGURE 18. BYTE WRITE SEQUENCE
ISL22346


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