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TW2866C bảng dữ liệu(PDF) 47 Page - Renesas Technology Corp

tên linh kiện TW2866C
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TW2866C bảng dữ liệu(HTML) 47 Page - Renesas Technology Corp

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TW2866C
FN8253 Rev. 0.00
Page 47 of 143
February 3, 2012
Host Interface
Serial Interface
The two wire serial bus interface is used to allow an external micro-controller to write to or read from the
data through the TW2866 register. The SCLK is the serial clock and SDAT is the data line. Both lines are
pulled high by the resistors connected to VDD. The SADD[1:0] defines two LSB of the slave device address
by tying the SADD pins either to VDD or GND.
SLAVE ADDRESS
R/W
0
1
0
1
0
SADD[1]
SADD[0]
1 = Read
0 = Write
The TW2866 supports auto index increments in write/read mode if the data are in sequential order. Data
transfer rate on the bus is up to 400 Kbits/s.
MSB
LSB
MSB
LSB
MSB
LSB
Start
Slave address
R/WB
Ack
Index
Ack
Data
Ack
Stop
SDAT
SCLK
(a)
Write Mode
MSB
LSB
MSB
LSB
Start
Slave address
R/WB
Ack
Index
Ack
Stop
SDAT
SCLK
MSB
LSB
MSB
LSB
Start
Slave address
R/WB
Ack
Data
NoAck
Stop
“0”
“1”
(b)
Read Mode
FIGURE 39. TIMING CHART OF SERIAL INTERFACE



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