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STMPE811 Datasheet(PDF) 8 Page - STMicroelectronics

Part # STMPE811
Description  8-bit port expander with advanced touchscreen controller
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPE811 Datasheet(HTML) 8 Page - STMicroelectronics

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I2C interface
STMPE811
8/54
4
I2C interface
The addressing scheme of STMPE811 is designed to allow up to 2 devices to be connected
to the same I2C bus.
Figure 4.
STMPE811 I2C interface
For the bus master to communicate to the slave device, the bus master must initiate a Start
condition and be followed by the slave device address. Accompanying the slave device
adress, is a read/write bit (R/W). The bit is set to 1 for read and 0 for write operation. If a
match occurs on the slave device address, the corresponding device gives an acknowledge
on the SDA during the 9th bit time. If there is no match, it deselects itself from the bus by not
responding to the transaction.
Figure 5.
I2C timing diagram
Table 5.
I2C address
ADDR0
Address
Note
00 x 82
10 x 88
ADDR0
SCLK
SDAT
SCLK
SDAT
GND
VCC
STMPE811
AI00589
SDA
P
tSU:STO
tSU:STA
tHD:STA
SR
SCL
tSU:DAT
tF
tHD:DAT
tR
tHIGH
tLOW
tHD:STA
tBUF
S
P


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