Datasheet

I2C interface STMPE811
12/65 Doc ID 14489 Rev 6
4.1 I
2
C features
The features that are supported by the I
2
C interface are listed below:
● I
2
C slave device
● Operates at 1.8 V
● Compliant to Philips I
2
C specification version 2.1
● Supports standard (up to 100 Kbps) and fast (up to 400 Kbps) modes
Start condition
A Start condition is identified by a falling edge of SDATA while SCLK is stable at high state.
A Start condition must precede any data/command transfer. The device continuously
monitors for a Start condition and does not respond to any transaction unless one is
encountered.
Stop condition
A Stop condition is identified by a rising edge of SDATA while SCLK is stable at high state. A
Stop condition terminates communication between the slave device and the bus master. A
read command that is followed by NoAck can be followed by a Stop condition to force the
slave device into idle mode. When the slave device is in idle mode, it is ready to receive the
next I
2
C transaction. A Stop condition at the end of a write command stops the write
operation to registers.
Acknowledge bit
The acknowledge bit is used to indicate a successful byte transfer. The bus transmitter
releases the SDATA after sending eight bits of data. During the ninth bit, the receiver pulls
the SDATA low to acknowledge the receipt of the eight bits of data. The receiver may leave
the SDATA in high state if it does not acknowledge the receipt of the data.