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STMPE610QTR bảng dữ liệu(PDF) 9 Page - STMicroelectronics |
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STMPE610QTR bảng dữ liệu(HTML) 9 Page - STMicroelectronics |
9 / 56 page STMPE610 I2C interface Doc ID 15432 Rev 3 9/56 4.1 I2C features The features that are supported by the I2C interface are listed below: ● I2C slave device ● Operates at 1.8 V ● Compliant to Philips I2C 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 I2C 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. Table 7. I2C timing Symbol Parameter Min Typ Max Unit fSCL SCL clock frequency 0 − 400 kHz tLOW Clock low period 1.3 −− µs tHIGH Clock high period 600 −− ns tF SDA and SCL fall time −− 300 ns tHD:STA START condition hold time (after this period the first clock is generated) 600 −− ns tSU:STA START condition setup time (only relevant for a repeated start period) 600 −− ns tSU:DAT Data setup time 100 −− ns tHD:DAT Data hold time 0 −− µs tSU:STO STOP condition setup time 600 −− ns tBUF Time the bus must be free before a new transmission can start 1.3 −− µs |
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