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PCA8885 Datasheet(PDF) 2 Page - NXP Semiconductors |
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PCA8885 Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 8 page I2C-bus: The serial revolution By replacing complex parallel interfaces with a straightforward yet powerful serial structure, the I2C-bus revolutionized chip-to-chip communications. Invented by NXP (Philips) more than 30 years ago, the I2C-bus uses a simple two-wire format to carry data one bit at a time. It performs inter-chip addressing, selection, control, and data transfer. Speeds are up to 400 kHz (Fast-mode), 1 MHz (Fast-mode Plus), 3.4 MHz (High Speed-mode), or 5 MHz (Ultra Fast-mode). The I2C-bus shrinks the IC footprint and leads to lower IC costs. Plus, since far fewer copper traces are needed, it enables a smaller PCB, reduces design complexity, and lowers system cost. SDA SCL uC A0 A1 1010A2A1A0R/W A2 New function address 1010011 R/W New function address as assigned New function MCU MCU RTC LCD I/O A/D D/A I2C-bus devices are available in a wide range of functions. Each slave device has its own I2C-bus address, selectable using address pins set high (1) or low (0). Information is transmitted byte by byte, and each byte is acknowledged by the receiver. There can be multiple devices on the same bus, and more than one IC can act as master. The master role is typically played by a microcontroller. Parallel Interface I2C Serial Interface Master Write data Slave SDA SCL transmitter P W S data slave address data A A A receiver SDA SCL transmitter receiver Read data P R S data slave address data A A A < n data bytes > last data byte S = Start condition R/W = read/write A = Acknowledge A = Not acknowledge P = Stop condition The master always sends the clock < n data > bytes |
Similar Part No. - PCA8885 |
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Similar Description - PCA8885 |
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