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Application background I2C (Integrated Circuit Bus Inter): is the Philips company launched the serial bus standard (for the second tier system). Bus expansion of external devices and peripherals interface addressable through a bus, have high bus arbitration and low-speed device synchronization and other functions of high performance multi host bus. System has the advantages of simple structure, small occupied space, chip tube less number of feet, without the chip select signal, low prices. It allows a number of compatible devices to share bus and is widely used.. The bus length can reach 7.6m, the transmission speed can reach 400kbps, the standard rate is 100kbps. Support for multiple components. Supports multi master devices (only one master device at a time). SDA, the SCL pin for all devices on the I2C bus must be externally connected with the pull resistor. Wide application prospect Key Technology in practical application,
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