I2C-BUS_UM10204.pdf

I2C-bus specification and user manual。UM10204。 Philips Semiconductors (now NXP Semiconductors) developed a simple bidirectional 2-wire bus for efficient inter-IC control. This bus is called the Inter-IC or I2C-bus. Only two bus lines are required: a serial data line (SDA) and a serial clock line (SCL). Serial, 8-bit oriented, bidirectional data transfers can be made at up to 100kbit/s in the Standard-mode, up to 400kbit/s in the Fast-mode, up to 1Mbit/s in the Fast-mode Plus (Fm+), or up to 3.4Mbit/s in the High-speed mode. The Ultra Fast-mode is a uni-directional mode with data transfers of up to 5Mbit/s.