The next Bridge device we are going to discuss is the SC18IM700. This is a I²C controller with UART host interface. This device requires very little software to control it, and it can be used to send and receive data to and from any I²C slave devices. The device receives command sequence from host in hex through the UART port, translate the hex commands to actual I2C electrical signals that are used to send and receives data to and from an I2C device. The device has an internal oscillator; therefore, no external crystal is needed. These are the major features of this Bridge. It sends and receive data and commands from the host through the UART port. Only two pins are needed here: TX and RX. The baud rate is default to 9600 bps after reset, but the baud rate can be changed by the host by writing to the bridge internal baud rate generator registers. Up to 460.8Kbps is supported. Any I2C slave device that are connected to the Bridge’s I2C bus can be controlled by the host, and I2C speeds up to 400Kbps can be supported. The device buffers the commands from host in its FIFO; it then send the commands through its I2C bus to the slave device. The device also receives data from I2C slave device through its I2C bus, buffer the data in its receive FIFO then sends the data to the host automatically. Because of this automatic feature, no interrupt mechanism is supported by this device. In addition, the device also provides 8 general purpose GPIO pins. These pins can be set to input, output, open-drain, quasi-bidirectional (input and output). These GPIO pins are 5V tolerance. In the case of low power application, the device support power down mode. In this mode the device draws less than 10uA. Once it is in sleep mode, it can be wake up by the toggling the WAKEUP pin from high to low.