FM3540

The FM3540/60 multiplexes the I-port input signals with two internal non-volatile registers that can be loaded through the serial port. The multiplexer is selected via the serial port and defaults to the I-Port upon power-up. Pull-up resistors are provided on the input port to accommodate connections to open drain outputs and to eliminate the need for external resistors. The FM3540/60 supports a choice of either 2.5V output or Open Drain Outputs for easy interface to devices with different VDD Levels.

The serial port is an IIC compatible slave only interface and supports both 100kbits and 400kbits modes of operation. The FM3540/60 is used to read the I-Port, Write Data to the internal non-volatile registers and select whether the I-Port or one of the internal nonvolatile registers is output to the Y-port. The FM3540/60 is fabricated with an advanced CMOS technology to achieve high density and low power.