FM3570MT20X ,4/5-Bit Multiplexed 1-Bit Latched Port with Standard 2-Wire Bus Interface & Non-Volatile LatchesGeneral Descriptionsupports both 100kbit and 400kbit modes of operation. The portThe Fairchild FM35 ..
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FM3570MT20X
4/5-Bit Multiplexed 1-Bit Latched Port with Standard 2-Wire Bus Interface & Non-Volatile Latches
FM3570 CPU CONFIGURATION CONTROLLER Register/Multiplexer for Microprocessor VID Preliminary March 2001 FM3570 CPU CONFIGURATION CONTROLLER Register/Multiplexer for Microprocessor VID The serial port is an IIC compatible slave-only interface and General Description supports both 100kbit and 400kbit modes of operation. The port The Fairchild FM3570 replaces the CPU motherboard’s configu- is used to read the I-Port, write data to the internal non-volatile ration switches with an electronic implementation consisting of a registers and select whether the I-port or one of the internal non- 4/5-bit multiplexed, 1-bit latched port, standard 2-wire bus inter- volatile registers is output to the Y-port. The FM3570 is fabricated face, and non-volatile latches. with advanced CMOS technology to achieve high density and low power operation. The FM3570 multiplexes the I-port input signals with two internal non-volatile registers that can be loaded through the serial port. Features 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 � Extended Operating Voltage Range 3.0V-5.5V port to accommodate connections to open-drain outputs and to � IIC Compatible Slave Interface. eliminate the need for external resistors. The device has open- � ESD performance: Human body model > 2000V drain outputs for easy interface to devices with different V DD levels. � Choice of 2.5V Outputs or Open-Drain Outputs Block Diagram Non_Mux_Out I[4:0] Y[4:0] Mux1 SOPRA Mux2 SOPRB MXSB, MXSA IIC Read Logic Mux3 MUXSEL Control Logic OVRD SDA Shift Slave Address IIC Register Register Interface SCL ASEL Comparator Start/Stop Logic 1 © 2001 FM3570 Rev. A
