DC757A-A

DC757A-A demonstration circuit features the LTC43021-1, an addressable 2-wire I²C bus and SMBus compatible bus buffer. The LTC4302-1 allows a peripheral board to be inserted and removed from a live backplane without corruption of the bus. The LTC4302-1 maintains electrical isolation between the backplane and peripheral board until their VCC supply is valid and a host device on the backplane side addresses the LTC4302-1 commands them to connect. The ADDRESS pin provides 32 possible addresses set by an external resistive divider between VCC and GND. The LTC4302-1 works with supply voltages ranging from 2.7V to 5.5V. The SDA and SCL inputs and outputs do not load the bus lines when VCC is low. Rise time accelerator circuitry allows for heavier capacitive bus loading while still meeting system timing requirements. During insertion, the SDA and SCL lines are precharged to 1V to minimize bus disturbances.

• Part of QuickEval systems which allows for quick and easy evaluation of LTC4302-1 with s/w interface