Q
How do the fault diagnostics work?
A
The voltages on the input channels of the ADG5248F are continuously monitoredand the state of the switch is indicated by an active low digital output pin,
FF. A HI signal (>2V) indicates “no fault” condition and a LO signal (<0.8V)
indicates an overvoltage has occurred on any of the input channels.
Once a fault has been detected, the SF pin can then be used to determine which
specific channel is in fault. The SF pin is also an active low digital output
pin. The F0, F1, and F2 digital input pins are used as decoder pins.
The user cycles through all 8 combinations of (F2, F1, F0) and monitors the SF
pin to diagnose which of the 8 input channels is in fault.
