Linear Technology DC1680A, Demo Manual

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dc1840afb
DEMO MANUAL DC1840A
Demonstration circuit 1680a operation
Figure 12. DC1680A Connections and Supply LEDs
MSD and RESET Pushbuttons
Pushbutton switch SW1, when pressed, pulls the RESET
pin of the daughter card logic low. The PSE controller is
then held inactive with all ports off and all internal registers
reset to their power-up states. When SW1 is released,
RESET is pulled high, and the PSE begins normal operation.
Pushbutton switch SW2 when pressed pulls the maskable
shutdown input ( MSD ) pin of the daughter card logic low.
When pressed, all ports that have their corresponding mask
bit set in the mconfig register of the PSE controller will be
shutdown. These ports must then be manually re-enabled
via I
2
C or by resetting the PSE.