Datasheet

10
dc1840afa
DEMO MANUAL DC1840A
Demonstration circuit 1680a operation
Figure 13. DC1680A Address Switch, Pushbutton Switches, INT LED, and Port Power LEDs
Interrupt LED
A red LED indicates when the INT line is pulled logic low
by the daughter card. When the interrupt is cleared (high)
via I
2
C servicing, the LED is turned off.
Port 1 Through 12 Power LED Indicators
Each PSE port has a green LED indicator to show when
PoE power is present at the port. The LEDs are driven by
the respective port OUT voltage.
DC1680A System Setup
Figure 14 shows a basic DC1680A system setup. The
DC1682A daughter card is inserted in the 34-pin connec-
tor J1. A power supply is connected to V
EE
with banana
cables. The DC590 connects with 14-pin ribbon cable
to the DC1680A and to a PC via USB. On the PC a GUI
communicates with the board. At the PSE output, PDs are
connected. A sample PD demo board is shown in Figure 14.