3
dc1880af
DEMO MANUAL DC1880A
Quick start proceDure
DC1880A is a 6-layer demonstration board. An LDO is
included to optionally derive the V
L
logic supply from
the V
DD
input supply. An LED lights up when the
IRQ
pin
signals interrupt requests.
1. Install, or update as needed, Linear Technology's
QuikEval™ evaluation software on the PC. See Using
the LTC2874 Software section for more information.
2. Connect the DC590 board to the PC with a standard
USB A/B cable.
3. Connect the DC1880A board to the DC590 board using
the 14-conductor ribbon cable supplied with the DC590
board.
4. Choose the source for the VL logic supply—the DC590,
the LDO on the DC1880A, or either if both are set to
the same voltage:
a. Set the DC1880A LDO jumpers (JP11 and JP12) and
DC590 VCCIO jumper (JP6) to one of the combina-
tions listed in Table 1. Default jumper positions set
both boards to 5V.
b. When using a Linduino™ One instead of a DC590
board, set the DC1880A LDO to 5V (JP11 = 5.0V)
or disable it (JP12 = OPEN).
5. Before connecting the input power supply to the
DC1880A board, verify the voltage is below 40V
(normally between 8V and 30V) and that the supply
is turned off.
6. Connect the power supply between V
DD
and GND on
the DC1880A board as shown in Figure 1.
7. Connect line interface cables (up to 20m long) to either
the screw-terminal blocks (J1-J4) or the IO-Link con-
nectors (J5-J8).
8. Turn on the 24V power supply and verify that the
IRQ
LED on the DC1880A board is lit. (The LTC2874 is
signalling that one or more of its supplies had been
low.)
9. Launch the GUI software. Refer to the Using the
LTC2874 Software section for more information on
how to control the LTC2874 using the GUI.
10. Clear the
IRQ
condition by clearing any Supply Event
bits that are set. On the Events tab, simply click on any
lamps that are lit.
11. Refer to the Additional Information section and the
data sheet for operating details.
