6
dc1880af
DEMO MANUAL DC1880A
using the Dc1880a software
Introduction
Linear Technology’s QuikEval software provides a quick
and easy way to evaluate most aspects of LTC2874 opera-
tion. It operates a SPI interface that reads or writes from
the 14 onboard registers via a DC590 serial controller.
Install QuikEval BEFORE connecting the DC1880A to the
USB port of the PC. Download and run the installation
program from
http://www.linear.com/software
and follow
the onscreen instructions. The LTC2874 GUI will launch
automatically when the PC begins communicating with
the DC1880A via the serial controller. Thereafter, start
the GUI by running QuikEval from:
C:\Program Files\LTC\QuikEval\quikeval.exe
If the QuikEval software was installed previously, update
it to the latest version using Tools > Update Program.
The LTC2874 GUI is composed of a main window having
three tabs, and a Register Map window. The Ports tab
(Figure 2) contains controls and monitors that are unique to
each individual port. The Timers and Globals tab (Figure 3)
contains controls and monitors that are common to all
ports. The Events tab (Figure 4) provides access to event
monitoring registers. The Register Map window (Figure 5)
provides access to all register bits via an alternate format.
The LTC2874 GUI begins communicating with the DC1880A
automatically. Once running, it continuously polls the
LTC2874 registers to monitor status.
Connect/Disconnect Button
The Disconnect button disables the SPI interface and most
of the GUI. The Connect button restarts SPI polling and
activates the complete GUI.
Reset Button
This button issues a SPI Reset command, returning all
registers to default values.
Events Tab
This tab contains lamps that map to Event Register bits.
A lamp that is on indicates that the corresponding bit in
the LTC2874 Event Register has been set. Clicking on a
lamp will clear the Event bit if the condition no longer
persists. Event Register behavior is sticky, meaning each
lamp stays on until cleared.
The check boxes control which events will cause
IRQ
to
signal.
Register Map
This window presents all register bits in an alternate format.
Change register values directly by clicking on individual
bits, using arrow widgets, or by entering numeric values.
Changed bits appear yellow until either committed to the
LTC2874 by pressing the Write and Update button, or
cleared by pressing the Discard Unwritten Changes button.
The Save Current Values button saves the LTC2874 register
values to a text file. The Load Saved Values button loads
the register values from one such file into the Register Map
window. (Write and Update will then configure LTC2874
accordingly.)
Running QuikEval GUI Using Linduino One
The QuikEval GUI software for DC1880A may be operated
using a Linduino One (DC2026) with the DC590 emulator
sketch in place of the DC590. When using this USB-isolated
Arduino-compatible demonstration board, set the DC1880A
LDO to 5V (JP11=5.0V) or disable it (JP12=OPEN).
