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dc2197afa
DEMO MANUAL DC2197A
Quick start proceDure
Standalone Operation
DC2197A makes evaluation of the LTC2645 very easy.
Figure 1 shows the basic connections to operate the
DC2197A as a standalone board. Connect a 2.7V to
5.5V supply to the VCC turret and a GND turret. IOVCC
is connected to VCC by default such that the input logic
level matches the VCC supply. If a different logic level is
required, move the IOVCC jumper to the EXT position and
connect a supply equal to the PWM signals’ logic level
to the IOVCC and GND turrets. There is no sequencing
requirement between VCC and IOVCC.
Any convenient PWM source can be used. A pulse genera-
tor with a computer interface (GPIP, USB, Ethernet, etc.)
can be used for characterization. In the end application,
signals can originate from an FPGA, microcontroller,
programmable logic controller (PLC), optocoupler, etc.
Linduino Operation
DC2197A is in an “Arduino Shield” form factor, compat-
ible with Linear Technology’s DC2026 Linduino board and
other Arduino Uno compatible boards. This provides a
convenient way to evaluate the LTC2645 under computer
control. The Linduino board has two PWM outputs with
16-bit resolution and four with 8-bit resolution. INA and
INB are connected to 16-bit PWM capable outputs on
digital pins 9 and 10, INC and IND are connected to 8-bit
PWM capable outputs on digital pins 5 and 6; these can
be remapped by removing R8 – R11 and making appro-
priate connections to TPA – TPD. The Linduino program
(“sketch”) provides a simple terminal interface allowing
voltages or codes to be entered manually. It can also be
controlled by any programming language that can com-
municate with a USB virtual COM port (Matlab, Python,
C
++
, C#, etc.) The program can be modified as desired to
change or add functionality.
Install the DC2197A onto the DC2026 as shown in Figure 2.
Ensure that the IOVCC jumper is set to VCC.