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CONFIGURING IPEAK
The peak current limit of the LTC3337 (I
figured by moving the JP1-JP3 shunts on the DC2973A
demo board. Note that the IPEAK setting is locked at
startup.
Refer to Table 1 to configure the IPEAK setting. This
table is also located on the back of the DC2973A PCB.
SOFTWARE TOOLS
On-Board Digital Interface
The LTC3337 demo board includes an Atmel SMART SAM
D21 processor with an Arduino bootloader that makes it
compatible with the Arduino IDE. This means users can
prototype processor functionality directly in the free Ardu-
ino IDE. The SDK mentioned below includes an Arduino
example project that can be opened and uploaded to the
board through the Arduino IDE.
Software Development Kit
To help with learning and development of LTC3337 appli-
cations, there exists a Software Development Kit (SDK)
that makes interfacing with the LTC3337 as simple as
possible. The package includes a few example programs
and comes fully equipped with register names and value
formatting. Resources are given for both C code (with
Arduino examples) and Python code. This SDK can be
downloaded from the LTC3337 product webpage. Fur-
ther instructions to use the SDK are included within the
download.
DEMO MANUAL DC2973A
) is con-
Table 1. IPEAK Configuration
PEAK
JUMPER CONFIGURATION
IPK2
0
0
0
0
1
1
1
1
Restoring GUI-Compatible Firmware
If the onboard firmware is changed (to upload SDK firm-
ware, for example), it can be restored at any time through
the GUI. In this case, the GUI will need to be launched
manually because QuikEval will not recognize the board
once it has been reprogrammed. By default, the GUI
installs to:
C:\Program Files (x86)\LTC\LTC3337 GUI\em3337.exe
Debugging Custom Designs
The DC2973A's default firmware and engineering GUI tab
are designed to give a high-speed debugging environment
for LTC3337 operation. This functionality can be easily
extended to interface with your own custom LTC3337 cir-
cuit design. To use the engineering GUI tab with a custom
circuit board, simply leave the LTC3337 on the DC2973A
unpowered and connect your own board to the SMBus
interface accessible through header J3.
IPK1
IPK0
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
IPEAK
5mA
10mA
15mA
20mA
25mA
50mA
75mA
100mA
Rev. 0
3
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