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Board Set-Up

5 Board Set-Up

The LM3533EVM requires jumpers installed at the following headers for proper operation:

1. 1.8V/VIO/VIN: The center pin (VIO) of this three position header connects to the top side of the pull-up

resistors (RSCL, RSDA, RSOL, and RHWEN). Jumper this pin to either the 1.8V output from the on

board LDO or to VIN.

2. VOUT: The VOUT header connects the LM3533's boost output to the top side of the high voltage LED

strings (HL1 and HL2)

3. VIN/VL: This header jumpers the voltage at VL to the LM3533's IN bump (VIN)

4. ANODES: This header jumpers the LM3533's charge pump output to the top side of the low voltage

indicator LEDs (RGB, DL4, and DL5)

Once the jumpers are installed, connect a 2.5V to 5.5V power supply to the banana plug inputs (VL) and

(GND).

6 USB Interface Board

The LM3533 Evaluation Board can be controlled via an I

C master by connecting directly to the I

C header

(SCL SDA) or it can be controlled with the USB Interface Board. The USB Interface Board requires the

use of the LM3533.exe software that operates from a PC.

To operate the LM3533 Evaluation Board with the USB Interface Board, ensure the LM3533 Evaluation

Board is connected to the USB Interface Board. The boards are keyed so they will only fit together one

way. Next, follow the jumper settings in Section 5. After this, apply power to the board and open the

LM3533.exe program. The LM3533.exe software is grouped into tabs, see the following sections for each

tab description.

7 LM3533 Graphical User Interface

Figure 8. Main Control Tab

SLOA172B–June 2012–Revised April 2013 AN-2250 LM3533 Evaluation Kit

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