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Hardware Set-Up

3 Hardware Set-Up

Figure 2. LM3549 Evaluation Board Setup

The LM3549 evaluation kit is based on a one board system, where the USB communication and

evaluation related components are assembled onto one board, (see Figure 2). The evaluation board was

designed especially for evaluation and, therefore, is not optimized for the smallest layout size. The

components are physically large to make changing component values easier.

LM3549 input voltage VDD can be supplied from the USB port or by connecting an external power supply

to the X1 connector. If voltage is supplied from USB port shunt needs to be placed on the VDD position of

P2 pin rail. If external power supply is used this shunt needs to be removed. USB port's maximum output

current is 500mA. This is not enough to drive the LEDs with maximum output current but can be used to

test functionality of the LM3549.

Figure 2 shows how to setup the LM3549 evaluation board. This configuration uses onboard

microcontroller to control the LM3549’s logic inputs. If one wishes to use external source to drive the

control signals, control signal jumpers needs to be removed and external control signals needs to be

connected to the right side of the P2 pin rail. Control signals are labeled for easy connection.

C interface pull-up resistors are placed on the microcontroller side of the control signal jumpers. If

external I

C interface is connected to the board it needs to have pull-up resistors. LM3549 I2C ID is 36h

(in 7bit format) -> write = 6Ch (8-bit format) and read = 6Dh (8-bit format)

SNVA443A–August 2010–Revised April 2013 AN-2062 LM3549 Evaluation Kit

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