CAT3626AEVB Datasheet CAT3626AEVB | P1-P3

 Semiconductor Components Industries, LLC, 2011

September, 2011 − Rev. 3

1 Publication Order Number:

EVBUM2018/D

CAT3626AEVB

CAT3626 6-Channel LED

Driver Evaluation Board

User's Manual

Introduction

This document describes the CAT3626DB1

evaluation/demonstration board for the ON Semiconductor

CAT3626 6−Channel LED driver with I

C interface. The

functionality and major parameters of the CAT3626 can be

evaluated with the CAT3626DB1 board.

The CAT3626 is a 6−channel charge pump that has been

designed to drive up to 6 LEDs connected in parallel. The

device can drive three groups of two LEDs. Each group can

be configured with independent LED current of up to 32 mA

max per channel through the I

C serial interface. The

CAT3626 is operating in either 1x mode (LDO), or 1.5x

mode and provides tightly matched regulated current

through the six LED outputs. Each LED channel can be also

turned off/on independently through the I

C bus. Detailed

descriptions and electrical characteristics are in the

CAT3626 data sheet.

CAT3626EVAL1 Board Hardware

The board contains the CAT3626 in a typical application

circuit, driving 2 RGB LEDs or 6 white LEDs. The

CAT3626 is controlled through the I

C serial interface using

an 8−bit microcontroller. The user can chose to drive on/off

any LEDs combination or to set the desired LED current

through a PC serial interface. The board is powered from an

attached 9 V battery. The block diagram of the board

hardware schematic is shown in Figure 1.

Figure 1. CAT3626DB1 Block Schematic

Serial

Interface

8 Bit

MCU

Power

Supply

CAT3626

SCL

SDA

VIN VOUT

LED A1

LED A2

LED B1

LED B2

LED C1

LED C2

VEXT VIN

VBAT

9 V

3 V

5 V

1 mF

J1 J2 J3 J4 J5 J6

VOUT

2 x RGB LED

1 mF

C2 C3 1 mF1 mF

http://onsemi.com

EVAL BOARD USER’S MANUAL

CAT3626AEVB

http://onsemi.com

The CAT3626 input voltage, VIN is supplied on board

from a fixed +5 V or +3 V voltage (internally provided) or

from an external voltage applied to the VEXT (T5) pad. The

voltage supplied at the VIN input of the CAT3626 device can

be selected using the jumper options for the K1 connector.

When using an internal supply (9 V battery), set the jumper

to position 1−6 for the +5 V voltage or to position 2−5 for the

+3 V voltage. To apply an external voltage, a shunt must be

placed in position 3−4 and an additional shunt must be

placed in either the 1−6 or 2−5 position.

The board uses an 8−bit microcontroller, 8051 type. The

microcontroller provides the signals on the SCL, SDA and

EN lines to control the CAT3626.

The user can connect, or disconnect the CAT3626 outputs

to the LEDs using the jumper options for J1, J2, J3, J4, J5,

J6 and J7 connectors. J1 to J7 header pin connectors can be

used to insert a current meter to evaluate the programmed

LED current on each channel.

The board is powered when the “POWER” switch is ON.

The CAT3626DB1 boards are populated with two RGB

LEDs (Everlight EL61−23RGBC).

The component placement, top side, for the

CAT3626DB1 and the board picture are shown in Figure 2.

The detailed schematic and the list of components for the

CAT3626DB1 are shown in the Appendix attached in the

end of this document.

Board Operation

Stand−alone Board

The board can be also used as a demonstration board

without connection to the PC interface. As a standalone

board, when the POWER switch is turned ON, the

microcontroller starts executing a routine that sequentially

sets different LED current values for each of 3 groups LED

output channels. As a result the 2 RGB LEDs will provide

the colors mixing between RED, GREEN and BLUE with

different intensities. This loop is executed as long as the

board is powered.

NOTE: To use as a stand−alone board, the J9 connector

must have the jumper removed; otherwise, the

microcontroller does not start the routine of

controlling the CAT3626 at power−on.

CAT3626DB1 Board Controlled through the PC Serial

Interface

The user can set the desired LED current value for each of

CAT3626 output channel connecting the CAT3626DB1

through a PC serial interface. The CAT3626DB1 software

provides the user a very friendly graphical interface (GUI)

for sending all the commands to drive on/off any LEDs

configuration and to program the LEDs current.

The CAT3626DB1 software requires the following

minimum system configuration:

 Microsoft Windows 98SE or Above

 100K of Available Hard Disc Space

 Serial Interface Port

The software is available on the CAT3626DB1 software

distribution CD−ROM or can be downloaded at:

http://www.onsemi.com/PowerSolutions/evalBoard.do?i

d=CAT3626AEVB

The CAT3626DB1 software is an executable program

(“CAT3626DB.exe”) which can be run from any directory

or CD.

Figure 2. CAT3626DB1 Component Placement − Top Side

CAT3626AEVB

http://onsemi.com

The following steps should be followed to control the

CAT3626DB1 demo board from the PC:

1. Connect the CAT3626DB1 board to the PC serial port

through a cable with 9−pin connectors, extender type.

(For a limited quantity the connection cable is

provided).

2. Connect a jumper shunt at J9 connector. This allows

the CAT3626 to remain disabled (EN = “0”) at

power−on.

3. Power the CAT3626DB1 board: Turn the “POWER”

switch ON. (The board should be powered when you

start the program; otherwise an error message will be

displayed).

4. Run the “CAT3626DB.exe” program from the

directory where the software was installed.

5. The CAT3626 Demo Board user interface window

opens (Figure 3).

6. When the program starts, the board will be in the

disabled state. Press the “ENABLE” button and the

CAT3626 will be enabled. After setting the EN input

high, the user can write into the Register_S to activate

the corresponding LED output channels. Figure 4

shows all the LED channels active. The current for

each channel is set at the minimum value (= 0.5 mA).

7. Using the CAT3626DB1 software the user can access

all the internal registers of the CAT3626:

 Register A: set the LED current for group A

(LEDA1, LEDA2) – associated with Red from

RGB LEDs

 Register B: set the LED current for group B

(LEDB1, LEDB2) – associated with Green from

RGB LEDs

 Register C: set the LED current for group C

(LEDC1, LEDC2) – associated with Blue from

RGB LEDs

 Register S: controls the ON/OFF state of each

LED channel independently.

Figure 3. CAT3626DB1 Software Interface Window (Start Window)

The user can set the current for any group, writing the

associated register with the desired value. The current can be

set between 0.5 mA and 32 mA. These 64 steps corresponds

to the binary registers values of XX000000 to XX111111.

The user can change the LED current value writing the

corresponding binary value in the associated Register (A, B

or C). Every register has associated “Write” and “Read”

buttons to write and respectively read data. The current

value can be also changed moving the cursor or/and pressing

the arrows buttons on the slider associated to each register.

As an example, Figure 5 shows all the channels enabled

and the LED currents set to 15 mA (Group A – Red), 30 mA

(Group B – Green) and 3 mA (Group C – Blue).

P1-P3 P4-P6

CAT3626AEVB

Mfr. #:

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Manufacturer:

ON Semiconductor

Description:

LED Lighting Development Tools EVAL BOARD FOR DPP

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CAT3626AEVB