ON Semiconductor CAT3649AGEVB User Manual

CAT3649AGEVB

CAT3649 Evaluation Board
User's Manual

Introduction

This document describes the CAT3649 evaluation board
for the ON Semiconductor CAT3649 6−Channel
Quad−Mode LED Driver with an Ambient Light Sensor
circuit, NOA1211, that can control the LEDs intensity
proportionally with the ambient light intensity.

The functionality and major parameters of the CAT3649
can be evaluated with the CAT3649 evaluation board.

A detailed description and electrical characteristics are
available in the CAT3649 and NOA1211 datasheets.

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EVAL BOARD USER’S MANUAL

Board Hardware

The evaluation board contains one CAT3649 in an
application circuit driving a total of six LEDs and one
NOA1211. The Ambient Light Sensor is connected to the
LED driver via the C8051F321 microcontroller, which is
illustrated in Figure 2.

Figure 2. Ambient Light Sensor Mode Block Diagram

© Semiconductor Components Industries, LLC, 2012

November, 2012 − Rev. 1

Figure 1. CAT3649 Evaluation Board

1 Publication Order Number:

EVBUM2164/D

CAT3649AGEVB

Figure 3. CAT3649AGEVB Board Schematic

Table 1. BILL OF MATERIALS*

Desig-

nator

U1 1 6 Channel LED Driver - - TQFN16 ON

U2 1 Ambient Light Sensor - - 3 x 3 mm ON

U3 1 8 bit Microcontroller - - CUDFN Silicon

U4 1 Low Dropout Regulator (5 V to 3.3 V) - 1.6 x 1.6 ON

U5 1 5 V Voltage Regulator - - MLP-28 ON

D1 to D6 6 White LED - - SOT-223 Lite-On LTW-150TK Yes

D7 1 Red LED - - DPAK-3 Everlight EL17-215SURC Ye s

C1 to C4,

C6, C8,

C11, C13

C7, C9,

C10, C16,

C14

C5 1 Ceramic Capacitor 47 nF 10% 0805 AVX 08053C473KAT2A Ye s

C15 1 Tantalum Capacitor

Qty Description Value

8 Ceramic Capacitor

5 Ceramic Capacitor 100 nF 10% 0805 AVX 0805ZC104KAT2A Ye s

1 mF / 10 V,

X7R

10 mF/10V

Toler-

ance

10% 1206 Kemet C0805C105K9RACTU Ye s

10% 0805 Vishay TM8R106K010UBA Yes

Footprint Manufacturer

Semiconductor

Semiconductor

Laboratories

Semiconductor

Semiconductor

Manufacturer Part

Number

CAT3649HV3-GT2 No

NOA1211 No

C8051F321 Yes

CAT6218-330TDG No

MC78M05ABDT No

*All products listed are Pb−free.

Substi-

tution

Allowed

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CAT3649AGEVB

Table 1. BILL OF MATERIALS*

Desig-

nator

R1 1 SMD Resistor

R2 1 SMD Resistor

R3 1 SMD Resistor

R4, R5 2 SMD Resistor

R6 1 SMD Resistor

R7 1 SMD Resistor

R10 1 SMD Resistor

J1 to J6,

J8 to J11

J7 1 2-pin Header Connector,

ISP 1 5-pin Header Connector,

T1 – T8 8 Pin Receptacle (Test

K1 1 Slide Switch, SPDT - - 11.60 mm x

SW1,

SW2

BTH 1 Battery Holder 9 V - - 53.90 mm x

*All products listed are Pb−free.

10 3-pin Header Connector,

2 Pushbutton - - 3.50 mm x

0.1”, Single Strip

0.1”, Single Strip

0.1”, Single Strip

Points)

1/8 W, 100 kW

1/8 W, 4.7 kW

1/8 W, 180 W

1/8 W, 22 kW

1/8 W, 100 kW

1/8 W, 200 W

1/8 W, 0.5 W

- - 1.54 mm x

- - 1.54 mm x

- - 1.54 mm x

- - 1.54 mm x

Toler-

anceValueDescriptionQty

1% 0805 Vishay RL0805K100-1 Ye s

1% 1210 Vishay RL0805K004.7-1 Yes

1% 0805 Vishay RL0805K180-1 Ye s

1% 0805 Vishay RL0805K022-1 Ye s

1% 0805 Vishay RL0805K100-1 Ye s

1% 0805 Vishay RL0805E200-1 Ye s

1% 0805 Yageo RL0805FR-070R5L Ye s

4.62 mm

3.08 mm

7.70 mm

1.54 mm

4.00 mm

6.00 mm

29.60 mm

Manufacturer Part

NumberManufacturerFootprint

MMM 2303-6211TG Yes

MMM 2302-6211TG Yes

MMM 2305-6211TG Yes

Mil-Max Various Ye s

E-Switch EG1218 Yes

Schukat DTS31N Yes

Keystone 1294K-ND Yes

Substi-

tution

Allowed

Operating Procedure

The CAT3649EVAL board can be configured in two

operating modes: stand−alone or PC−controlled.

In both operating modes, the supply source for the VIN
rail is selected by the jumper J10 to be either 5 V or 3.3 V.
Table 2 shows the configurations for jumper J10 to set the
VIN voltage.

Table 2. VIN SELECTION

J10 VIN

1 − 2 5 V

2 − 3 3.3 V

Stand−alone

In this configuration, only the “Analog dimming”
function can be tested.

The Ambient Light Sensor (ALS) is disabled in this mode.

The jumper J11 must be set in (2−3) position for
stand−alone operation power.

The jumpers J8 and J9 must be set to (2−3) position to use
onboard pushbuttons EN/DIS and ADIM.

The evaluation board can be powered either from an
on−board 9 V supply (9 V alkaline battery) or from an
external supply applied between VBAT and GND test points
(located on the bottom side of the board, near the pins for the
battery holder).

The EN/DIS pushbutton allows the user to enable or to

shutdown the CAT3649 device.

The DIM pushbutton allows the user to program the LED

current in 32 discrete values. On each press on this
pushbutton, the “ADIM” input receives a 50 ms pulse. On
the rising edge of the pulse, the LED current is decreased by

3.2% from full scale.
The user can obtain the same effect by continuously

holding the DIM pushbutton down. For each 0.4 second
interval, the “ADIM” input of the device will receive a pulse.

PC Controlled

The CAT3649 EVAL board is equipped with a 8−bit

microcontroller and can be connected to the PC via USB
interface using a USB A/B type cable. This cable can be
obtained from a local electronics supply store.

The jumper J11 must be set in (1−2) position for USB

power operation.

The jumpers J8 and J9 must be set to (2−3) position to for

control of EN/DIS, ADIM, and PWM via USB.

In this mode, the board is powered from the USB

interface.

The GUI commands are described in the section

“Graphical User Interface (GUI)”.

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CAT3649AGEVB

Graphical User Interface (GUI)

After connecting the CAT3649 EVAL board to the PC via
USB cable, the user can run the program
CAT3649EVAL.exe.

If the program is started without the USB connection, the
following message is displayed: “The CAT3649EVAL

Board is not detected!”.

The CAT3649 operating mode is selected by pressing one
of the “check” buttons “PWM” or “ADIM”.

PWM Operation Mode

At start−up, on the GUI is selected, automatically, the
PWM mode of operation (as shown on Figure 4).

In this mode, the user can increase/decrease the LEDs
intensity by moving the potentiometer cursor or by pressing
the keys “−>” and “<−” on the keyboard after selection of the
potentiometer.

Now, in the frame “CAT3649 Command Mode”, the
PWM Timing Diagram for a frequency of 300 Hz is
displayed. The period of a pulse (3.3 ms) is the sum between
“Ton” and “Toff”.

ADIM Operation Mode

After pressing the “ADIM” button, the “ADIM” frame
becomes enabled (Figure 5). In the “CAT3649 Command
Mode” frame, the Timing Diagram is only a line that
represents the low level on the ADIM input.

If the “EN/DIS” button is pressed, the device will be
enabled. The red LEDs on the GUI and on the board will light.

The Timing Diagram represents, now, the high level on
the ADIM input. (Figure 6).

At this moment, the LEDs intensity is at full scale.

If the “DIM” button is pressed for a short time a single
pulse is applied to the “ADIM” input of the device.

If the “DIM” button is pressed continuously, at every 0.4
seconds, a pulse is applied to the device. (Figure 7).

If the “EN/DIS” button is pressed again, the device will be
disabled. The red LEDs on the GUI and on the board will be
off.

At this moment, on the ADIM input is at the low level.
(Figure 8).

The LEDs intensity is zero.

If the option button “Select” of the frame of the Ambient
Light Sensor is pressed while in PWM mode, the “Gain”
frame will be enabled.

In this frame only the “Power Down” option is selected,
because the “Ambient Light Sensor”, at this moment, is off.
(Figure 9).

The user can select one of the options “Medium” or “Low”
corresponding at the LED’s intensity level domain.
(Figure 10). Depending of the light’s intensity exposed to
the sensor, the LEDs will light proportionally.

Operating mechanism is as follows:

The sensor outputs a current proportional to the ambient
light. This current is converted to an output voltage by
resistor R6. The output voltage is applied to the input of the
10−bit ADC (Analog to Digital Convertor) from the
microcontroller.

The microcontroller converts the digital value, received
from ADC, into a PWM signal applied to the CAT3649 LED
Driver.

CAT3649 controls the six LEDs’ intensity.

Status Box

This box displays various messages about the application
status.

Ambient Light Sensor NOA1211 Operation Mode

The Ambient Light Sensor NOA1211 can command the

LEDs intensity using the microcontroller and the CAT3649.

Figure 4. GUI – PWM Mode

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CAT3649AGEVB

Figure 5. GUI – ADIM Mode Figure 6. GUI – ADIM Mode, Device Enabled

Figure 7. GUI – Pulses on ADIM Input Figure 8. GUI – ADIM Shutdown Command

Figure 9. GUI – NOA1211 Selection Figure 10. GUI – NOA1211 Power On

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5

CAT3649AGEVB

TEST PROCEDURE FOR THE CAT3649AGEVB EVALUATION BOARD

1. Set the switch K1 in “OFF” position.

2. Verify that shunts are installed on jumpers J1 to J6
in the top position.

3. Verify that a shunt is installed on jumper J7.

4. Set a jumper shunt on the header-pin connector
J11 in (1,2) position.

5. Set a jumper shunt on the header-pin connector J8
in (2,3) position.

6. Set a jumper shunt on the header-pin connector J9
in (2,3) position.

7. Set a jumper shunt on the header-pin connector
J10 in (1,2) position.

8. Connect the “CAT3649EVAL” board to the PC
through a USB serial interface cable.

9. Run the program “CAT3649 EVAL.exe”. On the
PC’s screen appears the CAT3649EVAL GUI. The
“CAT3649 EVAL” board will be powered up.

10. On the GUI, move the potentiometer cursor. On
the board, the light intensity of the LEDs will
change proportionally.

11. On the GUI, select the “Ambient Light Sensor”
frame and then, the “Medium Gain” button. On the
board, the light intensity of the LEDs will change
proportionally with the ambient light.

12. On the GUI, unselect the “Ambient Light Sensor”
frame.

13. On the GUI, select the CAT3649 ADIM and then,
“EN/DIS” button. On the board the red LED and
the white LEDs will light.

14. On the GUI, select the “DIM” button. On the
board, the LEDs light intensity will decrease. At
each selection of the “DIM” button, the LEDs light
intensity will decrease.

15. On the GUI, select the “EN/DIS” button. On the
board the red LED and the white LEDs will not
light.

16. Push the “EXIT” button on the GUI.

17. Disconnect the USB interface cable from PC and
“CAT3649 EVAL” board.

18. Insert a 9V battery in the battery holder.

19. Set a jumper shunt on the header-pin connector
J11 in (2,3) position.

20. On the board, set the switch K1 in “ON” position.

21. On the board, push the “EN/DIS” button. The red
LED and the white LEDs will light.

22. On the board, push the “DIM” button. the LEDs
light intensity will decrease. At each selection of
the “DIM” button, the LEDs light intensity will
decrease.

23. On the board, push the “EN/DIS” button. The red
LED and the white LEDs will not light.

24. On the board, set the switch K1 in “OFF” position.

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limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications
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