Linear Technology LTC3210-2 Bedienungsanleitung

QUICK START GUIDE FOR DEMONSTRATION CIRCUITS 1071

MAIN/CAM LED CONTROLLER

LTC3210-2/LTC3210-3

WARNING: The LEDs on this demo board produce very bright light. Do not look directly at LEDs when power is

applied. Serious eye damage may occur.

DESCRIPTION

Demonstration circuit 1071 is a multi-display LED

controller featuring the LTC3210-2 or the LTC3210-3.

The LTC3210-2/LTC3210-3 are low noise charge

pumps designed to drive three or four MAIN LEDs

and one high current CAM LED. The LTC3210-

2/LTC3210-3 require only four small ceramic capaci-

tors plus two resistors to form a complete LED power

supply and current controller.

The maximum display currents are set with a 30.1K

ohm resistor to provide up to 20mA for each Main

LED and a 24.3K ohm resistor to provide up to

378mA for the CAM display. Current for each LED is

controlled with a precision internal current source.

The intensity of the displays are adjusted by strobing

the ENM and ENC pins. See the LTC3210-2/LTC3210-

3 data sheet for more information on this process.

The DC1071 uses a PIC controller to interface be-

tween the DC590 board and the LTC3210-2/LTC3210-

3 via a 2-wire I

C serial interface. There are 32 dim-

ming states available for the MAIN display and 8

dimming states available for the CAM display.

The charge pump optimizes efficiency based on the

voltage across the LED current sources. The part

powers up in 1X mode and will automatically switch

to boost mode whenever any enabled LED current

source begins to drop out. The first dropout switches

the part to 1.5X mode and a subsequent dropout

switches the part into 2X mode. The part resets to 1X

mode whenever the part is shut down.

Design files for this circuit board are available. Call

the LTC factory.

, LTC and LT are registered trademarks of Linear Technology Corporation.

QUICK START PROCEDURE

Demonstration circuit 1071 is easy to setup. Refer

to Figure 1 for the proper measurement equipment

setup and follow the procedure below.

Refer to the DC590 Quick Start guide for

QuikEval

setup and software installation details.

Make sure the USB cable is connected between

the computer and the DC590 controller board.

Connect DC1071 to the DC590 USB Serial Con-

troller using the supplied 14-conductor ribbon

cable as shown in Figure 1.

Attach a 2.9 – 4.5V power source to the Vin and

GND turrets of the DC1071 demo board. This is

the Vin power supply for the device (see applica-

tion schematic).

The DC1071 has an extra 4.7uF

de-coupling capacitor between Vin and GND to

help accommodate long lead lengths. The DC590

board gets its power from the USB cable.

Run the QuikEval

program. The program de-

tects the DC1071 and displays the LTC3210-2/ 3

control window (shown in Figure 2).

QUICK START GUIDE FOR DEMONSTRATION CIRCUITS 1071

MAIN/CAM LED CONTROLLER

LTC3210-2/LTC3210-3

Figure 1. Proper Measurement Equipment Setup for DC1071A

USING THE LTC3210-2/LTC3210-3 QUICKEVAL SOFTWARE

The program provides brightness controls for

the MAIN and CAM LEDs. The UPDATE but-

ton updates the PIC controller and the LED

displays to the current settings on the

LTC3210-2/LTC3210-3 demo control window.

The FLASH button flashes the CAM LED from

the ENCT (Torch) setting to the ENCF (Flash)

setting for the time selected in the FLASH

TIME drop-down window. The FLASH TIME

drop-down window allows the user to select

the flash time from 50ms to 1000ms in various

increments. The GRADATION Cycle button

briefly illustrates how the LTC3210-

2/LTC3210-3 may increment and decrement

the displays. The LEDS OFF button resets all

LEDs to zero and stops the gradation cycle.

VIEW LTC3210-2/3 PRODUCT PAGE Button

–This button opens an internet browser and

searches the Linear Technology Corporation

web site for information on the LTC3210-2

when an internet connection is available.

QUICK START GUIDE FOR DEMONSTRATION CIRCUITS 1071

MAIN/CAM LED CONTROLLER

LTC3210-2/LTC3210-3

ENM Control – This vertical slide control ad-

justs the MAIN display from 0 to 20mA in 32

steps. This is accomplished by clicking on the

up or down arrows to change it by one LSB,

by clicking in the vertical scroll bar to incre-

ment by 4 LSBs, or by clicking and dragging

the slide pointer. The individual LED current

and the number of pulses required to achieve

this current are displayed in the two text boxes

below the slider.

ENCT Control – This vertical slide control ad-

just the CAM display from 0 to 162mA in 4

steps. The current is limited in software be-

cause some LEDs can not handle large con-

tinuous currents. The LED intensity may be

adjusted by clicking on the up or down arrows

to change it by one LSB, by clicking and drag-

ging the slide pointer, or by clicking in the ver-

tical scroll bar. The LED current and the num-

ber of pulses required to achieve this current

are displayed in the two text boxes below the

slider.

ENCF Control – This vertical slide control

sets the CAM display intensity during a flash

condition from 0 to 378mA in 8 steps. When

the FLASH button is selected, the CAM dis-

play illuminates at the intensity set by the

ENCF control on the release of the mouse

button for the length of time selected in the

FLASH TIME drop-down window. The LED

flash intensity may be adjusted by clicking on

the up or down arrows to change it by one

LSB, by clicking and dragging the slide

pointer, or by clicking in the vertical scroll bar.

The LED flash current and the number of

pulses required to achieve this current are

displayed in the two text boxes below the

slider.

FLASH Button – When this button is selected

and released, the CAM LED will flash at the

intensity selected in the ENCF register for a

period selected in the FLASH TIME drop-

down window. This is accomplished by reset-

ting the internal counter and DAC by holding

ENC low for the set PULSE TSD time then

applying the set number of pulses on the ENC

pin when the mouse button is released. After

the flash time has elapsed, the CAM display is

set back to the ENCT setting by holding ENC

low for set PULSE TSD time then applying the

set number of pulses on the ENC pin.

FLASH TIME Drop-Down Window – This

window allows the user to select a flash time

from 50ms to 1000ms in various increments.

The flash time is the time the program sets

the CAM display to the ENCF setting on the

release of the mouse button after the FLASH

button was selected.

PULSE TON Drop-Down Window – This win-

dow allows the user to select a pulse ON time

for the ENM and ENC pulses. The ON time

may be adjusted from 5us to 20us in 5us in-

crements.

PULSE TOFF Drop-Down Window – This

window allows the user to select a pulse OFF

time for the ENM and ENC pulses. The OFF

time may be adjusted from 5us to 20us in 5us

increments.

PULSE TSD (RESET) Drop-Down Window –

This window allows the user to select a pulse

TSD time for the ENM and ENC pulses. This

is the time the ENM and ENC pins are held

low to reset the internal counters and DACs

prior to sending the pulses to the enable pins.

This time may be adjusted from 250us to

1000us in various increments.

GRADATION STEP TIME Drop-Down Win-

dow – This window allows the user to select

the length of time for each gradation step

while running the GRADATION Cycle. See

GRADATION Cycle button for more details on

this function. The gradation step time may be

adjusted from 50ms to 250ms in various in-

crements.

UPDATE Button – When this button is se-

lected, the PIC is updated with the timing and

ENM and ENC information, and the LED dis-

QUICK START GUIDE FOR DEMONSTRATION CIRCUITS 1071

MAIN/CAM LED CONTROLLER

LTC3210-2/LTC3210-3

plays are updated to the present settings on

the demo control window. This is beneficial

when power is initially applied to the demo

board, the ribbon cable has been discon-

nected, or when the PIC RESET push button

has been depressed.

GRADATION Cycle Button – This button

may be selected to start or stop the

GRADATION Cycle. The GRADATION Cycle

cycles through the brightness levels of all the

LEDs starting from the lowest to the highest

intensity of the Main display and then back to

the lowest. Then it cycles through the intensi-

ties of the CAM display, and then both dis-

plays. To increase the LED intensity, the en-

able pins are held low for the set PULSE TSD

time prior to the first pulse of each step. After

the highest intensity is reached, the intensity

is then decreased by a single low pulse equal

to the PULSE TOFF time for each step. This

pulse decrements the internal counter by one

from the previous setting. This is done until

the lowest setting is reached. The gradation

cycle is repeated until the GRADATION Cycle

button is selected again or until the LEDS

OFF button is selected.

LEDS OFF Button – This button turns off all

of the LEDs and turns off GRADATION Cycle.

PIC RESET Push Button – This button is lo-

cated on the DC1071 demo board. It Resets

the PIC when depressed. The reset button will

not update or change the demo control win-

dow. The UPDATE button may be used to up-

date the PIC to the current demo control win-

dow settings.

QUICK START GUIDE FOR DEMONSTRATION CIRCUITS 1071

MAIN/CAM LED CONTROLLER

LTC3210-2/LTC3210-3

Figure 2. LTC3210-2/3 Control Window

QUICK START GUIDE FOR DEMONSTRATION CIRCUITS 1071

MAIN/CAM LED CONTROLLER

LTC3210-2/LTC3210-3

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC1071A-B DC1071A-A

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