LTC3205 datasheet(6/16 Pages) LINER

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LTC3205

3205f

BLOCK DIAGRA

–

IMS

VIN

800kHz

OSCILLATOR

1:1 AND 2:3 CHARGE PUMP

–

IRGB 13

SGND 17

DVCC 12

STEPUP 11

ENRGB 10

SCLK

DIN 7

23 MAIN4

24 MAIN3

21 SUB2

22 SUB1

1 MAIN2

20 BLUE

3205 BD

19 GREEN

18 RED

2 MAIN1

CONTROL

LOGIC

PWM

COMMAND LATCH

SHIFT REGISTER

–

C1+

C1–

C2+

C2–

PGND

CPO

ENABLECP

PI FU CTIO S

VIN (Pin 16): Supply Voltage for the Charge Pump. The VIN

pin should be connected directly to the battery and by-

passed with a 1

µF X5R or X7R ceramic capacitor.

SGND (Pin 17): Ground for the Control Logic. This pin

should be connected directly to a low impedance ground

plane.

RED, GREEN, BLUE (Pins 18, 19, 20): Current Source

Outputs for the RGB Illuminator LEDs. The currents for

the RGB LEDs are controlled by the resistor on the IRGB

pin. The RGB LEDs can independently be set to any duty

cycle from 0/15 through 15/15 under software control

giving a total of 16 shades per LED and a total of 4096

colors for the illuminator. See Tables 1 and 3. The RGB

LEDs are modulated at 1/240 the speed of the charge

pump oscillator.

SUB1, SUB2 (Pins 22, 21): Current Source Outputs for

the Sub Display White LEDs. The current for the sub

display is controlled by the resistor on the IMS pin. The

LEDs on the sub display can be set to 100%, 50%, 25% or

0% of full scale under software control. See Tables 1

and 2.

PGND (Pin 25, Exposed Pad): Power Ground for the

Charge Pump. The exposed pad should be connected

directly to a low impedance ground plane.

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