LTC3206EUF datasheet(5/16 Pages) LINER

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LTC3206

3206f

SUB1, SUB2 (Pins 1, 2): 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 exponentially increasing bright-

ness levels from 0.78% to 100% of full-scale. See Table 1.

C1+, C1–, C2+, C2– (Pins 5, 4, 6, 3): Charge Pump Flying

Capacitor Pins. A 2.2µF X7R or X5R ceramic capacitor

should be connected from C1+ to C1– and another from

C2+ to C2–.

DVCC (Pin 7): This pin sets the logic reference level of the

SDA, SCL and ENRGB/S pins.

SDA (Pin 8): Input Data for the I2C Serial Port. Serial data

is shifted in one bit per clock to control the LTC3206 (see

Figures 3 and 4). The logic level for SDA is referenced to

DVCC.

SCL (Pin 9): Clock Input for the I2C Serial Port (see Figures

3 and 4). The logic level for SCL is referenced to DVCC.

ENRGB/S (Pin 10): This pin is used to enable and disable

either the RED, GREEN and BLUE current sources or the

SUB display depending on which is programmed to re-

spond via the I2C port. Once ENRGB/S is brought high, the

LTC3206 illuminates the RGB or SUB display with the

color combination or intensity that was previously pro-

grammed via the I2C port. The logic level for ENRGB/S is

referenced to DVCC.

IMS (Pin 11): This pin controls the maximum amount of

LED current in both the MAIN and SUB LED displays. The

IMS pin servos to 0.6V when there is a resistor to ground.

The full scale (100%) currents in the MAIN and SUB

display LEDs will be 400 times the current at the IMS pin.

IRGB (Pin 12): This pin controls the amount of LED current

at the RED, GREEN and BLUE LED pins. The IRGB pin

servos to 0.6V when there is a resistor to ground. The

current in the RED, GREEN and BLUE LEDs will be 400

times the current at the IRGB pin when programmed to full

scale.

SGND (Pin 13): Ground for the control logic. This pin

should be connected directly to a low impedance ground

plane.

PI FU CTIO S

CPO (Pin 14): Output of the Charge Pump. This output

should be used to power white, blue and “true” green

LEDs. Red LEDs can be powered from VIN or CPO. An X5R

or X7R low impedance (ceramic) 2.2µF charge storage

capacitor is required on CPO.

VIN (Pin 15): Supply Voltage for the Charge Pump. The VIN

pin should be connected directly to the battery and by-

passed with a 2.2µF X5R or X7R ceramic capacitor.

RED, GREEN, BLUE (Pins 16, 17, 18): 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 4096 colors for the

illuminator. See Table 1. The RGB LEDs are modulated at

1/240 the speed of the charge pump oscillator (approxi-

mately 4kHz).

MAIN1-MAIN4 (Pins 22, 21, 20, 19): Current Source

Outputs for the Main Display White LEDs. The current for

the main display is controlled by the resistor on the IMS

pin. The LEDs on the MAIN display can be set to 16

exponentially increasing brightness steps from 0.78% to

100% of full scale. See Table 1.

AUX1, AUX2 (Pins 23, 24): Current source outputs for the

auxiliary white LEDs. The auxiliary current sources can be

individually assigned to be either MAIN display or SUB

display LEDs via the I2C serial port. When either AUX1 and/

or AUX2 are assigned to the MAIN display they will have

the same power setting as the other MAIN LEDs. Likewise,

when either AUX1 and/or AUX2 are assigned to the SUB

display they will have the same power setting as the other

SUB LEDs. The currents for the AUX1 and AUX2 pins are

controlled by the resistor on the IMS pin.

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

Charge Pump. This pin should be connected directly to a

low impedance ground plane.

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