AS3675 datasheet(25/81 Pages) AMSCO

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AS3675

Datasheet - D e ta i l e d D e s c r i p t i o n

8.4

Current Sinks

The AS3675 contains general purpose current sinks intended to control RGB LEDs, white LEDs (e.g. backlights) and

can also be used for buzzers or vibrators. All current sinks have an integrated over voltage protection.

CURR1, CURR2 and CURR6 are also used as feedback for the Step Up DC/DC Converter (regulated to 0.5V in this

configuration) see Feedback Selection on page 12.

Current sinks CURR1, CURR2 and CURR6 are high-voltage compliant (15V) current sinks, used e.g., for series of

white LEDs

Current sinks CURR3x (CURR30, CURR31, CURR32 and CURR33) are parallel 5V current sinks, used for back-

lighting, indicator LEDs or RGB LEDs.

Current sinks RGB1, RGB2, and RGB3 are general purpose current sinks e.g. for a fun LED.

Current sinks CURR4x (CURR41, CURR42, and CURR43) are general purpose current sinks.

Table 21. Current Sink Function Overview

Current Sink

Max.

Voltage

(V)

Max.

Current

(mA)

Resolution

Software

Current

Control

Hardware On/Off

Control

Can be assigned to

Audio Controlled

LED Channel

(Bits)

(mA)

CURR1

15.0

38.25

0.15

Separate

LED Pattern;

Internal PWM

ch1

CURR2

ch2

CURR6

ch3

CURR30

VBAT

(5.5V)

38.25

(75.6mA

for strobe

curr3x_str

obe_high=

80.15

Combined in

Strobe/

Preview

Separated

Flash LED Strobe

(CURR1 or

CURR30) &

Preview

(CURR2);

Internal PWM;

LED Pattern

Completely individual

assignment of the

audio channels

ch1,ch2 and ch3 to the

outputs

CURR31

CURR32

CURR33

RGB1

38.25

0.15

Separate

LED Pattern;

Internal PWM

ch1

RGB2

ch2

RGB3

ch3

CURR41

38.25

0.15

Separate

LED Pattern;

Internal PWM

ch1

CURR42

ch2

CURR43

ch3

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