AS3688

austriami crosyst ems

Preliminary Product Brief, Confidential

www.austriamicrosystems.com (ptr)

Revision 0.1 / 20051205

2 - 3

4

Block Diagram

Figure

1 – Application Diagram of the AS3688: Option shown: Step up DCDC converter, RGB Current Sinks

Step Up DC/DC

Converter

C9

4.7µF

C10

1.5nF

Q1

SENSE_N

(CURR43)

DCDC_GATE

DCDC_FB

(CURR41)

R3

1M

R4

100k

C11

15nF

C2

1µF

R2

Battery

SENSE_P

(CURR42)

Charge Pump

1:1, 1:1.5, 1:2

400mA / 900mA

Battery

VBAT1

VBAT2

C2_P

C5

2.2µF

C6

2.2µF

C2_N

C1_P

C7

2.2µF

C1_N

CPOUT

D3

D4

D5

C8

2.2µF

CURR30

CURR31

CURR32

Current Sinks

each 0.6-300mA

D7

D8

D9

D10

D12

D11

White LEDs,

Backlight

CURR1

CURR2

Current Sinks

each 0.15-38.5mA

Serial

Interface

R5

1-10k

VDD_GPIO

CLK

CLK

DATA

GPIO/

ADC

V2_5

GPIO0 GPIO1

GPIO2

GPI

VDD_GPIO

LDO VANA1

1.85-3.4V

150mA

References

and

Temperature

Supervision

C4

1µF

C3

2.2µF

C1

100nF

R1

220k

LDO VANA1

e.g. 2.8V

Battery

VBAT3

VANA1

V2_5

RBIAS

CREF

RGB1

RGB2

RGB3 (VANA2)

Current Sinks

0.15-38.5mA

OLED

Charge Pump

(Alternative Function)

Battery or CPOUT

D13,D14,D15

D1

L1

10µH

DATA

AS3688 Lighting

Management

Unit

8Bit PWM

Generator

Automatic Dimming

and LED Pattern

Generator

Vtemp

Strobe

Preview

Timer

3 x 0.15-38.5mA

Current Sinks

(Alternative Function)

CURR33

D6

LDO VANA2

1.85-3.4V

150mA

C12

2.2µF

LDO VANA2

e.g. 2.8V

LED

Test

R6