AS3689 datasheet(5/72 Pages) AMSOSRAM

5 / 72 page

AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

3 - 70

Table of Contents

General Description ......................................................................................................................................... 1

Key Features .................................................................................................................................................. 1

Application ...................................................................................................................................................... 1

Block Diagram ................................................................................................................................................ 2

Characteristics................................................................................................................................................ 4

5.1

Absolute Maximum Ratings ......................................................................................................................... 4

5.2

Operating Conditions ................................................................................................................................... 4

Typical Operating Characteristics................................................................................................................... 5

Detailed Functional Description ...................................................................................................................... 7

7.1

Analog LDO ................................................................................................................................................. 7

7.1.1

LDO Registers .................................................................................................................................. 9

7.2

Step Up DC/DC Converter......................................................................................................................... 10

7.2.1

Feedback Selection ........................................................................................................................ 11

7.2.2

Overvoltage Protection in Current Feedback Mode ........................................................................ 11

7.2.3

Voltage Feedback........................................................................................................................... 12

7.2.4

PCB Layout Tips............................................................................................................................. 13

7.2.5

Step up Registers ........................................................................................................................... 14

7.3

Charge Pump............................................................................................................................................. 15

7.3.1

Charge Pump Mode Switching ....................................................................................................... 17

7.3.2

Soft Start......................................................................................................................................... 18

7.3.3

Charge Pump Registers ................................................................................................................. 18

7.3.4

Usage of PCB Wire Inductance ...................................................................................................... 21

7.4

Current Sinks ............................................................................................................................................. 22

7.4.1

High Voltage Current Sinks CURR1, CURR2, CURR6................................................................... 23

7.4.2

Current Sinks CURR30, CURR31, CURR32, CURR33.................................................................. 26

7.4.3

RGB Current Sinks RGB1, RGB2, RGB3 (VANA, cpext) ............................................................... 30

7.4.4

General Purpose Current Sinks CURR4x, CURR5x....................................................................... 33

7.4.5

LED Pattern Generator ................................................................................................................... 35

7.4.6

External Overtemp comparator....................................................................................................... 38

7.4.7

External chargepump...................................................................................................................... 39

7.4.8

PWM Generator.............................................................................................................................. 42

7.5

General Purpose Input / Outputs ............................................................................................................... 47

7.5.1

GPIO Characteristics ...................................................................................................................... 48

7.5.2

GPIO Registers .............................................................................................................................. 49

7.6

LED Test.................................................................................................................................................... 50

7.6.1

Function Testing for single LEDs connected to the Charge Pump ................................................. 51

7.6.2

Function Testing for LEDs connected to the Step Up DCDC Converter......................................... 51

7.7

Analog-To-Digital Converter ...................................................................................................................... 52

7.7.1

ADC Registers................................................................................................................................ 53

7.8

Power-On Reset ........................................................................................................................................ 54

7.9

Temperature Supervision........................................................................................................................... 55

7.9.1

Temperature Supervision Registers ............................................................................................... 55

7.10 Serial Interface........................................................................................................................................... 56

7.10.1

Serial Interface Features ................................................................................................................ 56

7.10.2

Device Address Selection............................................................................................................... 56

7.11 Operating Modes ....................................................................................................................................... 59

Register Map ................................................................................................................................................ 60

External Components ................................................................................................................................... 63

Pinout and Packaging................................................................................................................................... 65

10.1 Pin Description........................................................................................................................................... 65

10.2 Package Drawings and Markings............................................................................................................... 67

Ordering Information..................................................................................................................................... 69

Revision History

Revision

Date

Owner

Description

1.0.2

15.1.2007

mlg,ptr

- Typ. Operating Characteristics: diagrams inserted

- Function testing for LEDs description updated

- Added dcdc converter block diagram

- Added ADC temp. calculation (was TBD)

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