AS3661 datasheet(3/87 Pages) AMSCO

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AS3661

Datasheet

Contents

1 General Description

............................................................................................................................ 1

2 Key Features

....................................................................................................................................... 1

3 Applications

........................................................................................................................................ 1

4 Pinout

................................................................................................................................................... 5

4.1 Pin Assignment

..............................................................................................................................................5

4.2 Pin Description

...............................................................................................................................................5

5 Absolute Maximum Ratings

............................................................................................................... 7

6 Electrical Characteristics

................................................................................................................... 8

7 Typical Operating Characteristics

................................................................................................... 12

8 Detailed Description

......................................................................................................................... 14

8.1 Programming

...............................................................................................................................................14

8.2 LED Error Detection

.....................................................................................................................................14

8.3 Energy Efficiency

.........................................................................................................................................14

8.4 Temperature Compensation

........................................................................................................................14

8.5 Modes of Operation

.....................................................................................................................................16

8.5.1 RESET .................................................................................................................................................16

8.5.2 STANDBY ............................................................................................................................................16

8.5.3 STARTUP ............................................................................................................................................16

8.5.4 NORMAL ..............................................................................................................................................16

8.5.5 POWER SAVE .....................................................................................................................................16

8.6 Charge Pump Operational Description

........................................................................................................17

8.6.1 Overview ..............................................................................................................................................17

8.6.2 Output Resistance ................................................................................................................................17

8.6.3 Controlling the Charge Pump ...............................................................................................................18

8.6.4 LED Forward Voltage Monitoring .........................................................................................................18

8.6.5 Gain Change Hysteresis ......................................................................................................................18

8.6.6 Automatic Power Save Mode ...............................................................................................................19

8.6.7 PWM Power Save Mode ......................................................................................................................19

8.7 LED Driver Operational Description

.............................................................................................................20

8.7.1 Powering LEDs ....................................................................................................................................21

8.7.2 Controlling the High-side LED Drivers ..................................................................................................21

8.8 I2C Compatible Control Interface

.................................................................................................................22

8.8.1 I

2C Address selection ...........................................................................................................................22

8.8.2 Bus Not Busy .......................................................................................................................................22

8.8.3 Start Data Transfer ...............................................................................................................................22

8.8.4 Stop Data Transfer ...............................................................................................................................22

8.8.5 Data Valid .............................................................................................................................................22

8.8.6 Acknowledge ........................................................................................................................................22

8.8.7 Program Downloading ..........................................................................................................................25

8.9 Register Set

.................................................................................................................................................25

8.10 Control Register Details

.............................................................................................................................35

8.10.1 ENABLE/ ENGINE CONTROL1 .........................................................................................................35

8.10.2 ENGINE CNTRL2 ..............................................................................................................................36

8.10.3 OUTPUT DIRECT/RATIOMETRIC MSB and LSB .............................................................................37

8.10.4 OUTPUT ON/OFF CONTROL MSB and LSB ....................................................................................38

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