Datasheet
ADP5520
Rev. A | Page 2 of 40
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Typical Operating Circuit ................................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
I
2
C Timing Specifications ............................................................ 4
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Pin Configuration and Function Descriptions ............................. 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ........................................................................ 9
Backlight Drive and Control ....................................................... 9
Backlight Operating Levels ....................................................... 10
Backlight Maximum and Dim Settings ................................... 10
Backlight Turn On/Off/Dim ..................................................... 11
Automatic Dim and Turn Off Timers ..................................... 11
Linear Backlight Fade In and Fade Out ................................... 12
Fade Override ............................................................................. 13
Advanced Fading (Square) ........................................................ 13
Advanced Fading (Cubic 1 and Cubic 2) ................................ 14
Ambient Light Sensing .............................................................. 14
Automatic Backlight Adjustment ............................................. 15
I/O Expansion Pins (GPIOs) .................................................... 15
I/O Expansion Pins (Keypad Matrix) ...................................... 15
I/O Expansion Pins and ILED Pin (Auxiliary LED Current
Sinks) ............................................................................................ 17
Interrupt Output (nINT) ........................................................... 19
Reset Input (nRST) .................................................................... 19
Communication Interface ............................................................. 20
Register Map ................................................................................... 21
Detailed Register Descriptions ..................................................... 22
Applications Information .............................................................. 34
Converter Topology ................................................................... 34
PCB Layout ................................................................................. 35
Example Circuits ............................................................................ 36
Outline Dimensions ....................................................................... 38
Ordering Guide .......................................................................... 38
REVISION HISTORY
1/10—Rev. 0 to Rev. A
Changes to Table 1 ............................................................................ 3
Changes to Table 5 ............................................................................ 6
Changes to Figure 32 ...................................................................... 14
Updated Outline Dimensions ....................................................... 38
Changes to Ordering Guide .......................................................... 38
7/08—Revision 0: Initial Version