AS3693C-9 Datasheet, PDF (1/30 Pages) ams AG – SPI interface

AS3693C
austriamicrosystems
Product Specification, Confidential
AS3693C–9 Channel high precision LED driver for LCD
Backlight
1 General Description
The AS3693C is a 9 channels high precision LED
controller with build in PWM generators for driving
external FETs in LCD-backlight panels.
External clock and synchronizing inputs allow the
synchronization of the LCD backlight with the TV
picture. Local dimming and scan dimming is
supported by 9 independent PWM generators with
programmable delay, period and duty cycle. Three
free configurable dynamic power feedback circuits
make the device usable for white LED as well as
RGB backlights. Build in safety features include
thermal shutdown as well as open and short LED
detection. All circuit parameters are programmable
via I2C or SPI interface.
2 Key Features
9 Channel LED driver
Output current only limited by external
transistor
Output voltage 0.4V to 50V
Absolute current accuracy +/- 0.5%
Output slew rate programmable
Current programmable with external resistor
Linear current control with 8 - bit DAC
Linear current control with external analog
voltage
Digital current control with 9 independent PWM
generators
Free programmable 12 bit resolution ( period,
high time and delay )
Overvoltage detection ( short LED )
Undervoltage detection ( open LED )
Temperature shutdown
Fault interrupt output
H-Sync, V-Sync inputs to synchronize with TV-
set
Internal or external PWM – clock
I2C interface
SPI interface
5 bit device - address (sets device address
and interface mode)
Automatic supply regulation feedback
Each output can be assigned to red, green or
blue feedback.
Package LQFP44 LD 10x10mm
3 Applications
• LED backlighting for LCD – TV sets and
monitors
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Revision 1.4 / 2009-08-13
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