GMZAN3 Datasheet, PDF (45/53 Pages) List of Unclassifed Manufacturers – XGA ALALOG INTERFACE LCD MONITOR CONTROLLER

gmZAN3 Preliminary Data Sheet
4.16 Miscellaneous Functions
4.16.1 Low Power State
The gmZAN3 provides a low power state in which the clocks to selected parts of the chip may be disabled (see
Table 22) and the ADC powered-off.
4.16.2 Pulse Width Modulation (PWM) Back Light Control
Many of today’s LCD back light inverters require both a PWM input and variable DC voltage to
minimize flickering (due to the interference between panel timing and inverter’s AC timing), and adjust
brightness. Most LCD monitor manufactures currently use a microcontroller to provide these control
signals. To minimize the burden on the external microcontroller, the gmZAN3 generates these signals
directly.
There are two pins available for controlling the LCD back light, PWM0/GPIO0 and PWM1/GPIO1. The
duty cycle of these signals is programmable. They may be connected to an external RC integrator to
generate a variable DC voltage for a LCD back light inverter or other applications. Panel HSYNC or
TCLK may be used as the clock for the counter generating this output signal.
C0523-DAT-01G
45
Genesis Microchip Confidential
http://www.genesis-microchip.com
July 2003