B69000 Asiliant Technologies, B69000 Datasheet - Page 324

• Manufacturer Part Number: B69000
• Manufacturer: Asiliant Technologies

Specifications of B69000

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Panel Power Sequencing
C-1
Appendix C
Panel Power Sequencing
Flat panel displays are extremely sensitive to conditions where full biasing voltage VEE is applied to the
liquid crystal material without enabling the control and data signals to the panel. This results in severe
damage to the panel and may disable the panel permanently.
The graphics controller provides a simple method to provide or remove power to the flat panel display in a
sequence of stages when entering various modes of operation to conserve power and provide safe
operation to the flat panel.
Three pins called ENAVEE, ENAVDD and ENABKL are provided to regulate the LCD Bias Voltage (VEE),
the driver electronics logic voltage (VDD), and the backlight voltage (BKL) to provide intelligent power
sequencing to the panel. The delay between each stage in the sequence is programmable via the Panel
Power Sequencing Delay Register (FR04).
The graphics controller performs the ‘panel off’ sequence when the STNDBY# input becomes low, or if bit
3 of the Power Down Control 1 Register (FR05) is set to 1. Conversely, the graphics controller performs
the ‘panel on’ sequence when the STNDBY# input becomes high, or if bit 3 of the Power Down Control 1
Register (FR05) is set to 0.
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69000 Databook
Subject to Change Without Notice
Revision 1.3 8/31/98