KS0093 datasheet(39/55 Pages) SAMSUNG

Part #	KS0093

Description	26 COM / 80 SEG DRIVER & CONTROLLER FOR STN LCD

PDF	55 Pages

Scroll/Zoom	100%

Manufacturer	SAMSUNG [Samsung semiconductor]

Direct Link	http://www.samsung.com/Products/Semiconductor

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39 / 55 page

26 COM / 80 SEG DRIVER & CONTROLLER FOR STN LCD

KS0093

VOLTAGE REGULATOR

The Voltage Regulator circuit is used to obtain an appropriate LCD panel driving voltage. This voltage is obtained

by adjusting resistors Ra and Rb as shown in equation (1) or (2), and by setting electronic contrast control data

bits, see equation (3) or (4).

The potential of V0 Pin can be adjusted within VOUT - VREF. VREF is the internal constant voltage source of the

chip and this value is 2.0V in the condition VDD

≥ 2.4V

The REF selects which voltage is used for voltage regulator between the external VEXT and the internal VREF.

Voltage regulation by adjusting resistors Ra, Rb

When REF is "Low"

When REF is "High"

V0 = ( 1 +

) x VREF --- (1)

V0 = ( 1 +

) x VEXT --- (2)

The internal VREF of voltage regulator has the temperature compensation function, and the temperature coefficient

is about 0.0%/

°C.

Inside Chip

GND

VEXT

VSS

VOUT

REF

VREF

Figure 19. Voltage Regulator Circuit

KS0093 Datasheet(PDF) 39 Page - Samsung semiconductor