HT16C21 datasheet(14/34 Pages) HOLTEK

Part #	HT16C21

Description	RAM Mapping 204 / 168 LCD Driver Controller

PDF	34 Pages

Scroll/Zoom	100%

Manufacturer	HOLTEK [Holtek Semiconductor Inc]

Direct Link	http://www.holtek.com

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14 / 34 page

Rev. 1.00

November 22, 2011

HT16C21

Internal VLCD Voltage Adjustment

● The internal VLCD adjustment contains four resistors in series and a 4-bit programmable analog switch which

can provide sixteen voltage adjustment options using the VLCD voltage adjustment command.

● The internal VLCD adjustment structure is shown in the diagram:

LCD Bias

generator

VLCD pin

IVA

VDD

● The relationship between the programmable 4-bit analog switch and the VLCD output voltage is shown in the

table:

DA3~DA0

Bias

1/3

1/4

Note

00H

1.000*VDD

Default value

01H

0.944*VDD

0.957*VDD

02H

0.894*VDD

0.918*VDD

03H

0.849*VDD

0.882*VDD

04H

0.808*VDD

0.849*VDD

05H

0.771*VDD

0.818*VDD

06H

0.738*VDD

0.789*VDD

07H

0.707*VDD

0.763*VDD

08H

0.678*VDD

0.738*VDD

09H

0.652*VDD

0.714*VDD

0AH

0.628*VDD

0.692*VDD

0BH

0.605*VDD

0.672*VDD

0CH

0.584*VDD

0.652*VDD

0DH

0.565*VDD

0.634*VDD

0EH

0.547*VDD

0.616*VDD

0FH

0.529*VDD

0.600*VDD

HT16C21 Datasheet(PDF) 14 Page - Holtek Semiconductor Inc

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