HT16L21 datasheet(27/36 Pages) HOLTEK

27 / 36 page

Rev. 1.00

November 16, 2011

HT16L21

Internal Voltage Adjustment (IVA) Setting Command

Theinternalvoltage(VLCD)adjustmentcanprovidesixteenkindsofregulatorvoltageadjustmentoptionsbysetting

theLCDoperatingvoltageadjustmentcommand.

Function

Byte (MSB)

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1

(LSB)

Bit0

Note

R/W Def

Internal voltage

adjustment

(IVA) Setting

1st

—

Internal voltage

adjust control

2nd

V2 V1

● The “VE” bit is used to

enable or disable the internal

regulator adjustment for the

LCD voltage.

● The V3~V0 bits can be used

to adjust the VLCD voltage.

W 00H

Note:

Regulator Adjustment

Off – bias voltage is supplied from VLCD pin

On – bias voltage is supplied from the internal regulator

Regulator Output Voltage (V)

3.0V

3.2V

3.3V

3.4V

4.4V

4.5V

4.6V

5.0V

● Power on status: Disable the internal regulator.

● When the VLCD voltage is lower than 3.5V, it is recommended to disable the internal regulator so that the VLCD

voltage is directly connected to the internal bias voltage generator.

● Caution: Use the internal regulator when the “Regulator output voltage<VLCD−0.5V”

● If the programmed command is not defined, the function will not be affected.

HT16L21 Datasheet(PDF) 27 Page - Holtek Semiconductor Inc

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