NT7502 데이터 시트보기 (PDF) - Novatek Microelectronics

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NT7502

65 X 132 RAM-Map LCD Controller / Driver

Novatek Microelectronics 

NT7502

17. V0 Voltage Regulator Internal Resistor Ratio Set

This command sets the V0 voltage regulator internal resistor ratio. For details, see explanation under “The Power Supply

Circuits”.

A0 E R / W D7 D6 D5 D4 D3 D2 D1 D0

RD WR

01 0 00100000

001

010

:

110

111

Rb / Ra Ratio

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:

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18. The Electronic Volume (Double Byte Command)

This command makes it possible to adjust the brightness of the liquid crystal display by controlling the liquid crystal drive

voltage V0 through the output from the voltage regulator circuits of the internal liquid crystal power supply.

This command is a two-byte command used as a pair with the electronic volume mode set command and the electronic

volume register set command, and both commands must be issued one after the other.

! The Electronic Volume Mode Set

When this command is input, the electronic volume register set command is enabled. Once the electronic volume mode has

been set, no other command except the electronic volume register command can be used. Once the electronic volume

register set command has been used to set data into the register, then the electronic volume mode is released.

A0 E R / W D7 D6 D5 D4 D3 D2 D1 D0

RD WR

01 0 10000001

! Electronic Volume Register Set

By using this command to set six bits of data to the electronic volume register, the liquid crystal voltage V0 assumes one of

the 64 voltage levels.

When this command is input, the electronic volume mode is released after the electronic volume register has been set.

A0 E R / W D7 D6 D5 D4 D3 D2 D1 D0

RD WR

01 0 * *000000

01 0 * *000010

01 0 * *000011

01 0 **

:

01 0 * *111110

01 0 * *111111

V0

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:

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When the electronic volume function is not used, set D5 - D0 to 100000.

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