NT7501 Ver la hoja de datos (PDF) - Novatek Microelectronics

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Fabricante

NT7501

33 X 100 RAM-Map LCD Controller/Driver

Novatek Microelectronics 

NT7501

Command Sequence when Built-in Power Supply is Turned OFF

To turn off the built-in power supply, follow the command sequence as shown below after setting the system to standby mode.

Static Indicator ON

Display OFF

Entire Display ON

Command ADH

} Command AEH

Power Save

Command

Command A5H

Built-in Power OFF

Reset Circuit

When the RES input goes low, this LSI is initialized.

Initialized status

1. Display OFF

2. Normal display

3. ADC select: Normal display (ADC command D0 = low)

4. Read modify write OFF

5. Power control register (D2, D1, D0) = (0, 0, 0,)

6. Register data clear in serial interface

7. LCD power supply bias ratio 1/6

8. Static indicator: OFF

9. Display start line register set at line 1

10. Column address counter set at address0

11. Page address register set at page 0

12. Output status register (D3) = (0)

13. Electronic control register set at 0

14. Test command OFF

As seen in Figure 8 Microprocessor Interface (Reference Example). Connect the RES pad to the reset pin of the

microprocessor and initialize the microprocessor at the same time.

In case the NT7501 does not use the internal LCD power supply circuit, the RES must be low when the external LCD power

supply is turned on.

When RES goes low, each register is cleared and set to the above initialized status. However, it has no effect on the oscillator

circuit and output pads (FR, CL, DYO, D0 to D7)

The initialization by RES pad signal is always required during power-on. If the control signal from the MPU is HZ, an

overcurrent may flow through the IC. A protection is required to prevent the HZ signal at the input pads during power-on.

Be sure to initialize it by RES pad when turning on the power supply. When the reset command is used, only parameters 8 to

14 in the above initialization are executed.

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