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ML9040 Datasheet(PDF) 33 Page - OKI electronic componets |
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ML9040 Datasheet(HTML) 33 Page - OKI electronic componets |
33 / 47 page ML9040-Axx/-Bxx ¡ Semiconductor 33 Interface with LCD and MSM5259 Display examples when setting the 5 x 7 dots character font 1-line mode, 5 x 10 dots character font 1-line mode, and 5 x 7 dots character font 2-line mode through instructions are shown in Figures 4, 5, and 6, respectively. When the 5 x 7 dots character font is set in the 1-line display mode, the COM signals COM9 to COM16 are output for extinguishing. Likewise, when the 5 x 10 dots character font (1-line is set), the COM signals COM12 to COM16 are output for display-off. The display example shows a combination of 16 characters (32 characters for the 2-line display mode) and the LCD. When the number of MSM5259s are increased according to the increase in the number of characters, it is possible to display a maximum of 80 characters. Besides, it is necessary to generate bias voltage required for LCD operation by splitting resistors outside the IC to input it to ML9040-Axx/-Bxx and MSM5259. Examples of these bias voltages are shown in Figures 7, 8, 9, and 10. Basically, this can be done by dividing the voltage by the resistors as shown in Figures 7 and 8. If the value of resistor R is made larger to reduce system power consumption, the LCD operating margin decreases and the LCD driving waveform is distorted. To prevent this, a by-pass capacitor is serially connected to the resistor to lower voltage division impedance caused by the splitting of resistors as shown in Figures 9 and 10. As the values of R, VR, and C vary according to the LCD size used and VLCD (LCD drive voltage), these values have to be determined through actual experimentation in combination with the LCD. (Example set values: R = 3.3 to 10kW, VR = 10 to 30kW, and C = 0.0022 mF to 0.047 mF) Figure 17 shows an application circuit for the ML9040-Axx/-Bxx and MSM5259 including a bias circuit. The bias voltage has to maintain the following potential relation: VDD > V1 > V2 ≥ V3 > V4 > V5 Figure 4 • In the case of 1-line 16 characters display (5 x 7 dots/font) COM1 SEG1 SEG40 O1 O40 ML9040-Axx/-Bxx/-Cxx/-Dxx DO CP DF L DI1 CP MSM5259 DF LOAD DO20 DI21 LCD COM8 |
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