MSM6665-01GS-K Ver la hoja de datos (PDF) - Oki Electric Industry

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MSM6665-01GS-K

DOT MATRIX LCD CONTROLLER WITH 17-DOT COMMON DRIVER AND 80-DOT SEGMENT DRIVER

Oki Electric Industry 

¡ Semiconductor

MSM6665-xx

Method of Calculating Various Types of Frequencies

• Original Clock Frequency and Blink Frequency

Blink cycle calculation

([Original clock cycle] x 5) x 214 = Blink cycle ............................................. Formula 1

From formula 1, the blink frequency can be calculated.

Example) When the original clock is 80kHz:

Clock cycle Ts=12.5 [µs]

From formula 1,

Blink cycle Tb=(12.5 x 10-6 x 5) x 214 = 1.024 [s]

Thus,

Blink frequency = 1 [Hz]

• Original Clock Frequency and Frame Frequency

Frame cycle calculation

1/9 DUTY: (Original clock cycle) x 1152 = Frame cycle ............................. Formula 2

1/17 DUTY: (Original clock cycle) x 1088 = Frame cycle ........................... Formula 3

From formulas 2 and 3, the frame frequency can be calculated.

Example) In the original clock 80kHz and 1/17 DUTY specifications:

Clock cycle Ts=12.5 [µs]

From formula 3,

Frame cycle Tf=12.5 x 10-6 x 1088 = 13.6 [ms]

Thus,

Frame frequency = 73.5 [Hz]

16/30

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