16/31

¡ Semiconductor

MSM6665C-xx

FEDL6665C-02

Various Frequency Calculation Method

• Original Clock Frequency and Blink Frequency

Blink cycle calculation

From formula 1, the blink frequency can be calculated.

Example)

When the original clock frequency is 80kHz.

Clock cycle Ts=12.5[

µs]

From formula 1,

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 Formula 2,3 the blink frequency can be calculated.

Example)

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

Clock cycle Ts=12.5 [

µs]

From formula 3,

Thus,

Frame frequency = 73.5 [Hz]