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參數(shù)資料
| 型號： | LC75741W |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | 1/2 Duty VFD Driver for Frequency Displays(用于電子調(diào)諧頻率顯示的1/2占空VFD顯示驅(qū)動器) |
| 中文描述： | 1 / 2占空比VFD驅(qū)動頻率顯示器（用于電子調(diào)諧頻率顯示的1 / 2占空變頻顯示驅(qū)動器） |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 157K |
| 代理商： | LC75741W |
Relation between Segment and Digit Outputs
Figure 4
Description
1. Consider the examples shown in Figure 4, where data is set up so that the segment outputs S1 to S53 output a low
level on the G1 digit output timing and a high level on the G2 digit output timing. (Here, the G2 side being lighted)
2. The waveforms for G1 and G2 in example 1 are output when the 10 bits of dimmer data (DM0 to DM9) are set to
3FE
H
. The relation between t1 and the oscillator frequency f
OSC
is:
t1 = 2/f
OSC
For example, if f
OSC
is 1.6 [MHz]:
t1 = 2/1.6 [MHz] = 1.25 [μs]. Note that t1 and t2 will be the same period in example 1.
3. The waveforms for G1 and G2 in example 2 are those when the dimmer data (DM0 to DM9) are set to a smaller
value. Although the time t1, which is from the point where digit output falls to segment output changes, does not
change, the time t2, which is from the point where segment output changes to the time the digit output rises, becomes
longer. When the dimmer data (DM0 to DM9) are set to 0FF
H
and f
OSC
is 1.6 [MHz],
the frame frequency f
frame
= 1/(t3
×
2)
= f
OSC
/4096
= 391 [Hz],
and t3 = 1.28 [ms].
(1.28 [ms] – 1.25 [μs]
×
2)
×
(3FF
H
– 0FF
H
)
1023
Therefore, t2 =
= 0.96 [ms].
4. When the dimmer data (DM0 to DM9) are set to an even smaller value, the time t2, which is from the point where
segment output changes to the time the digit output rises, becomes even longer, as in example 3. Note that t1 does
not change here, either.
No. 4965-8/10
LC75741E, 75741W
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