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参数资料
| 型号： | MSC1201-xx |
| 厂商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | 60-Bit VFD Tube Driver with Digital Dimming and PWM Conversion Function |
| 中文描述： | 60位变频与数码管和PWM调光转换功能驱动程序 |
| 文件页数： | 13/20页 |
| 文件大小： | 135K |
| 代理商： | MSC1201-XX |
Semiconductor
MSC1201-xx
13/20
PWM Conversion
In the PWM conversion mode, "lamp PWM", which is used for dimming control of back-light for
instrument clusters or other displays, is used to generate the PWM signal for VFD tube dimming
control. The lamp PWM input to "PWM IN" pin is converted to PWM signal for VFD tube with
a built-in PWM conversion look-up table (User-Programmable Mask ROM).
The duty
cycle of the lamp PWM is defined as follows:
A
PWMIN
B
5V
PWM Input Frequency = 256 ± 80Hz
Duty Cycle = A / (A+B)
Note:
The duty cycle of the lamp PWM signal is measured with a reference point of 2.5 V typ.
As the reference point of 2.5 V is the threshold voltage of "PWM IN" pin, it deviates to
some value between 0.8 V and 3.8 V due to process parameter deviation. Therefore, the
PWM conversion error increases as the rise/fall time of the lamp PWM increases.
GRID/SEG Driver Operation and Digital/Analog Dimming Operation
Figure 6 shows an output timing of the GRID and SEG Driver when the VK is "H" level.
Output timings of the GRID and SEG drivers are shown in figure 7 for the digital dimming mode
operation in figure 8 for the PWM conversion mode operation.
(1) GRID and SEG drivers output timings when VK = "H"
GRID1
GRID2
SEG1-30
1 Frame (4096-bit times)
f
FR
16-bit times
2032-bit times
6-bit times
2038-bit times
10-bit times
Fig. 6 GRID and SEG Output Timing (VK = "H")
Note:
One bit time = 2/f
OSC
= 1
m
s typ.
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