參數(shù)資料
型號(hào)： NT6861
廠商： Electronic Theatre Controls, Inc.
英文描述： 8-Bit Microcontroller for Monitor
中文描述： 8位微控制器的監(jiān)控
文件頁(yè)數(shù)： 13/44頁(yè)
文件大小： 455K
代理商： NT6861
NT6861
13
7. PWM DACs (Pulse Width Modulation D/A Converters)
There are 14 PWM D/A converters with 8-bit resolution in NT6861. Eight of these D/A (DAC0 - DAC7) converters are open-
drain output structures with 12V applied (maximum), and the other six D/A converters (DAC8 - DAC13) are
open-drain output structures with 5V applied (maximum). The PWM frequency is 31.25 KHz on 8 MHz system clock. Use of a
different oscillator frequency will result in different PWM frequency. As DAC8 - DAC13 are shared with I/O port pins, user can
write '0' to corresponding enable bit in the ENDAC control register to activate each of DACH8 - 13. There are 14-channel
readable DACH registers corresponding to 14 D/A converters. Each PWM output pulse width is programmable by setting the 8
bit digital to the corresponding DACH registers. When these DACH registers are set to 00H, the DAC will output LOW (GND
level) and each bit addition will add 125ns pulse width. After reset, all DAC outputs are set to
80H (1/2
duty output
)
. Refer to
Figure 4 for the detailed timing diagram of PWM D/A output.
01
02
m
255 (FF)
8MHz Fosc
255
0
1
2
m
m+1
m+2
255
0
1
PWM value:
00
Figure 4. The DAC Output Timing Diagram and Wave Table
DKVL7
DKVL6
DKVL5
DKVL4
DKVL3
DKVL2
DKVL1
DKVL0
DAC Output Duty Cycle
0
0
0
0
0
0
0
0
GND
0
0
0
0
0
0
0
1
1/256 Vref.
0
0
0
0
0
0
1
0
2/256 Vref.
0
0
0
0
0
0
1
1
3/256 Vref.
0
0
0
0
0
1
0
0
4/256 Vref.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
X /256 Vref.
1
1
1
1
1
1
1
0
254/256 Vref.
1
1
1
1
1
1
1
1
255/256 Vref.
The DAC value correspondent to PWM Output
* Vref. is 12V or 5V
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