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ST7FLCD1 bảng dữ liệu(PDF) 45 Page - STMicroelectronics

tên linh kiện ST7FLCD1
Giải thích chi tiết về linh kiện  8-bit MCU for LCD Monitors with 60 KBytes Flash,2 KBytes RAM, 2 DDC Ports and Infrared Controller
PDF  95 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST7FLCD1 bảng dữ liệu(HTML) 45 Page - STMicroelectronics

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ST7FLCD1
PWM Generator
Equations:
This Pulse Width modulated signal must be filtered, using an external RC network placed as close
as possible to the associated pin. This provides an analog voltage proportional to the average
charge through the external capacitor. Thus for a higher mark/space ratio (High time much greater
than Low time) the average output voltage is higher. The external components of the RC network
should be selected for the filtering level required for control of the system variable.
With:
REXT = 1 kΩ
fPWM = fCPU / (256 - ARR)
fCPU = 8 MHz
VDD = 5 V
Worst case, PWM Duty Cycle 50%
Table 16: Pulse WIdth in tCPU
Pulse WIdth in tCPU
DCR
≥ ARR
DCR - ARR + 1
DCR = ARR
1
DCR < ARR
0 (Output will not toggle)
Table 17: 8-bit PWM Ripple after Filtering
CEXT
VRIPPLE
470 nF
60 mV
1µF
27mV
4.7 µF
6 mV
Duty Cycle =
DCR + 1
256 - ARR
VRIPPLE =
(1 - e 1/(2 x CEXT x REXT x fPWM))2
|1 - e 1/(CEXT x REXT x fPWM)|
x VDD



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