參數(shù)資料
型號： ST92186B3BK
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP32
封裝： PLASTIC, SDIP-32
文件頁數(shù)： 29/148頁
文件大?。?/td> 1664K
代理商： ST92186B3BK
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ST92186B - VOLTAGE SYNTHESIS TUNING CONVERTER (VS)
VOLTAGE SYNTHESIS (Cont’d)
PWM Generation
The counter increments continuously, clocked at
INTCLK divided by 4. Whenever the 7 least signif-
icant bits of the counter overflow, the VS output is
set.
The state of the PWM counter is continuously
compared to the value programmed in the 7 most
significant bits of the tuning word. When a match
occurs, the output is reset thus generating the
PWM output signal on the VS pin.
This Pulse Width modulated signal must be fil-
tered, using an external RC network placed as
close as possible to the associated pin. This pro-
vides an analog voltage proportional to the aver-
age charge passed to 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 net-
work should be selected for the filtering level re-
quired for control of the system variable.
Figure 59. Typical PWM Output Filter
Figure 60. PWM Generation
Cext
OUTPUT
VOLTAGE
Rext
PWM OUT
1K
COUNTER
127
7-BIT PWM
VALUE
OVERFLOW
000
t
PWM OUTPUT
t
INTCLK/4 x 128
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