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ST92185B Datasheet(PDF) 157 Page - STMicroelectronics

Part # ST92185B
Description  16K/24K/32K ROM HCMOS MCU WITH ON-SCREEN-DISPLAY
PDF  178 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST92185B Datasheet(HTML) 157 Page - STMicroelectronics

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ST92185B - 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 98. Typical PWM Output Filter
Figure 99. PWM Generation
Cext
OUTPUT
VOLTAGE
Rext
PWM OUT
1K
COUNTER
127
7-BIT PWM
VALUE
OVERFLOW
OVERFLOW
OVERFLOW
000
t
PWM OUTPUT
t
INTCLK/4 x 128



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