Electronic Components Datasheet Search
  English  ▼

X  

Preview PDF HTML

ST92185B2 Datasheet(PDF) 157 Page - STMicroelectronics

Part # ST92185B2
Description  16K/24K/32K ROM HCMOS MCU WITH ON-SCREEN-DISPLAY
PDF  178 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST92185B2 Datasheet(HTML) 157 Page - STMicroelectronics

Back Button ST92185B2 Datasheet HTML 153Page - STMicroelectronics ST92185B2 Datasheet HTML 154Page - STMicroelectronics ST92185B2 Datasheet HTML 155Page - STMicroelectronics ST92185B2 Datasheet HTML 156Page - STMicroelectronics ST92185B2 Datasheet HTML 157Page - STMicroelectronics ST92185B2 Datasheet HTML 158Page - STMicroelectronics ST92185B2 Datasheet HTML 159Page - STMicroelectronics ST92185B2 Datasheet HTML 160Page - STMicroelectronics ST92185B2 Datasheet HTML 161Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 157 / 178 page
background image
157/178
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



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100  ...More


Datasheet Download

Go To PDF Page


Link URL



Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link to Datasheet    |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com