參數(shù)資料
型號(hào): SC41343P
廠商: MOTOROLA INC
元件分類: 消費(fèi)家電
英文描述: Encoder and Decoder Pairs
中文描述: SPECIALTY CONSUMER CIRCUIT, PDIP16
封裝: PLASTIC, DIP-16
文件頁(yè)數(shù): 10/20頁(yè)
文件大?。?/td> 233K
代理商: SC41343P
MC145026
MC145027
MC145028
SC41343
SC41344
10
MOTOROLA
RS
CTC
RTC
11
12
13
INTERNAL
ENABLE
Figure 9. Encoder Oscillator Information
This oscillator operates at a frequency determined by the
external RC network; i.e.,
f
1
2.3 RTC CTC
(Hz)
for 1 kHz
f
400 kHz
where: CTC
= CTC + Clayout + 12 pF
RS
2 RTC
RS
20 k
RTC
10 k
400 pF < CTC < 15
μ
F
The value for RS should be chosen to be
2 times RTC. This range ensures
that current through RS is insignificant compared to current through RTC. The
upper limit for RS must ensure that RS x 5 pF (input capacitance) is small com-
pared to RTC x CTC.
For frequencies outside the indicated range, the formula is less accurate.
The minimum recommended oscillation frequency of this circuit is 1 kHz. Sus-
ceptibility to externally induced noise signals may occur for frequencies below
1 kHz and/or when resistors utilized are greater than 1 M
.
Figure 10. Timing Diagram
PWmin
TE
2 WORD TRANSMISSION
ENCODER
CONTINUOUS TRANSMISSION
ENCODER
OSCILLATOR
(PIN 12)
Dout
(PIN 15)
VT
(PIN 11)
DATA OUTPUTS
1.1 (R2C2)
DECODER
ENCODING SEQUENCE
1ST
DIGIT
HIGH
2ND WORD
1ST WORD
OPEN
LOW
9TH
DIGIT
9TH
DIGIT
1ST
DIGIT
2
4
6
1
1
2
2
2
2
2
3
8
8
8
8
8
9
1
1
1
1
1
1
1
1
1
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