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MC145027DW bảng dữ liệu(PDF) 9 Page - LANSDALE Semiconductor Inc.

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Giải thích chi tiết về linh kiện  Encoder and Decoder Pairs
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Issue 0
LANSDALE Semiconductor, Inc.
ML145026, ML145027, ML145028
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 µF
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
Ω.
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


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