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PDF ( 数据手册 , 数据表 ) ML145028

零件编号 ML145028
描述 (ML145026 - ML145028) Encoder and Decoder Pairs
制造商 LANSDALE Semiconductor
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ML145028 数据手册, 描述, 功能
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ML145026
ML145027
ML145028
Encoder and Decoder Pairs
CMOS
Legacy Device: Motorola/Freescale MC145026, MC145027, MC145028
These devices are designed to be used as encoder/decoder pairs in remote
control applications.
The ML145026 encodes nine lines of information and serially sends this
information upon receipt of a transmit enable (TE) signal. The nine lines
may be encoded with trinary data (low, high, or open) or binary data (low
or high). The words are transmitted twice per encoding sequence to
increase security.
The ML145027 decoder receives the serial stream and interprets five of
the trinary digits as an address code. Thus, 243 addresses are possible. If
binary data is used at the encoder, 32 addresses are possible. The remaining
serial information is interpreted as four bits of binary data. The valid trans-
mission (VT) output goes high on the ML145027 when two conditions are
met. First, two addresses must be consecutively received (in one encoding
sequence) which both match the local address. Second, the 4 bits of data
must match the last valid data received. The active VT indicates that the
information at the Data output pins has been updated.
The ML145028 decoder treats all nine trinary digits as an address which
allows 19,683 codes. If binary data is encoded, 512 codes are possible. The
VT output goes high on the ML145028 when two addresses are consecu-
tively received (in one encoding sequence) which both match the local
address.
• Operating Temperature Range: TA = – 40 to + 85°C
• Very–Low Standby Current for the Encoder: 300 nA Maximum @ 25°C
• Interfaces with RF, Ultrasonic, or Infrared Modulators and Demodulators
• RC Oscillator, No Crystal Required
• High External Component Tolerance; Can Use ± 5% Components
• Internal Power–On Reset Forces All Decoder Outputs Low
• Operating Voltage Range: ML145026 = 2.5 to 18 V*
ML145027, ML145028 = 4.5 to 18 V
• For Infrared Applications, See Application Note AN1016/D
16
1
16
1
P DIP 16 = EP
PLASTIC DIP
CASE 648
SO 16 = -5P
SOG PACKAGE
CASE 751B
16
1
SO 16W = -5P
SOG PACKAGE
CASE 751G
CROSS REFERENCE/ORDERING INFORMATION
PACKAGE
MOTOROLA
LANSDALE
P DIP 16
SO 16
P DIP 16
SO 16
P DIP 16
SO 16
MC145026P
MC145026D
MC145027P
MC145027DW
MC145028P
MC145028DW
ML145026EP
ML145026-5P
ML145027EP
ML145027-5P
ML145028EP
ML145028-5P
Note: Lansdale lead free (Pb) product, as it
becomes available, will be identified by a part
number prefix change from ML to MLE.
ML145026
ENCODER
A1
A2
A3
A4
A5
A6/D6
A7/D7
1
2
3
4
5
6
7
16 VDD
15 Dout
14 TE
13 RTC
12 CTC
11 RS
10 A9/D9
VSS 8
9 A8/D8
PIN ASSIGNMENTS
ML145027
DECODERS
A1 1
A2 2
16 VDD
15 D6
A3 3
A4 4
14 D7
13 D8
A5 5
R1 6
C1 7
VSS 8
12 D9
11 VT
10 R2/C2
9 Din
ML145028
DECODERS
A1 1
A2 2
16 VDD
15 A6
A3 3
A4 4
14 A7
13 A8
A5 5
12 A9
R1 6
C1 7
VSS 8
11 VT
10 R2/C2
9 Din
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ML145028 pdf, 数据表
ML145026, ML145027, ML145028
www.DataSheet4U.com
LANSDALE Semiconductor, Inc.
acknowledged; a trinary open at the ML145026 encoder is
decoded as a high level (logic 1).
Din
Data In (Pin 9)
This pin is the serial data input to the decoder. The input
voltage must be at CMOS logic levels. The signal source driv-
ing this pin must be DC coupled.
R1, C1
Resistor 1, Capacitor 1 (Pins 6, 7)
As shown in Figures 2 and 3, these pins accept a resistor and
capacitor that are used to determine whether a narrow pulse or
wide pulse has been received. The time constant R1 x C1
should be set to 1.72 encoder clock periods:
R1 C1 = 3.95 RTC CTC
R2/C2
Resistor 2/Capacitor 2 (Pin 10)
As shown in Figures 2 and 3, this pin accepts a resistor and
capacitor that are used to detect both the end of a received
word and the end of a transmission. The time constant R2 x C2
should be 33.5 encoder clock periods (four data periods per
Figure 11): R2 C2 = 77 RTC CTC. This time constant is used
to determine whether the Din pin has remained low for four
data periods (end of transmission). A separate on–chip com-
parator looks at the voltage–equivalent two data periods (0.4
R2 C2) to detect the dead time between received words within
a transmission.
VT
Valid Transmission Output (Pin 11)
This valid transmission output goes high after the second
word of an encoding sequence when the following conditions
are satisfied:
1. the received addresses of both words match the local
de-coder address, and
2. the received data bits of both words match.
VT remains high until either a mismatch is received or no
input signal is received for four data periods.
VSS
Negative Power Supply (Pin 8)
The most–negative supply potential. This pin is usually
ground.
VDD
Positive Power Supply (Pin 16)
The most–positive power supply pin.
Page 8 of 19
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ML145028 equivalent, schematic
ML145026, ML145027, ML145028
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LANSDALE Semiconductor, Inc.
SEND
MC 14011UB
SELECT FOR
200 mA TO 300 mA
MLED81
USE OF 2 MLED81s
IS OPTIONAL
10 k
MPSA13
OR
MPSW13
TE Dout
ML 145026
RS CTC RTC
9 1000 pF
MC 14011UB
220 k
SWITCHES
220 k
100 kFOR APPROX. 4 kHz
47 kFOR APPROX. 9 kHz
0.01 µF
ADJUST/SELECT FOR
f = 50 kHz (APPROX. 100 k)
F igure 18. IR E D Trans mitter Us ing R C Os c illator to G enerate C arrier F requenc y
V+
1M
X1
MC 14011UB
MC 14024
CLK
RESET
Q3
50 kHZ TO
DRIVER
TRANSISTOR
X1 = 400 kHz CERAMIC RESONATOR
PANASONIC EFD–A400K04B
OR EQUIVALENT
V+
MC 14011UB
470 pF
470 pF
Dout
FROM ML145026
F igure 19. Us ing a C eramic R es onator to G enerate C arrier F requenc y
Page 16 of 19
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