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ML145027EP Просмотр технического описания (PDF) - Unspecified

Номер в каталогеML145027EP ETC
Unspecified 
Компоненты ОписаниеEncoder and Decoder Pairs CMOS


ML145027EP Datasheet PDF : 19 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
ML145026, ML145027, ML145028
LANSDALE Semiconductor, Inc.
RS
11
CTC
RTC
12
13
INTERNAL
ENABLE
This oscillator operates at a frequency determined by the
external RC network; i.e.,
f
1
(Hz)
2.3 RTC CTC
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.
Figure 9. Encoder Oscillator Information
TE
ENCODER
OSCILLATOR
(PIN 12)
Dout
(PIN 15)
PWmin
VT
(PIN 11)
DATA OUTPUTS
ENCODER
2 WORD TRANSMISSION
CONTINUOUS TRANSMISSION
1ST
DIGIT
9TH
DIGIT
HIGH
OPEN
LOW
1ST WORD
ENCODING SEQUENCE
DECODER
1ST
DIGIT
9TH
DIGIT
2ND WORD
1.1 (R2C2)
Figure 10. Timing Diagram
Page 9 of 19
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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 transmission (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 consecutively 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

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