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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
First Prev 11 12 13 14 15 16 17 18 19
ML145026, ML145027, ML145028
LANSDALE Semiconductor, Inc.
NO
HAS
THE TRANSMISSION
BEGUN?
YES
DOES
THE ADDRESS
MATCH THE
ADDRESS
PINS?
YES
DISABLE VT ON THE 1ST
NO
ADDRESS MISMATCH
AND IGNORE THE REST
OF THIS WORD
IS
THIS AT LEAST
THE 2ND CONSECUTIVE
NO
MATCH SINCE VT
DISABLE?
YES
ACTIVATE VT
HAVE
YES
4–BIT TIMES
PASSED?
NO
DISABLE VT
NO
HAS A
NEW TRANSMISSION
BEGUN?
YES
Figure 14. ML145028 Flowchart
Page 12 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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