UM3750 UMC Corporation, UM3750 Datasheet

UM3750

Manufacturer Part Number

UM3750

Description

Programmable Encoder/Decoder

Manufacturer

UMC Corporation

Datasheet

1.UM3750.pdf (5 pages)

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Pin Configurations

code Transmitter-Receiver system. Working in the trans-

and transmit 12 bits of input.

compared to the local code In a sequential manner

an error

General Description

T h e U M 3 7 5 0 E n c o d e r / D e c o d e r

mit (encoder) mode, the UM3750 will sequentially encode

be 1 or 0 to allow 4096 different codes.

In the

3V to 11 V operation.

Single chip contains both Encoder and Decoder.

On chip oscillator uses non-critical RC components.

Cross interference of recetver is virtually eliminated

each within 64ms of the other.

by circuitry which requires 4 valid words to be received,

receive (decoder)

detected the system will reset and beain its

mode, the incoming signal is

Each of the 12 bits may

is a CMOS/LSI digital

T X / R X O U T P U T

“cc

RECEIVER INPUT

MODE SELECT

“ s s

A12

A l l

R.C INPUT

A 1 0

O n c e

2 - 3

comparison on the next word.

correctly, a “valid” signal is generated. This signal clears a

64ms counter and triggers a 3-stage counter. The 3-stage

counter counts the “valid” pluses and when 4 pulses have

been detected, the TX/RX output pin goes low. After the

TX/RX output pin goes low, the next “valid” must be

received within 128ms, giving a one valid in 6 requirement

to keep the TX/RX output pin.

Schmitt Trigger input provides excellent noise immunity.

Applications.

cordless telephone, remote control.

and demodulators

Interfaces with RF, ultrasonic, or infrared modulators

alarm control system, security system

E n c o d e r / D e c o d e r

Programmable

“cc

TX/RX

RECEIVER INPUT

MODE SELECT

R.C. INPUT

A12

A l l

A 1 0

If all 12 bits are received

“SS

UN13750

OUTPUT

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UM3750 Summary of contents

Page 1

... General Description code Transmitter-Receiver system. Working in the trans- mit (encoder) mode, the UM3750 will sequentially encode and transmit 12 bits of input. Each of the 12 bits may allow 4096 different codes. ...

Page 2

Block Diagram R.C.INPUT - - - - - - - RID CPCLK COMPARATOR MXCLKR MXD Block Diagram Description CLK of Comparator CPCLK WXCLKR: CLK of Multiplexer when in Receiver mode WXCLKT ...

Page 3

... Vcc capacttor 2lRC. The ground pin of the UM3750. This pin changes the this pin the ...

Page 4

... _____ tiz = =-~ - Connection Diagram for Transmitter/Receiver Output Waveform (based on 100 KHz) Typical UM3750 ...

Page 5

Decoder Flowchart Stand Count - Count +1 TX//RX TX,‘RX Ordering Information Reset Count No R eset 64m s, 128ms, Timer _!:_I- No Activates the ...

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