Rev. 1.00

5

June 07, 2013

HT6P235A/HT6P245A

Functional Description

TheHT6P2x5Aencodestheaddresscodeanddataset

waveformisfedtotheRFmodulatorfortransmission.

Normal Operation

The HT6P2x5A series encodes and transmits

address/datatoadecoderuponreceiptofatrigger

signal.ThetransmissionfunctionoftheHT6P2x5A

seriesareenabledbythedatainputs,D0~D3withthe

–B0~B1pinsusingactivelowconditions.

D0~D3, B0

1ms

(typ.)

DOUT

Pilot

code Address/Data/End

code

ThetransmissionsequenceisPilot,Address,Data,

Endcode.

D0~D3, B0

< 1 pilot code

> 1 code word

1 code word

1pilot code < Active

< 1 code word

DOUT

Transmission Timing Diagram

1.1 Code bits

Acodebitisthebasiccomponentoftheencoded

waveform,andcanbeclassifiedaseitheranaddress/data

bitoraPilot-codewhichisasynchronousbit.

1.2 Address/Data bit waveform

Anaddress/databitcanbedesignatedaseitherbit”0”

or“1”ifitisinahighorlowstaterespectively.A

singlebitwaveformconsistsofthreepulsecycles,as

shownthediagram.

Bit “0”

1λ

2λ

Address/Data bit

1λ

2λ

Bit “1”

Note:1.Bit“0”consistsofa“low”pulsefor1λthen

changestoa“high”pulsefor2λ.

2.Bit“1”consistsofa“low”pulsefor2λthen

changestoa“high”pulsefor1λ.

1.3 Single-Bit Data Width

Thereare8differentsingle-bitdatawidthsasshown

inthetable,selected usingtheBTS1andBTS0

controlpins.

Symbol

Parameter

Pin Condition

Group1 Group2

Unit

Single bit data width

BTS1/BTS0

0/0

1.1

0.7

ms

0/Floating

1.2

0.8

0/1

1.3

0.9

Floating/0

1.4

1.0

Floating/ Floating

1.5

2.0

Floating/1

1.6

2.1

1/0

1.76

2.2

1/ Floating

1.9

2.3

1/1

NC

NC

—

Note:1.Group2isonlyavailableforHT6P235A.

2.TheBTS0andBTS1pinscanbesettoeither“1”,“0”or“Floating”.

3.TheBTS0andBTS1pinsmustnotbothbe“1”,thiscanresultinerroneousoperation.

4.Ifanoverlappingbittimesituationexiststhenchoosethenearesttimebitvalue.Forexampleifthe

desiredbittimeis1.46ms,thenachoiceof1.5msispreferred.