Rev. 1.00

5

May 07, 2012

HT62104

Frame Data Format On DOUT Pin

• AoneFramedataformatisshownbelow.

S2

S1

S0

C1

C2

D6

D5

D4

D3

D2

D1

D0

Delay time

(32ms)

One frame

(12 bits )

Start code

Custom codeData code

Press key

DOUT

• ThetimedurationbetweenFrame(n)andFrame(n+1)iscalledtheSignalGapTime.TheGapTimeiscounted

basedonaunitperiod,denotedas“T”.

kHz

455

1

192

4

4

T

1×

×

=

λ

=

≈

kHz

38

1

16

4 ×

×

– FortheHT62104device,theSignalGapTimeis4T.

Delay time(32ms)

Frame14TFrame2

Press key

Frame34TFrame4

4T

Release key

DOUT

S

C

D

S

C

D

S

C

D

S

C

D

Gap Time

Gap Time

Gap Time

Carrier Output Waveform

Thecarriersignal,withafrequencyof38kHz,issuperimposedontotheoutputdatasignalwhichisusedto

generateanddata0anddata1waveforms.Thecarriersignalisshowninthefollowingdiagram.

26 .3µs

8.77 µs

38 KHz carrier

DOUT Pin Bit Code Waveforms

Asbitscanbedesignatedaseither“0”or“1”,theymustbeencodedinacertainwayasshownbelow.

λ

Bit “0”

Bit “1”

38 kHz

3λ

λ

3λ

Note:1.

kHz

455

1

192

1

×

=

λ

≈

kHz

38

1

16 ×

2.Bit“1”consistsofa“high”pulsefor1λanda“38kHzcarrier”for3λ.

3.Bit“0”consistsofa“high”pulsefor3λanda“38kHzcarrier”for1λ.