HT62104 HOLTEK [Holtek Semiconductor Inc], HT62104 Datasheet - Page 5

• Manufacturer Part Number: HT62104
• Description: Infrared Remote Encoder
• Manufacturer: HOLTEK [Holtek Semiconductor Inc]

Frame Data Format On DOUT Pin
Carrier Output Waveform
The carrier signal, with a frequency of 38kHz, is superimposed onto the output data signal which is used to
generate and data 0 and data 1 waveforms. The carrier signal is shown in the following diagram.
DOUT Pin Bit Code Waveforms
As bits can be designated as either “0” or “1”, they must be encoded in a certain way as shown below.
Note:1.
• A one Frame data format is shown below.
• The time duration between Frame (n) and Frame (n+1) is called the Signal Gap Time. The Gap Time is counted
Rev. 1.00
DOUT
38 KHz carrier
DOUT
based on a unit period, denoted as “T”.
Press key
Bit “1”
Bit “0”
– For the HT62104 device, the Signal Gap Time is 4T.
38 kHz
Press key
2. Bit “1” consists of a “high” pulse for 1λ and a “38kHz carrier” for 3λ.
3. Bit “0” consists of a “high” pulse for 3λ and a “38kHz carrier” for 1λ.
Delay time (32ms)
1
λ
=
Delay time
192
×
455
S
λ
1
kHz
( 32 ms )
Frame 1
C
≈
16 ×
D
38
S 2
8.77 µs
1
1
kHz
T
Gap Time
Start code
4T
=
3 λ
4
S 1
λ
Release key
=
S
4
×
S 0
Frame 2
192
C
26 .3µs
t
DW
×
Custom code
D
C 1
455
5
1
kHz
3 λ
Gap Time
One frame
C 2
4T
≈
4 ×
D 6
S
16
×
Frame 3
C
38
D 5
( 12
1
kHz
D
λ
bits )
D 4
Data code
Gap Time
4T
D 3
S
D 2
Frame 4
C
May 07, 2012
D
D 1
HT62104
D 0