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PDF HT6230 Data sheet ( Hoja de datos )
| Número de pieza | HT6230 | |
| Descripción | Infrared Remote Encoder | |
| Fabricantes | Holtek Semiconductor Inc | |
| Logotipo |  |
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HT6230
Infrared Remote Encoder
Features
· Operating voltage: 2.4V~5.2V
· 32 system codes, each system with
64 command codes
· Programmable transmission codes
· Biphase transmission method
· Generated modulation output data
Applications
· Televisions and video cassette recorder
controllers
· Garage door controllers
General Description
The HT6230 is designed as infrared remote en-
coder, usually applied to TV systems. A total of
2048 different commands can be generated and
arranged into 32 systems where each system
contains 64 different commands. There are 96
Block Diagram
(1/2 system frequency and 1/4 duty cycle)
· Single pin oscillator
· 429kHz resonator system clock
· Test pins available
· 28-pin SOP package
· Car door controllers
· Security systems
· Other remote control systems
keys and to each key is assigned one program-
mable code. The code is programmable by mask
option. Legal and illegal key operation can be
distinguished.
O SC
RC
O SC
3 ´ 21
2 1 3 D iv id e r
P a r a lle l
T o S e r ia l
C o n v e rte r
T T 1 T est
TT2 M ode
R eset
A c tio n
G e n e ra to r
O u tp u t
S ta g e
CODE
MS
M ode
S e le c tio n
C o n tro l
U n it
M o d u la tio n
O u tp u t
S ta g e
M CODE
Z IN 3
Z -k e y
Z -k e y
E ncoder
PAL
Z IN 0
DRS7
X IN 7
X IN 0
X -k e y
E ncoder
X -k e y
PAL
C om m and
A nd
S y s te m
C o d e L a tc h
Z -D R S
PAL
X -D R S
PAL
K ey S can
D r iv e r
D ecoder
DRS0
VSS VDD
1 April 19, 2000
1 page  
HT6230
Functional Description
Key operation
When MS is low, the legal key operation is that
only one ZIN or XIN can be connected to one
DRS driver and if more than one XIN, ZIN or
both are pressed at the same time then the key
operation is recognized as illegal; hence, the os-
cillator will not start. When MS is high, the le-
gal key operation is that exactly one ZIN and
one XIN are connected to two DRS drivers and
other cases of key operation are all considered
as illegal.
However, when one XIN or ZIN is connected to
more than one DRS, the last key scan driver is
to generate output data code.
Format of transmission code
The output pin CODE transmits the data code
as a code format, as shown at the bottom figure.
The method of transmitting one code bit is called
biphase transmission and is represented by the
following fig:
lo g ic 0
lo g ic 1
Where one code bit time is 3´28´TOSC. The out-
put signal of the MCODE pin is the signal of the
generated output code modulated by 1/12 of the
system frequency with 1/4 duty cycle. In quies-
cent state both CODE and MCODE are high
impedance.
Key scan drivers
The key scan drivers DRS0 to DRS7 are open
drain NMOS and the outputs of these are all
low in quiescent state. When a legal key opera-
tion is detected, the debounce cycle starts and
at the end of the debounce cycle, the DRS out-
puts are high impedance. Furthermore, the
scanning cycle starts and DRS outputs take
turns to switch to low state.
Programmable output data code
The output data code corresponding to each key
is programmable by hardware mask option.
The PAL circuit is necessary for this purpose.
Operation mode
· One-key system mode
The device enters this mode by switching the
MS input pin to low state. The pull-high resis-
tors are connected to all XIN and ZIN inputs
so that all sense inputs are at high state, until
pulled to low state by key operation. In this
mode the legal key operation is that only one
ZIN or XIN can be connected to one DRS.
When a sense input detects a low level, an en-
able signal is generated to latch the system or
command latches. If the sense input belongs
to ZIN, the corresponding system code is gen-
erated and the command code is defined as all
one code
11
M SB
LS B M S B
LS B
D e b o u n c e c y c le
( 1 6 b it- tim e )
s ta rt
S can
c y c le
S ta rt
b its
C o n tro l
b it
5 s y s te m b its
6 c o m m a n d b its
C ode 1
1 6 b it- tim e
s ta rt
4 8 b it- tim e
R e p e titio n tim e ( 6 4 b it- tim e )
C ode 2
1 6 b it- tim e
Transmission code format
5 April 19, 2000
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet HT6230.PDF ] | |
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