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PDF HT604L Data sheet ( Hoja de datos )
| Número de pieza | HT604L | |
| Descripción | 318 Series of Decoders | |
| Fabricantes | Holtek Semiconductor Inc | |
| Logotipo |  |
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HT604L/614/692
318 Series of Decoders
Features
· Operating voltage: 2.4V~12V
· Low power and high noise immunity CMOS
technology
· Low standby current
· Capable of decoding 18 bits of information
· Pairs with Holtek¢s 318 series of encoders
· 9~10 address pins
· 2~8 data pins
· Trinary address setting
Applications
· Burglar alarm system
· Smoke and fire alarm system
· Garage door controllers
· Car door controllers
General Description
The 318 decoders are a series of CMOS LSIs for
remote control system applications. They are
paired with the 318 series of encoders. For
proper operation, a pair of encoder/decoder pair
with the same number of address and data for-
mat should be selected (refer to the encoder/de-
coder cross reference tables).
The 318 series of decoders receive serial address
and data from that series of encoders that are
transmitted by a carrier using an RF or an IR
transmission medium. It then compares the se-
rial input data twice continuously with its local
address. If no errors or unmatched codes are
· Two times of receiving check
· Built-in oscillator needs only a 5% resistor
· Valid transmission indicator
· Easy interface with an RF or an infrared
transmission medium
· Minimal external components
· Package information: refer to Selection
Table
· Car alarm system
· Security system
· Cordless telephones
· Other remote control systems
encountered, the input data codes are decoded
and then transferred to the output pins. The VT
pin also goes high to indicate a valid transmis-
sion.
The 318 decoders are capable of decoding 18 bits
of information that consists of N bits of address
and 18-N bits of data. To meet various applica-
tions they are arranged to provide a number of
data pins whose range is from 0 to 8 and an ad-
dress pin whose range is from 8 to 18. In addi-
tion, the 318 decoders provide various
combinations of address/data number in differ-
ent packages.
1 April 24, 2000
1 page  
HT604L/614/692
Functional Description
Operation
The 318 series of decoders provide various com-
binations of address and data pins in different
packages. It is paired with the 318 series of
encoders. The decoders receive data transmit-
ted by the encoders and interpret the first N
bits of the code period as address and the last
18-N bits as data (where N is the address code
number). A signal on the DIN pin then acti-
vates the oscillator which in turns decodes the
incoming address and data. The decoders will
check the received address twice continuously.
If all the received address codes match the con-
tents of the decoder¢s local address, the 18-N
bits of data are decoded to activate the output
pins, and the VT pin is set high to indicate a
valid transmission. That will last until the ad-
dress code is incorrect or no signal has been re-
ceived. The output of the VT pin is high only
when the transmission is valid. Otherwise it is
always low.
Output type
There are two types of output to select from:
· Momentary type
The data outputs follow the encoder during a
valid transmission and then reset.
· Latch type
The data outputs follow the encoder during a
valid transmission, and are then latched in
this state until the next valid transmission
occurs.
Flowchart
P ow eron
S ta n d b y m o d e
N o C o d e in ?
Y es
D is a b le V T &
ig n o r e th e r e s t o f
th is w o r d
A d d r e s s b its
m a tc h e d ?
Y es
No
S to re d a ta
M a tc h
p r e v io u s s to r e d
d a ta ?
Y es
No
No
2 tim e s
o f c h e c k in g
c o m p le te d ?
Y es
L a tc h /M o m e n ta ry
d a ta to o u tp u t &
a c tiv a te V T
N o A d d re s s o r
d a ta e rro r ?
Y es
Note: The oscillator is disabled in the
standby state and activated as long as
a logic ²high² signal is applied to the
DIN pin. i.e., the DIN should be kept
²low² if there is no signal input.
5 April 24, 2000
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet HT604L.PDF ] | |
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