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PDF HT-12D Data sheet ( Hoja de datos )
| Número de pieza | HT-12D | |
| Descripción | 2 12 Series of Decoders | |
| Fabricantes | Holtek | |
| Logotipo |  |
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om 12
t4U.c 2 Series of DecodersFeatures
e· Operating voltage: 2.4V~12V
e· Low power and high noise immunity CMOS
htechnology
S· Low standby current
ta· Capable of decoding 12 bits of information
a· Pair with Holtek¢s 212 series of encoders
.D · Binary address setting
· Received codes are checked 3 times
ww Applications
w · Burglar alarm system
m· Smoke and fire alarm system
o· Garage door controllers
· Car door controllers
.cGeneral Description
UThe 212 decoders are a series of CMOS LSIs for
remote control system applications. They are
t4paired with Holtek¢s 212 series of encoders (re-
fer to the encoder/decoder cross reference ta-
ble). For proper operation, a pair of
eencoder/decoder with the same number of ad-
dresses and data format should be chosen.
eThe decoders receive serial addresses and data
hfrom a programmed 212 series of encoders that
are transmitted by a carrier using an RF or an
SIR transmission medium. They compare the se-
rial input data three times continuously with
· Address/Data number combination
- HT12D: 8 address bits and 4 data bits
- HT12F: 12 address bits only
· Built-in oscillator needs only 5% resistor
· Valid transmission indicator
· Easy interface with an RF or an infrared
transmission medium
· Minimal external components
· Car alarm system
· Security system
· Cordless telephones
· Other remote control systems
their local addresses. If no error or unmatched
codes are found, the input data codes are de-
coded and then transferred to the output pins.
The VT pin also goes high to indicate a valid
transmission.
The 212 series of decoders are capable of decod-
ing informations that consist of N bits of ad-
dress and 12-N bits of data. Of this series, the
HT12D is arranged to provide 8 address bits
and 4 data bits, and HT12F is used to decode 12
bits of address information.
taSelection Table
aFunction Address
.DPart No.
No.
HT12D
8
HT12F
12
Data
No. Type
4L
0¾
VT Oscillator
Trigger
Package
Ö RC oscillator DIN active ²Hi² 18 DIP/20 SOP
Ö RC oscillator DIN active ²Hi² 18 DIP/20 SOP
wNotes: Data type: L stands for latch type data output.
wVT can be used as a momentary data output.
w www.DataSheet4U.com1 July 12, 1999
1 page  
Functional Description
Operation
The 212 series of decoders provides various com-
binations of addresses and data pins in differ-
ent packages so as to pair with the 212 series of
encoders.
The decoders receive data that are transmitted
by an encoder and interpret the first N bits of
code period as addresses and the last 12-N bits
as data, where N is the address code number. A
signal on the DIN pin activates the oscillator
which in turn decodes the incoming address
and data. The decoders will then check the re-
ceived address three times continuously. If the
received address codes all match the contents of
the decoder¢s local address, the 12-N bits of
data are decoded to activate the output pins
and the VT pin is set high to indicate a valid
transmission. This will last unless the address
code is incorrect or no signal is received.
The output of the VT pin is high only when the
transmission is valid. Otherwise it is always
low.
Output type
Of the 212 series of decoders, the HT12F has no
data output pin but its VT pin can be used as a
momentary data output. The HT12D, on the
other hand, provides 4 latch type data pins
whose data remain unchanged until new data
are received.
Part Data Address Output Operating
No. Pins Pins Type Voltage
HT12D 4
8 Latch 2.4V~12V
HT12F 0
12
¾ 2.4V~12V
212 Series of Decoders
Flowchart
The oscillator is disabled in the standby state
and activated when a logic ²high² signal applies
to the DIN pin. That is to say, the DIN should be
kept low if there is no signal input.
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
S to re d a ta
No
M a tc h
p r e v io u s s to r e d
d a ta ?
Y es
No
No
3 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 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
5 July 12, 1999
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet HT-12D.PDF ] | |
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