HT12A/HT12E - 212 Series of Encoders

HT12A/HT12E
212 Series of Encoders
Features
· Operating voltage
· Minimum transmission word
- 2.4V~5V for the HT12A
- 2.4V~12V for the HT12E
- Four words for the HT12E
- One word for the HT12A
· Low power and high noise immunity CMOS
· Built-in oscillator needs only 5% resistor
technology
· Data code has positive polarity
· Low standby current: 0.1mA (typ.) at VDD=5V
· Minimal external components
· HT12A with a 38kHz carrier for infrared transmission
· Pair with Holtek¢s 212 series of decoders
medium
· 18-pin DIP, 20-pin SOP package
Applications
· Burglar alarm system
· Car alarm system
· Smoke and fire alarm system
· Security system
· Garage door controllers
· Cordless telephones
· Car door controllers
· Other remote control systems
General Description
12
The 2 encoders are a series of CMOS LSIs for remote
control system applications. They are capable of encoding information which consists of N address bits and
12-N data bits. Each address/data input can be set to
one of the two logic states. The programmed addresses/data are transmitted together with the header
bits via an RF or an infrared transmission medium upon
receipt of a trigger signal. The capability to select a TE
trigger on the HT12E or a DATA trigger on the HT12A
further enhances the application flexibility of the 212 series of encoders. The HT12A additionally provides a
38kHz carrier for infrared systems.
Selection Table
Function Address Address/
Data No. Oscillator Trigger
No.
Data No.
Part No.
Carrier
Output
Negative
Polarity
38kHz
No
18DIP, 20SOP
No
No
18DIP, 20SOP
HT12A
8
0
4
455kHz
D8~D11
resonator
HT12E
8
4
0
RC
oscillator
Note:
TE
Package
Address/Data represents pins that can be either address or data according to the application requirement.
Rev. 1.20
1
February 20, 2009
HT12A/HT12E
Block Diagram
TE Trigger
HT12E
O S C 2
O S C 1
O s c illa to r
T E
D a ta S e le c t
& B u ffe r
¸ 3 D iv id e r
S y n c .
C ir c u it
¸ 1 2 C o u n te r &
1 o f 1 2 D e c o d e r
A 0
1 2 T r a n s m is s io n
G a te C ir c u it
A 7
D O U T
B in a r y D e te c to r
A D 8
A D 1 1
V D D
V S S
DATA Trigger
HT12A
X 2
X 1
O s c illa to r
D a ta S e le c t
& B u ffe r
¸ 5 7 6 D iv id e r
L /M B
S y n c .
C ir c u it
¸ 1 2 C o u n te r &
1 o f 1 2 D e c o d e r
A 0
1 2 T r a n s m is s io n
G a te C ir c u it
A 7
D O U T
B in a r y D e te c to r
D 8
D 1 1
V D D
V S S
The address data pins are available in various combinations (refer to the address/data table).
Note:
Pin Assignment
8 -A d d re s s
4 -D a ta
8 -A d d re s s
4 -D a ta
8 -A d d re s s
4 -A d d r e s s /D a ta
8 -A d d re s s
4 -A d d r e s s /D a ta
N C
1
2 0
N C
N C
1
2 0
N C
A 0
1
1 8
V D D
A 0
2
1 9
V D D
A 0
1
1 8
V D D
A 0
2
1 9
V D D
A 1
2
1 7
D O U T
A 1
3
1 8
D O U T
A 1
2
1 7
D O U T
A 1
3
1 8
D O U T
A 2
3
1 6
X 1
A 2
4
1 7
X 1
A 2
3
1 6
O S C 1
A 2
4
1 7
O S C 1
A 3
4
1 5
X 2
A 3
5
1 6
X 2
A 3
4
1 5
O S C 2
A 3
5
1 6
O S C 2
A 4
5
1 4
L /M
A 4
6
1 5
L /M
A 4
5
1 4
T E
A 4
6
1 5
T E
A 5
6
1 3
D 1 1
A 5
7
1 4
D 1 1
A 5
6
1 3
A D 1 1
A 5
7
1 4
A D 1 1
A 6
7
1 2
D 1 0
A 6
8
1 3
D 1 0
A 6
7
1 2
A D 1 0
A 6
8
1 3
A D 1 0
A 7
8
1 1
D 9
A 7
9
1 2
D 9
A 7
8
1 1
A D 9
A 7
9
1 2
A D 9
V S S
9
1 0
D 8
V S S
1 0
1 1
D 8
V S S
9
1 0
A D 8
V S S
1 0
1 1
A D 8
H T 1 2 A
1 8 D IP -A
Rev. 1.20
H T 1 2 A
2 0 S O P -A
H T 1 2 E
1 8 D IP -A
2
H T 1 2 E
2 0 S O P -A
February 20, 2009
HT12A/HT12E
Pin Description
Pin Name
A0~A7
I/O
Internal
Connection
I
CMOS IN Pull-high
(HT12A)
Description
Input pins for address A0~A7 setting
These pins can be externally set to VSS or left open
NMOS TRANSMISSION
GATE PROTECTION
DIODE (HT12E)
NMOS TRANSMISSION
Input pins for address/data AD8~AD11 setting
GATE PROTECTION
These pins can be externally set to VSS or left open
DIODE (HT12E)
AD8~AD11
I
D8~D11
I
CMOS IN Pull-high
DOUT
O
CMOS OUT
L/M
I
CMOS IN Pull-high
Latch/Momentary transmission format selection pin:
Latch: Floating or VDD
Momentary: VSS
TE
I
CMOS IN Pull-high
Transmission enable, active low (see Note)
OSC1
I
OSCILLATOR 1
Oscillator input pin
OSC2
O
OSCILLATOR 1
Oscillator output pin
X1
I
OSCILLATOR 2
455kHz resonator oscillator input
X2
O
OSCILLATOR 2
455kHz resonator oscillator output
VSS
I
¾
Negative power supply, ground
VDD
I
¾
Positive power supply
Note:
Input pins for data D8~D11 setting and transmission enable, active
low
These pins should be externally set to VSS or left open (see Note)
Encoder data serial transmission output
D8~D11 are all data input and transmission enable pins of the HT12A.
TE is a transmission enable pin of the HT12E.
Approximate Internal Connections
N M O S
T R A N S M IS S IO N
G A T E
C M O S IN
P u ll- h ig h
C M O S O U T
O S C IL L A T O R
E N
O S C 1
X 2
V
Rev. 1.20
O S C 2
N M O S T R A N S M IS S IO N G A T E
P R O T E C T IO N D IO D E
O S C IL L A T O R 2
X 1
1
D D
3
February 20, 2009
HT12A/HT12E
Absolute Maximum Ratings
Supply Voltage (HT12A) ............VSS-0.3V to VSS+5.5V
Supply Voltage (HT12E) ...........................-0.3V to 13V
Input Voltage ................................VSS-0.3 to VDD+0.3V
Storage Temperature ............................-50°C to 125°C
Operating Temperature ...........................-20°C to 75°C
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
Electrical Characteristics
HT12A
Symbol
Ta=25°C
Parameter
VDD
Operating Voltage
ISTB
Standby Current
Test Conditions
Min.
Typ.
Max.
Unit
2.4
3
5
V
¾
0.1
1
mA
¾
0.1
1
mA
No load
fOSC=455kHz
¾
200
400
mA
¾
400
800
mA
VOH=0.9VDD (Source)
-1
-1.6
¾
mA
VOL=0.1VDD (Sink)
2
3.2
¾
mA
VDD
Conditions
¾
¾
3V
Oscillator stops
5V
3V
IDD
Operating Current
5V
IDOUT
Output Drive Current
5V
VIH
²H² Input Voltage
¾
¾
0.8VDD
¾
VDD
V
VIL
²L² Input Voltage
¾
¾
0
¾
0.2VDD
V
RDATA
D8~D11 Pull-high
Resistance
5V
¾
150
300
kW
VDATA=0V
HT12E
Symbol
Ta=25°C
Parameter
VDD
Operating Voltage
ISTB
Standby Current
Test Conditions
Min.
Typ.
Max.
Unit
2.4
5
12
V
¾
0.1
1
mA
¾
2
4
mA
¾
40
80
mA
¾
150
300
mA
VOH=0.9VDD (Source)
-1
-1.6
¾
mA
VOL=0.1VDD (Sink)
1
1.6
¾
mA
VDD
Conditions
¾
¾
3V
Oscillator stops
12V
3V
IDD
Operating Current
No load, fOSC=3kHz
12V
IDOUT
Output Drive Current
5V
VIH
²H² Input Voltage
¾
¾
0.8VDD
¾
VDD
V
VIL
²L² Input Voltage
¾
¾
0
¾
0.2VDD
V
fOSC
Oscillator Frequency
5V
ROSC=1.1MW
¾
3
¾
kHz
RTE
TE Pull-high Resistance
5V
VTE=0V
¾
1.5
3
MW
Rev. 1.20
4
February 20, 2009
HT12A/HT12E
Functional Description
Operation
The 212 series of encoders begin a 4-word transmission cycle upon receipt of a transmission enable (TE for the HT12E
or D8~D11 for the HT12A, active low). This cycle will repeat itself as long as the transmission enable (TE or D8~D11) is
held low. Once the transmission enable returns high the encoder output completes its final cycle and then stops as
shown below.
T E
< 1 w o rd
E n c o d e r
D O U T
T r a n s m itte d
C o n tin u o u s ly
4 w o rd s
4 w o rd s
Transmission timing for the HT12E
D 8 ~ D 1 1
K e y - in
< 1 w o rd
E n c o d e r
D O U T
w ith 3 8 k H z c a r r ie r
T r a n s m itte d
C o n tin u o u s ly
1 w o rd
1 w o rd
Transmission timing for the HT12A (L/M=Floating or VDD)
D 8 ~ D 1 1
K e y - in
( a ll d a ta = 1 )
7 w o rd s
< 1 w o rd
E n c o d e r
D O U T
T r a n s m itte d
C o n tin u o u s ly
7 w o rd s
1 w o rd
( a ll d a ta = 1 )
1 w o rd
Transmission timing for the HT12A (L/M=VSS)
Information Word
If L/M=1 the device is in the latch mode (for use with the latch type of data decoders). When the transmission enable is removed during a transmission, the DOUT pin outputs a complete word and then stops. On the other hand, if L/M=0 the device is in the momentary mode (for use with the momentary type of data decoders). When the transmission enable is
removed during a transmission, the DOUT outputs a complete word and then adds 7 words all with the ²1² data code.
An information word consists of 4 periods as illustrated below.
1 /3 b it s y n c . p e r io d
p ilo t p e r io d ( 1 2 b its )
a d d r e s s c o d e p e r io d
d a ta c o d e
p e r io d
Composition of information
Rev. 1.20
5
February 20, 2009
HT12A/HT12E
Address/Data Waveform
Each programmable address/data pin can be externally set to one of the following two logic states as shown below.
fO
S C
"O n e "
"Z e ro "
A d d re s s /
D a ta B it
Address/Data bit waveform for the HT12E
fO
S C
3 8 k H z
c a r r ie r
"O n e "
D a ta B it
"Z e ro "
D a ta B it
"O n e "
A d d r e s s B it
"Z e ro "
A d d r e s s B it
Address/Data bit waveform for the HT12A
The address/data bits of the HT12A are transmitted with a 38kHz carrier for infrared remote controller flexibility.
Address/Data Programming (Preset)
The status of each address/data pin can be individually pre-set to logic ²high² or ²low². If a transmission-enable signal
is applied, the encoder scans and transmits the status of the 12 bits of address/data serially in the order A0 to AD11 for
the HT12E encoder and A0 to D11 for the HT12A encoder.
During information transmission these bits are transmitted with a preceding synchronization bit. If the trigger signal is
not applied, the chip enters the standby mode and consumes a reduced current of less than 1mA for a supply voltage of
5V.
Usual applications preset the address pins with individual security codes using DIP switches or PCB wiring, while the
data is selected by push buttons or electronic switches.
The following figure shows an application using the HT12E:
O S C 1
O S C 2
D O U T
V D D
V
A 0
A 1
A 2
A 3
A 4
A 5
A 6
A 7
V S S
T E
A D 8
T r a n s m is s io n
m e d iu m
A D 9 A D 1 0 A D 1 1
D D
V S S
Rev. 1.20
6
February 20, 2009
HT12A/HT12E
The transmitted information is as shown:
Pilot
&
Sync.
A0
A1
A2
A3
A4
A5
A6
A7
AD8
AD9
AD10
AD11
1
0
1
0
0
0
1
1
1
1
1
0
Address/Data Sequence
The following provides the address/data sequence table for various models of the 212 series of encoders.
Address/Data Bits
Part No.
0
1
2
3
4
5
6
7
8
9
10
11
HT12A
A0
A1
A2
A3
A4
A5
A6
A7
D8
D9
D10
D11
HT12E
A0
A1
A2
A3
A4
A5
A6
A7
AD8
AD9
AD10
AD11
Transmission Enable
For the HT12E encoders, transmission is enabled by applying a low signal to the TE pin. For the HT12A encoders,
transmission is enabled by applying a low signal to one of the data pins D8~D11.
Two Erroneous HT12E Application Circuits
The HT12E must follow closely the application circuits provided by Holtek (see the ²Application circuits²).
· Error: AD8~AD11 pins input voltage > VDD+0.3V
O S C 2
V D D
O S C 1
A D 1 1
T E
A D 1 0
A D 9
V S S
A D 8
1 2 V
H T 1 2 E
· Error: The IC¢s power source is activated by pins AD8~AD11
1 2 V
O S C 2
V D D
O S C 1
A D 1 1
T E
A D 1 0
A D 9
V S S
A D 8
H T 1 2 E
Rev. 1.20
7
February 20, 2009
HT12A/HT12E
Flowchart
· HT12A
· HT12E
N o
P o w e r o n
P o w e r o n
S ta n d b y m o d e
S ta n d b y m o d e
N o
D a ta e n a b le ?
Y e s
T r a n s m is s io n
e n a b le d ?
Y e s
4 d a ta w o rd s
tr a n s m itte d
D a ta w ith c a r r ie r
s e r ia l o u tp u t
D a ta s till e n a b le d ?
Y e s
N o
N o
L /M B = G N D ?
T r a n s m is s io n
s till e n a b le d
Y e s
4 d a ta w o rd s
tr a n s m itte d
c o n tin u o u s ly
Y e s
N o
S e n d th e
la s t c o d e
Note:
S e n d ² 1 ² 7 tim e s fo r
a ll o f th e d a ta c o d e s
D8~D11 are transmission enables of the HT12A.
TE is the transmission enable of the HT12E.
Rev. 1.20
8
February 20, 2009
HT12A/HT12E
Oscillator Frequency vs. Supply Voltage
fO S C
(S c a le )
R
(W )
O S C
7 .0 0
4 7 0 k
5 1 0 k
6 .0 0
5 6 0 k
6 2 0 k
5 .0 0
6 8 0 k
7 5 0 k
4 .0 0
8 2 0 k
9 1 0 k
1 .0 M
(3 k H z )3 .0 0
1 .2 M
1 .5 M
2 .0 0
2 .0 M
1 .0 0
2
3
5
4
6
7
8
9
1 0
1 1
1 2
1 3
V
(V D C )
D D
The recommended oscillator frequency is fOSCD (decoder) @ 50 fOSCE (HT12E encoder)
1
@ fOSCE (HT12A encoder)
3
Application Circuits
V
1
2
3
4
5
6
7
8
9
A 0
V D D
A 1
D O U T
A 2
X 1
A 3
X 2
A 4
L /M B
A 5
D 1 1
A 6
D 1 0
A 7
D 9
V S S
D 8
1 0 0 W
D D
T r a n s m itte r C ir c u it
V
1 8
1
A 0
V D D
1 8
2
A 1
D O U T
1 7
3
A 2
O S C 1
1 6
4
A 3
O S C 2
1 5
1 4
5
A 4
T E
1 4
1 3
6
A 5
A D 1 1
1 3
1 2
7
A 6
A D 1 0
1 2
1 1
8
A 7
A D 9
1 1
1 0
9
V S S
A D 8
1 7
1 6
1 5
8 0 5 0
1 0 k W
4 5 5 K
1 0 0 p F
1 0 M W
1 0 0 p F
H T 1 2 A
Rev. 1.20
R
D D
O S C
1 0
H T 1 2 E
9
February 20, 2009
HT12A/HT12E
Package Information
18-pin DIP (300mil) Outline Dimensions
A
A
B
1 8
1 0
1
9
B
1 8
1 0
1
9
H
H
C
C
D
D
E
G
E
I
I
G
F
F
Fig1. Full Lead Packages
Fig2. 1/2 Lead Packages
· MS-001d (see fig1)
Symbol
Dimensions in mil
Min.
Nom.
Max.
A
880
¾
920
B
240
¾
280
C
115
¾
195
D
115
¾
150
E
14
¾
22
F
45
¾
70
G
¾
100
¾
H
300
¾
325
I
¾
¾
430
· MS-001d (see fig2)
Symbol
Rev. 1.20
Dimensions in mil
Min.
Nom.
Max.
A
845
¾
880
B
240
¾
280
C
115
¾
195
D
115
¾
150
E
14
¾
22
F
45
¾
70
G
¾
100
¾
H
300
¾
325
I
¾
¾
430
10
February 20, 2009
HT12A/HT12E
· MO-095a (see fig2)
Symbol
A
Rev. 1.20
Dimensions in mil
Min.
Nom.
Max.
845
¾
885
B
275
¾
295
C
120
¾
150
D
110
¾
150
E
14
¾
22
F
45
¾
60
G
¾
100
¾
H
300
¾
325
I
¾
¾
430
11
February 20, 2009
HT12A/HT12E
20-pin SOP (300mil) Outline Dimensions
1 1
2 0
A
B
1
1 0
C
C '
G
H
D
E
a
F
· MS-013
Symbol
Rev. 1.20
Dimensions in mil
Min.
Nom.
Max.
A
393
¾
419
B
256
¾
300
C
12
¾
20
C¢
496
¾
512
D
¾
¾
104
E
¾
50
¾
F
4
¾
12
G
16
¾
50
H
8
¾
13
a
0°
¾
8°
12
February 20, 2009
HT12A/HT12E
Product Tape and Reel Specifications
Reel Dimensions
D
T 2
A
C
B
T 1
SOP 20W
Symbol
Description
Dimensions in mm
A
Reel Outer Diameter
330.0±1.0
B
Reel Inner Diameter
100.0±1.5
C
Spindle Hole Diameter
13.0+0.5/-0.2
D
Key Slit Width
T1
Space Between Flange
T2
Reel Thickness
Rev. 1.20
2.0±0.5
24.8+0.3/-0.2
30.2±0.2
13
February 20, 2009
HT12A/HT12E
Carrier Tape Dimensions
P 0
D
P 1
t
E
F
W
C
D 1
B 0
P
K 0
A 0
R e e l H o le
IC
p a c k a g e p in 1 a n d th e r e e l h o le s
a r e lo c a te d o n th e s a m e s id e .
SOP 20W
Symbol
Description
Dimensions in mm
24.0+0.3/-0.1
W
Carrier Tape Width
P
Cavity Pitch
12.0±0.1
E
Perforation Position
1.75±0.10
F
Cavity to Perforation (Width Direction)
11.5±0.1
D
Perforation Diameter
1.5+0.1/-0.0
D1
Cavity Hole Diameter
1.50+0.25/-0.00
P0
Perforation Pitch
4.0±0.1
P1
Cavity to Perforation (Length Direction)
2.0±0.1
A0
Cavity Length
10.8±0.1
B0
Cavity Width
13.3±0.1
K0
Cavity Depth
3.2±0.1
t
Carrier Tape Thickness
0.30±0.05
C
Cover Tape Width
21.3±0.1
Rev. 1.20
14
February 20, 2009
HT12A/HT12E
Holtek Semiconductor Inc. (Headquarters)
No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan
Tel: 886-3-563-1999
Fax: 886-3-563-1189
http://www.holtek.com.tw
Holtek Semiconductor Inc. (Taipei Sales Office)
4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan
Tel: 886-2-2655-7070
Fax: 886-2-2655-7373
Fax: 886-2-2655-7383 (International sales hotline)
Holtek Semiconductor Inc. (Shanghai Sales Office)
G Room, 3 Floor, No.1 Building, No.2016 Yi-Shan Road, Minhang District, Shanghai, China 201103
Tel: 86-21-5422-4590
Fax: 86-21-5422-4705
http://www.holtek.com.cn
Holtek Semiconductor Inc. (Shenzhen Sales Office)
5F, Unit A, Productivity Building, Gaoxin M 2nd, Middle Zone Of High-Tech Industrial Park, ShenZhen, China 518057
Tel: 86-755-8616-9908, 86-755-8616-9308
Fax: 86-755-8616-9722
Holtek Semiconductor Inc. (Beijing Sales Office)
Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031
Tel: 86-10-6641-0030, 86-10-6641-7751, 86-10-6641-7752
Fax: 86-10-6641-0125
Holtek Semiconductor Inc. (Chengdu Sales Office)
709, Building 3, Champagne Plaza, No.97 Dongda Street, Chengdu, Sichuan, China 610016
Tel: 86-28-6653-6590
Fax: 86-28-6653-6591
Holtek Semiconductor (USA), Inc. (North America Sales Office)
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Tel: 1-510-252-9880
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http://www.holtek.com
Copyright Ó 2009 by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used
solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable
without further modification, nor recommends the use of its products for application that may present a risk to human life
due to malfunction or otherwise. Holtek¢s products are not authorized for use as critical components in life support devices
or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information,
please visit our web site at http://www.holtek.com.tw.
Rev. 1.20
15
February 20, 2009