HOLTEK HT6P20X User Manual
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Features
·
Operating voltage: 2V~12V
·
Low power consumption
·
Built-in oscillator needs only 5% resistor
·
0/2/4/8 data selectable
·
224maximum address and data codes
·
Easy interface with an RF or IR medium
Applications
·
Burglar alarm system
·
Smoke and fire alarm system
·
Garage door controllers
·
Car door controllers
General Description
The HT6P20X is a CMOS LSI encoder designed for re
mote control system applications. It encodes 24 bits of
information and then serially transmits it via the DOUT
pin upon receipt of transmission enable (DATA pins:
D0~D7) signals. The combination of address and data
bits of the HT6P20X is designed using one time pro-
HT6P20X Series
224OTP Encoder
·
One time programmable process
·
Data active: D0~D7
·
Minimal external components
·
HT6P20A/B: 8-pin DIP/SOP package
HT6P20D: 16-pin DIP/NSOP package
·
Security system
·
Cordless telephones
·
Other remote control systems
grammable process. In addition, the chip offers various
packaging for flexible combination of programmable ad
dress/data so as to meet various applications. Its pro
grammable address/data is transmitted together with
the anti-code bits via RF or infrared transmission medium upon receipt of a trigger signal.
-
-
Block Diagram
O S C 1
O S C 2
V P P
S I O
O s c i l l a t o r
P r o g r a m m i n g
C i r c u i t
C o n t r o l U n i t
P G M
Note: Address/Data numbers are available in various combinations, refer to the functional description.
A d d r e s s
C o u n t e r
M i x e r &
D r i v e r
D a t a L a t c h
D 0 D 7
D O U T
Rev. 1.40 1 June 20, 2003
Pin Assignment
HT6P20X Series
2 4 - A d d r e s s
0 - D a t a
P G M
1
V S S
2
O S C 2
3
O S C 1
4
H T 6 P 2 0 A
8 D I P / S O P
S I O
8
V P P
7
V D D
6
D O U T
5
2 2 - A d d r e s s
2 - D a t a
D 0
1
D 1
2
V S S
3
O S C 2
4
H T 6 P 2 0 B
8 D I P / S O P
N C
8
V D D
7
D O U T
6
O S C 1
5
Pin Description
HT6P20D
I
Internal
Connection
CMOS IN
Pull-high
¾
CMOS
IN/OUT
CMOS IN
Pull-high
Data input and transmission enable (active low)
They can be externally set to VSS or left open.
Negative power supply, ground
No connection
Positive power supply
Programming power supply, V
Programming address/control code input and mode code output for
mode verification
Program mode control pin, active low
Pin No. Pin Name I/O
16
1~3
4 VSS
5~8 NC
D0~D3 I
¾¾
¾¾
9 OSC2 O OSCILLATOR Oscillator output pin
10 OSC1 I OSCILLATOR Oscillator input pin
11 DOUT O CMOS OUT Data serial transmission output
12 VDD
¾¾
13 VPP I
14 SIO I/O
15 PGM
2 0 - A d d r e s s
4 - D a t a
D 1
D 2
D 3
V S S
N C
N C
N C
N C
1 6 D I P / N S O P
Description
for normal operation
DD
1
2
3
4
5
6
7
8
H T 6 P 2 0 D
1 6
D 0
1 5
P G M
1 4
S I O
1 3
V P P
1 2
V D D
1 1
D O U T
1 0
O S C 1
9
O S C 2
Approximate internal connection circuits
C M O S I N / O U T
C M O S O U T
C M O S I N
P u l l - h i g h
V
D D
O S C 1
O S C I L L A T O R
O S C 2
Rev. 1.40 2 June 20, 2003
HT6P20X Series
Absolute Maximum Ratings
Supply Voltage ...........................VSS-0.3V to VSS+12V
Input Voltage..............................V
-0.3V to VDD+0.3V
SS
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 reliabil
ity.
Storage Temperature ............................-50°Cto125°C
Operating Temperature ...........................-20°Cto75°C
-
Electrical Characteristics
Symbol Parameter
V
DD
I
STB
I
DD
V
IH
V
IL
R
PH
I
DOUT
f
OSC
Operating Voltage
Standby Current 12V Oscillator stops
Operating Current 12V
²H² Input Voltage ¾¾
²L² Input Voltage ¾¾
D0~D7 Pull-high Resistance 12V
Output Current
Oscillator Frequency 12V
Source
Sink
Test Conditions
V
DD
Conditions
¾¾
No load, f
OSC
=3kHz
¾¾
0.9V
5V
12V
5V
12V
DD
0.9V
DD
0.1V
DD
0.1V
DD
=1.4MW¾
R
OSC
Min. Typ. Max. Unit
2
¾
¾
0.8V
0
DD
¾
12
200 400
¾
¾
V
0.2V
150 300
-2 -5 ¾
-6.5 -15 ¾
25
615
3
Ta=25°C
12 V
DD
DD
mA
mA
¾
¾
¾
mA
mA
kHz
mA
mA
V
V
kW
Functional Description
Normal Operation
The HT6P20X encodes and transmits address/data to a decoder upon receipt of a trigger signal. The address codes of
the HT6P20A are always transmitted as long as power (VDD) is supplied. The transmission function of the HT6P20B/D
is enabled by the D0~D7 pins (active low). The following is the transmission timing of the HT6P20X:
D 0 ~ D 7
E n c o d e r
D O U T
< 1 w o r d
> 1 w o r d
Transmission timing
A complete code word of the HT6P20D consists of 3 periods as shown below.
f o s c
D O U T
1 c l o c k
p i l o t p e r i o d
( 2 3 c l o c k s )
1 / 3 b i t
( A 0 ~ A 1 9 , 6 0 c l o c k s )
a d d r e s s c o d e p e r i o d
( D 3 ~ D 0 , 1 2 c l o c k s )
d a t a c o d e p e r i o d
0 01 1
a n t i - c o d e p e r i o d
( 4 b i t s )
A complete code word for the HT6P20D
Rev. 1.40 3 June 20, 2003
HT6P20X Series
The HT6P20A/B/D detects the logic state of the internal programmed address and the external data pins, and then trans
mits the detected information during the code period. Each address/data bit can be set to one of the following two logic
states:
f o s c
" O n e "
" Z e r o "
A d d r e s s /
D a t a b i t
Flowchart
P o w e r o n
S t a n d b y m o d e
N o
A d d r e s s / d a t a w o r d s
N o
T r a n s m i s s i o n
A d d r e s s / d a t a w o r d s
T r a n s m i s s i o n
e n a b l e d ?
Y e s
t r a n s m i t t e d
s t i l l e n a b l e d
Y e s
t r a n s m i t t e d
c o n t i n u o u s l y
N o
N o
N o t e : O n e t i m e p r o g r a m m a b l e
P G M = 0 ?
Y e s
P r o g r a m m i n g
m o d e
P r o g r a m m i n g
c o m p l e t e d ?
Y e s
-
Rev. 1.40 4 June 20, 2003
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