2 24 OTP Encoder
Block Diagram 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
· One time programmable process
· Data active: D0~D7
· Minimal external components
· HT6P20/A/B: 8-pin DIP/NSOP package HT6P20/D: 16-pin DIP/NSOP package
General Description
The HT6P20 is a CMOS LSI encoder designed for remote control system applications. It en- codes 24 bits of information and then serially transmits it via the DOUT pin upon receipt of transmission enable (DATA pins: D0~D7) sig- nals. The combination of address and data bits of the HT6P20 is designed using one time pro-
grammable process. In addition, the chip offers various packaging for flexible combination of programmable address/data so as to meet vari- ous applications. Its programmable ad- dress/data is transmitted together with the anti-code bits via RF or infrared transmission medium upon receipt of a trigger signal.
Applications
· Burglar alarm system
· Smoke and fire alarm system
· Garage door controllers
· Car door controllers
· Security system
· Cordless telephones
· Other remote control systems
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
A d d r e s s C o u n t e r
D a t a L a t c h V P P
S I O
M i x e r &
D r i v e r D O U T
O S C 1 O S C 2
P G M D 0 D 7
Pin Assignment
Note: The customer code and control code have been programmed into HT6P20A/B/D by Holtek¢s factory process.
The blank device HT6P20 is not programmed, it can be programmed by Holtek¢s programming kit.
Warning: The 8-pin blank device only allows programming as HT6P20A type.
The 16-pin blank device allows programming as one of HT6P20/D type. After program- ming the HT6P20 pin name are the same as one of HT6P20D, which is determined by the kit programming procedure.
Pin name ²NC² stands for no connection (floating).
1234 8765
S I O V P P V D D D O U T P G M
V S S O S C 2 O S C 1
2 4 - A d d r e s s
0 - D a t a 2 0 - A d d r e s s
4 - D a t a
1 6 1 5 1 4 1 3 1 2 1 1 1 0
9
12345678
D 0 P G M S I O V P P V D D D O U T O S C 1 O S C 2 D 1
D 2 D 3 V S S N C N C N C N C
1234 8765
N C V D D D O U T O S C 1 D 0
D 1 V S S O S C 2
2 2 - A d d r e s s 2 - D a t a
B l a n k d e v i c e B l a n k d e v i c e
1 6 1 5 1 4 1 3 1 2 1 1 1 0
9
12345678
D 0 P G M S I O V P P V D D D O U T O S C 1 O S C 2 D 1
D 2 / N C D 3 / N C V S S D 4 / N C D 5 / N C D 6 / N C D 7 / N C
H T 6 P 2 0 A
8 D I P / N S O P H T 6 P 2 0 B
8 D I P / N S O P H T 6 P 2 0 D 1 6 D I P / N S O P
H T 6 P 2 0 1 6 D I P / N S O P
1234 8765
S I O V P P V D D D O U T P G M
V S S O S C 2 O S C 1
H T 6 P 2 0 8 D I P / N S O P
Pad Assignment Pad Coordinates
Unit: mmPad No. X Y
1 -956.50 762.75
2 -1123.00 498.75
3 -1123.00 236.25
4 -1123.00 -86.25
5 -1123.00 -261.25
6 -1123.00 -583.75
7 -1027.50 -776.75
8 -852.50 -776.75
9 -530.00 -776.75
10 -355.00 -776.75
11 -180.00 -776.75
12 142.50 -776.75
13 317.50 -776.75
14 640.00 -776.75
15 815.00 -776.75
16 1137.50 -776.75
17 1118.00 -466.75
18 1118.00 -205.75
19 489.00 772.05
20 223.50 789.75
Pin Description
HT6P20D
Pin No. Pin Name I/O Internal
Connection Description
161~3 D0~D3 I CMOS IN
Pull-high Data input and transmission enable (active low) They can be externally set to VSS or left open.
4 VSS ¾ ¾ Negative power supply, ground
5~8 NC ¾ ¾ No connection
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 ¾ ¾ Positive power supply
13 VPP I ¾ Programming power supply, VDDfor normal opera-
tion
14 SIO I/O CMOS Programming address/control code input and mode
1 2 3
4 5
6
7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6
1 7 1 8 1 9
2 0
( 0 , 0 ) S I O
P G M D 0
D 1
D2 D3 VSS D4 D5 D6 D 7
O S C 2 O S C 1
DOUT
VDD
VPP NC
N C
NC
NC
Chip size: 2590 ´ 2010 (mm)2
* The IC substrate should be connected to VSS in the PCB layout artwork.
Approximate internal connection circuits
Absolute Maximum Ratings
Supply Voltage ...-0.3V to 12V Storage Temperature...-50°C to 125°C Input Voltage...VSS-0.3V to VDD+0.3V Operating Temperature ...-20°C to 75°C Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi- mum Ratings² may cause substantial damage to the device. Functional operation of this de- vice at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
Electrical Characteristics
Ta=25°CSymbol Parameter Test Conditions
Min. Typ. Max. Unit
VDD Conditions
VDD Operating Voltage ¾ ¾ 2 ¾ 12 V
ISTB Standby Current 12V Oscillator stops ¾ 1 2 mA
IDD Operating Current 12V No load
fOSC=3kHz ¾ 200 400 mA
VIH ²H² Input Voltage ¾ ¾ 0.8VDD ¾ VDD V
VIL ²L² Input Voltage ¾ ¾ 0 ¾ 0.2VDD V
RPH D0~D7 Pull-high Resistance 12V ¾ ¾ 150 300 kW
IDOUT Output Current
Source 5V 0.9VDD -2 -5 ¾ mA
12V 0.9VDD -6.5 -15 ¾ mA
Sink 5V 0.1VDD 2 5 ¾ mA
12V 0.1VDD 6 15 ¾ mA
fOSC Oscillator Frequency 12V ROSC=1.4MW ¾ 3 ¾ kHz
C M O S I N / O U T C M O S I N
P u l l - h i g h O S C I L L A T O R
O S C 1 O S C 2
C M O S O U T
V D D
Programming timing of the HT6P20D (B0~B3=1010)
Functional Description
Programming
The HT6P20 is a one time programmable encod- ing integrated circuit. The programmable codes consist of 4-bit control codes and 24-bit address codes. Before using the device, first program the internal 4 control bits and 24 address bits. Then, to program the address and control codes, con- nect the PGM pin to VSS, allowing the SIO pin to receive control and address codes from the con- tinuously transmitting programming kit. The control codes (B0~B3) and address timing are re- spectively shown on the Table and the Figure for Programming Timing. In the programming pro- cess, the mode bit (B0) has to be programmed first. The 0/2/4/8 data number is selected by the address along with the data format bits (B1,B2).
The HT6P20, in addition, provides a polarity bit (B3) to select the polarity of the output data.
Various packages of the HT6P20 offer program- mable combinations of address/data to meet various application needs.
Table 1: Control code
·Mode control (B0)
B0 Function
0 Not programmed
1 Programmed
·Address and data format (B1,B2)
B2 B1 Code Format
0 0 A0~A23
0 1 A0~A21 + D1~D0
1 0 A0~A19 + D3~D0
1 1 A0~A15 + D7~D0
·Polarity control (B3)
B3 Data Output Polarity
0 Negative polarity 1 Positive polarity
The HT6P20A/D can be programmed by the SIO pins. The HT6P20B, on the other hand, is programmed for 2-data and positive polarity application.
B 0 B 1 B 2 B 3
P o l a r i t y c o n t r o l
A d d r e s s a n d d a t a f o r m a t M o d e c o n t r o l
O S C 2 ( 3 k H z )
P G M
S I O
B 0 B 1 B 2 B 3 A 0 A 1 A 2 A 3 A 18 A 19 A 2 0 A 2 1A 2 2 A 2 3
P r o g r a m m i n g P r o g r a m m i n g
b i t
N o t e : ( 1 ) B 0 ~ B 3 a r e c o n t r o l c o d e s ( 2 ) A 0 ~ A 2 3 a r e a d d r e s s c o d e s
( 3 ) A 2 0 ~ A 2 3 s t a n d s f o r d o n ' t c a r e f o r t h e H T 6 P 2 0 D
1 0 1 0 0 1 0 0 1 0 X X X X
1C
Normal operation
The HT6P20 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 trans- mission function of the HT6P20B/D is enabled by the D0~D7 pins (active low). The following is the transmission timing of the HT6P20:
A complete code word of the HT6P20D consists of 3 periods as shown below.
The HT6P20A/B/D detects the logic state of the internal programmed address and the external data pins, and then transmits the detected information during the code period. Each address/data bit can be set to one of the following two logic states:
" O n e "
" Z e r o "
f o s c
A d d r e s s / D a t a b i t
a n t i - c o d e p e r i o d ( 4 b i t s ) p i l o t p e r i o d
( 2 3 c l o c k s ) a d d r e s s c o d e p e r i o d d a t a c o d e p e r i o d 1 / 3 b i t
( A 0 ~ A 1 9 , 6 0 c l o c k s ) ( D 3 ~ D 0 , 1 2 c l o c k s )
0 01 1
f o s c
D O U T 1 c l o c k
A complete code word for the HT6P20D
E n c o d e r D O U T
< 1 w o r d D 0 ~ D 7
> 1 w o r d
Transmission timing
Flowchart
Application Circuits
V P P S I O V S S
V D D D O U T O S C 1 O S C 2
R o s c
7234568
P G M D 0 D 1
D 2 D 3
N C N C N C
N C 9
1 0 1 1 1 2 1 3 1 4
1 1 6
1 5
H T 6 P 2 0 D R o s c @ 1 . 4 M W
+ 1 2 V T r a n s m i t t e r C i r c u i t
V P P S I O P G M V S S
V D D D O U T O S C 1 O S C 2 R o s c
1234 5687
H T 6 P 2 0 A R o s c @ 1 . 4 M W
T E
+ 1 2 V
T r a n s m i t t e r C i r c u i t
L E D
L E D S t a n d b y m o d e
T r a n s m i s s i o n e n a b l e d ? N o
N o
Y e s
Y e s A d d r e s s / d a t a w o r d s
t r a n s m i t t e d
T r a n s m i s s i o n s t i l l e n a b l e d
A d d r e s s / d a t a w o r d s t r a n s m i t t e d c o n t i n u o u s l y
P o w e r o n
P G M = 0 ? N o
Y e s P r o g r a m m i n g
m o d e
N o
Y e s P r o g r a m m i n g
c o m p l e t e d ?
N o t e : O n e t i m e p r o g r a m m a b l e
Note: In order to prevent the IC from getting damaged due to the latch up, the 100W resistor or the LED which can also be a transmission indicator is indispensible when VDD=9V~12V.
T r a n s m i t t e r C i r c u i t
V P P S I O V S S
V D D D O U T O S C 1 O S C 2
R o s c
7234568
P G M D 0 D 1
D 2 D 3
N C N C N C
N C 9
1 0 1 1 1 2 1 3 1 4
1 1 6
1 5
H T 6 P 2 0 D R o s c @ 1 . 4 M W
+ 1 2 V
1 0 0 W 0 . 1 m F
V P P S I O V S S
V D D D O U T O S C 1
O S C 2 R o s c
7234568
P G M D 0 D 1 D 2 D 3
N C N C N C
N C 9
1 0 1 1 1 2 1 3 1 4
1 1 6
1 5
H T 6 P 2 0 D R o s c @ 1 . 4 M W
+ 1 2 V T r a n s m i t t e r C i r c u i t
L E D 0 . 1 m F
1 0 0 W V P P
S I O V S S
V D D D O U T O S C 1
O S C 2 R o s c
7234568
P G M D 0 D 1 D 2 D 3
N C N C N C
N C 9
1 0 1 1 1 2 1 3 1 4
1 1 6
1 5
H T 6 P 2 0 D R o s c @ 1 . 4 M W T r a n s m i t t e r C i r c u i t
L E D 4 . 7 k W
+ 1 2 V
0 . 1 m F 1 0 0 W 1 0 0 k W
Copyright Ó 2000 by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek Holtek Semiconductor Inc. (Headquarters)
No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C.
Tel: 886-3-563-1999 Fax: 886-3-563-1189
Holtek Semiconductor Inc. (Taipei Office)
5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C.
Tel: 886-2-2782-9635 Fax: 886-2-2782-9636
Fax: 886-2-2782-7128 (International sales hotline) Holtek Semiconductor (Hong Kong) Ltd.
RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong Tel: 852-2-745-8288
Fax: 852-2-742-8657
