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HT6240-002 Infrared Remote Encoder
Features
* * *
Operating voltage: 2.2V~3.6V Low power consumption Few external parts
*
20-pin DIP/SOP package 24-pin SOP package
Applications
* *
Television and video cassette recorder controllers Garage door controllers
* * *
Car door controllers Security systems Other remote control systems
General Description
HT6240-002 is designed as infrared remote encoders, usually applied to TV systems. The 48 key matrix input and the extension bit input can transmit a max. of 256 instructions. HT6240-002 have three different packages: 20-pin DIP, 20-pin SOP and 24-pin SOP.
Block Diagram
PRB OSCI OSCO
8
OSC
322 D u ty 1 /3
102 D iv id e r
K ey S can D r iv e r D ecoder O u tp u t S ta g e
OF0 OF7 CT
TEST
TEST MODE
IE 0 IE 1 IE 2 IE 3
IE -K E Y E ncoder
C o n tro l U n it
DATA
8 - B it S h ift R e g is te r
C u s to m C o d e & DATA Code L a tc h
P a r a lle l to S e r ia l C o n v e rte r
VDD
VSS
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HT6240-002
Pin Assignment
VSS TEST VSS TEST PRB OSCI OSCO DATA IE 0 IE 1 IE 2 IE 3 9 10 8 7 6 5 4 3 2 1 20 19 18 17 16 15 14 13 12 11 VDD CT OF0 OF1 OF2 OF3 OF4 OF5 OF6 OF7 PRB OSCI OSCO DATA IE 0 IE 1 IE 2 IE 3 NC NC 9 10 11 12 8 7 6 5 4 3 2 1 24 23 22 21 20 19 18 17 16 15 14 13 VDD CT OF0 OF1 OF2 OF3 OF4 OF5 OF6 OF7 NC NC
H T 6 2 4 0 -0 0 2 2 0 D IP /S O P
H T 6 2 4 0 -0 0 2 24 SO P
Pad Assignment
TEST 20 VDD 18 VSS 19 CT 17
PRB 1 2 OSCI
(0 ,0 )
16 15
OF0 OF1
OSCO 3 DATE
14 4 5 6 7 IE 2 8 9 OF7 IE 3 10 OF6 12 11 13
OF2 OF3
IE 0 IE 1
OF4 OF5
Chip size: 92 118 mil
2
* The IC substrate should be connected to VDD in the PCB layout artwork.
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HT6240-002
Pad Coordinates
Pad No. 1 2 3 4 5 6 7 8 9 10 X -40.88 -40.88 -40.88 -40.88 -40.88 -40.88 -13.77 -7.14 9.22 24.40 Y 16.11 9.48 -11.56 -24.78 -34.04 -41.18 -52.78 -52.78 -53.55 -53.55 Pad No. 11 12 13 14 15 16 17 18 19 20 X 40.12 40.12 40.12 40.12 40.12 40.12 34.47 -8.97 -15.60 -22.23 Unit: mil Y -48.32 -39.74 -24.57 -15.98 -0.81 7.78 53.59 53.59 53.59 52.02
Pad Description
Pad No. 1 2 3 4 5~8 9~16 17 18 19 20 Pad Name PRB OSCI OSCO DATA IE0~IE3 OF7~OF0 CT VDD VSS TEST I/O I I O I/O I O O 3/4 3/4 I Internal Connection CMOS Pull-high CMOS CMOS CMOS, NMOS Pull-high CMOS Pull-high NMOS CMOS 3/4 3/4 CMOS Power on reset Oscillator input Oscillator output Detect custom code and extended code Detect input from key matrix Drive for key scan Generates output transmission code Positive power supply Negative power supply TEST=Low normal mode TEST=High test mode Description
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HT6240-002
Approximate internal connection circuits
In p u t te r m in a l P in : T E S T , O S C I
V
DD
P in : P R B , IE 0 ~ IE 3
V
DD
V
DD
O u tp u t te r m in a l P in : O S C O , C T
V
DD
P in : O F 0 ~ O F 7
B id ir e c tio n a l te r m in a l P in : D A T A
V
DD
Absolute Maximum Ratings
Supply Voltage..............................-0.3V to 5.2V Output Voltage..................................VSS to VDD Operating Temperature...............-20C to 70C Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings 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.
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Input Voltage ......................VSS-0.3 to VDD+0.3 Storage Temperature.................-40C to 125C
HT6240-002
Recommended Operating Condition
Symbol VDD VIH Parameter Supply Voltage High-level Input Voltage IE0~IE3, DATA High-level Voltage PRB Low-level Input Voltage IE0~IE3, DATA Low-level Input Voltage PRB fOSC Clock Oscillating Frequency VDD 3/4 3V 3V 3V 3V 3V Ta=-20C~70C, unless otherwise noted Test Conditions Conditions 3/4 3/4 3/4 3/4 3/4 3/4 Min. 2.2 2.4V 2.1V 0 0 3/4 Typ. 3/4 3V 3V 0 0 455 Max. 3.6 3V V 3V 1.2V V 0.9V 3/4 kHz Unit V
VIL
Electric Characteristics
Symbol VDD IDD IDD IOH Parameter Supply Voltage Supply Current (during operation) Supply Current (while not in operation) High-level Output Current CT Low-level Output Current CT IOL Low-level Output Current DATA Low-level Output Current OF0~OF7 Pull-up Resistance PRB RI Pull-up Resistance DATA Pull-up Resistance E0~E3
Ta=25C, VDD=3V, VSS=0V, unless otherwise noted Test Conditions VDD 3/4 3V 3V 3V 3V 3V 3V 3V 3V 3V Conditions fOSC=455kHz, Ta=-20C~70C fOSC=455kHz 3/4 VOH=2V VOL=0.9V VOL=0.9V VOL=0.9V 3/4 3/4 3/4 Min. 2.2 3/4 3/4 -5 0.3 1 1 3/4 3/4 3/4 Limits Typ. Max. 3/4 0.1 3/4 -10 0.8 4 4 80 70 70 3.6 0.3 1 3/4 3/4 3/4 3/4 3/4 3/4 3/4 kW mA Unit V mA mA mA
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HT6240-002
Functional Description
Key operation The input pins (IE0~IE3) and the output pins (OF0~OF7) constitute a max. of 48 key matrix which is also called standard key. The extended key is formed by input pin DATA and the scan output (OF5~OF7). The 48 key matrix and the extended key can transmit a max. of 256 instruction. CT maintains L and no transmission code is generated when two or more keys in standard key are pressed. Table 1 shows the relationship between the key matrix and the transmission code. Table 1 Transmission Code Key Input IE0 IE1 IE2 IE3 D1 0 0 1 1 D0 0 1 0 1 Extended bit The extended bit is formed by input pin DATA and the scan output (OF5~OF7). Fig. 2 shows an example of extended bit selection. Fig. 1 Custom code The custom code is made up of input pin DATA and scan output OF0~OF4. It has 8 bits (C0~C7); the lower 3 bits of the custom code (C5, C6 and C7) are fixed as 0. Fig. 1 shows an example of custom code selection.
DATA
OF0
OF1
OF2
OF3
OF4
C u s to m
code
C0C1C2C3C4C5C6C7 1 1 0 0 1 0 0 0
Transmission Code Scan Output OF0 OF1 OF2 OF3 OF4 OF5 OF6 OF7
D4 0 0 0 0 1 1 1 1
D3 0 0 1 1 0 0 1 1
D2 0 1 0 1 0 1 0 1
DATA
OF5
OF6
OF7
D A TA code SW =O N SW =O FF
D5 1 1
D6 1 0
D7 0 0
Transmission Code DATA Input OF5 OF6 OF7
D7 3/4 3/4 1
D6 3/4 1 3/4
D5 1 3/4 3/4
6
SW
Fig. 2
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HT6240-002
Clock oscillating circuit HT6240 has built-in feedback resistor and CMOS inverter, so a ceramic resonator can connect between the oscillator circuit input pin (OSCI) and the output pin (OSCO), (see Fig. 3). When the ceramic resonator is set to 455kHz, the carrier can be set 38kHz. The oscillating circuit will stop when there is no key pressed to save power dissipation. Transmission code When the resonator is 455kHz, the carrier of the transmission signal is 38kHz. One pulse width is 0.53ms. Therefore, twenty 38kHz clocks are included in the 0.53ms pulse width. (Fig.4 shows the carrier) HT6240-002 has two different formats. When the custom code is equal to zero, CT will send the 1st format. Otherwise, it will send the 2nd format. If the custom code (C0~C7) is 0000 0000 then Fig. 5 shows the formation of the transmission code. Fig. 6 shows the transmission code 0 and 1 and pulse width. Fig. 7 shows the formation of the 1-word transmission code. If a legal key is pressed, HT6240-002 will send at least five words (see Fig. 8).
H T 6 2 4 0 -0 0 2
OSCI OSCO
C
LI
C
LO
N o te : T h e s e c a p a c ito r s d e p e n d o n th e r e s o n a to r s . U s e th e v a lu e s r e c o m m e n d e d b y th e r e s o n a to r m a n u fa c tu re r.
Fig. 3
2 6 .4 m s
8 .8 m s
0 .5 3 m s
Fig. 4 Carrier
D0 D1 D2 D3 D4 D5
0 .5 3 m s B it " 0 " 2 .1 1 m s 0 .5 3 m s B it " 1 " 4 .2 2 m s
D a ta c o d e
Fig. 5 Formation of the transmission code
Fig. 6 Transmission code 0 and 1 and pulse width of HT6240-002
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HT6240-002
On table 2, the relationship between the key matrix and the transmission code is shown when custom code=0000 0000. The asterisks means that HT6240-002 can just send five words at a time even if a legal key is pressed for a long time. The others mean that HT6240-002 will send five or six words, even some more words if a legal key is still pressed. Table 2 OF0 OF1 OF2 OF3 OF4 OF5 OF6 OF7 IE0 00 IE1 01 IE2 02 IE3 03
D0
There are 64 instructions when the custom code=0000 0000 in HT6240-002. The transmission output CT is still L and the transmission code will not be sent when two or more keys are pressed simultaneously. If custom code 0000 0000 then Fig. 9 shows the formation of the transmission code. The transmission code consists of a head pulse, 8-bit custom code and 8-bit data code. Fig. 10 shows bit 0 and bit 1. The formation of a 1-word transmission code without carrier is shown in detail in Fig.11. Output CT should combine with the carrier when CT is high.
04 05
08
0C 10* 14* 18* 1C*
09* 0D* 11* 15* 19* 1D*
06 0A* 0E* 12* 16* 1A* 1E* 07 0B* 0F* 13* 17* 1B* 1F*
D1 D2 1 w o rd 5 0 .6 m s D3 D4
D5
Fig. 7 The formation of the 1-word transmission code
1 -w o rd 5 0 .6 m s 1 -w o rd 5 0 .6 m s 1 -w o rd 5 0 .6 m s 1 -w o rd 5 0 .6 m s 1 -w o rd
Fig. 8 A legal key will send at least five words
4 .2 2 m s C0C1C2C3C4C5C6C7 H e a d p u ls e C u s to m code 4 .2 2 m s D0D1D2D3D4D5D6D7 D a ta c o d e
8 .4 4 m s
Fig. 9 The formation of the transmission code when custom code 0000 0000
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HT6240-002
CT will send at least three words if we press a legal key. CT may send three or four words, or several words depending on the length of time the legal key is pressed. (see Fig. 12) Power on reset function (PRB) The power on reset function can be activated by connecting a capacitor to PRB pin while power is applied. The time (tC) must be longer than 0.1ms when the voltage in PRB pin (VC) becomes higher than 0.3VDD after the voltage in VDD pin exceeds 2.2V. When the power on reset function is activated, the standby state continues until an L is input to IE0~IE3.
H e a d p u ls e C u s to m
C0=0 C1=1 C2=1
0 .5 3 m s B it " 0 " 1 .0 6 m s 0 .5 3 m s B it " 1 " 2 .1 1 m s
Fig. 10
code
D a ta c o d e
D0=0 D1=0 D2=0D3=0 D4=1 D5=0D6=0D7=0
C3=0C4=0C5=0C6=0C7=0
8 .4 4 m s
4 .2 2 m s 1 -w o rd
4 .2 2 m s
Fig. 11
V o lta g e VDD 2 .2 V P R B p in
VDD
1 w o rd 6 7 .5 m s
1 w o rd
VDD
p in
Fig. 12
VSS 1 3 PRB
20
0 .3 V
DD
0
T im e T
C
H T 6 2 4 0 -0 0 2
> 0 .1 m s
Fig. 13 Example of power-on reset function
Fig. 14 Relationship between the PRB pin and the voltage
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HT6240-002
Application Circuits
Example (1)
S e ttin g th e c u s to m V
DD
code
S e ttin g D 5 , D 6 , D 7 b its
S ta n d a rd k e y
47W 1kW
V
DD
20 VDD
19 CT
18 OF0
17 OF1
16 OF2
15 OF3
14 OF4
13 OF5
12 OF6
11 OF7
H T 6 2 4 0 -0 0 2
VSS TEST PRB OSCIOSCO 1 2 103 3 4 455K 471 471 5 DATA 6 IE 0 7 8 IE 1 9 IE 2 10 IE 3
"1 "
"0 "
or
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Example (2)
S e ttin g th e c u s to m V
DD
code
D o u b le - p u s h e d k e y
S ta n d a rd k e y
47W 1kW
V
DD
20 VDD
19 CT
18 OF0
17 OF1
16 OF2
15 OF3
14 OF4
13 OF5
12 OF6
11 OF7
H T 6 2 4 0 -0 0 2
VSS TEST PRB OSCIOSCO 1 2 103 3 4 455K 471 471 5 DATA 6 7 IE 0 8 IE 1 9 IE 2 10 IE 3
"1 "
"0 "
or ( N o c o n n e c tio n )
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HT6240-002
Example (3)
S e ttin g c u s to m code E x te n d e d k e y
V
DD
S ta n d a rd k e y
47W 1kW V
DD
20 VDD
19 CT
18 OF0
17 OF1
16 OF2
15 OF3
14 OF4
13 OF5
12 OF6
11 OF7
H T 6 2 4 0 -0 0 2
VSS TEST PRB OSCIOSCO 1 2 103 3 4 455K 471 471 5 DATA 6 7 IE 0 8 IE 1 9 IE 2 10 IE 3
"1 "
"0 "
or ( N o c o n n e c tio n )
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Example (4)
V
DD
47W 1kW V
DD
20 VDD
19 CT
18 OF0
17 OF1
16 OF2
15 OF3
14 OF4
13 OF5
12 OF6
11 OF7
H T 6 2 4 0 -0 0 2
VSS TEST PRB OSCIOSCO 1 2 103 3 4 455K 471 471 5 DATA 6 7 IE 0 8 IE 1 9 IE 2 10 IE 3
"1 "
"0 "
or ( N o c o n n e c tio n )
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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 Copyright O 1999 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 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.
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