HT6221/HT6222 Multi-Purpose Encoders Features · · · · · · · Operating voltage: 1.8V~3.5V DOUT with 38kHz carrier for IR medium Low standby current Minimum transmission word: one word 455kHz ceramic resonator or crystal 16-bit address codes 8-bit data codes · · · · PPM code method Three double-active keys Maximum active keys - HT6221: 32 keys - HT6222: 64 keys Low power and high noise immunity CMOS technology Applications · · · · Television and video cassette recorder controllers Burglar alarm systems Smoke and fire alarm systems Garage door controllers · · · · Car door controllers Car alarm systems Security systems Other remote control systems General Description The HT6221/HT6222 contain 32 keys (K1~K32) and 64 keys (K1~K64), respectively. When one of the keys is triggered, the programmed address/data is transmitted together with the header bits via an IR (38kHz carrier) transmission medium. The HT6221/HT6222 are CMOS LSI encoders designed for use in remote control systems. They are capable of encoding 16-bit address codes and 8-bit data codes. Each address/data input can be set to one of the two logic states, 0 and 1. Block Diagram X 2 X 1 O s c illa to r R 1 R 8 D iv id e r K e y b o a rd M a tr ix & G a te C ir c u it D a ta R O M & R e g is te r s C 1 A IN C 8 ¸ 2 4 C o u n te r & 1 o f 2 4 D e c o d e r D O U T L E D S y n c . C ir c u it B in a r y D e te c to r V D D D 7 1 This Material Copyrighted By Its Respective Manufacturer D a ta S e le c t & B u ffe r V S S March 2, 2000 HT6221/HT6222 Pin Assignment R 3 1 2 4 R 2 R 4 2 2 3 R 1 R 1 1 2 0 A IN R 5 3 2 2 A IN R 2 2 1 9 C 1 R 6 4 2 1 C 1 R 3 3 1 8 C 2 R 7 5 2 0 C 2 R 4 4 1 7 C 3 R 8 6 1 9 C 3 D O U T 5 1 6 C 4 D O U T 7 1 8 C 4 V D D 6 1 5 C 5 V D D 8 1 7 C 5 D 7 7 1 4 C 6 D 7 9 1 6 C 6 X 2 8 1 3 C 7 X 2 1 0 1 5 C 7 X 1 9 1 2 C 8 X 1 1 1 1 4 C 8 1 0 1 1 L E D V S S 1 2 1 3 L E D V S S H T 6 2 2 1 2 0 D IP /S O P H T 6 2 2 2 2 4 D IP /S O P Pad Assignment K I3 K I2 K I1 K I0 C C S K I4 2 4 2 3 2 2 2 1 2 0 1 9 K IO 0 1 K I5 2 K I6 3 4 R E M 5 9 1 0 1 1 1 2 1 3 K IO 6 8 K IO 7 O S C O L M B 7 V S S S E L O S C I 6 K IO 1 1 7 K IO 2 1 6 K IO 3 1 5 K IO 4 1 4 K IO 5 (0 ,0 ) K I7 V D D 1 8 Chip size: 94 ´ 104 (mil)2 * The IC substrate should be connected to VDD in the PCB layout artwork. 2 This Material Copyrighted By Its Respective Manufacturer March 2, 2000 HT6221/HT6222 Pad Coordinates Unit: mil Pad No. X Y Pad No. X Y 1 -41.99 34.43 13 34.17 -46.88 2 -41.99 22.02 14 41.95 -30.26 3 -13.98 -41.99 15.39 15 41.95 4 -41.99 2.98 16 41.95 -4.12 5 -41.99 -5.61 17 41.95 12.16 6 -41.99 -28.31 18 41.95 22.02 7 -41.99 -37.83 19 39.99 46.84 8 -41.99 -46.88 20 28.26 46.84 9 -20.95 -46.88 21 -11.18 46.84 10 -14.32 -46.88 22 -23.16 46.84 11 -4.25 -46.88 23 -29.79 46.84 12 24.31 -46.88 24 -39.27 46.84 Pin Description HT6222 I/O Internal Connection R3~R8 I CMOS IN Pull-low Row control for keyboard matrix, active high 7 DOUT O CMOS OUT Serial data output pin, with a 38kHz carrier 8 VDD ¾ ¾ 9 D7 I CMOS IN 10 X2 O OSCILLATOR 455kHz resonator oscillator output 11 X1 I OSCILLATOR 455kHz resonator oscillator input 12 VSS ¾ ¾ 13 LED O CMOS OUT 14~21 C8~C1 I/O CMOS IN/OUT Pull-low 22 AIN I CMOS IN Pull-high Pull-low Low byte address codes (8 bits) scan input 23~24 R1~R2 I CMOS IN Pull-low Row control for keyboard matrix, active high Pin No. Pin Name 1~6 Description Positive power supply, 1.8V~3.5V for normal operation Most significant data bit (D7) code setting Negative power supply Transmission enable indicator output Column control for keyboard matrix 3 This Material Copyrighted By Its Respective Manufacturer March 2, 2000 HT6221/HT6222 Approximate internal connection circuits C M O S IN /O U T V C M O S IN /O U T P u ll- lo w D D C M O S IN C M O S IN P u ll- lo w C M O S O U T V D D O S C IL L A T O R X 2 X 1 1 0 M W E N Absolute Maximum Ratings Supply Voltage.................................-0.3V to 6V 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 "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. Electrical Characteristic Symbol Parameter Ta=25°C Test Conditions VDD Conditions Min. Typ. Max. Unit VDD Operating Voltage ¾ ¾ 1.8 3 3.5 V ISTB Standby Current 3V Oscillator stops ¾ 0.1 1.0 mA IDD Operating Current 3V fOSC=455kHz No load ¾ 200 400 mA IOH1 Output Source Current for DOUT 3V VO=2.7V -2.0 -4.0 ¾ mA IOL1 Output Sink Current for DOUT 3V VO=0.3V 50 100 ¾ mA IOH2 Output Source Current for LED 3V VO=2.7V -10 -60 ¾ mA IOL2 Output Sink Current for LED 3V VO=0.3V 1.2 2.0 ¾ mA IOH3 Output Source Current for C1~C8 3V VO=2.7V -0.6 -2.0 ¾ mA 4 This Material Copyrighted By Its Respective Manufacturer March 2, 2000 HT6221/HT6222 Symbol Test Conditions Parameter VDD Conditions Min. Typ. Max. Unit IOL3 Output Sink Current for C1~C8 3V VO=0.3V 10 30 ¾ mA VIH1 Input High Voltage for R1~R8 3V ¾ 1.9 ¾ 3.0 V VIL1 Input Low Voltage for R1~R8 3V ¾ 0 ¾ 0.8 V VIH2 Input High Voltage for C1~C8 3V ¾ 1.1 ¾ 3.0 V VIL2 Input Low Voltage for C1~C8 3V ¾ 0 ¾ 0.6 V VIH3 Input High Voltage for AIN 3V ¾ 1.25 ¾ 3.0 V VIL3 Input Low Voltage for AIN 3V ¾ 0 ¾ 0.6 V RPH1 Input Pull-high Resistance for AIN 3V VIN=0V 100 200 400 kW RPL1 Input Pull-low Resistance for AIN 3V VIN=3V 70 150 250 kW RPL2 Input Pull-low Resistance for R1~R8 3V VIN=3V 120 200 320 kW RPL3 Input Pull-low Resistance for C1~C8 3V VIN=3V 300 500 1500 kW fOSC System Frequency ¾ 455kHz ceramic resonator ¾ 455 ¾ kHz Functional Description Keyboard scan · The HT6222 keyboard form The HT6221/HT6222 remain in the halt mode during the standby state (at this time, the oscillator stops, and the standby current<1mA). The HT6221 consists of 32 active keys, and the HT6222 has 64 active keys. The keyboard forms of the HT6221/ HT6222 are shown below. · The HT6221 keyboard form C 1 C 2 C 3 C 4 C 5 C 6 C 7 C 8 R 1 K 1 K 5 K 9 K 1 3 K 1 7 K 2 1 K 2 5 K 2 9 R 2 K 2 K 6 K 1 0 K 1 4 K 1 8 K 2 2 K 2 6 K 3 0 R 3 K 3 K 7 K 1 1 K 1 5 K 1 9 K 2 3 K 2 7 K 3 1 R 4 K 4 K 8 K 1 2 K 1 6 K 2 0 K 2 4 K 2 8 K 3 2 R 5 K 3 3 K 3 7 K 4 1 K 4 5 K 4 9 K 5 3 K 5 7 K 6 1 K 3 4 K 3 8 K 4 2 K 4 6 K 5 0 K 5 4 K 5 8 K 6 2 K 3 5 K 3 9 K 4 3 K 4 7 K 5 1 K 5 5 K 5 9 K 6 3 K 3 6 K 4 0 K 4 4 K 4 8 K 5 2 K 5 6 K 6 0 K 6 4 C 1 C 2 C 3 C 4 C 5 C 6 C 7 C 8 R 6 R 1 K 1 K 5 K 9 K 1 3 K 1 7 K 2 1 K 2 5 K 2 9 R 7 R 2 K 2 K 6 K 1 0 K 1 4 K 1 8 K 2 2 K 2 6 K 3 0 R 8 R 3 K 3 K 7 K 1 1 K 1 5 K 1 9 K 2 3 K 2 7 K 3 1 R 4 K 4 K 8 K 1 2 K 1 6 K 2 0 K 2 4 K 2 8 K 3 2 5 This Material Copyrighted By Its Respective Manufacturer March 2, 2000 HT6221/HT6222 To avoid mistakes made by keyboard scanning or simultaneous two-key inputs (except for the three double-key active functions (K21+K22, K21+K23, and K21+K24), the HT6221/HT6222 are facilitated with 36ms starting time. When one of the keys (32 or 64 keys) is triggered for over 36ms, the oscillator is enabled and the chip is activated. If the key is pressed and held for 108ms or less, the 108ms transmission codes are enabled and comprised of a header code (9ms), an off code (4.5ms), low byte address codes (9ms~18ms), high byte address codes (9ms~18ms), 8-bit data codes (9ms~18ms), and the inverse codes of the 8-bit data codes (18ms~9ms). After the pressed key is held for 108ms, if the key is still held down, the transmission codes turn out to be a composition of header (9ms) and off codes (2.5ms) only. The HT6221/HT6222 also provide three double-key active functions (K21+K22, K21+K23, and K21+K24) for tape deck recording operations. The double-key operation rules are shown in timing 4 and timing 6. Transmission codes The transmission codes of the HT6221/6222 consist of a 9ms header code, a 4.5ms off code, 16-bit address codes (18ms~36ms), 9ms~18ms 8-bit data codes, and the inverse code of the 8-bit data codes. The following is an illustration of the transmission codes: K e y - in (K 1 ~ K 6 4 ) K e y E n a b le s 3 6 m s m in . X 2 F o s c = 4 5 5 k H z 4 .5 m s 0 .5 6 m s 3 8 k H z , 3 3 % d u ty c a r r ie r D O U T 9 m s 4 5 m s ~ 6 3 m s (A 0 ~ A 1 5 + D 0 ~ D 7 + D 0 ~ D 7 ) 9 m s 2 .5 m s 0 .5 6 m s 9 m s 2 .5 m s 1 0 8 m s 1 0 8 m s Output format for the DOUT The output code carrier of the DOUT pin is shown in Timing 2: 3 8 k H z C a r r ie r 8 .7 7 m s 2 6 .3 m s 38kHz carrier The transmission codes employ the PPM (Pulse Position Modulation) method to represent their two logic states by "0" (1.12ms) and "1" (2.24ms) as shown in Timing 3: 3 8 k H z c a r r ie r "Z e ro " 0 .5 6 m s d a ta p e r io d ( 1 .1 2 m s ) 3 8 k H z c a r r ie r "O n e " d a ta p e r io d ( 2 .2 4 m s ) Logic states 6 This Material Copyrighted By Its Respective Manufacturer March 2, 2000 HT6221/HT6222 · Setting the address codes (A0~A15) external switch S0~S7 and the ROM1. The A8~A15 equal some bits inverted to A0~A7, the inversion are decided by Logical OR between the external switch S8~S15 and the ROM2. The algorithm rule of the address codes (A0~A15) can be selected by mask option. In this case, the 16-bit on-chip MASK ROM (ROM1 and ROM2) are available, and the value of ROM1 (8 bits) and ROM2 (8 bits) are decided by one MASK LAYER. The current value of ROM1 and ROM2 are both "00H". The A0~A7 are set by logical OR between the For example: The following is an illustration of these rules in selecting the address codes (A0~A15). H T 6 2 2 1 /H T 6 2 2 2 A IN C 1 C 2 C 3 C 4 C 5 C 6 C 7 C 8 2 0 0 k W ´ 8 S 8 S 9 S 1 0 S 1 1 S 1 2 S 1 3 S 1 4 S 1 5 1 N 4 1 4 8 ´ 8 S 0 S 1 S 2 S 3 S 4 S 5 S 6 S 7 ( S w itc h O p e n : 0 , S w itc h C lo s e : 1 ) E x te r n a l S w itc h S 0 ~ S 1 5 : O n - c h ip R O M 1 , R O M 2 : A 0 ~ A 7 : 1 0 0 0 b it0 0 1 0 0 0 1 0 0 1 0 0 0 0 S 0 ~ S 7 O R R O M 1 0 0 1 1 0 1 0 b it7 1 A 0 A 1 A 2 1 1 0 A 3 1 A 4 A 5 A 6 0 1 1 7 This Material Copyrighted By Its Respective Manufacturer 0 0 b it0 1 A 7 1 0 0 0 A 8 '~ A 1 5 ': A 8 ~ A 1 5 : 0 0 0 0 0 1 0 0 0 0 S 8 ~ S 1 5 O R R O M 2 1 0 0 1 0 0 b it7 0 C o m p le m e n t 1 : n o n in v e r s io n 0 : in v e r s io n March 2, 2000 HT6221/HT6222 · Values of the data codes (D0~D7) Table 3: Double-key data code table The HT6221/HT6222 contain 32 and 64 active keys, respectively. Each key corresponds to a data code. For tape deck recording, the HT6221/HT6222 provide three double-key functions. The double-key, single-key, and double-key operation rules are shown in Table 3, Table 4, Timing 4, Timing 5 and Timing 6. KEY Data Codes D0~D6 Data Code D7 K21+K22 1010110 0/1 K21+K23 0110110 0/1 K21+K24 1110110 0/1 Note: D7 is defined by an external switch Table 4: K1~K64 single-key data code table KEY Data Codes D0~D6 Data Code D7 KEY Data Codes D0~D6 Data Code D7 K1 0000 000 0/1 K33 0000 001 0/1 K2 1000 000 0/1 K34 1000 001 0/1 K3 0100 000 0/1 K35 0100 001 0/1 K4 1100 000 0/1 K36 1100 001 0/1 K5 0010 000 0/1 K37 0010 001 0/1 K6 1010 000 0/1 K38 1010 001 0/1 K7 0110 000 0/1 K39 0110 001 0/1 K8 1110 000 0/1 K40 1110 001 0/1 K9 0001 000 0/1 K41 0001 001 0/1 K10 1001 000 0/1 K42 1001 001 0/1 K11 0101 000 0/1 K43 0101 001 0/1 K12 1101 000 0/1 K44 1101 001 0/1 K13 0011 000 0/1 K45 0011 001 0/1 K14 1011 000 0/1 K46 1011 001 0/1 K15 0111 000 0/1 K47 0111 001 0/1 K16 1111 000 0/1 K48 1111 001 0/1 K17 0000 100 0/1 K49 0000 101 0/1 K18 1000 100 0/1 K50 1000 101 0/1 K19 0100 100 0/1 K51 0100 101 0/1 K20 1100 100 0/1 K52 1100 101 0/1 K21 0010 100 0/1 K53 0010 101 0/1 K22 1010 100 0/1 K54 1010 101 0/1 K23 0110 100 0/1 K55 0110 101 0/1 K24 1110 100 0/1 K56 1110 101 0/1 K25 0001 100 0/1 K57 0001 101 0/1 8 This Material Copyrighted By Its Respective Manufacturer March 2, 2000 HT6221/HT6222 KEY Data Codes D0~D6 Data Code D7 KEY Data Codes D0~D6 Data Code D7 K26 1001 100 0/1 K58 1001 101 0/1 K27 0101 100 0/1 K59 0101 101 0/1 K28 1101 100 0/1 K60 1101 101 0/1 K29 0011 100 0/1 K61 0011 101 0/1 K30 1011 100 0/1 K62 1011 101 0/1 K31 0111 100 0/1 K63 0111 101 0/1 K32 1111 100 0/1 K64 1111 101 0/1 Note: D7 is defined by an external switch D7=0 : connect to VDD D7=1 : connect to VSS K 2 1 In p u t K m K 2 1 In p u t K m 3 6 m s < t < 1 2 6 m s 3 6 m s 1 0 8 m s ( m in .) D O U T 3 6 m s K 2 1 c o d e tr a n s m is s io n (a ) K 2 1 In p u t K m K 2 1 In p u t K m 0 < t < 3 6 m s N o tr a n s m is s io n D O U T (b ) K 2 1 In p u t K 2 1 0 < t < 3 6 m s K m In p u t K m N o tr a n s m is s io n D O U T (c ) K 2 1 In p u t K m K 2 1 In p u t K m 3 6 m s 3 6 m s < t < 1 2 6 m s 3 6 m s D O U T 1 0 8 m s ( m in .) K m c o d e tr a n s m is s io n (d ) Invalid double-key input 9 This Material Copyrighted By Its Respective Manufacturer March 2, 2000 HT6221/HT6222 K n In p u t K n 3 6 m s t > 1 0 8 m s D O U T K n c o d e tr a n s m is s io n (a ) K n In p u t K n t < 1 0 8 m s 3 6 m s D O U T 1 0 8 m s K n c o d e tr a n s m is s io n (b ) Note: Kn can be one of K1~K64 Valid single-key input K 2 1 In p u t K m K 2 1 In p u t K m 3 6 m s 3 6 m s D O U T t > 1 2 6 m s 1 0 8 m s ( m in .) K 2 1 c o d e tr a n s m is s io n K 2 1 + K m c o d e tr a n s m is s io n Note: Km can be one of K22~K24 Valid double-key input DOUT and LED After the transmission codes are sent, the DOUT pin generates transmission codes with a carrier, and the LED goes low to drive a transmission indicator. 10 This Material Copyrighted By Its Respective Manufacturer March 2, 2000 HT6221/HT6222 Application Circuits Application circuit 1 V D D 1 .8 V ~ 3 .5 V In fra re d 4 7 m F /1 6 V 3 3 0 W 4 7 W 1 0 0 p F 1 0 0 p F 1 k W L E D 4 5 5 k H z c e r a m ic r e s o n a to r 9 8 X 1 7 1 1 X 2 5 6 L E D D O U T V D D H T 6 2 2 1 D 7 C 1 C 2 1 9 5 1 k W ´ 8 C 3 1 8 C 4 1 7 C 5 1 6 C 6 1 5 C 7 1 4 V S S C 8 1 3 R 1 1 2 K 1 K 5 K 9 K 1 3 K 1 7 K 2 1 K 2 5 K 2 9 K 2 K 6 K 1 0 K 1 4 K 1 8 K 2 2 K 2 6 K 3 0 K 3 K 7 K 1 1 K 1 5 K 1 9 K 2 3 K 2 7 K 3 1 K 4 K 8 K 1 2 K 1 6 K 2 0 K 2 4 K 2 8 K 3 2 R 2 1 R 3 2 8 0 5 0 R 4 3 1 0 A IN 4 2 0 1 N 4 1 4 8 ´ 8 Note: Typical infrared diode: EL-1L2 (KODENSHI CORP.) 11 This Material Copyrighted By Its Respective Manufacturer March 2, 2000 HT6221/HT6222 Application circuit 2 V D D 1 .8 V ~ 3 .5 V In fra re d 4 7 m F /1 6 V 3 3 0 W 4 7 W 1 0 0 p F 1 0 0 p F 1 k W 4 5 5 k H z c e r a m ic r e s o n a to r 1 0 1 1 X 1 9 X 2 1 3 8 L E D V D D 8 0 5 0 7 D O U T H T 6 2 2 2 D 7 C 1 C 2 2 1 5 1 k W ´ 8 C 3 2 0 C 4 1 9 C 5 1 8 C 6 1 7 C 7 1 6 C 8 1 5 R 1 1 4 K 1 K 5 K 9 K 1 3 K 1 7 K 2 1 K 2 5 K 2 9 K 2 K 6 K 1 0 K 1 4 K 1 8 K 2 2 K 2 6 K 3 0 K 3 K 7 K 1 1 K 1 5 K 1 9 K 2 3 K 2 7 K 3 1 K 4 K 8 K 1 2 K 1 6 K 2 0 K 2 4 K 2 8 K 3 2 K 3 3 K 3 7 K 4 1 K 4 5 K 4 9 K 5 3 K 5 7 K 6 1 K 3 4 K 3 8 K 4 2 K 4 6 K 5 0 K 5 4 K 5 8 K 6 2 K 3 5 K 3 9 K 4 3 K 4 7 K 5 1 K 5 5 K 5 9 K 6 3 K 3 6 K 4 0 K 4 4 K 4 8 K 5 2 K 5 6 K 6 0 K 6 4 V S S R 2 2 3 R 3 2 4 R 4 1 R 5 2 R 6 3 R 7 4 R 8 5 1 2 A IN 6 2 2 1 N 4 1 4 8 ´ 8 Note: Typical infrared diode: EL-1L2 (KODENSHI CORP.) 12 This Material Copyrighted By Its Respective Manufacturer March 2, 2000 HT6221/HT6222 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 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 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. 13 This Material Copyrighted By Its Respective Manufacturer March 2, 2000