HT6221/HT6222 Multi-Purpose Encoders Features · Operating voltage: 1.8V~3.5V · Three double-active keys · DOUT with 38kHz carrier for IR medium · Maximum active keys · Low standby current - HT6221: 32 keys - HT6222: 64 keys · Minimum transmission word: one word · Low power and high noise immunity CMOS · 455kHz ceramic resonator or crystal technology · 16-bit address codes · HT6221: 20-pin SOP package · 8-bit data codes HT6222: 24-pin SOP package · PPM code method Applications · Television and video cassette recorder controllers · Car door controllers · Burglar alarm systems · Car alarm systems · Smoke and fire alarm systems · Security systems · Garage door controllers · Other remote control systems General Description 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. 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. Block Diagram X 2 X 1 O s c illa to r R 1 R 8 Rev. 1.70 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 D a ta S e le c t & B u ffe r ¸ 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 V S S February 20, 2009 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 S O P -A H T 6 2 2 2 2 4 S O P -A Pin Description HT6222 Pin No. Pin Name I/O Internal Connection Description 1~6 R3~R8 I CMOS IN, Pull-low 7 DOUT O CMOS OUT Row control for keyboard matrix, active high 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 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 Serial data output pin, with a 38kHz carrier Positive power supply, 1.8V~3.5V for normal operation Most significant data bit (D7) code setting Negative power supply, ground Transmission enable indicator output CMOS IN/OUT, Pull-low Column control for keyboard matrix 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 P u ll- lo w C M O S IN 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 Rev. 1.70 2 March 9, 2009 HT6221/HT6222 Absolute Maximum Ratings Supply Voltage ..............................VSS-0.3V to VSS+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 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 Characteristic Symbol Parameter Ta=25°C Test Conditions VDD Conditions ¾ Min. Typ. Max. Unit 1.8 3 3.5 V VDD Operating Voltage ¾ 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 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 1.6 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 Rev. 1.70 3 March 9, 2009 HT6221/HT6222 Functional Description 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. Keyboard Scan 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 R 2 K 2 K 5 K 9 K 1 3 K 1 7 K 2 1 K 2 5 K 2 9 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 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. · The HT6222 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 R 6 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 R 7 R 8 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/HT6222 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 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 3 8 k H z , 3 3 % d u ty c a r r ie r 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 Rev. 1.70 4 March 9, 2009 HT6221/HT6222 The transmission codes employ the PPM (Pulse Position Modulation) method to represent their two logic states by ²0² (1.12ms) and ²1² (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 · Setting the address codes (A0~A15) the 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. For example: The following is an illustration of these rules in selecting the address codes (A0~A15). 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 ²00H². The A0~A7 are set by logical OR between 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 Rev. 1.70 0 0 b it0 1 A 0 A 1 A 2 1 1 0 A 3 1 A 4 A 5 A 6 0 1 1 5 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 9, 2009 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 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 Rev. 1.70 6 March 9, 2009 HT6221/HT6222 K 2 1 In p u t K m K 2 1 In p u t K m 3 6 m s D O U T 3 6 m s < t < 1 2 6 m s 1 0 8 m s ( m in .) 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 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 Rev. 1.70 7 March 9, 2009 HT6221/HT6222 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. 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 V S S C 7 1 4 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.) Rev. 1.70 8 March 9, 2009 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 D 7 8 0 5 0 7 D O U T H T 6 2 2 2 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.) Rev. 1.70 9 March 9, 2009 HT6221/HT6222 Package Information 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. 1.70 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° 10 March 9, 2009 HT6221/HT6222 24-pin SOP (300mil) Outline Dimensions 1 3 2 4 A B 1 2 1 C C ' G H D E a F · MS-013 Symbol Rev. 1.70 Dimensions in mil Min. Nom. Max. A 393 ¾ 419 B 256 ¾ 300 C 12 ¾ 20 C¢ 598 ¾ 613 D ¾ ¾ 104 E ¾ 50 ¾ F 4 ¾ 12 G 16 ¾ 50 H 8 ¾ 13 a 0° ¾ 8° 11 March 9, 2009 HT6221/HT6222 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 2.0±0.5 24.8+0.3/-0.2 30.2±0.2 SOP 24W Symbol Description Dimensions in mm A Reel Outer Diameter B Reel Inner Diameter 100.0±1.5 13.0+0.5/-0.2 C Spindle Hole Diameter D Key Slit Width T1 Space Between Flange T2 Reel Thickness Rev. 1.70 330.0±1.0 2.0±0.5 24.8+0.3/-0.2 30.2±0.2 12 March 9, 2009 HT6221/HT6222 Carrier Tape Dimensions P 0 D P 1 t E F W C D 1 P B 0 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 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 4.0±0.1 t Carrier Tape Thickness 0.30±0.05 C Cover Tape Width 21.3±0.1 SOP 24W Symbol Description Dimensions in mm W Carrier Tape Width 24.0±0.3 P Cavity Pitch 12.0±0.1 E Perforation Position 1.75±0.1 F Cavity to Perforation (Width Direction) 11.5±0.1 D Perforation Diameter 1.55+0.10/-0.00 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 10.9±0.1 B0 Cavity Width 15.9±0.1 K0 Cavity Depth 3.1±0.1 t Carrier Tape Thickness 0.35±0.05 C Cover Tape Width 21.3±0.1 Rev. 1.70 13 March 9, 2009 HT6221/HT6222 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) 46729 Fremont Blvd., Fremont, CA 94538, USA Tel: 1-510-252-9880 Fax: 1-510-252-9885 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. 1.70 14 March 9, 2009