三合微科股份有限公司 SM5021 SAMHOP Microelectronics Corp. ENCODER GENERAL DESCRIPTION FEATURES The SM5021A/B is a h i g h p e r f o r m a n c e infrared remote control encoder utilizing CMOS technology. Mode A is a signal-key control and mode B is a multi-key control during data transmission, supports eight data key inputs and a LED output to indicate the status during transmission. * Wide operation voltage range, 2.4V to 6V * Eight data key control * Option of signal-key or multi-key control * Two custom codes to separate products * Auto power off for saving power * LED output to indicate transmission status * Direct infrared LED 38KHz modulation output * Low power consumption * Paired with SM5032 decoder * 16 pin DIP or SO package Auto power off function when key is not pressed to save power, custom codes to distinguish different products. SM5021 encoder is paired with SM5032 decoder for more data control applications. APPLICATIONS PIN ASSIGNMENT (TOP VIEW) * SM3015 Fan Remote Control * Audio Remote Control * Toy Remote Control * Consumer Products Remote Control C1 C2 K1 K2 K3 K4 K5 Vss 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VDD DOUT LEDO OSC2 OSC1 K8 K7 K6 SM5021A/B Page 1 V.2.0 Mar 8,2002 三合微科股份有限公司 SM5021 SAMHOP Microelectronics Corp. ENCODER BLOCK DIAGRAM VDD Vss OSC1 XTAL OSC Timing Generator OSC2 Latch Key K1 K2 Bit_ CK Filed_CK Frame_CK K3 K4 K5 C1 Encoder Key In Latcg And Error Detect C2 K6 K7 DOUT Output Drive K8 LEDO PIN DESCRIPTION Pin Name I/O Function C1,C2 I Custom Code K1 ~ K8 I Remote Control Key Inputs (Built-In Pull-Low Resistor) Vss POWER OSC1 I 455KHz XTAL OSC Pin OSC2 O 455KHz XTAL OSC Pin DOUT O Signal Output LEDO O Transmission Indicator VDD POWER Positive Power Supply Negative Power Supply ( Substrate ) Page 2 V.2.0 Mar 8,2002 三合微科股份有限公司 SM5021 SAMHOP Microelectronics Corp. ENCODER FUNCTION DESCRIPTION A. Encoder Singal Output Format Bit Format SYSCK / 192 Logic 1 is Logic 0 is EMPTY Frame Format There are four frames, encoder generates during sending. Each frame contains four field: a) Frame head / Three-bits 1 1 0 ( Metal option ) b) Custom code / Two-bits C1 C2 c) Control word / Seven-bits 0000001~1000110 d) Synch field / Four-bits of empty B. Transmission Code Table Start Word Custom Code B1 B2 B3 B4 B5 B6 B7 Transmit 1 1 0 C1 C2 0 0 0 0 0 0 1 K1 1 1 0 C1 C2 0 0 0 0 0 1 0 K2 1 1 0 C1 C2 0 0 0 0 1 0 0 K3 1 1 0 C1 C2 0 0 0 1 0 0 0 K4 1 1 0 C1 C2 0 0 1 0 0 0 0 K5 1 1 0 C1 C2 0 1 0 0 0 0 0 K6 1 1 0 C1 C2 1 0 0 0 0 1 1 K7 1 1 0 C1 C2 1 0 0 0 1 1 0 K8 Page 3 V.2.0 Mar 8,2002 三合微科股份有限公司 SM5021 SAMHOP Microelectronics Corp. ENCODER C. Transmission Timing Key In t1 OSC LED t2 DOUT Frame 1 t3 Frame 2 Frame 3 Frame 4 t4 * t1: Key pressing > 32ms * t2: Transmission time t3 + 108ms ( Four frame ) If t1 is over t3 + 108ms, DOUT will be transmitted again. [ ( Pressing time ) MOD ( t3 + 108ms ) + 1 ] * 108ms + t3 * t3: Oscillator stable time. OSC * 384 = 0.8ms * t4: 3-Bits( Head ) + 2-Bits( Custom Code ) + 7-Bits( Data ) + 6-Bits( Empty ) = 18-Bits (27ms) * OSC: 455KHz resonator Page 4 V.2.0 Mar 8,2002 三合微科股份有限公司 SM5021 SAMHOP Microelectronics Corp. ENCODER D. SM5021A Transmission Waveform Normal Condition Key 1 Key2 OSC LED DOUT F1 F2 F3 F4 F1 F2 F3 F4 F1 F2 F3 F4 Overlap Condition If more than one key is pressed, transmission stops. Key 1 Key2 t > 32ms OSC LED DOUT F1 F2 F1 F2 Page 5 F3 F4 V.2.0 Mar 8,2002 三合微科股份有限公司 SM5021 SAMHOP Microelectronics Corp. ENCODER E. SM5021B Transmission Waveform Normal Condition Key 1 Key2 OSC LED DOUT F1 F2 F3 F1 F4 F2 F3 F4 F1 F2 F3 F4 Overlap Condition If more than one key is pressed, multi-key data transmission. Key 1 t > 32ms Key2 t > t3 + 108ms OSC LED DOUT K1 K1 F F [ K1+K2 ] F F K2 K2 K2 K2 K2 K2 F F F F F F Page 6 V.2.0 Mar 8,2002 三合微科股份有限公司 SM5021 SAMHOP Microelectronics Corp. ENCODER ABSOLUTE MAXIMUM RATINGS Parameter Symbol Test Conditions Ratings Unit VDD-Vss -0.3 ~ 6 V Input Voltage VI Vss -0.3 ~ VDD +0.3 V Output Voltage VO Vss -0.3 ~ VDD +0.3 V Maximum Power Consumption Pa 500 mW Supply Voltage VDD - Vss = 5V Operating Temperature Topr -10 ~ 70 ℃ Storage Temperature Tstg -40 ~ 125 ℃ DC ELECTRICAL CHARACTERISTICS Parameter Symbol Conditions Limit Min. Typ. Max. 2.4 Supply Voltage VDD Stand-by Current ISB Input High Level VIH 1.5 3.5 V Input Low Level VIL 0 1.5 V DOUT Source Current IOH VOH = +2.4V 5 mA LEDO Source Current IOH VOH = +2.4V 7.5 mA DOUT Sink Current IOL VOL = +0.4V 5 mA VDD - Vss = 3V OSC stop all output pins open Page 7 3 6 Unit V μA 1 V.2.0 Mar 8,2002 三合微科股份有限公司 SM5021 SAMHOP Microelectronics Corp. ENCODER APPLICATION CIRCUIT R2 4.7Ω D2 IR LED BT 3V C1 10u JP1 JP2 C1 VDD C2 DOUT K1 LEDO K2 OSC2 K3 OSC1 K4 K8 K5 K7 Vss K6 Q1 NPN D1 LED 455K Q2 NPN R1 1KΩ SM5021 Page 8 V.2.0 Mar 8,2002