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| SM5021 SAMHOP Microelectronics Corp. ENCODER GENERAL DESCRIPTION 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. 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. FEATURES * 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 APPLICATIONS * SM3015 Fan Remote Control * Audio Remote Control * Toy Remote Control * Consumer Products Remote Control PIN ASSIGNMENT (TOP VIEW) 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 SM5021 SAMHOP Microelectronics Corp. ENCODER BLOCK DIAGRAM VDD Vss OSC1 XTAL OSC OSC2 Latch Key K1 K2 K3 K4 K5 K6 K7 K8 Output Drive DOUT LEDO Timing Generator Bit_ CK Filed_CK Frame_CK C1 C2 Key In Latcg And Error Detect Encoder PIN DESCRIPTION Pin Name C1,C2 K1 ~ K8 Vss OSC1 OSC2 DOUT LEDO VDD I/O I I POWER I O O O POWER Page 2 Function Custom Code Remote Control Key Inputs (Built-In Pull-Low Resistor) Negative Power Supply ( Substrate ) 455KHz XTAL OSC Pin 455KHz XTAL OSC Pin Signal Output Transmission Indicator Positive Power Supply V.2.0 Mar 8,2002 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 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 Custom Code B1 C1 C1 C1 C1 C1 C1 C1 C1 C2 C2 C2 C2 C2 C2 C2 C2 0 0 0 0 0 0 1 1 B2 0 0 0 0 0 1 0 0 B3 0 0 0 0 1 0 0 0 B4 0 0 0 1 0 0 0 0 B5 0 0 1 0 0 0 0 1 B6 0 1 0 0 0 0 1 1 B7 1 0 0 0 0 0 1 0 Transmit K1 K2 K3 K4 K5 K6 K7 K8 Page 3 V.2.0 Mar 8,2002 SM5021 SAMHOP Microelectronics Corp. ENCODER C. Transmission Timing Key In t1 OSC LED t2 DOUT t3 Frame 1 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 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 F3 F4 Page 5 V.2.0 Mar 8,2002 SM5021 SAMHOP Microelectronics Corp. ENCODER E. SM5021B 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, multi-key data transmission. Key 1 t > 32ms Key2 t > t3 + 108ms OSC LED K1 DOUT F K1 F [ K1+K2 ] F F K2 F K2 F K2 F K2 F K2 F K2 F Page 6 V.2.0 Mar 8,2002 SM5021 SAMHOP Microelectronics Corp. ENCODER ABSOLUTE MAXIMUM RATINGS Parameter Supply Voltage Input Voltage Output Voltage Maximum Power Consumption Operating Temperature Storage Temperature Symbol Test Conditions VDD-Vss VI VO Pa Topr Tstg VDD - Vss = 5V Ratings -0.3 ~ 6 Vss -0.3 ~ VDD +0.3 Vss -0.3 ~ VDD +0.3 500 -10 ~ 70 -40 ~ 125 Unit V V V mW J J DC ELECTRICAL CHARACTERISTICS Parameter Supply Voltage Symbol VDD Conditions Limit Min. Typ. Max. 2.4 3 6 Unit V Stand-by Current ISB VDD - Vss = 3V OSC stop all output pins open 1.5 0 VOH = +2.4V VOH = +2.4V VOL = +0.4V 1 g A Input High Level Input Low Level DOUT Source Current LEDO Source Current DOUT Sink Current VIH VIL IOH IOH IOL 3.5 1.5 5 7.5 5 V V mA mA mA Page 7 V.2.0 Mar 8,2002 SM5021 SAMHOP Microelectronics Corp. ENCODER APPLICATION CIRCUIT R2 4.7[ D2 IR LED BT 3V JP1 JP2 C1 C2 K1 K2 VDD DOUT LEDO OSC2 OSC1 K8 K7 K6 Q1 NPN D1 LED 455K C1 10u K3 K4 K5 Vss Q2 NPN R1 1K[ SM5021 Page 8 V.2.0 Mar 8,2002 |
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