三合微科股份有限公司 SM5212E 212 RF ENCODER SAMHOP Microelectronics Corp. GENERAL DESCRIPTION FEATURES SM5212E is a RF remote control encoder paired with SM5212D. It utilizes CMOS technology. The chip has 12 bits of 2-state address pins that provides 212 codes. SM5212E/SM5212D pair is suitable for use on remote controller. * * * * * CMOS technology Low power consumption Wide range operating voltage, Vcc = 2.4~12V Up to four data bits High noise immunity APPLICATION * * * * * * Car Security Garage Door Ceiling Fan Home Security/Automatic Toys Wireless doorbell PIN ASSIGNMENTS (TOP VIEW) A0 A1 A2 A3 A4 A5 A6 A7 Vss 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 NC A0 A1 A2 A3 A4 A5 A6 A7 Vss VDD Dout OSC1 OSC2 TE A11/D0 A10/D1 A9/D2 A8/D3 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 NC VDD Dout OSC1 OSC2 TE A11/D0 A10/D1 A9/D2 A8/D3 SM5212E SM5212E-S Page 1 V1.0 三合微科股份有限公司 SM5212E SAMHOP Microelectronics Corp. 212 RF ENCODER BLOCK DIAGRAM OSC2 TE OSC1 OSCILLATOR A0 ÷ 3 DIVIDER ÷ 12 COUNTER & 1 OF 12 DECODER A1 DATA SELECT & BUFFER DOUT SYNC. CIRCUIT A2 A3 A4 12 TRANSMISSION GATE CIRCUIT A5 A6 BINARY DETECTOR A7 VDD A11/D0 A10/D1 A9/D2 A8/D3 Page 2 VSS V1.0 三合微科股份有限公司 SM5212E SAMHOP Microelectronics Corp. 212 RF ENCODER PIN DESCRIPTION NO. PIN NAME I/O 1 A0 I 2 A1 I 3 A2 I 4 A3 I 5 A4 I 6 A5 I 7 A6 I 8 A7 I 9 VSS POWER 10 A8/D3 I 11 A9/D2 I FUNCTION Address input , each pin can be set to "0' , "1". Negative power supply. Address/data input. 12 A10/D1 I 13 A11/D0 I 14 TE I Enables transmission. 15 OSC2 O 16 OSC1 I Resistor connected between these two pins determine the system clock. 17 Dout O Serial output of encoded signals. 18 VDD POWER Positive power supply. Page 3 V1.0 三合微科股份有限公司 SM5212E SAMHOP Microelectronics Corp. 212 RF ENCODER FUNCTION DESCRIPTION An information word consists of 4 periods as illustrated below. 1/3 bit sync. period pilot period (12 bits) address code period data code period Composition of information Address/Data waveform OSC BIT "1" BIT "0" Address /Data Bit TE < 1 word Encoder Dout Transmitted Continuously 4 words 4 words SM5212E begin a 4-word transmission cycle upon receipt of a transmission enable (TE active low). This cycle will repeat itself as long as the transmission enable (TE is held low). Once the transmission enable returns high the encoder output completes its final cycle and then stops as shown below. Page 4 V1.0 三合微科股份有限公司 SM5212E SAMHOP Microelectronics Corp. 212 RF ENCODER 2. OSC Frequency SM5212E's oscillator can be constructed by connecting a resistor between OSC1 and OSC2 pin. Encoder OSC Frequency KHz 560K 40 35 30 820K 25 1.0M 1.2M 20 1.5M 15 2.0M 10 3.0M 5 0 1 2 3 4 5 6 7 8 9 10 11 12 VOLTAGE The recommended oscillator frequency is FOSCD (SM5212D decoder)= ~8 - 10 FOSCD (SM5212E encoder) Page 5 V1.0 三合微科股份有限公司 SM5212E SAMHOP Microelectronics Corp. 212 RF ENCODER ABSOLUTE MAXIMUM RATINGS Ratings Unit VDD - Vss -0.3~13 V Input Voltage VI - Vss Vss-0.3~VDD+0.3 V Output Voltage VO - Vss Vss-0.3~VDD+0.3 V 500 mW Symbol Parameter Supply Voltage Maximum power disspation Pa Conditions VDD - Vss = 12V Operating Temperature Topr -20~70 o Storage Temperature Tstg -40~125 o C C DC ELECTRICAL CHARACTERISTICS Limits Test Condition Parameter Unit Symbol VDD Operating Voltage Operating Current VDD IDD ISTB Typ. Max. 2.4 5 12 V µA 3V No load - 10 20 12V FOSC = 24KHZ - 150 300 - 0.1 1 - - 1 VDH = 0.9VDD ( SOURCE) -1 - 1.6 - VOL = 0.1VDD (Sink) 1 1.6 - 3V Standby Current Conditions Min. Oscillator stops 12V 5V µA mA Output Drive Current IDOUT "H" Input Voltage VIH 0.8VDD VDD V "L" Input Voltage VIL 0 0.2VDD V Oscillator Frequency FOSC 5V ROSC = 1MΩ 24 kHz TE Pull-High Resistance R TE 5V V TE = 0V 400 KΩ o (Ta=25 C) Page 6 V1.0 三合微科股份有限公司 SM5212E SAMHOP Microelectronics Corp. 212 RF ENCODER APPLICATION CIRCUIT VDD A0 A1 A2 A3 A4 A5 A6 A7 Vss VDD Dout OSC1 OSC2 TE A11/D0 A10/D1 A9/D2 A8/D3 VDD DI ROSC RF ANT GND SM5212E Page 7 V1.0 三合微科股份有限公司 SM5212E SAMHOP Microelectronics Corp. 212 RF ENCODER ORDERING INFORMATION Part NO. SM5212E Package Part NO. 18Pin DIP Package SM5212E-S 20Pin SOP Logo Product No. E:DIP TYPE E-S:SO Package SM5212 XX xxx xx Serial Number Date Code ESD Protection Mark Page 8 V1.0