SM5028S

三合微科股份有限公司 SAMHOP Microelectronics Corp. SM5028RF 212 RF ENCODER GENERAL DESCRIPTION SM5028RF is a RF remote control encoder paired with SM5038RF. It utilizes CMOS technology. The chip has 12 bits of 2-state address pins that provides 212 codes. SM5028RF/SM5038RF pair is suitable for use on remote controller. FEATURES * * * * * 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 SM5028RF VDD Dout OSC1 OSC2 TE A11/D0 A10/D1 A9/D2 A8/D3 NC A0 A1 A2 A3 A4 A5 A6 A7 Vss 1 2 3 4 5 6 7 8 9 10 SM5028S 20 19 18 17 16 15 14 13 12 11 NC VDD Dout OSC1 OSC2 TE A11/D0 A10/D1 A9/D2 A8/D3 Page 1 V1.0 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM5028RF 212 RF ENCODER BLOCK DIAGRAM OSC2 OSC1 TE OSCILLATOR ÷ 3 DIVIDER DATA SELECT & BUFFER DOUT A0 A1 A2 A3 A4 A5 A6 A7 ÷ 12 COUNTER & 1 OF 12 DECODER SYNC. CIRCUIT 12 TRANSMISSION GATE CIRCUIT BINARY DETECTOR A11/D0 A10/D1 A9/D2 A8/D3 VDD VSS Page 2 V1.0 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM5028RF 212 RF ENCODER PIN DESCRIPTION NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 PIN NAME A0 A1 A2 A3 A4 A5 A6 A7 VSS A8/D3 A9/D2 A10/D1 A11/D0 TE OSC2 OSC1 Dout VDD I/O I I I I I I I I POWER I I Address/data input. I I I O I O POWER Enables transmission. Resistor connected between these two pins determine the system clock. Serial output of encoded signals. Positive power supply. V1.0 Negative power supply. Address input , each pin can be set to "0' , "1". FUNCTION Page 3 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM5028RF 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 4 words Transmitted Continuously 4 words SM5028RF 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 SAMHOP Microelectronics Corp. SM5028RF 212 RF ENCODER 2. OSC Frequency SM5028RF'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 20 1.2M 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 (SM5038RF decoder)= 8 - 10 FOSCD (SM5028RF encoder) Page 5 V1.0 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM5028RF 212 RF ENCODER ABSOLUTE MAXIMUM RATINGS Parameter Supply Voltage Input Voltage Output Voltage Maximum power disspation Operating Temperature Storage Temperature Symbol VDD - Vss VI - Vss VO - Vss Pa Topr Tstg VDD - Vss = 12V Conditions Ratings -0.3~13 Vss-0.3~VDD+0.3 Vss-0.3~VDD+0.3 500 -20~70 -40~125 Unit V V V mW o o C C DC ELECTRICAL CHARACTERISTICS Test Condition Parameter Operating Voltage Operating Current Symbol VDD VDD 3V IDD 12V 3V Standby Current ISTB 12V 5V VDH = 0.9VDD ( SOURCE) VOL = 0.1VDD (Sink) Limits Unit Min. 2.4 Typ. 5 10 150 0.1 - 1.6 1.6 Max. 12 20 300 1 1 VDD 0.2VDD Conditions V µA µA No load FOSC = 24KHZ Oscillator stops -1 1 0.8VDD Output Drive Current IDOUT VIH VIL FOSC R TE mA V V kHz KΩ "H" Input Voltage "L" Input Voltage Oscillator Frequency TE Pull-High Resistance 0 5V 5V ROSC = 1MΩ V TE = 0V 24 400 (Ta=25 C) o Page 6 V1.0 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM5028RF 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 GND ANT SM5028RF Page 7 V1.0 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM5028RF 212 RF ENCODER ORDERING INFORMATION Part NO. SM5028RF Package 18Pin DIP Part NO. SM5028S Package 20Pin SOP Logo Product No. RF:DIP TYPE S:SO Package SM5028 XX xxx xx Serial Number Date Code ESD Protection Mark Page 8 V1.0