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| Communication ICs IrDA infrared communication IC (SIR / ASK compatible) RPM-800CB Series The RPM-800CB series is an infrared communication IC that is compatible with the IrDA1.0 and ASK communication systems. The infrared LED, PIN photodiode, and modulator circuit are combined onto a single package, and connection to a UART requires just three lines (transmit, receive, and control). FApplications Cellular phones, pagers, PDA, PHS, notebook PCs, and printers FFeatures 1) Infrared emitting, receiver, and modulator / demodulator on the chip. 2) Switchable modes. S IrDA mode S ASK mode FAbsolute maximum ratings (Ta = 25_C) 3) 2.4 to 115.2kbps communication rate. 4) Built-in powerdown mode 5) Power supply voltage input range 2.7 to 5.5V. FRecommended operating conditions (Ta = 25_C) 544 Communication ICs FBlock diagram RPM-800CB Series FPin descriptions 545 Communication ICs FInput / output circuits RPM-800CB Series 546 Communication ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C and VDD = 3V) RPM-800CB Series 547 Communication ICs FCircuit operation IrDA format RPM-800CB Series ASK format Register function Control character format As shown in the Fig.3, the control character is made up of four address bits, four data bits, a start bit and a stop bit. 548 Communication ICs Explanation of the registers Register table RPM-800CB Series 4) Mode register Reset 0000 IrDA 0001 ASK 0 0 0 0 When VDD = 5V and ASK is used, set the LED drive control register to M or L. 1) Control register 1 5) Control register 2 Reset 0 0 0 0 Reset LOAD 0 1 0 0 0 0 ECHO 0 No control character echo back 1 Control character echo back ECAN 0 Does not cancel reception of transmitted (self emitted) data 1 Cancels reception of transmitted (self emitted) data RXEN 0 Receiver OFF 1 Receiver ON TXEN 0 Transmitter OFF 1 Transmitter ON 2) LED drive current control register Do not load the baud rate counter value Load the baud rate counter value * The load bit automatically returns to 0 after the counter value is loaded. Reset 0000 H 0001 M 0010 L 0 0 0 0 3) Baud rate register Reset 0000 0001 0010 0011 0100 0101 0110 0 2.4Kbps 4.8Kbps 9.6Kbps 19.2Kbps 38.4Kbps 57.6Kbps 115.2Kbps 0 1 0 (when the clock is 3.6864MHz) 549 Communication ICs Timing chart 1) Reset operation RPM-800CB Series 2) Register write 3) Echo back 550 Communication ICs 4) Transmit RPM-800CB Series 5) Receive 6) Echo cancel 7) Power down 551 Communication ICs FApplication example RPM-800CB Series FOperation notes (1) Use a shield when there is a possibility of influence due to electromagnetic noise. (2) The baud rate is set to 9600bps after the power is applied, or the IC is reset. (3) The setting in the baud rate register becomes effective when the LOAD bit of control register 2 is set to 1. (4) Avoid using together with strong light sources. (5) We recommend to use crystal oscillator. 552 Communication ICs FElectrical characteristics curves RPM-800CB Series FExternal dimensions (Units: mm) 553 |
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