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Communication ICs
IrDA infrared communication IC (SIR compatible)
RPM-801CB Series
The RPM-801CB Series is an infrared communication IC that is compatible with the IrDA (1.0). The infrared LED, PIN photodiode and modulator / demodulator circuit have been combined on to a single package. LED current can be controlled using external resistor, and an internal register is provided for setting the baud rate and pulse width of the transmitted light. Connection to a UART requires just three lines (transmit, receive, and control) and a clock. FApplications Cellular telephones, pagers, PDA, PHS, notebook PCs, and printers. FFeatures 1) Low power consumption. 2) Infrared emitting, receiver, and modulator / demodulator on the chip. 3) Compatible with the IrDA (1.0). 4) Built-in powerdown mode. FBlock diagram
5) Power supply voltage input range 2.7V to 5.5V. 6) External clock input. 7) Light emitting pulse width can be varied.
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Communication ICs
FPin descriptions
RPM-801CB Series
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
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Communication ICs
FInput / output circuits
RPM-801CB Series
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Communication ICs
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VDD = 3V)
RPM-801CB Series
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Communication ICs
FCircuit operation (1) IrDA format
RPM-801CB Series
(2) Register function Control character format As shown in the Fig.2, the control character is made up of four address bits, four data bits, a start bit and a stop bit.
(3) Explanation of the registers Register table
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Communication ICs
1) Control register 1 2) Control register 2
RPM-801CB Series
ECHO 0 No control character echo back ECHO 1 Control character echo back ECAN 0 Reception of transmitted (self emitted) data not cancelled ECAN 1 Reception of transmitted (self emitted) data cancelled RXEN 0 Receiver off RXEN 1 Receiver on TXEN 0 Transmitter off TXEN 1 Transmitter on
LOAD 0 Do not load the clock divider register value LOAD 1 Load the clock divider register value The LOAD bit automatically becomes 0 after the * clock divider register value is loaded. 3) Clock divider register value 1
4) Clock divider register value 2
Baud rate = M input clock frequency / 8 M = (DIV4 select value) (DIV3,2 select value) At reset, the value is set to 1 / 2. The reset baud rate is therefore: 1 / 2 5) Output pulse width register 1
(DIV1,0 select value)
input clock frequency / 8.
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Communication ICs
6) Output pulse width register 2
RPM-801CB Series
Output pulse width = N input clock period / 2 N = (PW4 value) (PW3,2 value) (PW1,0 value) Note) N x 4 / M M = (DIV4 multiplier) (DIV3,2 multiplier) (DIV1,0 multiplier) (4) Timing chart (1) Reset operation
Fig.3
(2) Register write
Fig.4
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Communication ICs
(3) Echo back
RPM-801CB Series
Fig.5
(4) Transmit
Fig.6
(5) Receive
Fig.7
(6) Echo cancel
Fig.8
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Communication ICs
(7) Power down
RPM-801CB Series
Fig.9
T1 is 1 / baud rate.
FApplication example
FOperation notes After the power is applied or after a reset via RESET, the baud rate generator is set to Clock / 16, so perform the control register setting operation at a communication rate of Clock / 16. To perform infrared communication after the power is applied or after a reset via RESET, first set the value 3 into
control register 1 (both receiver and transmitter on). Determine the clock frequency according to the content of the clock divider registers 1 and 2. Set the pulse width in accordance with IrDA specifications.
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Communication ICs
FElectrical characteristics curves
RPM-801CB Series
FExternal dimensions (Unit: mm)
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