BU92747XXX Datasheet, PDF (6/46 Pages) Rohm – IrDA Controller LSI built-in Ir remote control

BD92747XXX
Datasheet
●Reset
Reset of IrDA controller and Ir remote control is common. In the case of crystal CLK oscillation, CLK isn't stable both just
after the power supply is turned on and after the power down is reset. Therefore, RESET should be set to keep L
for 2 or 3 msec until CLK becomes stable, and then RESET should be set to H after CLK stabilize.
(Make sure that the unstable period of CLK depends on Crystal and circuit constants etc.)
●Input clock
Input clock frequency is 48MHz.The tolerance is within ±100ppm.
The basis of the Duty ratio is 50% , and make it within ±30%.
●About the IrSimple reception
Data is transmitted more one-sidedly than the sending side at the IrSimple-Uni-mode. The error interrupt such as OE_EI
and DEX_EI is generated when processing and the received data reading speed to interrupt request (INTR:L) are slow etc.
and it is not likely to be able to receive it normally. It is necessary to set the interrupt processing and the reading speed, etc.
at which the entire system is considered on the HOST side.
●Example of crystal-oscillator circuit configuration
Please decide final circuitry and the constant after consulting the crystal-oscillator manufacturer.
BU92747XXX
XIN
XOUT
Rd
CL1
CL2
BU92747XXX
XIN
XOUT
Rd
CL1
Rx
CL2
Example of suppressing excitation power
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TSZ22111・15・001
6/6
TSZ02201-0E4E0F100020-1-2
24. June. 2015 Rev.001