M494 (TV)infrared remote control receiving microprocessor

Published:2011/6/1 9:38:00 Author:Lena | Keyword: infrared, remote control, receiving, microprocessor | From:SeekIC

M494 is an infrared remote control receiving microprocessorappliedto TV etc.The related types are M708 and TDA2320.Package form is a 40-pin dual-in-line plastic package. Functions: *Minimum radius of input signal from remote signal input end(35th pin) is 0.5V(peak-to-pwak value),minimum pulse width is 8μs. *Row(a-g) and line(D0-D4) form a 5×4 keyboard matrix,every key usesresistant(maximum value is 10KΩ)connecting rows and lines. *The circuitcan prevent bounce.That is when a key closing more than 40ms,relevant instruction can be received;the key related to boot-strap/standby,boot-strap/shutdown instructions,must close more than 100ms, the instruction can be received. *Different states obtainedthrough function select end (6th pin) and keyboard line(D0-D4) whether or notconnecting a diode,to select function.



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