Author Topic: info on MDY 4B065B 1701t chip that creates audio for talking smoke alarm  (Read 551 times)

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Offline dentakuTopic starter

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I've been messing with a KIDDE Model P301B-CA 10 year sealed lithium photoelectric smoke alarm with voice alert.
I've been able to get it to play what I believe is all the audio samples it contains by connecting an Arduino to it and shiftOut data to the Data and Clock pins of the chip that puts out the audio. I've found voice alerts for Carbon Monoxide even though this is just a smoke alarm so obviously they've been smart and made one chip that can be used in different products.

This chip has MDY 4B065B 1701t written on it but I can't find any information online.
Pins 1 and 2 are connected directly to the ground plane.
Pins 3 and 4 are connected together and put out PWM audio to the speaker.
Pins 5 and 6 have a tiny cap to ground then go through a 5R1 resistor to a transistor of some sort. These pins have around 2.5V on them
Pin  7 is Clock and goes to a PIC16 but I cut the trace and connected it to an Arduino
Pin  8 is Data and goes to a PIC16 but I cut the trace and connected it to an Arduino

It looks like instead of just powering VCC all the time and controlling a latch or enable pin separately, they've connected VCC and the latch together and re-power it after the piezo busser is done doing it's loud alarm and enable the voice chip again because it would be useless to have it speak while the piezo is sounding anyway.

Does anyone at least know which manufacturer MDY is?
 


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