PIC10F microcontroller output pin tolerance to overriding voltages

I am using PIC10F microcontrollers in a wireless project that has evolved into needing to use an 'in circuit' programmable radio IC.

The problem is that the GP2 pin of the PIC would be connected to the DATA input (and programming) pin3 of the radio IC.
The whole circuit is running off 3v7 lipo battery.
My question is will the PIC GP2 output be destroyed when programming the radio IC. ?

Thanks in anticipation....

Dave

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michaelkellett over 1 year ago in reply to davebullockmbe +2

You can set GP2 as an input to prevent it from loading the radio pin during programming: From the Microchip data sheet. 5.2 TRIS Registers The Output Driver Control register is loaded with the contents…

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0 dougw over 1 year ago

Could you use a Schottky diode in series to protect the PIC?
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0 davebullockmbe over 1 year ago in reply to dougw

HI thanks for your considered replies. I had thought about a jumper but board space is too tight. Maybe I can make room for a 0402 schottky diode though. I was hoping I would get away without reworking the board but you have confirmed my doubts. Thanks Dave
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0 davebullockmbe over 1 year ago in reply to dougw

HI thanks for your considered replies. I had thought about a jumper but board space is too tight. Maybe I can make room for a 0402 schottky diode though. I was hoping I would get away without reworking the board but you have confirmed my doubts. Thanks Dave
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0 dougw over 1 year ago in reply to davebullockmbe

You might also need a pull down resistor unless you can just short out D2.
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0 dougw over 1 year ago in reply to davebullockmbe

Actually, you could replace R6 with a diode and D2 with a resistor. Then you would just need a jumper to the data pin (and a cut to the original path).
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