Apologies if I offend. On Monday, February 3, 2014, Luis Moreira wrote: > Hi Denny, > Not everybody that shows an interested on a chip used in a key fob is > trying to circumvent it or indeed is requesting any support from the list > to do so. > Your comment is completly unnecessarily. > > Luis > On 3 Feb 2014 21:14, "Denny Esterline" > > wrote: > > > Google suggests that a HCS412 is a KEELOQ=AE Code Hopping Encoder and > > Transponder from Microchip. > > http://ww1.microchip.com/downloads/en/DeviceDoc/41099D.pdf > > (which was aimed primarily at the car fob market) > > My best guess is that the 1 at the end is the temperature range. (see > page > > 49) > > Could also be a customized version for some large volume OEM, but I dou= bt > > it. > > > > BTW, these are security devices... trying to circumvent it not > recommended > > or supported by this list. > > > > -Denny > > > > > > > > On Mon, Feb 3, 2014 at 1:38 PM, Luis Moreira < > > luis.moreira1575@googlemail.com > wrote: > > > > > Hi Guys, > > > Looking for some info on a microchip device, the part number on it is > > > HCS4121. I not even know what it is, I presume it is a microcontrolle= r > > or a > > > dedicated frequency generating chip. A datasheet would be nice. > > > This is from a car remote fob. > > > Thank you. > > > Best Regards > > > Luis > > > -- > > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > > > View/change your membership options at > > > http://mailman.mit.edu/mailman/listinfo/piclist > > > > > -- > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > > View/change your membership options at > > http://mailman.mit.edu/mailman/listinfo/piclist > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .