Inside there is a single chip (ADAM41P2728G), I think it's this one http://www.etachips.com/data/shorform/s ... 1P2728.pdf .
5 test pads, including I2C interface (?), labeled as "PORT WRITER PIN" (GND, SCK, SDA, VPP, VDD). Looks like this 4-bit MCU has 16kB (or 24kB ?) MTP program memory; perhaps someone will/want try to reprogram his remote
. Can't find detailed datasheet for it, though..