name: HT6221 function: Multi-Purpose Encoders package: DIP/SOP20,20 manufacturer: Holtek +--()--+ R1 | 1 20| AIN R2 | 2 19| C1 R3 | 3 18| C2 R4 | 4 17| C3 DOUT | 5 16| C4 VDD | 6 15| C5 D7 | 7 14| C6 X2 | 8 13| C7 X1 | 9 12| C8 VSS |10 11| LED +------+ This pinout came from the Chipdir: http://www.chipdir.org/