Chip PIN1 pin: The small dot is the starting mark point of the pin, and the larger one on the symmetrical angle is the "release" design after the IC package, which belongs to the packaging process requirement.
LQFP-44 package and QFP-100 package
The package is different, the position of pin 1 is also different
PLCC-44 package
Turn counterclockwise , the one near the black dot "." is 1 pin
Put the back of the chip (the side with the lettering) facing up and the notch (or a vertical line) to the left. The first pin at the bottom left is pin 1, and then counterclockwise is pin 2, 3, 4...pin;
If it is a small dimple, the foot facing the dimple is 1 foot, and then counterclockwise is 2, 3, 4... feet.
SIP
DIP
ZIP
PGA
PLCC
QFP
