There is very little information given, to save a click through:

The CEO was (presumably forced to) resign for violation of the company's personal code of conduct policies but it's not being released what the violation was.

>Texas Instruments said Tuesday that CEO Brian Crutcher resigned for violating the company's code of conduct related to personal behavior... TI did not specify exactly what Crutcher did that violated company policies. He had been at the company for more than two decades before assuming the role of CEO.