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issue in using TXB0108

Sen Lin
Prodigy 10 points
Other Parts Discussed in Thread: TXB0108

Hi, 

We met issue in using TXB0108. See below for sch...

The original purpose of this design is to detect push action of key . Voltage level of PortB of TXB0108 is 3.3v and PortA is a 1.8v system.

With this design, I suppose when key is not pushed, the AP, which is set as input high, should detect a high. And when key is pushed, the 1.8V AP GPIO should detect a low. 

Real tests here show, after power-up, when key is not pushed, GPIO can detect a High. And when 1st time it is pushed, GPIO can detect 1.8v. But after this 1st-push action, no matter how the key is pushed or release, GPIO can only detect LOW..

Please advice...

Thx.