I used TCA8418 in my custom product and connected 75 keys as matrix.
I used IC in polling mode. Read every 1msec to detect key.
At power on, all key detection is proper.
But after fast pressing or random pressing, at some moment there is following problem occurs:
In key matrix, those keys which are in C2-C10, those cannot give any response.
But if I pressed C1 (where 4 pins connected, any one of 4 keys), IC will give response and after that C2-C10 keys also gives response.
If i reset IC, then after also IC working.
My observation during issue:
- I2C working OK.
- IC working OK with only C1 column keys
Please support me on that. Is there in software issue or IC bug?