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TCA9535 Interrupt

Sudip Saha
Prodigy 105 points
Other Parts Discussed in Thread: TCA9535, MSP430F5529

Hi,

I am using TCA9535 in my project to interface a keypad to uController (MSP430F5529). The interrupt pin of TCA9535 is connected to (Interrupt enabled) input pin of uController. I have observed that when a key is pressed the interrupt goes low, however when the uController reads the input registers of TCA9535, interrupt line does not become high always.

The datasheet says when the registers are read, the interrupt line will go high. Sometimes, this does not happen and it becomes problematic for the key detection (scan) code that I have implemented.

Any clue on this issue?

Regards,

Sudip Saha