Other NXP Products中的主题 Re: Rotary Encoder Interfacing with PCAL9722

Rotary Encoder Interfacing with PCAL9722

mk031 — Fri, 08 Aug 2025 11:09:40 GMT

We are going to use Rotary incremental Encoder (Quadrature output) via SPI to IO Expander.

As Rotary Encoder requires Interrupt pin to interface, can you please Confirm whether it is possible to interface Rotary Encoder with PCAL9722 I/O Expander?

Does PCAL9722 supports interrupt on Rising as well as falling edge?

Thanks in advance!

Re: Rotary Encoder Interfacing with PCAL9722

ErikaC — Mon, 11 Aug 2025 17:45:05 GMT

Hello,

Yes, the PCAL9722 supports interrupt functionality that can be configured by level or edge, and each interrupt can be cleared individually without affecting other interrupt events.

For more details, please refer to Section 6.4.12 – Interrupt Edge Registers (60h to 65h) in the datasheet.

Hope this helps!