https://community.nxp.com/t5/LPC-Microcontrollers/LPC55S16-IO-Expander/m-p/1721672#M54075 <P>Hi,</P><P>Am using lpc55s16, how to configure IO pin to IO expander, kindly guide to the configuration process</P> Wed, 13 Sep 2023 05:44:32 GMT Sathiya_T 2023-09-13T05:44:32Z https://community.nxp.com/t5/LPC-Microcontrollers/LPC55S16-IO-Expander/m-p/1721672#M54075 <P>Hi,</P><P>Am using lpc55s16, how to configure IO pin to IO expander, kindly guide to the configuration process</P> Wed, 13 Sep 2023 05:44:32 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC55S16-IO-Expander/m-p/1721672#M54075 Sathiya_T 2023-09-13T05:44:32Z https://community.nxp.com/t5/LPC-Microcontrollers/LPC55S16-IO-Expander/m-p/1721745#M54079 <P>Hi,</P> <P>The LPC55S16 does not support I/O expander feature. For the LPC55S16, almost every signal is multiplexed with GPIO function, but the total GPIO pin number is totally dependent on package.</P> <P>If you want to expand I/O cell, you have to use the chip for example PCAL9554B or PCAL9554C which use I2C to expand I/O.</P> <P><A href="https://www.nxp.com.cn/docs/en/data-sheet/PCAL9554B_PCAL9554C.pdf" target="_blank">https://www.nxp.com.cn/docs/en/data-sheet/PCAL9554B_PCAL9554C.pdf</A></P> <P>it is okay to use a MCU with large package for example LPC54628, it has 208 pins, of course, a lot of GPIO pins.</P> <P><A href="https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/lpc54000-arm-cortex-m4-:MC_1414576688124" target="_blank">https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/lpc54000-arm-cortex-m4-:MC_1414576688124</A></P> <P>with each GPIO pin of LPC family, you can set or clear the pin logic in output mode, or input the pin logic in input mode.</P> <P>Hope it is helpful</P> <P>BR</P> <P>XiangJun Rong</P> <P>&nbsp;</P> Wed, 13 Sep 2023 06:51:15 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC55S16-IO-Expander/m-p/1721745#M54079 xiangjun_rong 2023-09-13T06:51:15Z