https://community.nxp.com/t5/Power-Management/FS45-VCCA-without-capacitor-will-cause-RSTB-cannot-pull-High/m-p/1892492#M3572 <P>HI&nbsp;</P> <P>VCCA本质上是个LDO，LDO最小系统是由CIN/COUT 组成的，假如缺少了COUT LDO 便不能正常工作，FS也会报错，另外：</P> <P>VCCA is a linear voltage regulator mainly dedicated to supplying the MCU I/Os, especially<BR />the ADC reference voltage.</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>&nbsp;</P> Mon, 24 Jun 2024 02:01:42 GMT guoweisun 2024-06-24T02:01:42Z https://community.nxp.com/t5/Power-Management/FS45-VCCA-without-capacitor-will-cause-RSTB-cannot-pull-High/m-p/1892480#M3571 <P>Hi,</P><P>I don't need VCCA feature, here's my circuit. After testing, it requires a capacitor connect VCCA to GND, so that it can work properly. What's the possible reason may cause this issue?&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Eason_L_0-1719193011633.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/285335i8F029F75965A2F5A/image-size/medium?v=v2&amp;px=400" role="button" title="Eason_L_0-1719193011633.png" alt="Eason_L_0-1719193011633.png" /></span></P><P>&nbsp;</P> Mon, 24 Jun 2024 01:38:56 GMT https://community.nxp.com/t5/Power-Management/FS45-VCCA-without-capacitor-will-cause-RSTB-cannot-pull-High/m-p/1892480#M3571 Eason_L 2024-06-24T01:38:56Z https://community.nxp.com/t5/Power-Management/FS45-VCCA-without-capacitor-will-cause-RSTB-cannot-pull-High/m-p/1892492#M3572 <P>HI&nbsp;</P> <P>VCCA本质上是个LDO，LDO最小系统是由CIN/COUT 组成的，假如缺少了COUT LDO 便不能正常工作，FS也会报错，另外：</P> <P>VCCA is a linear voltage regulator mainly dedicated to supplying the MCU I/Os, especially<BR />the ADC reference voltage.</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>&nbsp;</P> Mon, 24 Jun 2024 02:01:42 GMT https://community.nxp.com/t5/Power-Management/FS45-VCCA-without-capacitor-will-cause-RSTB-cannot-pull-High/m-p/1892492#M3572 guoweisun 2024-06-24T02:01:42Z