topic mcf5225x  ADC pins in ColdFire/68K Microcontrollers and Processors https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/mcf5225x-ADC-pins/m-p/275545#M11860 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>I've been loading the example ADC program that come with MQX 3.8.1 on to my m52259demo board.&nbsp; It's working on screen (via serial).&nbsp; However,&nbsp; I'm having a tough time actually sampling anything.&nbsp; I don't know how it was set up.&nbsp; Primarily, I understand that your ref voltage pins are based on what you write to the CAL (power reference) register.&nbsp; I have tried connecting AN2 to the board's 3.3v output and AN6 to the board's ground and to the supply's negative terminal.&nbsp; I then connect AN0 to the supply's positive terminal.&nbsp; Is this the correct way of setting it up.&nbsp; There's no changes when I vary the DC power supply's voltage.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>On the other hand, I can't even touch the Vrl and Vhl pins.&nbsp; They come straight off the microprocessor. </P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>Can anyone with experience with the ADC program that comes with this MQX help?&nbsp; Cheers</P></BODY></HTML> Fri, 11 Oct 2013 12:44:13 GMT KriendDay 2013-10-11T12:44:13Z mcf5225x  ADC pins https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/mcf5225x-ADC-pins/m-p/275545#M11860 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>I've been loading the example ADC program that come with MQX 3.8.1 on to my m52259demo board.&nbsp; It's working on screen (via serial).&nbsp; However,&nbsp; I'm having a tough time actually sampling anything.&nbsp; I don't know how it was set up.&nbsp; Primarily, I understand that your ref voltage pins are based on what you write to the CAL (power reference) register.&nbsp; I have tried connecting AN2 to the board's 3.3v output and AN6 to the board's ground and to the supply's negative terminal.&nbsp; I then connect AN0 to the supply's positive terminal.&nbsp; Is this the correct way of setting it up.&nbsp; There's no changes when I vary the DC power supply's voltage.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>On the other hand, I can't even touch the Vrl and Vhl pins.&nbsp; They come straight off the microprocessor. </P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>Can anyone with experience with the ADC program that comes with this MQX help?&nbsp; Cheers</P></BODY></HTML> Fri, 11 Oct 2013 12:44:13 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/mcf5225x-ADC-pins/m-p/275545#M11860 KriendDay 2013-10-11T12:44:13Z