Kinetis Software Development KitのトピックPower down ADC https://community.nxp.com/t5/Kinetis-Software-Development-Kit/Power-down-ADC/m-p/505281#M4971 <HTML><HEAD></HEAD><BODY><P>I've created a project that sets up the ADC16 to read a value 4 times a second triggered by a lptmr interrupt.&nbsp; I go into VLPS mode once I've done my processing for each ¼ second interval and wait for the next lptmr interrup to occur but my power drwa is still way higher than I expected and I think a big part of that is becuase the ADC is still enabled.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>I'd like to power down the ADC when I have done with it but then power it back up each ¼ second to take my reading.&nbsp; Is there a simple way to achieve this that does not involve going through all the initialization and calibration routines?</P></BODY></HTML> Thu, 26 May 2016 17:53:16 GMT tedmawson 2016-05-26T17:53:16Z Power down ADC https://community.nxp.com/t5/Kinetis-Software-Development-Kit/Power-down-ADC/m-p/505281#M4971 <HTML><HEAD></HEAD><BODY><P>I've created a project that sets up the ADC16 to read a value 4 times a second triggered by a lptmr interrupt.&nbsp; I go into VLPS mode once I've done my processing for each ¼ second interval and wait for the next lptmr interrup to occur but my power drwa is still way higher than I expected and I think a big part of that is becuase the ADC is still enabled.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>I'd like to power down the ADC when I have done with it but then power it back up each ¼ second to take my reading.&nbsp; Is there a simple way to achieve this that does not involve going through all the initialization and calibration routines?</P></BODY></HTML> Thu, 26 May 2016 17:53:16 GMT https://community.nxp.com/t5/Kinetis-Software-Development-Kit/Power-down-ADC/m-p/505281#M4971 tedmawson 2016-05-26T17:53:16Z Re: Power down ADC https://community.nxp.com/t5/Kinetis-Software-Development-Kit/Power-down-ADC/m-p/505282#M4972 <HTML><HEAD></HEAD><BODY><P>Hi, Ted,</P><P>I am sorry for the delay.</P><P>I do not know the part number you are using, anyway, the ADC16 module is similar.</P><P>Regarding the ADC configuration for low power mode, I suggest you use Asynchronous clock to save power by setting ADC_CFG1[ADICLK]=2b11, while clearing the ADC_CFG2[ADCACKEN] and ADC_CFG2[ADHSC]. You can also set the ADC_CFG1[ADLPC] bit. If you set the ADLPC bit, I suppose that the ADC clock should be less than 4MHz.</P><P>Hope it can help you</P><P>BR</P><P>XiangJun Rong</P></BODY></HTML> Tue, 28 Jun 2016 09:04:23 GMT https://community.nxp.com/t5/Kinetis-Software-Development-Kit/Power-down-ADC/m-p/505282#M4972 xiangjun_rong 2016-06-28T09:04:23Z