AnsweredAssumed Answered

Is LLS available in K22F?

Question asked by Alexander Farley on Sep 19, 2018
Latest reply on Sep 28, 2018 by Daniel Chen

I'm working with a Kinetis MK22FX512AVLQ12 in a KDS project, using Processor Expert. 

 

Right now, I am trying to verify the MCU's power usage in LLS mode. Datasheets for the K22 suggest that LLS is a valid mode for this MCU, for example see p.10 and p.11 of this document:

https://www.nxp.com/docs/en/data-sheet/K22P144M120SF5V2.pdf 

 

Table 6 calls out Id_LLS as the current consumption in LLS mode. 

 

AN4470 lists LLS as a distinct low-power mode as well, distinct from VLLS1/VLLS2/VLLS3 modes. 

 

However, AN4503 does not show LLS as a mode in Figure 4:

http://cache.freescale.com/files/32bit/doc/app_note/AN4503.pdf 

 

Why is that?

 

Additionally, the reference manual lists LLS3 and LLS2 as valid modes, but does not mention LLS:

https://www.nxp.com/docs/en/reference-manual/K22P121M120SF8RM.pdf 

 

Why is that?

 

The reason I'm asking is because I'm attempting to enter LLS using the following PE command:

Cpu_SetOperationMode(DOM_STOP, NULL, NULL);

 

But I'm measuring 7mA to my board, which suggests that we're not actually in LLS mode. 

Outcomes