topic Re: STM comparator and timer equivalence pin in Kinetis Microcontrollers

STM comparator and timer equivalence pin

jhd — Thu, 04 Jul 2019 16:14:31 GMT

Hello,

I need use this stm pins of the comparator in kl05.

PA0.Signal=COMP1_INM6
PA1.Signal=COMP1_INP
PA4.Signal=COMP1_INM4
PA5.Signal=COMP1_INM5

Wich is the equivalence in MKL05Z32VFK4? In the datasheet only is possible to found CMP0_INx and CMP0_OUT. It's ok if I use only the inputs? CMP0_IN0 up to CMP0_IN3 ?

And I have the same problem with the Timers: I have used from TPM0_CH0 up to TPM0_CH5. It will work?

STM32 KL05

PA7	PA7.Signal=TIM1_CH1N	PTA5	TPM0_CH5
PA8	PA8.Signal=S_TIM1_CH1	PTB9	TPM0_CH2
PA9	PA9.Signal=S_TIM1_CH2	PTB10	TPM0_CH1
PA10	PA10.Signal=S_TIM1_CH3	PTB11	TPM0_CH0
PB0	PB0.Signal=TIM1_CH2N	PTA6	TPM0_CH4
PB1	PB1.Signal=TIM1_CH3N	PTB8	TPM0_CH3

Best regards

EDITED: I think that COMPx_INMx is the negative and the COMPx_INP the positive but in NXP is indifferent?

Re: STM comparator and timer equivalence pin

jhd — Thu, 04 Jul 2019 20:39:12 GMT

Can I connect this so?

REF_BUS ----> CMP0_IN0

REF_C ----> CMP0_IN1

REF_B ----> CMP0_IN2

REF_A ----> CMP0_IN3

With the stm chip is connect so:

REF_BUS ----> COMP1_INP

REF_C ----> COMP1_IM6

REF_B ----> COMP1_IM5

REF_A ----> COMP1_IM4

Re: STM comparator and timer equivalence pin

mjbcswitzerland — Thu, 04 Jul 2019 23:06:27 GMT

The KL05 compartor has a number of inputs that can be selected to be CMP+ or CMP-. That means that there are not inputs which are dedicated CMP+ or CMP- and you thus have full flexibility.

The TPM channel pins, when programmed to operate as channel inputs, can be programmed to be rising, falling or both-edge sensitive, so also don't have dedicated positive/negative pins.

Regards

Mark

Complete Kinetis solutions for professional needs, training and support: http://www.utasker.com/kinetis.html
Kinetis KL02/KL03/KL05:
- http://www.utasker.com/kinetis/FRDM-KL02Z.html
- http://www.utasker.com/kinetis/FRDM-KL03Z.html
- http://www.utasker.com/kinetis/FRDM-KL05Z.html

uTasker: supporting >1'000 registered Kinetis users get products faster and cheaper to market
Request Free emergency remote desk-top consulting at http://www.utasker.com/services.html

Open Source version at https://github.com/uTasker/uTasker-Kinetis

Re: STM comparator and timer equivalence pin

jhd — Thu, 04 Jul 2019 23:16:18 GMT

Thank you very much Mark, I supposed that but I was not sure.

Best regards

Re: STM comparator and timer equivalence pin

mjbcswitzerland — Thu, 04 Jul 2019 23:20:58 GMT

The STM32 COMP1 is similar to the CMP in the KL05 in as much as it can compare two inputs at a time.
That means that if you have been using the COMP1 to compare REF_BUS as the positive input with the negative inputs REF_A, REF_B and REF_C it will be polling the three by changing the negative input MUX.

In the case of the KL05 you can exactly the same thing.

Regrds

Mark

Note: uTasker based projects developed on STM32 parts can run on Kinetis parts by changing just the project define _STM32 to _KINETIS and redefining the pin connections to match the alternative device. Most HAL interfaces are compatible so application code can run on either.