Kinetis MicrocontrollersのトピックRe: How to draw 5V from TWRK64F120M Elevator Connector?

How to draw 5V from TWRK64F120M Elevator Connector?

broccolee — Wed, 26 Jul 2017 17:58:20 GMT

Hi,

How do I draw 5v from the elevator connector pins A1 and B1? They're always under voltage, around 4.4V...

Here are my specs:

- TWR-K64F-120M

- MK64FN1M0VMD12 chip

- KDS 3.2 IDE

- MQX 4.2

- OPENSDA USB

Thanks.

Re: How to draw 5V from TWRK64F120M Elevator Connector?

Hui_Ma — Thu, 27 Jul 2017 06:38:57 GMT

Hi,

The NXP tower system power could from MCU Module or Tower Elevator:

More detailed info, please check AN4390.

The TWR-ELEV PRIMARY board schematics could get from here.

Wish it helps.

Have a great day,
Ma Hui

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Re: How to draw 5V from TWRK64F120M Elevator Connector?

broccolee — Thu, 27 Jul 2017 15:47:34 GMT

Hi Hui Ma,

Thanks for your response.

Again, my question was:

How do I draw 5v from the elevator connector pins A1 and B1? They're always under voltage, around 4.4V.

If you could demonstrate that on the actual hardware, that would be great. For example, if you could show me the changes you made to the hardware or in the software, along with a screenshot from an oscilloscope or a multimeter reading a 5v when probing pin A1 or B1, that would answer my question.

Thanks.

Re: How to draw 5V from TWRK64F120M Elevator Connector?

Hui_Ma — Fri, 28 Jul 2017 02:03:01 GMT

Hi,

I do a test at TWR-ELEV PRIMARY board:

Test 1: 5V power from external DC power supply:

Test 2: 5V power from USB port:

Wish it helps.

Have a great day,
Ma Hui

Re: How to draw 5V from TWRK64F120M Elevator Connector?

broccolee — Fri, 28 Jul 2017 02:28:10 GMT

Thank you, Hui Ma, I really appreciate you doing that.

But, what I meant was, how do I get 5v from A1 and B1 from this configuration or can it be done:

Thanks.

Re: How to draw 5V from TWRK64F120M Elevator Connector?

Hui_Ma — Fri, 28 Jul 2017 09:09:43 GMT

Hi,

Please check my comment below(based on TWR-K64F120M board schematics):

Below is the MSS1P3L parameter:

Have a great day,
Ma Hui

Re: How to draw 5V from TWRK64F120M Elevator Connector?

broccolee — Mon, 31 Jul 2017 17:45:47 GMT

This shows that it is impossible to draw 5v from pins A1 and B1.

With the external connections, I am also only getting around 4.7 - 4.8v. By the time I have connected an IMU, the IMU is reading below 4.7v, which is just below operating range.

Oh well, thanks anyway, Hui Ma.