INPUT 0.3VDD--0.7VDD

RE: INPUT 0.3VDD--0.7VDD

Hung Bui — Wed, 21 Dec 2016 08:57:54 GMT

It should not matter Andy, you can test with the setup with PIN3.

RE: INPUT 0.3VDD--0.7VDD

zcmm — Wed, 21 Dec 2016 00:53:51 GMT

Configuration Pin3 or PIN4？

RE: INPUT 0.3VDD--0.7VDD

Hung Bui — Tue, 20 Dec 2016 11:32:56 GMT

Hi,

I don't see a problem with your schematic.

Could you try these 2 hex file, measure the current consumption and let me know what you observe ?

In the hex I simply flip the configuration between input and disconnect buffer.

Hex1.hex

Hex2.hex

RE: INPUT 0.3VDD--0.7VDD

zcmm — Tue, 20 Dec 2016 09:16:19 GMT

how to send pcb and schematic for you?

RE: INPUT 0.3VDD--0.7VDD

Hung Bui — Tue, 20 Dec 2016 09:10:31 GMT

I tried here, but didn't see the issue.

It doesn't make much sense on why setting a pin as input should cause extra current.

I suggest to test on a pin that doesn't connect to anything. You can try to switch the pin configuration from input to disconnected (disable input buffer), say every second and observe if the current consumption change accordingly every second or not.

Also what would be the behaviour if you use pull up or pull down ?

you may want to provide the schematic of your board. I don't understand what is R1 and R2 for, what is Vr2.

RE: INPUT 0.3VDD--0.7VDD

zcmm — Tue, 20 Dec 2016 08:58:03 GMT

how to send pcb and schematic for you?

RE: INPUT 0.3VDD--0.7VDD

Hung Bui — Tue, 20 Dec 2016 08:36:30 GMT

@zcmm: Please provide a schematic, layout and a photo of your setup.

RE: INPUT 0.3VDD--0.7VDD

zcmm — Tue, 20 Dec 2016 07:09:10 GMT

PIN 4 have same question.Current is not from external device. i use VCC 2.9v ->R1-> R2-> GND.Vr2 to Pin 4,when Vcc = 2.9V,R1 = 200K, R2=100K,current is 50ua R2=1M,current is 2ua.you can try it.

RE: INPUT 0.3VDD--0.7VDD

Hung Bui — Thu, 15 Dec 2016 10:23:00 GMT

Please test on another pin. Also please provide a close up photo of your setup and how you measure the current consumption. You can also check if there is current going from your external device to the chip via pin 3 or not.

RE: INPUT 0.3VDD--0.7VDD

zcmm — Thu, 15 Dec 2016 10:16:43 GMT

yes,I use a minimal example which just setting the pin as input and do nothing but sleeping,But it is still anomal. other pin not test

RE: INPUT 0.3VDD--0.7VDD

Hung Bui — Thu, 15 Dec 2016 10:14:59 GMT

Have you tried with a minimal example ?

If you test on another pin do you have the same result ?

RE: INPUT 0.3VDD--0.7VDD

zcmm — Thu, 15 Dec 2016 10:10:05 GMT

i have not use interupt.when i disconnect input buffer,it is normal current.

RE: INPUT 0.3VDD--0.7VDD

Hung Bui — Thu, 15 Dec 2016 10:08:29 GMT

Hi,

How do you handle the pin ? Do you set any interrupt when the pin changes it level ?

If you create a minimal example which just setting the pin as input and do nothing but sleeping, would you see the issue ?