About "BCM20737S" GPIO Input hysteresis

[Anonymous]

About "BCM20737S"

Is there hysteresis circuit in input pin?

I read datasheet but it doesn't show anything about it.

If the document about this exists, I need it.

Thank you.

[Anonymous]

BCM20737 datasheet describes VIL and VIH.

BCM20737 SOC Data Sheet

[Anonymous]

Thank you for your answering!

But I need information about hysteresis behavior not only threshold..

I need to know is there schmitt trigger in the gpio. and if it is in input pin, I need to know detail about it.

thank you.

[MichaelF_56]

There is some level of detail in this thread regarding using the API to control hysteresis: GPIO usage in WICED Smart SDK

If that is not sufficient, we will need to ask around to see if the chip developers can assist.

[Anonymous]

Is this resolved?

I think the datasheet already provides necessary information.

If no, please tell me what exactly you need.

[Anonymous]

kawamura Is the datasheet enough?

[Anonymous]

>dmiya, kwang

Sorry for late reply .

I checked the thread and I saw the information below,

1.   /// iocfg_p0[13] controls the hysteresis of the following GPIOs p[0:25], p[30:39]; 
2.     /// iocfg_p26[13] controls the hysteresis of the GPIOs p[26:29] 
3.     GPIO_HYSTERESIS_MASK         = 0x2000, 
4.     GPIO_HYSTERESIS_ON           = 0x2000, 
5.     GPIO_HYSTERESIS_OFF          = 0x0000,

this part of description means we can change High and Low threshold changing these value(GPIO_HYSTERESIS_MASK,GPIO_HYSTERESIS_ON,GPIO_HYSTERESIS_OFF)?

[Anonymous · Accepted solution]

Hello Yuichi,

The hysteresis affects all GPIOs - For example, turn hysteresis on for P26, then P26:29 are affected.

Does that answer your question?

Thanks

JT

[Anonymous]

Dear sir

Thank you for answering, I wanna know whether I can change threshold revel by changing GPIO_HYSTERESIS_ON and GPIO_HYSTERESIS_OFF?

Thanks

[Anonymous]

No. It's just a setting of switching it on and off.

Do you exactly want to change threshold level of GPIO?

I still can't figure out what you want to do.