RTOS/CC3220MODA: CC3220MODx Schematics and Hardware design files.

Hi Zac,

I'm a little confused on what you're looking for. We provide the design files for the launchpad and some of the related TI designs to assist with your own custom board development.

The device datasheet should explain the details behind the device and any added features: www.ti.com/.../cc3220moda

There are additional documents on the device page to guide you as well: www.ti.com/.../technicaldocuments

Best,
Kevin

Hi Kevin,

I am doing my development using CC3220MODA and would like to know the mandatory connections / components required for its functioning. I would like to know the components used inside CC3220MODA in addition to the main CC3220 chip like the pull up / pull down used, the resistors and the filters already present.

For example,
1) For SOP0, 1 and 2, should I use external pull down of 100K ?
2) For VBAT1 and 2 should I add 0.1uF filters or are they already present in CC3220MODA ?
3) For VBAT_RESET and nRESET, should we have some default connections ?

The reason I have asked is because, I have been experiencing boot loop (board keeps resetting) intermittently and wanted to ensure that my connections are fine.

Pardon me if I am asking too many questions. Appreciate your support.

Thanks
Zac

Hi Kevin,

Thanks a lot for the details. I have gone through the link and the "Typical Application" really help.
Just to re-ensure that my understanding is correct about CC3220MODA, could you please review below points and confirm.

1) SOP0, 1 and 2 can be let unconnected for normal boot (no pull up or pull down is necessary). i.e their connections are required only for flashing, factory reset and other configurations ?
2) VBAT_RESET can be connected to VBAT1 and VBAT2. However, this is not necessary if use a switch for nReset?
3) .1 uF filters are required for VBAT1 & VBAT2. Are these really necessary if we use higher values caps for VCC (power supply)?
4) TI recommends a 2.7K pull down / pull up for GPIO stability during power cycle. Is it not very strong which cause much leakage?

It would be great if you also can list some known behavior if the above conditions are not met.

Appreciate your support.

Thanks
Zac

Hi Zac,

Glad it was helpful!

1. Pull-down is necessary since you want to ensure the pins are in a defined state

2. VBAT_RESET needs to be pulled-up, ensure it is in a defined state

3 and 4. You should follow the recommendations on the schematic

We do not test behaviors outside of the recommendations made. I suggest following the suggestions to prevent any unintended behavior.

Best,
Kevin

Hi Kevin,

Thanks for your response. Your first point seems to be confusing.

As per the "Typical Application" schematics in the datasheet for CC3220MODA, all CC3220MODx and CC3220MODAx modules contain internal pull down resistors on the SOP[2:0] compared to the normal CC3220 schematics. I guess the module version(MODA) of CC3220 already have them embedded.

Since the default mode is 000, I guess the existing pull downs will ensure this ? Please confirm.

Thanks
Zac

Hi Zac,

Yes, you are correct! The CC3220MODA has internal pull-downs embedded unlike the CC3220.

Sorry for misinforming you initially.

Best,
Kevin

Thanks Kevin. Appreciate your support.