CC3220: LPDS wakeup from GPIO

ron jacoby

Part Number: CC3220

im working on implementing LPDS mode on a custom board.

to begin with, im trying the power_management demo from sdk 2_20_00_10, using tirtos on the launchxl board

the demo works as expected in always connected mode,

the problem i have is that i cant get the mcu to wakeup from button push SW2. i defined an interrupt handler for it which is working in normal mode.

should i change anything in parkInfo or gpioPinConfigs from the default values ?

question #2 - our custom board is 1.85V, should LPDS and gpio wakeup work just as in 3.3V?

question #3 - it seems that a fix was applied to the RTC wakeup for tirtos, but not for freertos which im using, will it be available soon ?

thx

ron

over 8 years ago

0 Toby over 8 years ago

TI__Mastermind 35070 points

Hi ron,

1.
Please refer to this post: e2e.ti.com/.../2592071
You need to define separate handler to be called when device is woken from LPDS via GPIO.
Also, check the other relevant fields in PowerCC32XX_config (details in the post provided).

2.
Yes, if it meets specs from datasheet, section 5.6 on power: www.ti.com/.../cc3220.pdf
Your VBAT should be between 2.1 and 3.6 V. If the power_measurement example is working fine, I would expect your set up to be ok.

3.
Can you refer to where this was brought up?

Regards,
Toby

0 ron jacoby over 8 years ago in reply to Toby

Intellectual 750 points

3. e2e.ti.com/.../2561700

0 ron jacoby over 8 years ago in reply to Toby

Intellectual 750 points

hi Toby

just to clarify - we have 1.85V connected to VBAT, will this work ?

0 Toby over 8 years ago in reply to ron jacoby

TI__Mastermind 35070 points

If direct battery connection, VBAT must be between 2.1 and 3.6 V.
If using preregulated mode, VBAT should be 1.85 V.

Check section 4.4 of datasheet ( www.ti.com/.../cc3220.pdf ) for details.

0 ron jacoby over 8 years ago in reply to Toby

Intellectual 750 points

ive tested the GPIO wakeup from LPDS on our custom board - 1.85V and it does not work.

used the same wakeup function in wakeupGPIOFxnLPDS that works on the launchpad. is there any known issue with 1.85V preregulated mode with LPDS ?

secondly, the RTC wakeup from LPDS doesnt work when using FreeRTOS. tested this using the always_connected use case of power measurement on the launchpad.

ron

0 Toby over 8 years ago in reply to ron jacoby

TI__Mastermind 35070 points

There are drawbacks if using 1.85V preregulated, although probably unrelated to wakeup:

- e2e.ti.com/.../640786
- e2e.ti.com/.../696822

The launchpad is using 3.3 V (in the wide voltage range of operation), and have logic levels indicative of such.

Please make sure that the signal for the interrupt are ok (table 4.9 of datasheet).

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CC3220: LPDS wakeup from GPIO