ESP32-PICO-D4 Low Power ?????

tabulous
Posts: 34
Joined: Thu Nov 14, 2019 8:58 am

ESP32-PICO-D4 Low Power ?????

Postby tabulous » Wed Jun 24, 2020 9:32 am

Hi im trying to achieve low power state using this code.

void app_main(void)
{

while(true)
{
ESP_LOGW(TAG, "Going to sleep now!!");
vTaskDelay(5000 / portTICK_PERIOD_MS);

esp_sleep_enable_timer_wakeup(10 * 1000000);
esp_deep_sleep_start();
}
}

When ESP is running(240Mhz) it is around 40mA from 3.0V supply. Once it enters deep sleep, current is still 2mA ??????

To note nothing is intialised in my application as you can see, so how do i get down to the micro-amps that the datasheet quotes ????

ESP_Sprite
Posts: 3720
Joined: Thu Nov 26, 2015 4:08 am

Re: ESP32-PICO-D4 Low Power ?????

Postby ESP_Sprite » Wed Jun 24, 2020 11:20 am

What hardware are you using? Devboard, own PCB, ...? How do you measure the power use?

tabulous
Posts: 34
Joined: Thu Nov 14, 2019 8:58 am

Re: ESP32-PICO-D4 Low Power ?????

Postby tabulous » Wed Jun 24, 2020 1:45 pm

Its custom hardware, but im powering only the MCU ive isolated all the rest of the circuity. Thus a board without the MCU pulls around 5-10uA.

Current measurement is using standard Multimeter in series on the high side.

Yes i know this is technically not the best way, but it should at least give me an idea, and that idea is currently way too high.......

Software is built using IDF 4.0.

Is there anything in the bootloader that could /needs to be set ?

ESP_Sprite
Posts: 3720
Joined: Thu Nov 26, 2015 4:08 am

Re: ESP32-PICO-D4 Low Power ?????

Postby ESP_Sprite » Wed Jun 24, 2020 6:30 pm

Any chance of pullups/pulldowns eating into your power budget?

tabulous
Posts: 34
Joined: Thu Nov 14, 2019 8:58 am

Re: ESP32-PICO-D4 Low Power ?????

Postby tabulous » Thu Jun 25, 2020 11:41 am

So to ensure nothing on my target board can have an effect on the ESP32 current, i've just built another board.
This board only has the ESP32, two de-coupling caps( 10uf, 100nf ) on the VDDA, and a 32Khz crystal(with 12pf CL caps).

I can now see the current is down to 500uA, but this to me is still high ???

So this says to me a standalone ESP32-PICO-D4 cannot achieve sub 100uA deep sleep.....

tabulous
Posts: 34
Joined: Thu Nov 14, 2019 8:58 am

Re: ESP32-PICO-D4 Low Power ?????

Postby tabulous » Fri Jun 26, 2020 10:08 am

Little update as support on here is slow at the best........

I'm finding these devices are very, very sensitive, my board which was giving 40mA run / 0.5mA deep sleep, is now deep sleeping at 28mA.

This can only be chip silicon damage.......
Having worked with(over 20years) manufactures like STM, Renesas, Microchip, Infineon etc i can honestly say ive never seen anything like this......

And when the support is well, lucky if you get one response a day, its not something i'll be looking at for high volume commercial applications.....

WiFive
Posts: 2951
Joined: Tue Dec 01, 2015 7:35 am

Re: ESP32-PICO-D4 Low Power ?????

Postby WiFive » Fri Jun 26, 2020 11:29 am

If you have a high volume commercial application and you go through official b2b channels (sales@espressif.com) you should get better support. Also it is a holiday in China now.

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