TPL5110 & HT7833 & ESP32-C3-13 MCU combination problem

[ogedik]

Are you using a DevkitC now? That has a bunch of stuff on it that also uses power; don't use that if you want to get the power usage of only the ESP32C3; use a module or the raw chip instead.

Hi ESP_Sprite,

Very good approach. You are exactly correct! I will try to use only ESP32C3 as you suggested. Then I will analyze and reply with my results. Thank you for your help

Additionally, independent from ESP32 issue, why there's a huge current difference on HT7833 between my readings and reference value on datasheet without any load? Does it make any sense?

I am in learning curve Thank you your patience.

Best regards,

Orkun Gedik

[MicroController]

A 1K resistor will pass 3.3mA @ 3.3V, so if R4 and R5 are 1K each, together they will drain about 6.6mA. Not much of a difference while the ESP is active, but when it's in deep sleep R4+R5 will continue to draw 100x as much current as the sleeping ESP

[MicroController]

I attached resistor between legs because of CAPS cannot drain its power as fast as enough to the circuit (time constant calculation). If I do not attach resistors, ESP do not really turn off and able to find enough power to continue its process,

C4: 2200 uF capacitor

This is a huge capacitor in this case; too big by a factor of 100-1000.

Also, the HT7833's dropout voltage is specified as 360-500mV, so input voltages below 3.3V+0.5V = 3.8V can cause issues; and its other specs are only given for Vin>=Vout+1V...

[ogedik]

I attached resistor between legs because of CAPS cannot drain its power as fast as enough to the circuit (time constant calculation). If I do not attach resistors, ESP do not really turn off and able to find enough power to continue its process,

C4: 2200 uF capacitor

This is a huge capacitor in this case; too big by a factor of 100-1000.

Also, the HT7833's dropout voltage is specified as 360-500mV, so input voltages below 3.3V+0.5V = 3.8V can cause issues; and its other specs are only given for Vin>=Vout+1V...

Hi MicroController,

Thank you so much for your precious information with crystal clear explanations. I learned a lot by your feedbacks, too. Now, I feel more safe while making amphere calculation of my circuits. I am just curious about one thing that is there any kind of formula/calculation about how much uF capacitor required for ESP32 WiFi with 3.7 LiPo?

As far as I understand from your suggestion that ESP32 and HT7833 combination with 3.7v is not good enough.

Now I will setup a new circuit with raw ESP32 as ESP_Sprite suggested without resistors and make new calculation with your suggestions. Then share my analyze result here.

Thank you again

Best regards,

Orkun Gedik

[ogedik]

Hi,

I redesigned my circuit with ESP-C3-13 module according to your suggestions. My readings are 17 uA now in deep sleep which is perfect. ESP_Sprite and MicroController both you are my hero!

Thank you for your great insights.

Best regards,

Orkun Gedik