ESP32 Forum

Hi,

I am designing a sensor board powered by ESP32-C3-13 MCU. In order to supply 3.3v and 500mA, I used HT7833. And turning on and off circuit by using TPL5110.

The problem that I faced is TPL5110 do not send DRV signal to Q1 transistor and consequentially cannot power up ESP32 MCU. To solve this problem I attached 1000uF capacitor on 3v3 and GND pins over ESP32. Now it is poering up but not stable. And additionally do not keep turned off for a while as configured by R1 resistor.

Please find my circuit diagram attached to the message.

Whant may cause the problem? Anybody can give a suggestion to run circuit stable?

Thank you for your help.

Orkun Gedik

The diagram does not make sense.
There is a MOSFET directly connecting 3v3 and GND?
Also note that the TPL5110 is supposed to be used with a P-channel MOSFET in the supply line while your diagram shows an N-channel MOSFET.

Also note that the ESP32-C3 has a pretty good deep sleep mode, so the extra chip possibly is unnecessary.

@MicroController: You are exactly correct. This is copy and paste problem from my previous circuit design. It was TPL5111 which use N-channel MOSFET. I attached updated diagram into the message.

@ESP_Sprite: Yes you are correct. But, TPL5110 is consuming ~35 nA whereas ESP32-C3-13 MCU is consuming ~5uA in deep sleep mode if I am correct. Circuit has additional sensors also. To control power on circuit, I need extra chip such TPL5110.

Thank you for your support.

Best regards,

Orkun Gedik

You're obviously free to implement this in whichever way you desire, but for your application, I'm not sure the 35nA/5uA difference matters... with a 24K resistor, your ESP32C3 will wake up every minute. At that rate, the discharge rate of your LiIon is majorly dominated by the time the ESP32-C3 is awake; the addition of the TPL5110 will only add a negligable amount of battery life, especially given your HT8833 also has a 4uA quiescent current. (Note you can also turn the external peripherals by switching a PMOS to power them using a GPIO of the ESP32C3, or if they use less than 40mA even power them off one of the GPIOs of the ESP32C3 directly.)

Hi ESP_Sprite,

You are great! Thank you for your precious suggestions I will make a research regarding your recommendations.

Best regards,

Orkun Gedik

ESP_Sprite wrote: ↑

Thu Jul 20, 2023 1:55 am

You're obviously free to implement this in whichever way you desire, but for your application, I'm not sure the 35nA/5uA difference matters... with a 24K resistor, your ESP32C3 will wake up every minute. At that rate, the discharge rate of your LiIon is majorly dominated by the time the ESP32-C3 is awake; the addition of the TPL5110 will only add a negligable amount of battery life, especially given your HT8833 also has a 4uA quiescent current. (Note you can also turn the external peripherals by switching a PMOS to power them using a GPIO of the ESP32C3, or if they use less than 40mA even power them off one of the GPIOs of the ESP32C3 directly.)

Hi ESP_Sprite,

I made a research and setup a new circuit based on ESP32-C3-13 Kit MCU supplied by HT7833. Please find my readings on multimeter below. I attached multimeter probes between positive output of battery and positive input of circuit while measuring current;

HT7833 consumption without any load: 7.41mA
ESP32-C3-13 in deep sleep mode + HT7833 with ESP32 load: 10.46 mA

R3, R4, R5: 1K resistor
C1: 10uF capacitor
C2: 10uF capacitor
C3: 4.7uF capacitor
C4: 2200 uF capacitor
U1: HT7833

As far as I read on datasheet HT7833 consume 4uA quiescent and ESP13-C3-13 kit MCU 5uA in deep sleep, but the numbers that I measured are so different with addressed values on datasheet. Do I have something wrong? Do you have a suggestion about the values?

By the way I will have an oscilloscope this week and measure the current again.

Best regards,

Orkun Gedik

R3? R4 and R5 connect 3v3 to GND?

Another note: Disconnecting 3v3 power from the MCU will cause trouble/current if any of the IO pins is still connected to a positive (signal) voltage from another chip/device.

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.

n

MicroController wrote: ↑

Sun Jul 30, 2023 12:13 am

R3? R4 and R5 connect 3v3 to GND?

Another note: Disconnecting 3v3 power from the MCU will cause trouble/current if any of the IO pins is still connected to a positive (signal) voltage from another chip/device.

Hi 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, if I turn off and turn on circuit
by switch (which not present over schema) in a second. Are 1K resistors make a huge difference over current load? I suspect about this because I see huge amount of difference with reference values presented on datasheet and my readings.

If you have another practice to drain caps I would be glad to hear this.

On the other hand; your last note is so precious too. I will take into account this with my analysis also. Thank you

Best regards,

Orkun Gedik