Questions tagged [low-power]

Low-power refers to electronics that are designed to use less power than their common counterparts. This is often a requirement because of limited available power, as in battery operated devices, or in cases with limited cooling capabilities, as in notebooks.

Filter by
Sorted by
Tagged with
0
votes
1answer
407 views

Low Quiescent LDO vs. Buck Converter: Which is better for low power applications?

I'm stuck between choosing to use either a buck converter or a LDO voltage regulator for my heated glove project. The voltage regulator's function in question will be to power the microcontroller. ...
1
vote
1answer
65 views

Strange STM32L476RG GPIO behaviour when leaving STOP mode 2. Is it a silicon bug?

Before I enter the stop mode 2 I save all the GPIO MODER, OSPEEDR and PUDPR registers, configure pins as analogue (to save some power) and enter the STOP mode 2. When I exit the stop mode (I use RTC ...
0
votes
1answer
336 views

Advice on battery powered ESP32 with NFC Design

I'm new to PCB design (First one) and I want some advice and tips from more knowledgeable people in regard to basic design elements and especially the power consumption part. I want to make the ...
1
vote
3answers
82 views

Multiple rails I2C bus device from PMIC

I want to use a PMIC chip in my project. As any PMIC, it has a couple of outputs: buck Vout, and an LDO out. The PMIC is operated over the I2C bus. The MCU acts as the host device and runs on Vout, so ...
0
votes
1answer
54 views

MIC5216 Achieve minimum quiescent current draw

I have the MIC5216 as voltage regulator. I am regulating 2 18650 down to 5v in order to supply enough power to my circuit. I am using a 328p as MCU. The chip goes to sleep and is awoken again by an ...
1
vote
1answer
298 views

Converting Open-Drain to Active-High (low voltage, low power)

In my design, I need an RTC (PCF85263A) to enable a boost converter (TPS61021A) after the RTC alarm triggers an interrupt. The interrupt pin on the RTC (INTA) is open-drain, but the enable pin on the ...
0
votes
1answer
33 views

Advice on power section circuit

I'm designing a power section for my guitar pedal circuit that will supply power to my pedal using either a 9V power supply or a 9V battery. I'm using a switched barrel jack but I'm not sure if I have ...
0
votes
1answer
478 views

Reducing current consumption for a PIC16 in Sleep mode

This might appear as one of those tens of questions that ask about power consumption on a PIC microcontroller. But after I have failed to reduce the current consumption to an acceptable level despite ...
2
votes
1answer
132 views

Why different SOCs have different CPU power voltages for given frequency?

Recently, I studied dvfs tables for 3 SOCs: exynos8890(LITTLE cluster), exynos7880, snapdragon 625. Here is the result: octave source code The point is, that different SOCs with pretty same ...
2
votes
3answers
223 views

Why “Supports 5V VCC operation” appeared in LVC family datasheets?

Looking into the LVC logic chip family I was aure that it is 3.3 V supply devices. One of our fellows also confirms it here. This manual dated 1999 states that LVC is 5 V tolerant (version A), but not ...
0
votes
2answers
126 views

Watchdog with long on and off periods for microcontroller [closed]

I have a microcontroller (Arduino-like IoT device) and would like to connect a low power external hardware watchdog to be able to recover from failures. I know that a software watchdog is already ...
0
votes
0answers
33 views

Travel Photography 3.5V 3,6-4,8A LED Lamp powered by power bank

I travel a lot for my work as a photographer. For this I'm building a custom full spectrum lamp. I have no issue running my build with a normal adjustable power supply from my studio. To be able to ...
3
votes
1answer
74 views

Rectifying reversible polarity battery with minimal power loss

I'd like to build a battery-powered DC power supply that will accept a single-cell battery in either polarity (i.e. it doesn't matter which way you put the battery in). I'm thinking of using the ...
0
votes
1answer
62 views

Sleep vs low frequency

Some processors have a low frequency mode for using in low power mode. For example MSP430 microcontroller can work in both Normal clock frequency 16M Hz Low clock frequency 32 kHz I am wondering if ...
0
votes
0answers
39 views

Low power, low profile binary indicator

I am looking to find a way to communicate an alarm on a tiny device with a very low profile low power consumption component. The alarm is binary in nature, basically it is either on or off. LED does ...
5
votes
2answers
556 views

How to efficiently read a battery voltage level with ADC

There is a circuit powered by a battery (3V button cell) and another circuit with a microcontroller (Attiny85 in my case) reading perfectly the battery level (through ADC3 pin) each 5 minutes interval....
2
votes
0answers
92 views

Powering down parts of a pcb to conserve power, is it possible? Any caveats?

I'm building a USB 2.0 bus-powered STM32F429-based audio device that is able to run in a stand-alone mode from a phone charger, or running as a USB device when connected to a computer. To comply with ...
0
votes
1answer
93 views

How to power a device with a LIPO battery correctly

I have a little device which is normally powered by 5V 2A. But the manufacturer says it is compatible up to 16V 2A and I tested it with a powerbank which outputs 12V 2A. Sadly this powerbank is a bit ...
1
vote
2answers
54 views

Counting pulses in low power device

I have a mechanical water flowmeter with reed switch output and I connect it to my low power, battery powered device to count pulses. The reed switch is connected to my device via a 15 m long cable ...
0
votes
1answer
62 views

Understanding Low Power Solution

I have a device that is powered off of a large battery. This device has peripherial ICs on it that consume power. Right now I have the input voltage through a switching regulator to 5 volts and then ...
0
votes
1answer
65 views

Turn on power when voltage higher than set value

We are trying do design a circuit which works by harvesting energy from a split core current transformer. Most of the electronic works correctly, we use a 1.5F 5.5V SuperCap to provide enough power ...
0
votes
0answers
183 views

measure 4-20 mA and also power from loop powered

we know to give a command to an actuator in instrumentation we use 4-20 mA loop power. for reading this 4-20 mA I used the circuit below.so the problem is if my circuit only consumes 3mA, how should ...
3
votes
5answers
2k views

Diode type with lowest drop voltage [duplicate]

I make a small solar energy harvester. I'm searching for the type of diode with lowest drop voltage. Any suggestion for the type of diode for me ? Thank you
0
votes
1answer
182 views

Mosfet or bjt choice for low voltage joule thief application

I make solar energy harvester using joule thief circuit with a small solar cell as the input. The output voltage from the solar cell is 0,5V. But the generic transistor, exactly silicon material need ...
0
votes
0answers
146 views

Could i get some circuit design feedback?

I have a computer science background and this is the first circuit I've ever designed. It is a lot of fun designing these circuits, but it also always feels like I'm missing a lot of "obvious" common ...
2
votes
1answer
50 views

Measure power usage of battery powered device

I'm a software engineer by trade so I'm a bit at a loss. Maybe I don't know the correct words to find what I'm looking for. I have a Bluetooth Low Energy remote control powered by two AAA batteries. ...
1
vote
3answers
862 views

Turn on microcontroller by sensor, auto power off - how?

To minimize battery power consumption I want the microcontroller only to be powered when a sensor's output is high. After the microcontroller finishes a task, it should cut its power off again. I ...
1
vote
2answers
242 views

Diodes - minimum forward conduction current

I've been working on a GPS tracker which is intended to run/idle on a battery for an extended length of time (2+ years). The tracker uses an accelerometer (LIS3DH) and remains in a sleep state until ...
-4
votes
2answers
73 views

I want to boost 0.45V and 0.6mA to 0.7V and 3mA suggest me a circuit which can do that [closed]

I'm doing a project that basically transfer the power from a laser and light up an led using it. The power output we are getting from the laser is at most 0.45V and 0.6mA (we used photodiode to ...
0
votes
1answer
60 views

Increasing TPS63001 Under Voltage lockout from 1.8V to 2.5V for use with LiFePO4 cell

The Under Voltage Lockout threshold for this chip ranges from 1.5 V to 1.8 V. I want to use this with a LiFePO4 cell, whose minimum voltage is 2.5 V. With reference to the datasheet here, the VINA ...
-1
votes
1answer
81 views

Switching 1875 Volts through a relay

I am trying to create an electroadhesive device that I can switch on and off easily, however, after using one relay that worked beautifully to do this function, I went out and bought a 4 channel relay ...
0
votes
0answers
61 views

How to reach ultra low power on STM32Lxx?

I'm having some problem reaching the said ultra-low power available for the STM32Lxx series. With no active register, the UC should consume around 10 uA, but I can't get it down from 1 mA. The ...
0
votes
3answers
222 views

Ultra-low power sound/audio sensor for LOUD noises

I'm searching for a sound/audio sensor with ultra-low power consumption to detect the presence of a really loud noise (100dB+). The controller runs on battery and there is no option for a different ...
-2
votes
2answers
74 views

what is the right power supply switch for a sensor?

i'm trying to control my sensors power supply to reduce the current consumption of my project. i'm using ATmega328p that collect information from different sensors (digital and analog sensor) and send ...
-1
votes
1answer
107 views

How does Flash*Freeze reduce power consumption in Microsemi FPGAs?

Microsemi FPGAs are marketed as being low power. They have this flash freeze mode that is supposed to achieve much lower power dissipation, down to micro watts. I am trying to understand how exactly ...
0
votes
1answer
119 views

Where do I place the on/off switch in a multi voltage circuit?

I've got a simple Arduino setup where I need to supply a 3.3V Arduino with adequate power - and at the same time provide higher voltage to a sensor which needs 5V. The Arduino is powered by bypassing ...
1
vote
1answer
224 views

DC Current Measurement (resolution of ~ 1 uA)

I haven't worked with electronics in a long time, and now have the task of measuring the power consumption of a low-power device I'm writing firmware for... When the device is drawing very little ...
7
votes
4answers
1k views

What's causing this power spike in STM32 low power mode

I'm using an STM32L073RZ on a bare board with just the CPU and decoupling caps. I'm powering the board straight from an Otii Arc and measuring current consumption. I'm running MbedOS 5.11.2. When I ...
4
votes
3answers
891 views

How to debug current consumption with STM32 Nucleo board?

I'm trying to configure an STM32L011-Nucleo developement board to consume about 600 uA of current or so. It uses an STM32L011K4. The datasheet states that this should be possible if I drive the MCU ...
2
votes
3answers
203 views

Power small microcontroller from motherboard RJ45 ethernet port

I'm wondering if it's possible to power a microcontroller (e.g. ATmega328) from a Ethernet RJ45 motherboard port. Unlike USB, there is no power line, all pins/lines seem to be data only. I am ...
0
votes
0answers
1k views

STM32 L0 wake from STOP mode with WAKEUP pin

I am attempting to wake an STM32L073RZ from stop mode using WAKEUP_PIN_1. I'm running MbedOS 5.11. Unfortunately throughout all of the documentation (Mbed/STM) I ...
0
votes
0answers
33 views

Data communication in power harvesting project

I want to design a wearable gadget for elderly to detect falling. This gadget should work by energy harvesting. Now I want to find the best effitient way of power consumtion to send data to a station ...
2
votes
1answer
62 views

Low power device with high current peak

I'm creating power supply for controller that usually operates with very low power consumption, but sometimes needs high power. To make the situation harder there is "sometimes" external power present ...
0
votes
1answer
59 views

Harvest energy from ultra low current and high voltage source?

I have a sensor which can produce voltage upto 10 V but can only produce 50 nA of current. I tried to harvest energy using TI's BQ25570 evaluation board but the current is too low to kickstart the ...
0
votes
1answer
144 views

Power off detection circuit to close opened latching solenoid valve

The image above is referred from this SO link. My use case is the following: A latching solenoid valve, which would be run using 4 AA batteries (6V) Solenoid Valve (9 Ohm) operates at 6V under 40ms ...
1
vote
2answers
158 views

MSP430FR5994 SVSH Interrupt from LPMx.5

Background: I plan to use lpmx.5 under cap power but need a way to save the rtc registers to FRAM when the super-cap runs down. Plan: Use SYSRSTIV SVSH interrupt to wake up and save the counter, or ...
3
votes
1answer
149 views

Lithium thionyl chloride for GSM application

I'm trying o use a LiSoCl2 battery in a low power GSM application. When the system is in standby only the microcontroller(MSP430) is powered(3.3v) and the GSM(5v) and sensor(5v) is turned off. The ...
3
votes
0answers
79 views

Ultra low power battery

I am currently in the middle of a project and I am quite unsure of what type of battery and battery charger I should be using. To be honest I have never worked with battery or battery charger yet. In ...
3
votes
2answers
159 views

Can transformerless power supplies be UL/CSA certified and is there any specific standard they must meet?

I am trying to bias a linear optocoupler on the AC mains side of a circuit, in order to transfer analog information to the secondary side of the circuit. I have designed the following capacitive power ...
0
votes
0answers
159 views

Ultra Low Power, LDO Enable from RTC vs. deep sleep MCU interupt

I have a question regarding optimising design for ultra low power consumption device. I'm trying to develop a remote sensor node that should measure and send data every few hours. Currently I have an ...

1 2
3
4 5
15