Questions tagged [battery-operated]
Involving or pertaining to a circuit or device that is intended to be operated with cells or batteries (as opposed to mains power, for example).
866 questions
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MCP7940N Real Time Clock IC - Treatment of MFP pin when running from VBAT
My design uses a MCP7940N real-time clock/calendar chip to schedule periodic activity based on dates and times. The chip features a pin "MFP" which can be configured as an alarm output.
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Is DW01 tolerant against a reverse battery connection?
I'm designing a circuit powered with a 18650 battery, and a CN3791 charger. I'm considering to add a protection IC for the battery. I see there are models like DW01, AP6683, FM2113, XB8089, etc; and ...
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How do I add more battery capacity to power an RFID logger?
I know very very little about electricity but I have a problem that hopefully can be solved.
I have RFID loggers that I would like to have run for a longer time. The current set up is an 8 pack of AA ...
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5 V for ESP32S3 from Both Battery/Buck Converter and USB port for Programing
I have a 3S LiIon battery pack, so ~12 V, connected to an MPM3610 buck converter to produce 5 V for an ESP32S3 DevKit C-1. I need to also have a USB cable (with 5 V) attached to the ESP32S3 for ...
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Efficient IR LED driver for 56 kHz pulses (100 mA) from 2×AA (1.8–3 V), MCU powered directly from battery
I’m working on a battery-powered IR communication project and I’m looking for advice on the most suitable LED driver topology / IC given some fairly strict energy and signal-integrity constraints.
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How to Choose a LED with the Proper Lumen Output for a Handheld Decoration?
I am currently developing a handheld Christmas tree PCB decoration. On the front, it will have roughly a dozen green SMD LEDs in the shape of a Christmas tree. However, the shear number of options for ...
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Can rechargeable AA batteries (four or more) power a USB LED strip broken up with some wires for a costume I'm working on?
I'm very new to this, and have no experience with most things electrical, so apologies if this is very basic. However, I am trying to make a TRON costume. To that end, I have the following materials:
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Safety isolate STM32 from SRAM when power to SRAM drop?
I have an MCU connected to external SRAM (the SRAM powered from battery only and the MCU from another constant supply).
The interface to SRAM is QSPI with max frequency of 104MHz.
I can't guarantee ...
- 551
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Connecting two batteries in parallel
I am building a POC with two COM-15208 buck-boost boards (5V/3.3V from 3.7V LiPo). Daily draw: ~1825 mAh (~76 mA avg).
I have two 10000 mAh batteries available with me and I want to parallel two ...
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TPL5111 System timer questions regarding to edge detection
I'm using the TI TPL5111 in one-shot mode to enable an LDO for about 30Min.
My mission is to start counting 30Min when I detect falling of signal EXT_IND.
According to the TPL5111 datasheet, the ...
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How do I hook up LED lights to a battery pack with switch? [closed]
I got this cool picture that was previously wired with lights. I would like to get it working, but don't know how to safely do it.
It has a switch on the frame that has 3 pins I think, also looks like ...
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When might computers be at different voltages and have electricity flowing through the USB to equalize? & How to connect battery PSU eGPU via USB?
I want to power an eGPU with an external battery and connect it via USB to my laptop. My plan is to use a 12.8 V or 25.6 V LiFePO4 battery and use some type of converter I have not been able to find ...
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What to use for switching low voltage/low current with 3.3V
I am designing a little battery (small 1 cell lipo) powered device which will use an ESP32 micro to do some wifi things. Most of the time the ESP32 will be in sleep, but occasionally it will wake up ...
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MCP73871 Low Output Voltage When Using Battery
I designed a board based on the MCP73871 (datasheet) that seems to not output a proper voltage when the only source is the battery. Here is the schematic. Note that, during the described testing, I ...
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Problem Statement: I²C Ground Isolation with Series Battery Cells (ULIN13-01 + PIC18LF4520)
We are using a ULIN13-01 smart battery, which internally consists of two 15V Li-ion cells. The battery has an integrated I²C interface, and we are using a PIC18LF4520 microcontroller to communicate ...
