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Questions tagged [brownout]

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0
votes
1answer
32 views

Soft-power on/off with ATMega/Relay causes brown-outs and unexpected voltages

This questions consists of two parts. Background I'm designing a digitally controller class D amplifier. Main IC's are a TI TPA3116D2 Class D amplifier, a TI PGA2311 volume control and an ...
0
votes
3answers
97 views

how to avoid brownout caused by a multimeter on esp32

I am using the VOLTCRAFT VC130 multimeter for measurement of current through my esp32. The microcontroller runs perfectly with two 1.5V batteries(~3V as read by multimeter in voltage mode). But when I ...
0
votes
1answer
40 views

What is technical difference (internal voltage) between Digital multimeter's current measuring ranges mA (milliampere) and A(ampere)?

Is there any difference in internal power supply (DMM's) while knob turned to mA and A. While measuring current in my microcontroller-module with keeping mA on DMM, I am getting brownout detected (...
9
votes
1answer
171 views

Do the new “PB” variants of ATmega have a bug in the brown-out detector?

We've been using ATmega48/88/168/328 microcontrollers successfully for many years in many of our products. We have now considered to switch from the A and PA variants to the new PB variant (because we ...
2
votes
3answers
83 views

why is this microcontroller brown-out level detection at 2.6V and 3.4V

The default brown-out detection level for the ATmega32u4 is 2.6V (typical) in the range of 2.4V to 2.8V. The table of possible values: ...
0
votes
1answer
76 views

How to simulate ~1ms long power interruption

I am looking to test an embedded system for its behavior during power interruption soon after power on. The system is supplied with 15V DC power with a steady state draw of <...
0
votes
2answers
92 views

Handling power loss in a Microcontroller

I am trying to save the context of a microcontroller during a power loss. I already have a detection circuit which tells the microcontroller about the power loss. During a power failure, I needed some ...
2
votes
1answer
191 views

ATMega328P Programs at 2V but not at 1.8V

I'm perplexed by this one: I'm trying to run my ATMega328P at 1.8V. The voltage at the chip (pin 4 and 21) sits at 1.82V (BK Precision Multimeter). When using the AVRISP mkII, the programmer LED ...
1
vote
1answer
72 views

Getting brownouts when using MCU controlled P-FET to switch power to another board

I have an MCU connected to a logic level P-FET(part no AO3401A). The source is wired to a 3.3V regulator that also feeds the MCU. The drain is wired to an LED and a header that connects to a second ...
-2
votes
3answers
169 views

Adding capacitance across USB power pins? [closed]

It's not as good as putting it in the hub but it's a quick lazy attempt. For keeping devices (Raspberry Pi for example) from experiencing brownouts on the order of milliseconds in duration which ...
1
vote
0answers
86 views

ATmega328P current drawn when in Brown out

I'm experimenting with an ATmega328p on a breadboard using the standard Arduino bootloader. I'm looking at the power consumption as I want to power the device from a solar panel and a large cap. I've ...
-1
votes
3answers
331 views

Should I unplug devices when there's a power outtage? [closed]

My friends always tell me to unplug my devices during a 'brownout' (it's what they call power outage here in my country. In some places they call it blackout). Why should I be? Is the voltage or maybe ...
1
vote
1answer
134 views

Brownout Mitigation

I've got a system problem where the power up of one module causes the system at large to brown out, ostensibly because of inrush current to that module. Things kind of recover into a stable ...
1
vote
1answer
278 views

2 DC Motors and 18 Micro Servo motors from shared battery (6 AA batteries?), active monitoring?

I'm trying to power 2 DC Motors and 18 Micro Servo Motors with a microcontroller as a kind of Arduino-like board. Any help would be very appreciated! I'm looking for opinions on my current plan and ...
0
votes
0answers
832 views

How to recover from a brown out on STM32L0

I'm using STM32L0. My firmware operates at 2V. These are stepped down from 24V. If I have a short of the 24V for a short period of time this causes a brown out on my 2V the voltage begins to oscillate ...
5
votes
1answer
7k views

Atmega328P - How is brown-out-detection supposed to work?

[SOLVED][UPDATE]: The problem was with fuse bits. Somehow the fuses were being incorrectly written as 0xFE rather than 0xFD. FE corresponds to 1.8V and thus arduino board was working down to 1.8V. I ...
1
vote
1answer
62 views

Minimizing mosfet interactions and overshoots. A case study

I'm back again with another headache of my own creation. It seems I'm constantly learning things the hard way. Straight to the point questions: I've noticed that my reverse voltage protection ...
5
votes
2answers
250 views

Engine cranking corrupts SPI driven 7segment display

I am driving six 7-segment displays with SPI using MAX7219 and ATmega128. This is for displaying various engine parameters like rpm, oil pressure etc. for large marine diesel engines (>100 kW). The ...
0
votes
1answer
198 views

5v led string going brown!

I am installing 5V 1903 chip 3-wire LED-strings in model buildings and have constant issues with Brown-outs and getting white to be #)*% white. Have also used WS2011 which are pretty similar and cross ...
1
vote
1answer
120 views

Voltage Supervisor IC for PIC

Im using a DS1233A IC with a battery (Li-Ion 4V) powered PIC18F26J50. The battery powers a LM1117 3.3V regulator. The problem i have is when lights go out for long period of times, the battery ...
0
votes
3answers
1k views

Brown Out Problem in Raspberry Pi Over Power Tether Cable

I am in the middle of making my own ROV with six DC motors as the thrusters. The main controller inside the ROV is a microcontroller that is connected to Raspberry Pi that can send and receive ...
32
votes
7answers
10k views

In what situation should I keep the Brown-out Detection feature OFF on a microcontroller?

When the power supply on a microcontroller falls under a certain threshold, a brown-out conditions occurs and RAM memory may get corrupted. Provided that every power down sequence of the circuit can ...
1
vote
1answer
350 views

MSP430 GPIO behaviour on power off

I have a simple circuit which contains an MSP430 connected to a DAC8551. I'm using PORT1 so have implemented a bit-banging approach instead of using the USCI module (bad, I know). I've noticed a ...
3
votes
2answers
1k views

What could cause unexplained brownout resets?

Context I'm building a 7kW bidirectional two-stage switching converter. Each stage has its own control board and processor. The entire system runs off a common 24V rail. Isolation stage Two H-...
5
votes
3answers
5k views

Minimum voltage to avoid EEPROM corruption for ATMega328P

I have a battery powered contraption with an ATMega328P with Arduino code that sleeps most of the time. Occasionally it needs to write some values to EEPROM. It's battery powered so I have tried to ...
3
votes
2answers
3k views

Brownout (low voltage) Detection on msp430F2274

I work on a Texas Instruments msp430f2274 with a battery. I want to know, when the supply voltage is low. I found information about a "Supply Voltage Supervisor" but apparently it is not present in ...
6
votes
3answers
390 views

Using reset controllers with modern microcontrollers

Are reset controllers necessary for modern microcontrollers, such as the LPC2138 or 9S12XD256? Most ARM processors I have seen have their own brown-out detectors and reset properly, and I don't see ...
19
votes
2answers
25k views

What is a brownout condition?

I'm reading the datasheet of this DAC. Page 27 states: In many industrial process control applications, it is vital that the output voltage be controlled during power-up and during brownout ...