Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [fuel-gauge]

used to indicate the level of energy contained in a storage device compared to its maximum level

38 questions
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Sense resistors in system-side Li-Ion charger/gauge circuit

I'm working on designing a charger and fuel gauge circuit for a premade 3S3P Li-Ion battery pack. The battery pack has basic protection circuits onborad (over/undervoltage and a PTC) and only the pack positive and negative leads are exposed to the…
Joe Baker
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MAX17320 going into permanent fault upon restart

I've been trying to create a new battery pack for an old (and long discontinued) Sony product. Luckily the battery pack in question uses standard smart battery specification. So I've designed a new PCB and instead of using the old fuel…
roli
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Configuring fuel gauge IC (BQ35100) with USB-I2C converter

I want to use TI's BQ35100 fuel gauge IC for my circuit. As per this instructional video, I would need an evaluation board and a communications interface adapter to configure the IC. Could I just use a simple USB-I2C converter (e.g. this Adafruit…
NRai
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MAX17205 DevName reading wrong, but other default value is correct. Why?

I am using the battery fuel guage MAX17205 through I2C bus. The Device Name register that I read from it seems have a different value than what the datasheet states: I am reading a 0x2a7c, but it's meant to have a LSB of 0x5. In the Datasheet…
Chin
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Fuel sender - need something to convert ohms to volts?

I need to connect a cars fuel sender(ohms) to a analog input on a GPS tracker (volts) Here's the catch, in our tests most fuel senders we worked with seem to send the data as ohms/resistance However, the GPS trackers analog inputs require volts…
Quade
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Can I use a MAX17262 to measure battery capacity of a 300mA 3.7V Lipo?

First, I a very basic understanding of lithium based batteries and from what I have learned, gauging their capacity can be quite complex. I was looking into MAX17262 as a fuel gauge to measure the capacity of a 300mA 3.7V LiPo battery. Looking…
tronhawk
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Is it possible to measure state of health momentaneously on LTC (Li-SOCl2) batteries mid lifetime?

I'm developing a product that uses LTC Li-SOCl2 batteries, a D-cell bobbin type. I would very much like to be able to take an unclear battery from my desk or some old/demo device and get an idea of its state of health. Is that theoretically…
Alexander Ohm
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Can you use just a battery monitor for charging? (instead of a charging specific ic as well)

Would a fuel gauge IC that also monitors voltage and temperature be enough for monitoring a NiMH battery during charging and discharging? Charging ICs monitor just voltage and temperature so I think using a fuel gauge IC that sends data to the main…
Matthew3302
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adding a low fuel light

im wanting to add a low fuel level light to my car. it has a fuel gauge, 33 ohms full 270 ohms empty. the tank has two terminals, one to the body for ground and one directly into the back of the gauge. I've been doing a bit of research and…
smyffe96
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MAX17048 wrong SOC readout

I have a LiPo battery connected to my device and to the MAX17048 chip. Battery has a cut-off voltage 2.75V. Unfortunately, the IC does not detect the SOC level properly, see the example read log of the chip below Sat Sep 24 23:40:01 CEST…
dmvs
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How do Fuel gauge ICs compensate for battery aging?

I came across this Fuel gauge IC recently and although I understand how the SOC is determined, I do not understand how the age compensation constant(the one used to determine the actual SOC) is derived. I would like to know how the number of…
A.H.Z
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What makes this voltage regulator special?

I'm working on digesting the data sheet for the Texas Instruments bq34z100-g1 fuel gauge IC. I'm looking to use this chip with a 2 cell lithium polymer battery pack. If using a multi cell pack the data sheet recommends using the following voltage…
vini_i
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HAL_I2C_Mem_Read library does not add the 8th bit (LSB) for the reading bit. It is 0 no matter which address i put, why?

I am using the HAL_I2C_Mem_Read library to read a register value but the last bit (8th bit) in the slave address is always 0 no matter which slave address I put. I use the Fuel Guage MAX17320 with a microcontroller STM32F105 to read and write…
Ali
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Issue with getting battery capacity from DS2782 fuel gauge IC

I am using a 5100 mAh Li-ion battery pack connected to the load setup which has a DS2782 IC on board. I flashed the fuel gauge parameters into these registers (address 60h-7Ah). These values are supposed to be written into the EEPROM…
Shravya Boggarapu
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MAX17048 - battery characterization data feeding

We are trying to use very common fuel guage - MAX17048. Multiple projects says that this chip will work as-is in your measurement of battery SOC/voltage and give accurate reading. From what i know, every fuel guage needs to be fed with specific…
Atharva Upadhye
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