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Questions tagged [fuel-gauge]

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

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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 ...
tronhawk's user avatar
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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 ...
Alexander Ohm's user avatar
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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 ...
Ali's user avatar
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1 answer
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Can you use just a battery monitor for charging? (instead of a charging specific ic as well) [closed]

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 ...
Matthew3302's user avatar
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110 views

What should I consider to integrate a battery fuel gauge in my circuits?

I am trying to include a fuel gauge with I2C or SPI communication to the circuits that use battery, but it is confusing for me which of all the options I should use, for example, I usually use 3.7V @ ...
WalterPH's user avatar
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79 views

MAX17260 after shutdown state

I am using the MAX17260 and during shpping set it to shutdown state the battery is always connected to the MAX17260. do we need to update the MAX17260 register after exiting from shut down mode?
Avi Keret's user avatar
1 vote
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67 views

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....
smyffe96's user avatar
1 vote
1 answer
492 views

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 ...
dmvs's user avatar
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226 views

Ground reference with DW01 and MAX17048

I have designed a project that includes a TP4056 with DW01 protection ic and porwer sharing feature. Now I want to include a fuel gauge and the only one I have found is MAX17048 I have readed the ...
Emirikol's user avatar
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2 answers
121 views

Duplicating fuel and oil sender resistances

I have a generator I would like to add remote fuel level and oil pressure displays to. The senders feed into a DGC-2000. My original idea was to plug the existing oil and fuel signals into an Arduino, ...
joshua0823's user avatar
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273 views

How to edit data flash variables in BQ34Z100 fuel gauge IC with an MCU?

I have an 8s Lifepo4 battery pack ,I am using an TI BQ34Z100 fuel gauge Ic to calculate the soc of the battery pack but to configure the Ic for my battery pack I have to change the data flash ...
IMEI's user avatar
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How are these MOSFETs used as a voltage divider in this circuit?

I am a beginner in electronics. I generally code and write software. This is for one of my projects. We are trying to use the Texas Instruments BQ34Z100 fuel gauge IC to measure state of charge (...
IMEI's user avatar
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1 answer
173 views

Can't find formula to calculate resistor values for a BQ34Z100

I am designing a BMS board using the BQ34Z10 fuel gauge IC. From the datasheet BQ34Z100 datasheet figure 8-3 I am unable to figure out how to calculate values for R2,R3,R4. I am designing the system ...
Adithya's user avatar
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LTC2944 shorting

So I am using a LTC2944 battery fuel gauge IC. When a 48V(nominal) Li-Ion battery is connected to measure, the IC shorts. When I measure the battery voltage using a multimeter it is 52.6V which is ...
Adithya's user avatar
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68 views

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 ...
A.H.Z's user avatar
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2 votes
2 answers
437 views

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 ...
roli's user avatar
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Battery charging circuit with fuel gauge monitoring. Always measuring a discharging current

I have designed and produced this simple schematic of a circuit that's supposed to charge a LiPo battery from a 5V source through the MCP73831 controller while measuring the SoC with a MAX17260 fuel ...
Alex's user avatar
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Questions about Li-Ion batteries

I am working on integrating single 4.2V Lithium battery(400mAh capacity), charger IC, and battery fuel gauge for an embedded project. I have watched several TI training videos about battery management,...
UserRR's user avatar
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121 views

Scaling a 0-90 ohm range to 10-520

The fuel sending unit in my car operates within a range of 10-520 ohms. I want to replace this unit for one that runs in a range of 0-90 ohms. I'm assuming I will need something to compute the change, ...
Michael Lowry's user avatar
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1 answer
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What is the maximum current can pass in BQ40Z50R2 (fuel gauge IC?)

I am unable to find the maximum current this fuel gauge IC can pass from its datasheet. Can anyone tell me?
Mohan Khedkar's user avatar
-1 votes
1 answer
252 views

Fuel Level Sensor Safety

I'm looking up fuel level sensor manufacturers (Omnicomm, Technoton etc) and noticed that a lot of them offer capacitive fuel sensors for all types of fuel. However, based on my understanding, ...
AbdurRehman Khan's user avatar
2 votes
2 answers
2k views

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 ...
NRai's user avatar
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3 votes
0 answers
382 views

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 ...
Joe Baker's user avatar
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2 votes
1 answer
427 views

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'...
Chin's user avatar
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2 votes
1 answer
2k views

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,...
Quade's user avatar
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4 answers
1k views

STM32F103C8T6 - I2C communication with TI FuelGauge BQ78350

I am trying to establish communication between TI BQ78350 FuelGauge and STM32F103C8T6 using I2C/SMBus. The following is the I2C configuration used for the standard HAL I2C library. ...
Singaram Venkatachalam's user avatar
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1 answer
602 views

NiMH Batteries and Fuel Gauge

I'm currently trying to figure out the best way to make use of my gas gauge LTC2943-1 in conjunction with my pack of NiMH batteries. I am aware that voltage alone is not a sufficient measure of the ...
JimJammer's user avatar
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1 answer
286 views

State of charge estimation

Which is a more accurate estimation of SOC between different versions of Kalman filter vs advanced Fuel gauge ICs such as the ones from Texas Instruments (Impedance Track algorithm) or Maxim ...
Kartik Shanbhag's user avatar
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124 views

Passive Cell balancing affecting Gas Gauge Coulomb Count

I am designing a solar 7.4V Li battery charger, and want to include gas gauging, and cell balancing. If I use passive cell balancing, I waste power and cause my coulomb counter to lose count. Is there ...
Boone Angel's user avatar
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1 answer
2k views

What is difference between Qmax and Design Capacity of battery parameters?

I'm working with the BQ27742-g1 (Texas Instruments) Fuel Gauge. I have some confusion about battery parameters. What is Qmax and Design capacity? Are they the same or different? What is the ...
Kalarav Parmar's user avatar
0 votes
2 answers
827 views

I2C Communication Signal Issue

hello to all, I'm working on I2C Based Communication Device bq27742-g1(Texas Instrument) Battery fuel gauge which is Slave Device address is 0xAA. I have put in the 10K pull up resistor. In this I'...
Kalarav Parmar's user avatar
-1 votes
2 answers
671 views

Read Fuel Tank level voltage and send via Wifi [closed]

In most cars the fuel level is measured by a floater connected to a potentiometer and it's quite likely that the panel is reading an analogue voltage signal coming from the fuel sender unit. What ...
RonEskinder's user avatar
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1 answer
1k views

Dual Fuel Senders - Shared Fuel Gauge Circuit Help

Just planning should I ever convert a car to run dual fuel i.e. Petrol and LPG/Autogas and decided I don't much like the way the gauges are done in most installations, so I decided I wanted to find a ...
lil_bugga's user avatar
-1 votes
1 answer
354 views

Battery SoC measurement

I am designing an instrument powered by two series AA NiMH, NiCd, or alkaline batteries, I need to display remaining battery capacity on it, so I was wondering what the best way to do it is. I ...
MiguelB's user avatar
0 votes
1 answer
488 views

Mysterious Trace in Battery Fuel Gauge Datasheet

I'm using a lipo battery in a project, and I want to include a sophisticated battery fuel gauge in my design. I have a battery input stage with a TI BQ24072 charge management IC and a linear down-...
John M's user avatar
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1 vote
1 answer
227 views

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 ...
vini_i's user avatar
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