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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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....
1 vote
1 answer
110 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 ...
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134 views

BQ34Z100-G1: Having problem with calibration after applying load

I have been working on BQ34Z100-G1 and having some problem with calibration of voltage and current. How I am doing the experiment: Soldered a brand new IC on my custom PCB. Calibration is working ...
0 votes
1 answer
54 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 ...
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2 answers
77 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, ...
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1 answer
92 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 ...
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0 votes
1 answer
65 views

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 (...
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0 votes
1 answer
58 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 ...
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0 answers
59 views

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 ...
1 vote
0 answers
61 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 ...
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2 votes
2 answers
237 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 ...
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154 views

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 ...
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1 answer
47 views

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,...
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1 answer
83 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, ...
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1 answer
50 views

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?
-1 votes
1 answer
201 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, ...
2 votes
2 answers
1k 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 ...
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2 votes
0 answers
281 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 ...
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1 vote
1 answer
322 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'...
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2 votes
1 answer
1k 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,...
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0 votes
4 answers
958 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. ...
0 votes
1 answer
465 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 ...
0 votes
1 answer
245 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 ...
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0 answers
112 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 ...
0 votes
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 ...
0 votes
2 answers
708 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'...
-1 votes
2 answers
604 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 ...
0 votes
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 ...
-1 votes
1 answer
252 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 ...
0 votes
1 answer
428 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-...
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1 vote
1 answer
205 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 ...
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