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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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0answers
33 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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1answer
43 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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1answer
80 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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0answers
69 views

Any Issues Getting BeagleBone Black Wireless to run off of LiPo with Diode Fix?

This helpful question pointed me into the right direction for powering the BBB with a 3.7V LiPo battery. However, as this answer demonstrated, I won't be able to give the WiFi/BT module power in doing ...
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0answers
34 views

MAX17205 battery pack fuel gauge configuration

I am working on the fuel gauge by MAX17205 for my project. https://www.maximintegrated.com/en/products/power/battery-management/MAX17205.html I am able to communicate with the chip using I2C protocol ...
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4answers
174 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. ...
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0answers
57 views

Fuel level sensor

I want to continuously monitor the fuel level in this HONDA GX35 tank, as shown below. Can anyone suggest me an appropriate sensor for this ? P.S. : The tank is very small of 0.65L capacity. :(
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1answer
162 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 ...
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1answer
88 views

cheap charge management + protection circuit or fuel gauge + protection circuit

I would like to know if it is possible to have in the same package a fuel gauge ic + a protection circuit for lipo battery, or a charge management + protection circuit, in the same package. I have a ...
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1answer
126 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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0answers
80 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 ...
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1answer
398 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 ...
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2answers
335 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'...
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2answers
396 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 ...
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1answer
471 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 ...
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1answer
145 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
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1answer
235 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-...
1
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1answer
156 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 ...