Lithium Ion battery indication by led through voltage measurement

[Vindhyachal.takniki]

1. Have to make a led level indicator of lithium battery of 7.4V (two cells in series of 3.7V each).
Led level indications are 0-20,40,60,80 & 100% i.e by 5 leds.

2. Need to make it simple by voltage measurement only. Voltage range of battery pack is 5.7V to 8.4V. Need to break that into 5 different voltage ranges & then indicate by led. 

3. I know voltage measurement is not accurate way, but in most application its good enough & I ave to keep simple in this application.

4. Currently doing it by MSP430G2553 MCU & its working fine, but I was thinking is there any dedicated IC available for this, need to be real low power?
Problem with MCU is everytime I have to burn program in it.

Check lots of chinese power banks, they have some dedicated IC, but there parts number are not traceable or available on net.
Any low power ic solution for this?

[Nusa]

Search for "bar display driver".

[JohnnyMalaria]

How about something like this (it's a kit):

https://www.tindie.com/products/kuzyatech/lm3916-led-bargraph-vu-meter-pick-your-color/

[sleemanj]

https://www.maximintegrated.com/en/products/power/battery-management/DS2788.html

(that was the first result for googling "battery fuel gauge IC led display", there are more)

[Vindhyachal.takniki]

1. I need a switch also, when it is pressed led should indicate for 2-3 seconds.
2.Maxim IC is bit expensive.
3. Can we intergrate switch with LM3916 also, so that when switch is pressed only then led are glown for 2-3 seconds, then again everything goes into low power mode

[mikerj]

The BQ34Z100-G1 is an impedance based fuel gauge IC which is about half the price of the Maxim part.  Note that the LM3916 bargraph driver is obsolete.

[krish2487]

A little homework can go a long way in helping you yourself...

 


 


Its not hard to take away from the wonderful video dave made ages ago and make a 5 step bar graph or whatever you would like to do..