INA219:

Shamita Chandekar

Part Number: INA219

I want to read only the voltage of battery connected. Below is the picture of the connections I made. Battery voltage is 3.7v but I'm getting different values every time when i read shunt voltage (0x01) register which has huge difference. Is there any mistake in my connections?? Please guide me.

Connections

Output

read 256 0x100 0b100000000

read 65535 0xffff 0b1111111111111111

read 256 0x100 0b100000000

read 512 0x200 0b1000000000

Thanks in advance!!

over 3 years ago

+1 Mitch M over 3 years ago

TI__Mastermind 22135 points

Hello Shamita,

The shunt voltage register is for measuring the voltage difference across a shunt resistor to measure current levels, and it based off of the difference in voltage between IN+ and IN-. If you are simply wanting to know the voltage of the battery connected, then you will want to read register 0x02, which is the bus voltage (measured from the IN- pin).

0 Shamita Chandekar over 3 years ago in reply to Mitch M

Prodigy 20 points

Thanks Mitch, this resolved my issue. Now I'm trying to read the current and voltage together. Here if I change the connections like if I connect IN+ to positive terminal of battery then how does it read voltage?

0 Louis L over 3 years ago in reply to Shamita Chandekar

TI__Expert 4200 points

Shamita,

It appears you created an additional thread here.

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

Amplifiers

Amplifiers forum

INA219: