Contents
What is bus voltage INA219?
Based on the maximum current of 3.2A and a maximum bus voltage of 26V, the INA219 can measure up to 3.2A * 26V = 83W of power.
How do you wire an ina219?
Connect to the circuit
- Connect V+ to the positive terminal of the power supply for the circuit under test.
- Connect V- to the positive terminal or lead of the load. This puts the sense resistor in-line with the circuit.
- Finally, connect a wire from the negative terminal of the power supply to GND.
How does the ina219 bus voltage monitor work?
The device monitors both shunt voltage drop and bus supply voltage, with programmable conversion times and filtering. A programmable calibration value, combined with an internal multiplier, enables direct readouts of current in amperes. An additional multiplying register calculates power in watts.
What is the ina219 shunt and power monitor?
The INA219 is a current shunt and power monitor with an I2C- or SMBUS-compatible interface. The device monitors both shunt voltage drop and bus supply voltage, with programmable conversion times and filtering. A programmable calibration value, combined with an internal multiplier, enables direct readouts of current in amperes.
How is the voltage measured in the ina219 chip?
The negative analogue input is used to measure the load voltage and hence, with the current measurement, the power dissipated in the load. INA219 Specification The total voltage between +Ain and -Ain must not exceed 0.3~26V. The device comes in two accuracy standards A, B with B more accurate.
How is current measured in the ina219 I2C interface?
The I2C interface features 16 programmable addresses.” The INA219 calculates the current flowing through the “Current Shunt” sense resistor by first measuring the voltage across the resistor, and then applying Ohm’s law, Bus voltage is measured directly on the load side of the shunt resistor ( VIN − ).