INA740 digital power monitor (DIN version)

The INA740 is a digital power monitor with an integrated current sensing element along with a 16-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure full-scale currents up to ±24 A (connector limit, the chip limit is ±35 A) with common-mode voltage support to +85 V.

The INA740 reports current, bus voltage, die temperature, power, energy. The integrated temperature sensor is ±2.5°C accurate over the junction temperature range.

Communication with the sensor is via the I2C bus. The RJ plug of the sensor is compatible with tinycontrol devices, and the sensor is supported by the LK4 controller. For integration with another controller (e.g. Arduino), you should familiarize yourself with the RJ plug pinout, which is described e.g. in the LK4 short manual.

The sensor board is equipped with a 4-position switch that allows you to change the I2C address and thanks to which it is possible to operate 4 sensors on one I2C bus (the functionality is available with LK4).

Start-up

The sensor should be connected according to the diagram, for voltage measurement (and of course power and energy) the LK4 ground and the load ground must be common! In the case of an isolated system, only current measurement can be realized.

Technical specifications