Power Consumption Meter with a MSP430 (MIC007E)

In its Application Report SLAA517 dated May 2012, Texas Instruments describes the implementation of a Watt-Time meter for a phase using the MSP430F6736 microcontroller.

The document can be accessed in full at http://www.ti.com/lit/an/slaa517/slaa517.pdf


In the document, the MSP430F6736 microcontroller, which consists of a measurement system on-chip (SoC), belonging to the MSP430F67xxx family is used. The same device can also be used in two- or three-phase systems.

The microcontroller features a 25 MHz CPU, and incorporates up to 3 sigma-delta 24-bit analog-to-digital converters.

The sigma-delta inputs operate independently providing a 24-bit resolution output and can be grouped together to obtain simultaneous voltage and current samplings from the same release.

In Figure 1 we have the meter diagram that can be used with voltages of 230 V, 120 V in 50 Hz or 60 Hz.


Figure 1 - Meter diagram
Figure 1 - Meter diagram



In the Texas Instruments documentation, the reader will find the details of each stage of the circuit with the values ??of the components.

In Figure 2 we have a suggestion of direct power to the circuit.



Figure 2 - Power to the meter, directly from the power grid
Figure 2 - Power to the meter, directly from the power grid



The program for implementing the meter can also be found in the same documentation.





Circuit Bench