Welcome, @NVall.2, to the community!
The EVALSTPM3X-3PH, a poly-phase evaluation board, was a Class 0.2, single-phase or poly-phase
meter with current transformer sensors.
I regret to inform you that the board has already been discontinued, so no more information is available from STMicroelectronics. Furthermore, it was based on an STM8S903K3, which was already set to NRND (Not Recommended for New Designs).
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Good luck!
/Peter
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