MCP39F511A datasheet(52/68 Pages) MICROCHIP

Part #	MCP39F511A

Description	AC/DC Dual-Mode Power-Monitoring IC with Calculation and Energy Accumulation

PDF	68 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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52 / 68 page

MCP39F511A

DS20006044A-page 52

 2018 Microchip Technology Inc.

The PCB traces and the inductors resistance cause a

voltage drop when high currents are flowing through

them.

The higher the current is, the higher the error of the

voltage RMS measurement.

This voltage drop can be compensated using the

VoltageDropComp register (enabled in DC and AC

mode).

EQUATION 9-12:

EXAMPLE 9-2:



----------

Where:

x = Uncompensated voltage RMS

y = Compensated voltage RMS

c = Compensation value found in

VoltageDropComp register

I = Measured current RMS

M = VOLTAGEDROP

value

found

RANGEVDROPINCAPCOMP register

A 0.1

 resistor at 10A [rms] corresponds to an offset

voltage of 1V [rms].

–

 2



-----------------------------

Where:

y -x = offset value

M = 28 (default value)

c = 10 * 268435456 / 100000

c = 26843, this is the value that should be written to

the VoltageDropComp register

MCP39F511A Datasheet(PDF) 52 Page - Microchip Technology