MCP39F511A datasheet(3/68 Pages) MICROCHIP

3 / 68 page

 2018 Microchip Technology Inc.

DS20006044A-page 3

MCP39F511A

MCP39F511A Typical Application – Single Phase, Two-Wire Application Schematic

DGND

OSCO

OSCI

DVDD RESET

AVDD

I1+

I1-

V1-

V1+

REFIN/OUT+

AGND

COMMONA,B

LOAD

+3.3V

MCP1754

+3.3V

AGND

DGND

33 nF



499 k



4MH

22 pF

33 nF

0.01 µF

0.47 µF 470

470 µF



1µF

0.1 µF

AN_IN



Leave Floating

N.C.

MCP9700A

(OPTIONAL)

+3.3V

to MCU UART

UART_RX

UART_TX

(OPTIONAL)

Connect on PCB

EVENT1

ZCD

EVENT2

PWM

MCP39F511A

499 k



Note 1:

The MCP39F511A demonstration board uses a switching power supply, however a low-cost

capacitive-based supply, as shown here, is sufficient for many applications.

The external sensing components shown here, a 2 m

 shunt, two 499 k and 1 k resistors for the

1000:1 voltage divider, are specifically chosen to match the default values for the calibration registers

defined in Section 6.0 “Register Descriptions”. By choosing low-tolerance components of these

values (for instance 1% tolerance), measurement accuracy in the 2-3% range can be achieved with

zero calibration (AC only, offset calibration may be needed in DC mode). See Section 9.0

“MCP39F511A Calibration”

for more information.

+3.3V

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