MCP39F501 Power Monitoring IC

The MCP39F501 is a highly integrated, single-phase power-monitoring Integrated Circuit (IC) designed for real-time measurement of input power for Alternate Current (AC)/Direct Current (DC) power supplies, power distribution units, and industrial applications. It includes dual-channel delta-sigma Analog-to-Digital Converters (ADCs), a 16-bit calculation engine, EEPROM, and a flexible two-wire interface. An integrated low-drift voltage reference addition to 94.5 dB of SINAD performance on each measurement channel allows for better than 0.1% accurate designs across a 4000:1 dynamic range.

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MCP39F501 Features

  • Power monitoring accuracy capable of 0.1% error across 4000:1 dynamic range.
  • Fast calibration routines.
  • Programmable event notifications such as over-current and voltage sag surge protection.
  • 512 bytes user-accessible EEPROM through page read/write commands.
  • Non-volatile on-chip memory, no external memory required.
  • Built-in calculations on fast 16-bit processing core.
    • Active, reactive, and apparent power.
    • True Root-Mean-Square (RMS) current and RMS voltage.
    • Line frequency and power factor.
  • Two-wire serial protocol using a two-wire Universal Asynchronous Receiver Transmitter (UART) interface supporting multiple devices on a single bus.
  • Low-drift internal voltage reference, 10 ppm/°C typical.
  • 28-lead 5 x 5 QFN package.
  • Extended temperature range -40 °C to +125 °C.

MCP39F501 Target Applications

  • Real-time measurement of Input Power for AC/DC supplies.
  • Intelligent power distribution units.

MCP39F501 Block Diagram


MCP39F501 Pin Descriptions

MCP39F501 5x5 QFN Symbol Function
1 MODE/DIR Single or Multiple Device mode with direction control for RS-485 drivers
2 NC No Connect (must be left floating)
3 NC No Connect (must be left floating)
4 UART_RX UART Communication RX Pin
5 COMMONA Common pin A, to be connected to COMMONB
6 OSCI Oscillator Crystal Connection Pin or External Clock Input Pin
7 OSCO Oscillator Crystal Connection Pin
8 NC No Connect (must be left floating)
9 NC No Connect (must be left floating)
10 MCLR Reset Pin for Delta Sigma ADCs
11 AVDD Analog Power Supply Pin
12 UART_TX UART Communication TX Pin
13 COMMONB Common pin B, to be connected to COMMONA
14 A0/DIO0 Address Select Pin 0 / Configurable digital I/O 0
15 A1/DIO1 Address Select Pin 1 / Configurable digital I/O 1
16 I1+ Non-Inverting Current Channel Input for 24-bit ∆∑ ADC
17 I1- Inverting Current Channel Input for 24-bit ∆∑ ADC
18 V1- Inverting Voltage Channel Input for 24-bit ∆∑ ADC
19 V1+ Non-Inverting Voltage Channel Input for 24-bit ∆∑ ADC
20 AN_IN/DIO2 Analog Input for SAR ADC / Configurable Digital Input/Output 2 Pin
21 AGND Analog Ground Pin, Return Path for internal analog circuitry
22 DIO3 Configurable Digital Input/Output 3
23 REFIN+/OUT Non-Inverting Voltage Reference Input and Internal Reference Output Pin
24 DGND Digital Ground Pin, Return Path for internal digital circuitry
25 DVDD Power Supply Pin
26 MCLR Master Clear for Device
27 DGND Digital Ground Pin, Return Path for internal digital circuitry
28 DR Data Ready (must be left floating)
29 EP Exposed Thermal Pad (to be connected to DGND)

MCP39F501 Application Example - Single Phase, Two-Wire Application

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