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I2C module for measuring 0-50A current and 0-50V voltage with high accuracy and reliability.


This is an open-source hardware design, one of the modules from the MLAB labolatory system.


VCAI2C02A VCAI2C02A bottom


The VCAI2C02A is an I2C module designed for measuring current (0-50A) and voltage (0-50V) using a measuring transformer. It integrates multiple components to provide accurate and reliable measurements for various applications.


  • Current Measurement: 0 to 50A
  • Voltage Measurement: 0 to 50V
  • Interface: I2C
  • Measurement Transformer: Included
  • Connectors: XT30PW-M and XT30PW-F
  • High Stability Isolated Error Amplifier: ADuM3190
  • High-Resolution ADC: MCP3423


XT30PW Connectors

  • Item No: XT30PW-M and XT30PW-F
  • Contact Resistance: 0.80mΩ
  • Rated Voltage: DC 500V
  • Rated Current: 15A
  • Instantaneous Current: 30A
  • Material: Brass Gold Plated
  • Insulation Material: PA, UL94 V0
  • Operating Temperature: -20℃ to 120℃

ADuM3190 Isolated Error Amplifier

  • Stability in isolated feedback applications
  • Initial Accuracy: 0.5%
  • Accuracy over Temperature Range: 1%
  • Reference Voltage: 1.225V
  • Bandwidth: 400 kHz
  • Isolation Voltage: 2.5 kV rms
  • Temperature Range: -40°C to +125°C


  • Resolution: 18-bit
  • Interface: I2C
  • Programmable Data Rate
  • Internal Voltage Reference: 2.048V

Hall Effect Current Sensor (Tamura L01ZXXXS05 Series)

  • Type: Open Loop
  • Mounting: PCB
  • Nominal Current: Up to 600A
  • Accuracy: Excellent accuracy and linearity
  • Temperature Drift: Low
  • Frequency Bandwidth: Wide
  • No Insertion Loss


  • Linear Power Supplies
  • Inverters
  • Uninterruptible Power Supply (UPS)
  • DOSA-compatible Modules
  • Voltage Monitors
  • Automotive and drone Systems

Additional Resources

For more detailed information, please refer to the datasheets of the components used in the VCAI2C02A module: