MICROCHIP PAC1941T-1E/4MX

The PAC194X products are one, two, three and four-channel energy monitors, with bus voltage monitors and current sense amplifiers that feed high-resolution ADCs. There are two versions of the PAC194X: the PAC194X-1 devices are for high-side current sensing and the PAC194X-2 devices are for low-side current sensing or floating VBUS applications. Digital circuitry performs power calculations and energy accumulation. This enables energy monitoring with integration periods up to one year or longer. Bus voltage, sense resistor voltage and accumulated proportional power are stored in registers for retrieval by the system host or embedded controller. The PAC194X devices have a set of digital comparators that allow the user to detect over/undervoltage, over/undercurrent and overpower against user programmed limits for each channel and generate an ALERT when the threshold is exceeded. The sampling rate and energy integration period can be controlled over SMBus or I²C. Active channel selection, single-shot measurements and other controls are also configurable by the SMBus or I²C. The PAC194X device family uses real-time calibration to minimize the offset error. No input filters are required for this device.

• High-Side/Low-Side Current Monitor with One, Two, Three or Four Channels:
  • -100 mV Full-Scale Range (FSR) for current sense voltage
  • 16-bit resolution for current measurement
  • Programmable FSR: -50 mV to +50 mV
  • External sense resistor sets the full-scale current range
  • Very low input current simplifies routing
• Voltage Monitor with Wide VBUS Range
  • 0V to 9V FSR
  • 4.5V programmable VBUS option
  • 16-bit resolution for voltage measurements
• VSOURCE Can Be Applied before VDD Is Applied
• Real-Time Auto-Calibration of Offset Error for Voltage and Current
• 1% Power Measurement Accuracy over a Wide Dynamic Range
• On-Chip Accumulation of 30-bit Power Results for Energy Measurement
  • User programmable sampling rates of 8, 64, 256 and 1024 SPS
  • 5120 SPS for a single channel in Burst mode
• 2.7V to 5.5V Supply Operation
  • 1.62 - 5.5V capable I2C/SMBus and digital I/O
  • SMBus 3.1 and I²C Fast Mode Plus, 1 Mbps
  • High-Speed mode (3.4 Mbps)
• SMBus Address – 16 Options, Set with Resistor
• ALERT Features that Can Be Enabled:
  • ALERT on conversion complete
  • ALERT on Over/Undervoltage and Current or Overpower conditions
• Coulomb Counting: When Selected, the Accumulator Accumulates VSENSE Values.
• 8X Averaging Mode for Single-Shot Measurements to Reduce Noise and Offset
• Two Independent ALERT/GPIO pins
• AEC-Q100 Qualified (VQFN)
• Available Packages:
  • 3×3 mm 16-Lead VQFN with wettable flanks
  • 2.225×2.17 mm 16-Lead WLCSP

• Embedded Computing
• Networking
• FPGA Systems
• Low-Voltage/High-Power – AI, GPU
• Industrial
• Linux Applications
• Notebook and Tablet Computing
• Cloud, Linux and Server Computing
• Optical Networking Modules
• Automotive