PAC1931/2/3/4
Single/Multi-Channel DC Power/Energy Monitor
with Accumulator
Features
Applications
• High-Side Current Monitor with One, Two, Three
or Four Channels
• Embedded Computing
• Networking
- 100 mV full-scale range for current sense
voltage,16-bit resolution
• FPGA Systems
• Automotive
- Selectable bidirectional current sense
capability, -100 mV to +100 mV range, 16-bit
two’s complement (signed) data format
• Low Voltage/High Power – AI, GPU
• Industrial
®
• Linux Applications
- External sense resistor sets full scale current
range
• Notebook and Tablet Computing
• Cloud, Linux and Server Computing
• Optical Networking Modules
- Very low input current simplifies routing
• Wide Bus Voltage Range for Voltage Monitor
- 0V to 32V input common-mode voltage
Computing Platform Support
• Windows® 10 Driver
• Linux Driver
- 16-bit resolution for voltage measurements;
14 bits are used for power calculations
• Real Time Auto-Calibration of Offset and Gain
Errors for Voltage and Current, No User
Adjustment Required
• Python™ Script
• 1% Power Measurement Accuracy over a Wide
Dynamic Range
Description
The PAC1931/2/3/4 are one, two, three and
four-channel power and energy monitoring devices. A
high-voltage multiplexer sequentially connects the
inputs to a bus voltage monitor and current sense
amplifier that feed high-resolution ADCs. Digital
circuitry performs power calculations and energy
accumulation.
• On-Chip Accumulation of 28-bit Power Results for
Energy Measurement
- 48-bit power accumulator register for
recording accumulated power data
- 24-bit Accumulator Count
-
User programmable sampling rates of 8, 64,
256 and 1024 samples per second
This enables energy monitoring with integration
periods from 1 ms up to 36 hours or longer. Bus
voltage, sense resistor voltage and accumulated
proportional power are stored in registers for retrieval
by the system master or Embedded Controller.
- 17 minutes of power data accumulation
minimum at 1024 S/s
-
Over 36 hours of power data accumulation
minimum at 8 S/s
• 2.7V to 5.5V Supply Operation
The sampling rate and energy integration period can be
controlled over SMBus or I2C. Active channel selection,
one-shot measurements and other controls are also
configurable by SMBus or I2C.
- Separate VDD I/O pin for digital I/O
- 1.62-5.5V capable SMBus and digital I/O
-
SMBus 3.0 and I2C Fast Mode Plus (1 Mb/S)
• SMBus Address – 16 Options, set with Resistor
• No Input Filters Required
The PAC1931/2/3/4 device family uses real time
calibration to minimize offset and gain errors. No input
filters are required for this device.
• ALERT Features that can be Enabled:
- ALERT on accumulator overflow
- ALERT on Conversion Complete
• 4 × 4 × 0.5 mm UQFN Package
• 2.225 × 2.17 mm WLCSP Package
2017-2019 Microchip Technology Inc.
DS20005850E-page 1