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PAC1942T-2E/4MX

MCHPPAC1942T-2E/4MX

Microchip Technology
Current/Voltage Monitor Regulator Low-Side 16-VQFN (3x3)
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Overview

The PAC1942T-2E/4MX is a high-accuracy, dual-channel power and energy monitor with an integrated bus voltage and current sense amplifier. It features 16-bit resolution for both voltage and current measurements, alongside an on-chip accumulator for 30-bit power results and energy calculation. AEC-Q100 qualification and real-time auto-calibration make it suitable for precision monitoring in automotive and industrial power systems.

Why Choose This Part

This device offers exceptional flexibility with programmable sampling rates up to 1024 SPS and a burst mode reaching 5120 SPS for single-channel transients. Its high-side/low-side sensing capability and 0V to 9V VBUS range provide versatility, while the 1% accuracy and AEC-Q100 qualification ensure reliability in demanding environments. Integrated ALERT pins allow for autonomous monitoring of overvoltage, undervoltage, and overpower conditions.

Applications

Automotive Power Distribution
Monitoring rail health and current consumption in vehicle electronic control units (ECUs) and infotainment systems.
Battery Management Systems
Utilizing 16-bit resolution and coulomb counting features to track state-of-charge and battery health in low-voltage packs.
Industrial Equipment Monitoring
High-side or low-side sensing for real-time power monitoring and overcurrent protection in factory automation hardware.
Energy Auditing
Leveraging the on-chip power accumulator to measure energy consumption over time without taxing the host MCU.

Key Specifications

Accuracy +/-1%
Function Current/Voltage Monitor
Mounting Type Surface Mount, Wettable Flank
Package / Case 16-VFQFN Exposed Pad
Sensing Method Low-Side
Voltage - Input 2.7V ~ 5.5V
Operating Temperature -40degC ~ 125degC (TA)
Supplier Device Package 16-VQFN (3x3)

Getting Started

Engineers can evaluate the device using the PAC1944/PAC1942 Evaluation Board (ADM00940) which connects via USB for rapid prototyping. Communication is handled over a standard I2C/SMBus interface, and software support is available via Microchip's PowerView utility and C-based drivers. For initial hardware integration, ensure the 16-VQFN package is mounted according to wettable flank soldering guidelines for automotive-grade inspection.

Also Consider

INA226 TITexas Instruments - Offers higher bus voltage monitoring up to 36V for systems exceeding the 9V limit of the PAC1942.
INA233 TITexas Instruments - Provides a PMBus compatible interface for standard telecommunications and server power management infrastructures.

Categories

Power Management > Power Monitoring ICs