Microchip Technology has introduced the PAC1761 and PAC1861 families of digital power monitors for 48 V power architectures. Besides reading instantaneous voltage and current, the devices accumulate power measurements over time, which Microchip says lets a system react to its energy use as it happens. The company lists automotive, AI/data center, server, networking, industrial, telecom/Power over Ethernet (PoE) and 48 V power distribution among the applications.
Both families measure bus voltages up to 65 V and carry 75 V of spike protection. Microchip says the headroom is there to ensure transient survivability. The PAC1761 is the 12-bit option and the PAC1861 the 16-bit option.
Each part is a single-channel, bidirectional monitor for high-side or low-side sensing. An external sense resistor sets the full-scale current, and the sense range is 100 mV full scale, configurable to 50 mV. Microchip cites 1% power measurement accuracy over a wide dynamic range, on-chip accumulation of 32-bit power results for energy measurement and a coulomb-counting mode in which the accumulator sums sense-voltage values. Coulomb counting is a common basis for estimating a battery’s state of charge. The digital interface supports SMBus 3.1 and I2C Fast Mode Plus at 1 Mbps, plus a 3.4 Mbps High Speed Mode.
Programmable alerts flag voltage, current and power excursions. Step-limit detection identifies sudden load changes, and configurable accumulated-energy thresholds let a system act on long-term power behavior as well as instantaneous readings.
The monitors come in VDFN-8, VDFN-10 and MSOP-10 packages, including automotive-orderable variants. Microchip says pin-compatible options let designers move between devices as requirements, availability, cost or performance change, and can shorten qualification cycles.
Development support includes the EV12R33A evaluation board, priced at $49, plus a Python command line interface (CLI) with library, a Linux driver and a generic C library with code examples for multiple microcontrollers.
Both families are available from Microchip and its distributors. Pricing starts at $0.56 each in 10,000-unit quantities for the PAC1761T-3E/E3 and PAC1861T-1E/3P, both in the MSOP-10 package.
“The industry conversation is shifting from measuring power at a single point in time to understanding and responding to energy behavior across an entire system and its lifecycle,” said Keith Pazul, Vice President of Microchip’s Mixed-Signal Linear Business Unit. “The PAC1761 and PAC1861 families are designed to help customers build better performing and more reliable 48V systems that can measure instantaneous conditions and understand energy consumption and availability over time.”
Source: Microchip Technology
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