Simultaneously, all power related output values are also available over the 2-Wire digital bus, which is compatible with I2C. The PAC1921, available in a 10-lead 3x3 mm VDFN package, was designed with the 2-Wire bus to maximize data and diagnostic reporting, while having the analog output to minimize data latency. The analog output can also be adjusted for use with 3V, 2V, 1.5V or 1V microcontroller inputs.

The PAC1921 is ideal for networking, power-distribution, power-supply, computing and industrial-automation applications that cannot allow for latency when performing high-speed power management. A 39-bit accumulation register and 128 times gain configuration make this device ideal for both heavy and light system-load power measurement, from 0V to 32V.

It has the ability to integrate more than two seconds of power-consumption data. Additionally, the PAC1921 has a READ/INT pin for host control of the measurement period; and this pin can be used to synchronize readings of multiple devices.

“The ability to output power measurements in both the digital and analog domains provides designers with a unique level of flexibility,” said Bryan J. Liddiard, marketing vice president of Microchip’s Analog and Interface Products Division. “The PAC1921 accomplishes this by combining a digital current sensor to maximize data and diagnostic reporting, together with an analog current sensor to minimize data latency.”