High-side current/power sensor has A & D outputs

June 10, 2015 // By Graham Prophet
Microchip says its sensor is the first to feature both a configurable analogue output and a 2-wire digital bus; the PAC1921 maximises data and diagnostic reporting while minimising data latency, outputting power, current or voltage over a single pin and over the 2-wire digital bus.

A combined analogue and digital current sensor, the PAC1921 can present power, current or voltage over the single output pin. Simultaneously, all power-related output values are also available over the 2-wire digital bus, which is compatible with I²C. The PAC1921’s analogue output is adjustable for 3V, 2V, 1.5V or 1V microcontroller inputs; it has an integrated 39-bit accumulation register and 128 times gain configuration. The device supports high-speed power management of light and heavy loads from 0V to 32V and comes in a 10-lead 3 x 3 mm VDFN package. It was designed with the 2-wire bus to maximise data and diagnostic reporting, while having the analogue output to minimise data latency.

The PAC1921 is suitable for networking, power-distribution, power-supply, computing and industrial-automation applications that cannot allow for latency when performing high-speed power management. 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. This pin can also be used to synchronise readings of multiple devices.

The PAC1921 is supported by Microchip’s new PAC1921 High-Side Power and Current Monitor Evaluation Board (ADM00592), which is priced at $64.99.

Microchip; www.microchip.com/PAC1921-042915a