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High-Side Current/Power Sensor Features Configurable Analog Output and 2-Wire Digital Bus
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A combined analog and digital current sensor is a high-side current sensor with both a digital output, as well as a configurable analog output that 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 from Microchip Technology is available in a 10-lead 3x3 mm VDFN package and 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 suitable 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 useful 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. 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. Pricing starts at $1.18 each in 5,000-unit quantities. The PAC1921 is supported by Microchip’s new PAC1921 High-Side Power and Current Monitor Evaluation Board,which is available for $64.99.