About UsMicrochip Releases New High-Side Current and Power Sensor
The PAC1921 Features Both a Configurable Analog Output and a 2-Wire Digital Bus
Microchip has just released a combined analog and digital current sensor-the PAC1921. This new device is the world's first 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, 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.
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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.”
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Features of the PAC1921 High-Side Current and Power Sensor
- Configurable Measurement Type Output: Power, Current or Bus Voltage
- Configurable Voltage Output (3V, 2V, 1.5V, 1V)
- All output values also available over SMBus
- New Device Topology
- Provides integrated average power measurement
- Power measurements provided to micro-controller with ADC inputs
- Output voltage proportional to selected measurement
- High-Side Current Sensor
- 100 mV full-scale current sense voltage range
- Second-order delta-sigma ADC with 11-bit or 14-bit resolution
- Selectable current binary gain ranges: 1x through 128x
- 1% Power Measurement Accuracy
- Auto-Zero Offset
- Auto Sleep State
- VDD = 3.3V nominal (operational range 3.0V to 5.5V)
- Bus Range 0V to 32V
- No Input Filters Required
More information on the PAC1921 High-Side Current and Power Sensor can be found on the Microchip website at Microchip PAC1921 product page.
Note: The Microchip name and the Microchip logo are registered trademarks of Microchip Technology Incorporated in the U.S.A and other countries. All other trademarks mentioned herein are the property of their respective companies.
The Microchip website address is www.microchip.com
[Reprinted with kind permission from Microchip Corporation - Release Date, 9th June, 2015]