Digital current sensor & voltage monitor with SPI

10th October 2013

Nat Bowers

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Datasheet

Texas Instruments have today announced the release of the industry’s first digital current sensor and voltage monitor with simultaneous sampling and SPI interface. Integrating a precision current sense amplifier and two 12-bit analog-to-digital converter channels that simultaneously capture voltage and current data, the LMP92064 features an SPI interface which transfers real-time data at up to 20 MHz.

This enables the device to provide the highest precision power calculations of any device on the market today.The LMP92064 is used in applications where precise power monitoring is crucial, such as communications infrastructure applications, including telecom, servers and central office equipment.

Key features and benefits of the LMP92064:

Industry-leading accuracy: The combination of simultaneous sampling, maximum input offset voltage of +/-15 uV, and maximum gain error of less than +/-0.75 percent delivers unparalleled accuracy compared to the competition.
Fastest conversion rate: The125-ksps conversion rate is 19 times faster than the competition, which allows designers to measure power fluctuations more accurately.
Higher bandwidth: Designers can communicate with the device using a four-wire SPI interface at speeds up to 20 MHz, which is six times faster than the nearest competitor’s I2C interface.
Easy isolation barrier interface: The unidirectional input and output lines enable easy interfacing to isolation devices, such as the ISO7141CCquad-channel digital isolator.

Tools and support

The LMP92064 evaluation module quickly demonstrates the functionality of the current shunt monitor. The EVM includes a USB interface and software to configure and monitor the performance of the device.
A SPICE model is also available for designing, testing, and troubleshooting a broad variety of basic and advanced circuits, including complex architectures, without any node or number of device limitations.
The LMP92064 joins TI’s portfolio of current sense amplifiers for high-side or low-side applications, supporting common mode voltages as high as +80V and as low as -22V.
Support is available on the Current Shunt Monitors forum in the TI E2E Community, where engineers can ask questions and get answers from TI experts.

Packaging, availability and pricing

The LMP92064 is available now in a 16-pin, 5-mm x 4-mm WSON package for a suggested retail price of US$1.99 in 1,000-unit quantities.