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TI debuts digital current sensor, voltage monitor

Posted: 11 Oct 2013     Print Version  Bookmark and Share

Keywords:digital current sensor  voltage monitor  ADC channel  SPI interface 

Texas Instruments (TI) has rolled out what it says is the industry's first digital current sensor and voltage monitor with simultaneous sampling and SPI interface. The LMP92064 integrates a precision current sense amplifier and two 12bit ADC channels that simultaneously capture voltage and current data, while the SPI interface transfers real-time data at up to 20MHz. The device is used in applications where precise power monitoring is crucial such as communications infrastructure applications including telecom, servers and central office equipment, stated the firm.

The combination of simultaneous sampling, maximum input offset voltage of ±15uV, and maximum gain error of less than ±0.75 per cent delivers unparalleled accuracy compared to the competition. The 125ksps conversion rate is 19 times faster than the competition, which allows designers to measure power fluctuations more accurately, stated the firm. Designers can communicate with the device using a four-wire SPI interface at speeds up to 20MHz, which is six times faster than the nearest competitor's I2C interface, continued TI. The unidirectional input and output lines enable easy interfacing to isolation devices, such as the ISO7141CC quad-channel digital isolator.

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

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