-48V Telecom Current/Voltage/Power Sense with Isolation


Design files


This verified design can accurately measure current, voltage and power on a bus that carries -48V and is able to provide this data using an I²C compatible interface. This design is targeted for Telecom applications because the most common Telecom equipment’s are fed with this negative supply voltage. It uses INA226 and ISO1541. The INA226 is a current shunt and power monitor with an I²C compatible interface. This device will precisely take these measurements and will use ISO1541 to translate the negative voltage to ground referenced signals. The ISO1541 is a low-power, bidirectional I²C compatible isolator.

  • Ability to report current, voltage and power on a bus that carries -48V
  • High Accuracy:

- 10µV Offset (Max)

- 0.1% Gain Error (Max)        

  • I²C compatible interface
  • Isolation friendly for board to board communication
  • I²C compatible isolation translates -48V reference to ground referenced signals


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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU361A.PDF (975 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRAO0.ZIP (1053 K)

Files used for 3D models or 2D drawings of IC components

TIDC638.ZIP (833 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

Digital power monitors

INA22636V, 16-bit, ultra-precise i2c output current/voltage/power monitor w/alert

Data sheet: PDF | HTML
I2C isolators

ISO15412.5-kVrms, isolated unidirectional clock, bidirectional I2C isolator

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
Design guide –48-V Telecom Current, Voltage, and Power Sense With Isolation Reference Design (Rev. A) Sep. 28, 2017

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