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The are many ways to measure current and Texas Instruments has a diverse portfolio to do exactly that!
Here are a few links to get you started measuring current with TI products:
If you don't know where to start with your current measurement design, start with this short Introduction to Current Shunt Monitors
If you want to learn all about current shunt monitors implementation and error analysis, watch the Getting Started with Current Shunt Monitors video series
If you know the device specifications you need, head straight over to the Parametric Search for Current Shunt Monitors
If you want to learn more about current shunt monitors, the series A Current Sensing Tutorial on EE|Times (written by TIers) is a great resource. Here are links to part 1, part 2, part 3, and part 4.
TI Application Note SLVA704 is an excellent reference for I2C questions.
There are TI Designs to help you with your implementation:
TIDA-00313 - -48V Telecom Current/Voltage/Power Sense with Isolation
TIDA-00328 - 50 mA-20 A, Single-Supply, Low-Side or High-Side Current Sensing Solution
TIDA-00302 - Transient Robustness for Current Shunt Monitor
TIDA-00614 - 30A Range Bidirectional Current Shunt Monitor Ref Design
In general, Current Shunt Monitors are used to measure mA to A with good accuracy. There are some other devices that are often better suited to measuring low currents, often using a true instrumentation amplifier, an operational amplifier, or a programmable gain amplifier. If you are interested in low current measurement, we encourage you to look into these TI Designs for a start:
TIPD135 - 10uA-100mA, 0.05% Error, High-Side Current Sensing Solution Reference Design
TIPD156 - Low-Drift Bidirectional Single-Supply Low-Side Current Sensing Reference Design
TIPD104 - Current Sensing Solution, 10uA-10mA, Low-side, Single Supply
TIPD129 - 0-1A, Single-Supply, Low-Side, Current Sensing Solution
If you need to measure current with a Common Mode voltage of more than 80V, there are a few options. Please look into:
Extending Voltage Range of Current Shunt Monitor application note (which uses the INA168).
TIDA-00332 - High Voltage 12 V – 400 V DC Current Sense Reference Design
INA149 (High Common Mode Voltage Difference Amplifier).
AMC1100 and AMC1200 (4.25kV peak Isolated Amplifier for Current Shunt Measurements).
TIDA-00528 - 40 V to 400 V Uni-directional Current/Voltage/Power Monitoring Reference Design.
If you are interested in over-current detection, please look into:
INA300 and INA301 products
This video: Introduction to Optimized Over-Current with the INA300
This document: TI Over-Current Detection Products
If you are looking for High-Voltage, High-Current, non-invasive, isolated, fluxgate and magnetic current monitoring, please look into:
DRV425 and DRV421 products
TIPD205 - ±100A Bus Bar Current Sensor using Open-Loop Fluxgate Sensors Reference Design
TIDA-00463 - Fluxgate Based Displacement Sensor Reference Design
TIPD196 - ±15A Current Sensor using Closed-Loop Compensated Fluxgate Sensor Reference Design
General FAQ #1
Question: How do I protect against reverse current when I can only allow my signal 0.3V below ground?
Answer: One possible solution is to use a MOSFET, see this thread.
Thank you for using TI products!
Jason Bridgmon, TI Sensing Products Applications Support
Current Shunt Monitor Video Training Series
Hall Effect Sensor Video Training Series
TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs.
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