The MAX471 module (HCSENS0041) is a complete, bidirectional, highside current-sense amplifier for portable PCs, telephones, and other systems where battery/DC power-line monitoring is critical. High-side power-line monitoring is especially useful in battery-powered systems, since it does not interfere with the ground paths of the battery chargers or monitors often found in “smart” batteries. You can also use it with like Arduino boards and use it in power imaging projects.The MAX471 has an internal 35mΩ current-sense resistor and measures battery currents up to ±3A. The module has a built-in 2K Ohm sens resitor giving the module a full sensor range of +/- 3A. An open-collector SIGN output indicates current-flow direction, so the user can monitor whether a battery is being charged or discharged. Operation is from 3V to 36V, and draws less than 100µA over temperature. 

The module is also disassembled with 2-pin terminal and 6-pin header(soldering is required).

Technical specifications:

• Input Voltage: 3-36V
  
• Maximum Current Measurement: +/- 3A
  
• Dimensions: 20mm x 19.5mm
  
  

Pinout:

Sensor:

• RS +: Input Voltage (3-36V)
  
• RS-: Part of the load to be measured

Interface:

• RS +: An optional input voltage pin to the RS + pin in the sensor section
  
• GND: Common ground output (For both load, input voltage and other output devices)
  
• OUT: Sensor current output (1V / Ampere, 3V maximum)
  
• SIGN: Current flow direction
  
• GND: Alternative GND
  
• RS-: Alternative RS-pin

Technical Documents:

• Datasheet
• Arduino example project