Sub-µA Current Sensor

RD-UAMP-SENSOR

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The Sub-µA Current Sensor is a Kinetis K22F-based current measurement board running on FreeRTOS, for use with the Freedom Development Ecosystem or any other Arduino-like development boards.

This Reference Design allows for nonintrusive interfacing between any MCU and 3.3V shield, and measurement of a large range of low currents (~60 nA – 5 mA). Multiple communication methods are available, including integration with Freedom Sensor Toolbox (CE).

Block Diagram

RD-UAMP-SENSOR Block Diagram

Sub-µA Current Sensor Block Diagram
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Supported Devices

Processors and Microcontrollers

K2x / KS2x USB

  • K22_120: Kinetis® K22-120 MHz, Cost Effective, Full-Speed USB Microcontrollers (MCUs) based on Arm® Cortex®-M4 Core

Power Management

Battery Chargers

  • MC34673: 1.2 A Single-Cell Li-Ion / Li-Polymer Battery Charger

Features

Nonintrusive

  • Plugs in-between any existing 3.3V MCU + shield solution without requiring any firmware changes

Compatible

  • Uses the widely popular Arduino connector layout and pinout

Bidirectional

  • Ability to measure both MCU and shield currents separately

High precision

  • Auto-switching shunt resistor bank for optimal range selection, accurate current-sense amplifier and 16-bit sampling depth

High speed

  • Optimized processing pipeline enables acquisition @ 88 kSa/s

LCD module

  • Embeds capacitive touch buttons and an LCD module to provide quick and easy access to a control menu

I²C sensor emulation

  • Can be accessed through a standard I²C interface and virtual register map

Bluetooth module header

  • Embeds a header for connecting an off-the-shelf UART-to-Bluetooth module

USB connector

  • Enables the creation of highly optimized communication channels using the USB stack, or through a virtual serial port

Buy Options

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  • RD-UAMP-SENSOR
    Active

  • Sub-µA Current Sensor.

  • Kit contains:

    • Seamless integration in existing solutions
    • Accurate measurement from 60 nA to 5 mA
    • Onboard LCD module and capacitive buttons for quick access
    • Embeds several communication channels
    • Freedom Sensor Toolbox (CE) support
  • $136.62 USD
  • For a quantity of 1
    • Availability: Pending Stock
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Note: For better experience, software downloads are recommended on desktop.

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