{"product_id":"adafruit-ina237-85v-10a-16-bit-dc-current-voltage-power-monitor-stemma-qt","title":"Adafruit INA237 85V 10A 16-bit DC Current Voltage Power Monitor - STEMMA QT","description":"\u003cp\u003eAn I2C breakout for high or low side power monitoring, with a 16-bit ADC for precise measurements.\u003c\/p\u003e\n\u003cp\u003eThe INA237 is an amazing power monitoring chip, with best-of-everything support: up to 85VDC common-mode, high or low side measurements, 16-bit ADC for precision measurements from milliamp to Amp, and I2C interface for easy configuration of alerts, oversampling, gain adjustments and more!\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe INA237 is similar to the INA228, with the same:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eup to +85V high or low-side measurements\u003c\/li\u003e\n\u003cli\u003eup to 10A or 2.75A\u003c\/li\u003e\n\u003cli\u003ecurrent, voltage and power measurements\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eHowever, unlike the INA228 the INA237:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ehas only 16-bit resolution, so 0.15mA or 42uA LSB rather than 10uA\/2.5uA\u003c\/li\u003e\n\u003cli\u003ethe INA228 can measure energy\/charge for you but the INA237 cannot\u003c\/li\u003e\n\u003cli\u003e0.3% gain error, ±50 µV max offset voltage compared to INA228's 0.05% gain error, ±1 µV\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis breakout board may well be the last current sensing solution you every need to buy. Not only can it do the work of two multimeters, but it can do it with amazing precision and flexibility. With it you can measure high or low side DC current, the bus voltage, and have it automatically calculate the power. It can do so over impressive voltage, current, and temperature ranges with better than 1% accuracy, all while delivering the data in an easy to use format over I2C.\u003c\/p\u003e\n\u003cp\u003eWorks great with any microcontroller that is CircuitPython or Arduino compatible as well as single board computers such as the Raspberry Pi. It is compatible with 3V or 5V logic and can measure bus voltages up to +85VDC. Not for use with AC voltages.\u003c\/p\u003e\n\u003cp\u003eMost current-measuring devices operate with some notable constraints that limit what they can be used for. Many are low-side only which can cause issues as the ground reference changes with current. Others like its little sister the INA219B avoid this by measuring on the high side but need to change their shunt resistor to measure different current ranges. The INA237 avoids these limitations, and with the precision 15milliohm shunt resistor on board, it can be used to measure as much as \u003cstrong\u003e+85V\u003c\/strong\u003e at up to \u003cstrong\u003e10A \u003c\/strong\u003e(~0.15mA per LSB) or\u003cstrong\u003e 2.75A \u003c\/strong\u003e(~42uA per LSB) \u003cstrong\u003eContinuous\u003c\/strong\u003e on either the \u003cem\u003ehigh or low side\u003c\/em\u003e. Wow!\u003c\/p\u003e\n\u003cp\u003eThe voltage across the integrated \u003cem\u003e15 milliohm (.015 ohms!)\u003c\/em\u003e, 0.1% shunt resistor is measured by the internal 16 bit ADC, allowing for measurements over the current range with a resolution of 0.15mA per LSB in high current measurement mode or 42uA per LSB in low current measurement mode .To measure low-side, Connect\u003cstrong\u003e VIN-\u003c\/strong\u003e to ground and \u003cstrong\u003eVIN+\u003c\/strong\u003e to your load's lowest potential. Cut the jumper on the back that connects VBUS to VIN+: \u003cstrong\u003eVBUS \u003c\/strong\u003eshould connect to the highest project voltage, up to 85V. To measure high-side, connect \u003cstrong\u003eVIN+\u003c\/strong\u003e\u003cstrong\u003e \u003c\/strong\u003eto the highest project voltage, and \u003cstrong\u003eVIN- \u003c\/strong\u003eto the load's highest potential. In high-side measurement, which is most common, we simplify wiring by having a pre-connected jumper from \u003cstrong\u003eV+\u003c\/strong\u003e to \u003cstrong\u003eVBUS\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eUsage is simple. Power the sensor itself with 3 to 5VDC and connect the two I2C pins to your microcontroller. Then connect your target power supply to VIN+ and the load to ground to VIN-. We have a detailed tutorial that will do all the gain, range, and math for you - just plug and go with\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/github.com\/adafruit\/Adafruit_INA237_INA238\"\u003eour Arduino library\u003cspan\u003e \u003c\/span\u003e\u003c\/a\u003eor CircuitPython! You can connect up to 4 sensors on one bus by soldering the address jumpers on the back.\u003c\/p\u003e\n\u003cp\u003eAs if that weren't enough, we also added\u003ca href=\"https:\/\/www.sparkfun.com\/qwiic\"\u003e SparkFun qwiic\u003c\/a\u003e-compatible \u003cstrong\u003e\u003ca href=\"https:\/\/learn.adafruit.com\/introducing-adafruit-stemma-qt\"\u003eSTEMMA QT\u003c\/a\u003e\u003c\/strong\u003e connectors for the I2C bus,\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eso you don't even need to solder the I2C and power lines.\u003c\/strong\u003e Simply wire up to your favorite micro using a \u003ca href=\"\/en-us\/products\/jst-sh-cable-qwiic-stemma-qt-compatible\" target=\"_blank\" rel=\"noopener\"\u003eSTEMMA QT adapter cable.\u003c\/a\u003e The Stemma QT connectors also mean the INA237 can be used with our \u003ca href=\"\/en-us\/collections\/qw-st\" target=\"_blank\" rel=\"noopener\"\u003evarious associated accessories.\u003c\/a\u003e \u003ca href=\"\/en-us\/products\/jst-sh-cable-qwiic-stemma-qt-compatible\" target=\"_blank\" rel=\"noopener\"\u003eQT Cable is not included, but we have a variety in the shop\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eComes as a fully assembled breakout board with a 3.5mm terminal block and header. Some light soldering is required to attach the header for use in a breadboard. \u003c\/p\u003e\n\u003ch2\u003eTechnical Details\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-resolution, 16-bit delta-sigma ADC\u003c\/li\u003e\n\u003cli\u003eCurrent monitoring accuracy:\u003cbr\u003eOffset voltage: ±50 µV (maximum)\u003cbr\u003eOffset drift: ±0.02 µV\/°C (maximum)\u003cbr\u003eGain error: ±0.3% (maximum)\u003cbr\u003eGain error drift: ±50 ppm\/°C (maximum)\u003cbr\u003eCommon mode rejection: 120 dB (minimum)\u003c\/li\u003e\n\u003cli\u003ePower monitoring accuracy:\u003cbr\u003e– 1.6% full scale, –40°C to +125°C (maximum)\u003c\/li\u003e\n\u003cli\u003eFast alert response: 75 μs\u003c\/li\u003e\n\u003cli\u003eWide common-mode range: –0.3 V to +85 V\u003c\/li\u003e\n\u003cli\u003eBus voltage sense input: 0 V to 85 V\u003c\/li\u003e\n\u003cli\u003eShunt full-scale differential range: ±163.84 mV \/ ±40.96 mV\u003c\/li\u003e\n\u003cli\u003eInput bias current: 2.5 nA (maximum)\u003c\/li\u003e\n\u003cli\u003eTemperature sensor: ±1°C (maximum at 25°C)\u003c\/li\u003e\n\u003cli\u003eProgrammable conversion time and averaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eProduct Dimensions: 25.3mm x 20.3mm x 10.7mm \/ 1.0\" x 0.8\" x 0.4\"\u003c\/p\u003e\n\u003cp\u003eProduct Weight: 3.4g \/ 0.1oz\u003c\/p\u003e\n\u003cimg src=\"https:\/\/www.adafruit.com\/includes\/templates\/shop2019\/images\/RoHS2_2011_65_EU.svg\" alt=\"RoHS 2 2011 65 EU Compliant\" width=\"145\" height=\"80\"\u003e\n\u003cimg src=\"https:\/\/www.adafruit.com\/includes\/templates\/shop2019\/images\/RoHS2_2015_863_EU.svg\" alt=\"RoHS 2 2015 863 EU Compliant\" width=\"145\" height=\"80\"\u003e\n\u003ch2\u003eLearn\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/learn.adafruit.com\/adafruit-ina237-dc-current-voltage-power-monitor\"\u003ePrimary Guide: Adafruit INA23x DC Current Voltage Power Monitor\u003c\/a\u003e\u003cbr\u003eHigh or Low Side Power Monitoring Over I2C\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/learn.adafruit.com\/products\/6340\/guides\" target=\"_blank\" rel=\"noopener\"\u003eSee All Guides\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":57079728669045,"sku":"ADA6340","price":7.75,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0389\/1025\/files\/6340-02.jpg?v=1776439389","url":"https:\/\/wholesale.pimoroni.com\/en-us\/products\/adafruit-ina237-85v-10a-16-bit-dc-current-voltage-power-monitor-stemma-qt","provider":"Pimoroni Wholesale","version":"1.0","type":"link"}