Part Number: INA226AIDGSR

Manufacturer: Texas Instruments


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Technical Specifications of INA226AIDGSR

Datasheet  INA226AIDGSR datasheet
Category Integrated Circuits (ICs)
Family PMIC – Current Regulation/Management
Manufacturer Texas Instruments
Packaging Tape & Reel (TR)
Part Status Active
Function Current Monitor
Sensing Method High/Low-Side
Accuracy ±0.02%
Voltage – Input 0 V ~ 36 V
Current – Output 10mA
Operating Temperature -40°C ~ 125°C
Mounting Type Surface Mount
Package / Case 10-TFSOP, 10-MSOP (0.118″, 3.00mm Width)
Supplier Device Package 10-VSSOP

INA226AIDGSR Description

With an I2CTM or SMBUS-compliant interface, the INA226 is a current shunt and power monitor. Shunt voltage drop and bus supply voltage are both monitored by the gadget. Direct readouts of current in amps and power in watts are possible thanks to programmable calibration value, conversion timings, averaging, and an internal multiplier.

Independent of the supply voltage, the INA226 measures current on common-mode bus voltages that range from 0 V to 36 V. The gadget requires a single source that ranges in voltage from 2.7 to 5.5 volts to function, typically requiring 330 A. The device has an operational temperature range of -40°C to 125°C and an I2C-compatible interface with up to 16 programmable addresses.

INA226AIDGSR Features

  • Detects bus voltages between 0 and 36 volts.
  • Sensing on the high or low sides.
  • Reports the power, voltage, and current.

High Accuracy

  • Gain Error of 1% (Max).
  • V Offset 10 (Max).

INA226 vs. INA260

The maximum CMRR for the INA260 is 150uA/V. This may be expressed in terms of voltage by multiplying 150uA/V by 2 mOhms, which results in 300nV/V. 20*log(1V/300nV) equals a minimum of 130dB. A 126dB CMRR is the bare minimum for the INA226. The two devices have the same offset (10uV), offset drift (100nV/degC), and ADC shunt voltage LSB (2.5uV). It is clear from those above that the two components are identical.

Detailed Description

An I 2C and SMBus-compliant interface are available on the digital current sense amplifier known as the INA226. It offers the digital current, voltage, and power measurements required for precision decision-making in tightly controlled systems.

Programmable registers enable versatile setup for both continuous versus triggered operation and measurement resolution.

Feature Description

Basic ADC Functions

Two measurements are made on the relevant power-supply bus by the INA226 device. The load current passing through a shunt resistor generates a shunt voltage, measured at the IN+ and IN- pins. By connecting the power supply bus voltage to the VBUS pin, the device can also measure that voltage.

While measuring the differential shunt voltage with the IN-pin, the bus voltage is measured with the ground. Usually, a separate source that can produce between 2.7 V and 5.5 V powers the gadget. The voltage on the bus under observation may be between 0 and 36 volts. A full-scale register produces a value of 40.96 V based on the fixed 1.25-mV LSB for the Bus Voltage Register.

Power Calculation

After readings of the bus voltage and shunt voltage, the current and power are calculated.  Following a shunt voltage measurement, a current is computed using the value stored in the calibration register. The current value recorded is 0 if there is no value entered into the Calibration Register. Based on the preceding current calculation and bus voltage measurement, power is determined after the bus voltage measurement.

The power value stored is 0 if no value is entered in the calibration register. Once more, these computations are carried out in the background and do not prolong the conversion process. Unless the averaging is set to 1, these current and power values are regarded as intermediate results and are kept in an internal accumulation register rather than the relevant output registers. Once all samples have been measured and averaged depending on the averages specified in the Configuration Register, the newly calculated values for current and power are added to this accumulation register (00h).

Device Functional Modes

Conversion time considerations and averaging For both the bus voltage and shunt voltage measurements, the INA226 device enables customizable conversion times (tCT). There are options for conversion periods for these measures, ranging from 140 s to 8.244 ms. The conversion time settings and programmable averaging mode enable the device to be set up to best meet the timing requirements in a particular application. For instance, the device may be designed to set the conversion times at 588 s for shunt and bus voltage measurements, and the averaging mode is set to 4. This would be the case if a system required data to be read every 5 ms.

With this arrangement, the data updates roughly every 4.7 milliseconds. For the measurements of the bus and shunt voltages, the device might optionally be configured with a different conversion time setting. This strategy is prevalent when the bus voltage tends to be very stable. Due to this circumstance, measuring the bus voltage may take less time than measuring the shunt voltage. With the bus voltage conversion time set to 588 s and the averaging mode set to 1, the shunt voltage conversion time could be set to 4.156 ms.

Additionally, this setting causes data to update every 4.7 milliseconds or so. The options for conversion time and the chosen averaging mechanism include trade-offs. The averaging feature can considerably increase measurement accuracy by successfully filtering the signal. This method enables the device to lower any measurement noise brought on by noise coupling into the signal. The gadget is more efficient in lowering the noise component of the measurement when there are more averages.

INA226AIDGSR Manufacturer

Texas Instruments Incorporated (TI), an American technology corporation with headquarters in Dallas, Texas, creates and markets a variety of integrated circuits and semiconductors sold to producers and designers of electronic devices worldwide. According to sales volume, it is one of the top 10 semiconductor businesses in the world. The company concentrates on creating embedded CPUs and analog circuits, which provide more than 80% of its sales. Calculators, microcontrollers, and multi-core processors are among the educational technology products that TI also makes using its digital light processing technology. As of 2016, the business had 45,000 patents in use across the world.


The device’s input circuitry can accurately measure signals on common-mode voltages higher than its VVS power supply voltage. For instance, the voltage provided to the VVS power supply terminal may be 5 V, yet the common-mode voltage of the load power supply that is being monitored may be as high as 36 V.

Furthermore, remember that the device can withstand the entire 0-V to the 36-V range at the input terminals, whether or not power is applied. To maintain stability, place the necessary power-supply bypass capacitors as close as possible to the supply and ground terminals of the apparatus. The supply bypass capacitor’s typical value is 0.1 F. Additional decoupling capacitors may be needed for applications with noisy or high-impedance power supplies to reject power-supply noise.

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