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INA231 Datasheet(PDF) 10 Page - Texas Instruments |
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INA231 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 44 page  ADC ´ ´ Shunt Voltage Channel Bus Voltage Channel Shunt Voltage (1) Data Registers Calibration (2) Current (1) Bus Voltage (1) Power (1) 10 INA231 SBOS644A – FEBRUARY 2013 – REVISED JUNE 2017 www.ti.com Product Folder Links: INA231 Submit Documentation Feedback Copyright © 2013–2017, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The INA231 is a digital, current-sense amplifier with an I2C- and SMBus-compatible interface. It provides digital current, voltage, and power readings necessary for accurate decision-making in precisely controlled systems. Programmable registers allow flexible configuration for measurement resolution, as well as continuous-versus- triggered operation. Detailed register information is shown in the Register Maps section. See the Functional Block Diagram section for a block diagram of the INA231 device. 8.2 Functional Block Diagram (1) Read-only (2) Read/write Figure 20. Functional Block Diagram 8.3 Feature Description 8.3.1 Basic Analog-to-Digital Converter (ADC) Functions The INA231 performs two measurements on the power-supply bus of interest. The voltage developed from the load current that flows through a shunt resistor creates the shunt voltage signal that is measured at the IN+ and IN– pins. The device can also measure the power supply bus voltage by connecting this voltage to the BUS pin. The differential shunt voltage is measured with respect to the IN– pin whereas the bus voltage is measured with respect to ground. The INA231 is typically powered by a separate supply that can range from 2.7 V to 5.5 V. The bus that is being monitored can range in voltage from 0 V to 28 V. NOTE Based on the fixed 1.25 mV LSB for the bus voltage register, a full-scale register would result in a 40.96-V value. However, the actual voltage that is applied to the input pins of the INA231 should not exceed 28 V. There are no special considerations for power-supply sequencing because the common-mode input range and power-supply voltage are independent of each other; therefore, the bus voltage can be present with the supply voltage off, and vice-versa. As noted, the INA231 takes two measurements, shunt voltage and bus voltage. It then converts these measurements to current, based on the Calibration register value, and then calculates power. See the Configure, Measure, and Calculate Example section for additional information on programming the calibration register. |
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