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INA3221 Datasheet(PDF) 36 Page - Texas Instruments |
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INA3221 Datasheet(HTML) 36 Page - Texas Instruments |
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36 / 46 page  Power Supply (0 V to 26 V) Load 1 Load 2 Power Supply (0 V to 26 V) Load 3 Power Supply (0 V to 26 V) CBYPASS 0.1 µF VS (Supply Voltage) CH 1 CH 2 VIN±1 VIN+1 VIN±2 VIN+2 CH 3 VIN±3 VIN+3 I 2C- and SMBus- Compatible Interface SDA SCL A0 Critical Warning GND ADC Shunt Voltages 1-3 Critical Limit Alerts 1-3 Bus Voltages 1-3 Power Valid (PV) Timing Control (TC) Shunt Voltage Sum Alerts VS VPU 10 k VPU 10 k 36 INA3221 SBOS576B – MAY 2012 – REVISED MARCH 2016 www.ti.com Product Folder Links: INA3221 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information INA3221 is a three-channel current and bus voltage monitor with I2C/SMBUS-compatible interface. It features programmable conversion times and averaging modes and offers both critical and warning alerts to detect multiple programmable out-of-range conditions for each channel. 9.2 Typical Application The INA3221 measures the voltage developed across a current-sensing resistor when current passes through it. The device also measures the bus supply voltage at the IN- pin. Multiple monitoring functions are supported using four alert pins: Critical, Warning, PV, and TC. Programmable thresholds make sure operation is within desired operating conditions. This design illustrates the ability of the Critical alert pin to respond to a set threshold. Figure 52 illustrates a typical INA3221 application circuit using all three channels. For best performance, use a 0.1- μF ceramic capacitor for power-supply bypassing, placed as close as possible to the supply and ground pins. The digital pins (SCL, SDA, Critical, Warning, TC) are connected to supply through pull-up resistors. The power valid (PV) alert pin is connected to the VPU pin through a pull-up resistor to enable power-valid monitoring. Figure 52. INA3221 as an Overcurrent Sensor |
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