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INA3221AIRGVT Datasheet(PDF) 38 Page - Texas Instruments |
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INA3221AIRGVT Datasheet(HTML) 38 Page - Texas Instruments |
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38 / 46 page  IN 3 IN+3 GND VS IN+1 IN 1 PV Critical I 2C- and SMBUS- Compatible Interface Via to Ground Plane Via to Power Plane Connect to bus power- supply rail Connect to VPU Supply Bypass Capacitor Warning Output To Bus Power Supply To Load To Bus Power Supply To Load Critical Output Timing Control Output 38 INA3221 SBOS576B – MAY 2012 – REVISED MARCH 2016 www.ti.com Product Folder Links: INA3221 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated 10 Power Supply Recommendations The input circuitry of the device can accurately measure signals on common-mode voltages beyond its power supply voltage, VS. For example, the voltage applied to the VS power supply terminal can be 5 V, whereas the load power-supply voltage being monitored (the common-mode voltage) on any one of the three channels can be as high as 26 V. Note also that the device can withstand the full 0-V to 26-V range at the input terminals, regardless of whether the device has power applied or not. Place the required power-supply bypass capacitors as close as possible to the supply and ground terminals of the device to ensure stability. A typical value for this supply bypass capacitor is 0.1 μF. Applications with noisy or high-impedance power supplies may require additional decoupling capacitors to reject power-supply noise. 11 Layout 11.1 Layout Guidelines Connect the input pins (IN+ and IN–) of all the used channels to the sensing resistor using a Kelvin connection or a 4-wire connection. These connection techniques ensure that only the current-sensing resistor impedance is detected between the input pins. Poor routing of the current-sensing resistor commonly results in additional resistance present between the input pins. Given the very low ohmic value of the current-sensing resistor, any additional high-current carrying impedance causes significant measurement errors. Place the power-supply bypass capacitor as close as possible to the supply and ground pins. 11.2 Layout Example Figure 55. Layout Example |
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