SBOS776C March 2016 – March 2021 INA3221-Q1
PRODUCTION DATA
The INA3221-Q1 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 9-1 illustrates a typical INA3221-Q1 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.