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INA3221-Q1 Datasheet(PDF) 35 Page - Texas Instruments

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Part # INA3221-Q1
Description  Current and Voltage Monitor with Programmable Overcurrent Alerts
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

INA3221-Q1 Datasheet(HTML) 35 Page - Texas Instruments

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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
35
INA3221-Q1
www.ti.com
SBOS776B – MARCH 2016 – REVISED MARCH 2016
Product Folder Links: INA3221-Q1
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Copyright © 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-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 52 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.
Figure 52. INA3221-Q1 as an Overcurrent Sensor


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