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INA3221AIRGVT Datasheet(PDF) 14 Page - Texas Instruments

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Part # INA3221AIRGVT
Description  Triple-Channel, High-Side Measurement, Shunt and Bus Voltage Monitor
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

INA3221AIRGVT Datasheet(HTML) 14 Page - Texas Instruments

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−120
−80
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Conversion Time: 140µS
Conversion Time: 332µS
Conversion Time: 1.1mS
G023
INA3221
SBOS576 – MAY 2012
www.ti.com
The conversion times selected can also have an impact on measurement accuracy. This effect can seen in
Figure 23. Multiple conversion times shown in Figure 23 illustrate the impact of noise on the measurement.
These curves were taken without averaging used. In order to achieve the highest accuracy measurement
possible, a combination of the longest allowable conversion times and highest number of averages should be
used, based on system timing requirements.
Figure 23. Noise versus Conversion Time
ALERT MONITORING
Because the INA3221 allows programmable thresholds that ensure the intended application operates within the
desired operating conditions, multiple monitoring functions are available via four Alert pins: Critical Alert, Warning
Alert, Power Valid Alert, and Timing Control Alert. These Alert pins are open-drain connections.
Critical Alert
The Critical Alert monitors functions based on individual conversions of each shunt voltage channel. The Critical
Alert Limit feature compares the shunt voltage conversion for each channel to the corresponding value
programmed into the corresponding limit register to determine if the measured value exceeds the intended limit.
Exceeding the programmed limit indicates that the current through the shunt resistor is too high. The default
Critical Alert Limit value for each channel is set to a positive full-scale value to effectively disable this alert at
power-up. The corresponding limit registers can be programmed at any time to begin monitoring for out-of-range
conditions. The Critical Alert pin is asserted and pulled low if any channel measurements exceed the limit present
in the corresponding channel Critical Alert Limit. When the Critical Alert pin is asserted, the Mask/Enable
Register can be read to determine which channel caused the Critical Flag Bit to assert.
The INA3221 also allows the Critical Alert pin to be controlled by the Summation Control function. The
Summation Control function compares the sum of the single conversions of the desired channels based on the
Summation Channel Control bits set in the Mask/Enable Register to determine if the combined sum has
exceeded the programmed limit. In order for this summation limit to have a meaningful value, all included
channels must use the same shunt resistor value. The individual conversion values cannot be added directly
together in the Shunt Voltage Sum register to report the total current unless equal shunt resistor values are used
for each channel. The Summation Channel Control bits either disable the Summation Control function or allow
the Summation Control function to switch between including two or three channels in the Shunt Voltage Sum
register. The Shunt Voltage Sum Limit register contains the programmed value used to compare the Shunt
Voltage Sum register to determine if the total summed limit has been exceeded. If the Shunt Voltage Sum Limit
value is exceeded, the Critical Alert pin is asserted low. Either the Summation Flag bit or the individual Critical
Alert Limit bits in the Mask/Enable Register can determine the source of the alert when the Critical Alert pin
asserts.
14
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Product Folder Link(s): INA3221


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