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INA3221-Q1 Datasheet(PDF) 17 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) 17 Page - Texas Instruments

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Conversion Time: 140 µs
Conversion Time: 332 µs
Conversion Time: 1.1 ms
Number of Conversions
Product Folder Links: INA3221-Q1
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Copyright © 2016, Texas Instruments Incorporated
Device Functional Modes (continued) Averaging and Conversion-Time Considerations
The INA3221-Q1 has programmable conversion times for both the shunt- and bus-voltage measurements. The
selectable conversion times for these measurements range from 140
μs to 8.244 ms. The conversion-time
settings, along with the programmable-averaging mode, enable the INA3221-Q1 to optimize available timing
requirements in a given application. For example, if a system requires data to be read every 2 ms with all three
channels monitored, configure the INA3221-Q1 with the conversion times for the shunt- and bus-voltage
measurements set to 332
The INA3221-Q1 can also be configured with a different conversion-time setting for the shunt- and bus-voltage
measurements. This approach is common in applications where the bus voltage tends to be relatively stable, and
allows for the time focused on the bus voltage measurement to be reduced relative to the shunt-voltage
measurement. For example, the shunt-voltage conversion time can be set to 4.156 ms with the bus-voltage
conversion time set to 588
μs for a 5-ms update time.
There are trade-offs associated with the conversion-time and averaging-mode settings. The averaging feature
significantly improves the measurement accuracy by effectively filtering the signal. This approach allows the
INA3221-Q1 to reduce the amount of noise in the measurement caused by noise coupling into the signal. A
greater number of averages allows the INA3221-Q1 to be more effective in reducing the measurement noise
component. The trade-off to this noise reduction is that the averaged value has a longer response time to input-
signal changes. This aspect of the averaging feature is mitigated to some extent with the critical-alert feature that
compares each single conversion to determine if a measured signal (with noise component) has exceeded the
maximum acceptable level.
The selected conversion times also have an impact on measurement accuracy. This effect can seen in
Figure 25. The multiple conversion times shown in Figure 25 illustrate the impact of noise on measurement.
These curves shown do not use averaging. In order to achieve the highest-accuracy measurement possible, use
a combination of the longest allowable conversion times and highest number of averages, based on system
timing requirements.
Figure 25. Noise Versus Conversion Time

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