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INA3221AIRGVT Datasheet(PDF) 18 Page - Texas Instruments

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Part # INA3221AIRGVT
Description  Triple-Channel, High-Side Measurement, Shunt and Bus Voltage Monitor
Download  36 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

INA3221AIRGVT Datasheet(HTML) 18 Page - Texas Instruments

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INA3221
SBOS576 – MAY 2012
www.ti.com
Overload conditions are another consideration for the INA3221 inputs. The INA3221 inputs are specified to
tolerate 26 V across the inputs. A large differential scenario might be a short to ground on the load side of the
shunt. This type of event can result in full power-supply voltage across the shunt (as long as the power supply or
energy storage capacitors can support it). Keep in mind that removing a short to ground can result in inductive
kickbacks that can exceed the 26-V differential and common-mode rating of the INA3221. Inductive kickback
voltages are best controlled by zener-type transient-absorbing devices (commonly called transzorbs) combined
with sufficient energy storage capacitance.
In applications that do not have large energy storage electrolytics on one or both sides of the shunt, an input
overstress condition may result from an excessive dV/dt of the voltage applied to the input. A hard physical short
is the most likely cause of this event, particularly in applications without large electrolytics present. This problem
occurs because an excessive dV/dt can activate the INA3221 ESD protection in systems where large currents
are available. Testing has demonstrated that the addition of 10-
Ω resistors in series with each INA3221 input
sufficiently protects the inputs against this dV/dt failure up to the 26-V device rating. Selecting these resistors in
the range noted has minimal effect on accuracy.
DEFAULT INA3221 SETTINGS
The default register power-up states are listed in the Register Details section. These registers are volatile, and if
programmed to a value other than the default values shown in Table 1, they must be reprogrammed every time
the device powers up.
Software Reset
The INA3321 features a software reset that can reinitialize the device and register settings to the default power-
up values without having to cycle power to the device. Bit 15 (RESET) of the Configuration Register can be used
to perform this software reset. Setting this bit reinitializes all registers and settings to the default power state with
the exception of the Power Valid output state.
If a software reset is issued, the INA3221 holds the output of the Power Valid pin until the Power Valid detection
sequence completes. The Power Valid Upper and Lower limit registers default to the default state when the
software reset has been issued so any reprogrammed limit registers are reset, thus resulting in the original
Power Valid thresholds validating the Power Valid conditions. This architecture ensures that circuitry connected
to the Power Valid output is not interrupted during a software reset event.
18
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Copyright © 2012, Texas Instruments Incorporated
Product Folder Link(s): INA3221


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