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INA190 数据表(PDF) 9 Page - Texas Instruments

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部件名 INA190
功能描述  Low Supply, Voltage Output, Low- or High-Side Measurement, Bidirectional, Zero-Drift Series, Current-Shunt Monitors
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

INA190 数据表(HTML) 9 Page - Texas Instruments

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ADC
RSENSE
LOAD
Microcontroller
Bus Voltage1
±0.1 V to +40 V
ENABLE
VS
OUT
REF
GND
IN+
IN±
RSENSE
LOAD
0.1 F
Supply Voltage
1.7 V to 5.5 V
Bus Voltage2
±0.1 V to +40 V
GPIO1
GPIO2
ENABLE
VS
OUT
REF
GND
IN+
IN±
0.1 F
Supply Voltage
1.7 V to 5.5 V
INA190
INA190
Copyright © 2017, Texas Instruments Incorporated
9
INA190
www.ti.com
SBOS863 – MARCH 2018
Product Folder Links: INA190
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
7.4 Device Functional Modes
7.4.1 Normal Operation
The INA190 is in normal operation when the following conditions are met:
The power-supply voltage (VVS) is between 1.7 V and 5.5 V.
The common-mode voltage (VCM) is within the specified range of –0.1 V to +40 V.
The maximum differential input signal times the gain plus VREF is less than VVS minus the output voltage
swing to VVS.
The minimum differential input signal times the gain plus VREF is greater than the swing to GND (see the Rail-
to-Rail Output Swing section).
During normal operation, this device produces an output voltage that is the gained-up representation of the
difference voltage from IN+ to IN– plus the reference voltage at VREF.
7.4.2 Shutdown
The INA190 features an active high ENABLE pin that when pulled to a logic low signal shuts down the device.
When shut down, the quiescent current is reduced to 10 nA (typ), and the output goes to a high-impedance state.
The low quiescent current extends the battery lifetime when the current measurement is not needed. When the
ENABLE pin is driven to a logic-high level, the device turns back on. The typical output setting time when
enabled is 130 µs.
The output of the INA190 goes to a high-impedance state when disabled; therefore, it is possible to connect
multiple outputs of the INA190 together to a single ADC or measurement device, as shown in Figure 2.
Figure 2. Multiplexing Multiple Devices With the ENABLE Pin
When connected in this way, enable only one INA190 at a time and both devices must have the same supply
voltage.


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