The output of the INAx191 goes to a high-impedance state when disabled; therefore, it is possible to connect

multiple outputs of the INAx191 together to a single ADC or measurement device, as shown in Figure 7-7. When

connected in this way, enable only one INAx191 at a time, and make sure both devices have the same supply

voltage. Using the INA2191 with the same approach as shown in Figure 7-7 provides the capability to monitor

two currents with a single device.

ADC

RSENSE

LOAD

Microcontroller

RSENSE

LOAD

0.1 F

Supply Voltage

1.7 V to 5.5 V

GPIO1

GPIO2

ENABLE

VS

OUT

GND

0.1 F

Supply Voltage

1.7 V to 5.5 V

TI Device

Bus Voltage1

up to 40 V

Bus Voltage2

up to 40 V

IN+

IN±

ENABLE

VS

OUT

GND

TI Device

IN+

IN±

Figure 7-7. Multiplexing Multiple Devices With the ENABLE Pin

www.ti.com

INA191, INA2191

SLYS020C – FEBRUARY 2019 – REVISED AUGUST 2021

Copyright © 2023 Texas Instruments Incorporated

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Product Folder Links: INA191 INA2191