TSC2012IDT datasheet(27/50 Pages) STMICROELECTRONICS

27 / 50 page

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Bidirectional operation

Bidirectional mode of operation allows the device to measure currents through a shunt resistor in two directions.

The output reference can be set anywhere within the power supply range. If the output common mode voltage is

set at mid-range, the full scale current measurement range is equal in both directions. This is achieved by

connecting one Vref pin to Vcc and the other Vref pin to Gnd as described by Figure 60. Split supply. It can be

done as well connecting both Vref pins to Vcc / 2 voltage as described by Figure 61. External supply. In case the

current measurement is not equal in both directions, user can set the output in a non-symmetrical configuration,

adjusting Vref according to the user's needs.

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Split supply

Figure 60. Split supply

The great advantage of this configuration, is that the TSC2011 can be used in bidirectional mode with an output

common mode voltage set at the middle of scale, with an accuracy of 0.1%, without any added external

component or power supply. This configuration creates a midscale offset ratiometric to the power supply.

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External

Figure 61. External supply

In this configuration, Vref1 pin and Vref2 pin are connected together to a reference voltage. The output common

mode voltage is then automatically set to this reference voltage value when no current flows through the Rshunt

resistance. This configuration adjusts the output offset as needed by the application. A DAC for calibration of the

analog chain could also be used.

TSC2010, TSC2011, TSC2012

Application information

DS13057 - Rev 7

page 27/50

TSC2012IDT 데이터시트(PDF) 27 Page - STMicroelectronics