TSC2012H datasheet(27/49 Pages) STMICROELECTRONICS

27 / 49 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 3. It can also be done by

connecting both VREF pins to Vcc / 2 voltage as described by Figure 4. In case the current measurement is not

equal in both directions, the 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 biggest advantage of this configuration is that the TSC2011H 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.

TSC2010H, TSC2011H, TSC2012H

Application information

DS13791 - Rev 2

page 27/49

TSC2012H Arkusz danych(PDF) 27 Page - STMicroelectronics