TSC2012 datasheet(29/54 Pages) STMICROELECTRONICS

29 / 54 page

In this configuration Vref1 pin and Vref2 pin are connected together to the Vcc power supply. The output common

mode voltage is then automatically set to Vcc voltage when no current flows through the Rshunt resistance. This

configuration allows the full scale output in unidirectional mode. It measures the current as described in

Figure 59. Output reference to Vcc.

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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.

•

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.

TSC2010, TSC2011, TSC2012

Unidirectionnal / bidirectionnal operation

DS13057 - Rev 4

page 29/54

TSC2012 Folha de dados(PDF) 29 Page - STMicroelectronics