Teridian 73S1215F, User Manual

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UG_1215F_039 73S1215F Evaluation Board User Guide
Rev. 1.8 7
2 Evaluation Board Basic Setup
Figure 2 shows the basic connections of the evaluation board with the external equipment.
The power supply can come from three sources:
•
A regulated lab power supply connected to the banana plugs J2, J3 and J5. In this case, the board
main switch S1 has no effect.
•
Any AC-DC converter block (default), able to generate a DC power supply of 7 V min / 12 V max /
400 mA. In this case, the board main switch S1 connects or disconnects the supply to the board.
•
The +5 V from the USB bus when connected to a computer or hub able to support USB-powered
devices. In this case, the board main switch S1 has no effect. When the board is powered from the
USB bus, the application is bus-powered and the embedded application must be designed for this.
The USB VBUS specification allows the VBUS voltage to be as low as 4.4 V. This will violate
the minimum VPC voltage for smart card operation which is specified as 4.75 V. As a result,
this power configuration is not recommended.
The communication with an external host can be accommodated by either:
•
A standard USB 2.0 Full Speed Interface or
•
A standard RS-232 serial interface (TX/RX only).
Figure 2: 73S1215F Evaluation Board Basic Connections
The board provides by default the USB CCID application. Refer to
Section 3 for information on setting up
and running the USB CCID application.
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