Teridian 73S1215F, Руководство пользователя

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73S1215F Evaluation Board User Guide UG_1215F_039
32 Rev. 1.8
4.6.3 LCD
The 73S1215F does not contain an on-chip LCD controller. However, an LCD module (with built-in
controller) can be used with the 73S1215F via use of specific USR (GPIO) pins. The LCD API libraries
support up to a 2 line/16 character display.
Figure 17 shows the basic connection for this type of LCD. The
LCD module must connect to the USR pins as shown and it requires an external brightness adjust circuit.
Figure 17: LCD Connections
4.6.4 USB Interface
The USB interface on the 73S1215F requires few external components for proper operation. Two serial
resistors of 24
Ω
± 1% are needed to provide proper impedance matching for the USB data signals D+
and D-.
For self-powered USB applications, a connection must be made between the VBUS power input and
USR7 for proper operation with the provided API libraries. A direct connection can not be made as the
VBUS voltage exceeds the digital power supply running at 3.3 V. As a result, a resistor divider is required
to scale the VBUS voltage down to 3.3 V.
Figure 18 shows the basic USB connections.
Figure 18: USB Connections
73S1215F
73S1215F
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