TH6503 Datasheet, PDF (9/24 Pages) List of Unclassifed Manufacturers – USB Low-Speed Interface

TH6503 USB Low-Speed Interface
Application
Wiring Diagram
Figure 14 shows a sample Application circuitry with the TH6503 and a MC68HC05.
To stabilize the internal power supply the V3.3 pin must always be connected with an 10µ capaci-
tor.
Figure 14. Sample Wiring diagram to connect the TH6503 with an MC68HC05
WAKE Function
RESET Output
The USB specification defines that a device has to The reset output (/ORST) of the TH6503 can be
go into suspend mode if no bus traffic was de- connected with the reset input of the
tected for ca. 3 ms. After the device is set to microcontroller. It’s a low active signal.
suspend mode, the WAKE pin can be used to _{This signal has a minimum length of 31 clock}
Wake up the device with an external event.
cycles with a default frequency of 1.5 MHz (see Pin
If the WAKE pin is connected with an RC-Element, Description for details).
the TH6503 wakes up after the time defined by the
RC-Element. This feature can be used to check for
data in periodical time frames.
After this reset pulse the microcontroller can
reseted but it must wait to programming the
TH6503 until the USB reset is inactive.
All register of TH6503 will be held in reset state,
exept the StatusRegister, until the corresponding
bits HWR or RES is cleared.
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