USB connection-detection circuitry and operation methods of the same
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United States of America Patent
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Issued Date -
Nov 14, 2002
app pub date -
Aug 30, 2001
filing date -
May 8, 2001
priority date (Note) -
Abandoned
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Abstract
A USB connection-detection circuitry and the operation method of the same are disclosed. The circuitry includes a transmitting circuit and a detecting circuit. The transmitting circuit contains a pair of differential signal lines, a pair of pull-down resistors and a pair of pull-up resistors wherein one pull-down resistor and one pull-up resistor are connected to the same differential signal line with their own individual switches. A power-related signal supplied by a power-supply system is received by the transmitting circuitry and transmitted through a differential signal line. Then, the power-related signal is grounded via a pull-down resistor. The detecting circuit is utilized to detect the power-related signals, which flow through the differential lines. When a device is connected to this connection-detection circuitry with a USB cable, the differential signal lines of the USB cable are connected with the differential signal lines of this circuitry. This results in the variation of the power-related signals, which are connected to the ground through the pull-down resistors originally. Therefore, by comparing the difference of the power-related signals before and after the connection, the connection-detection circuitry is able to automatically identify the mode of the device, which connects to the circuitry.
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- 15 United States
- 10 France
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Patent Owner(s)
Patent Owner | Address | |
---|---|---|
PROLIFIC TECHNOLOGY INC | 7F NO 48 SEC 3 NAN KANG RD NAN KANG TAIPEI 115 |
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Wu, Wen-Jen | Taip, TW | 11 | 134 |
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Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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