Data transceiver using LVDS and a portable terminal employing the same and method therefor

• US 20060212624A1
• Filed: 03/09/2006
• Published: 09/21/2006
• Est. Priority Date: 03/21/2005
• Status: Abandoned Application

• Current Assignee: Pantech Corporation (Ideahub, Inc.)
• Original Assignee: Pantech Corporation (Ideahub, Inc.)
• Inventors: Kim, Dong-Hwan
• Application Number:
  US11/372,494
• Publication Number:
  US 20060212624A1
• Time in Patent Office: Days
• US Class Current: 710/62
• CPC Class Codes: G06F 13/4072 Drivers or receivers G06F13/4086 takes precedence; for multistate logic circuits H03K19/0002
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A data transceiver using LVDS (low voltage differential signaling) and a portable terminal employing it and a method therefor can cut off an electromagnetic interference (EMI) that occurs upon a high rate data communication and saving an electric power by doing a data communication using LVDS transmission scheme. The portable terminal comprises a USB (universal serial bus) transceiver for receiving a voltage via a USB data cable connected to a data transceiver using an external LVDS, and transmitting and receiving data through a USB device coupled with the USB data cable and the data transceiver, and a controller for recognizing a connection between the data transceiver and the USB data cable based on the voltage provided through the USB data cable and the USB transceiver, and controlling the data transceiver in accordance with a data transfer rate of the USB data cable.

Claims

1. A portable terminal comprising:

a USB (universal serial bus) transceiver for receiving a voltage via a USB data cable connected to a data transceiver using an external LVDS (low voltage differential signaling), and transmitting and receiving data through a USB device coupled with the USB data cable and the data transceiver; and

a controller for recognizing a connection between the data transceiver and the USB data cable based on the voltage provided through the USB data cable and the USB transceiver, and controlling the data transceiver in accordance with a data transfer rate of the USB data cable.

2. The portable terminal as recited in claim 1, wherein the USB transceiver comprises:

a data plus terminal and a data minus terminal for the data transmission and reception between the portable terminal and the USB device; and

a USB data power input terminal for receiving the voltage via the USB data cable.

3. The portable terminal as recited in claim 1, wherein the controller controls the data transceiver to allow a first or second data transmission path to be in a conduction state upon the data transmission and reception at a faster rate than a threshold rate, and to permit a third data transmission path to be in a conduction state upon the data transmission and reception at a slower rate than the threshold rate.

4. A data transmission and reception method for use in a portable terminal, the method comprising the steps of:

a) recognizing a connection between a data transceiver and a USB data cable if a drive voltage of the USB data cable is received;

b) finding a data transfer rate upon a data reception and creating a control signal based on the data transfer rate to thereby allow a first or third data transmission path to be in a conduction state;

c) receiving the data via the conducting data transmission path;

d) finding a data transfer rate upon a data transmission and creating a control signal based on the data transfer rate to thereby permit a second or third data transmission path to be in a conduction state; and

e) transmitting the data via the conducting data transfer path.

5. The method as recited in claim 4, wherein the step b) comprises the steps of:

if the data transfer rate is faster than a threshold rate, producing a first control signal to control the data transceiver for the data reception via the first data transfer path; and

if the data transfer rate is slower than the threshold rate, creating a third control signal to control the data transceiver for the data reception via the third data transfer path.

6. The method as recited in claim 4, wherein the step d) comprises the steps of:

if the data transfer rate is faster than the threshold rate, generating a second control signal to control the data transceiver for the data transmission via the second data transfer path; and

if the data transfer rate is slower than the threshold rate, issuing a third control signal to control the data transceiver for the data transmission via the third data transfer path.