Method and apparatus for communicating with a host
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G06K-007/08
G06K-019/06
출원번호
US-0729113
(2000-12-04)
발명자
/ 주소
Leydier, Robert Antoine
Pomet, Alain Christophe
출원인 / 주소
Schlumberger Malco, Inc., STMicroelectronics, Inc.
대리인 / 주소
Jansson, Pehr B.Jorgenson, Lisa K.
인용정보
피인용 횟수 :
79인용 특허 :
4
초록▼
A method and apparatus is disclosed for communicating with a host. In one embodiment, a smart card has an IC with voltage conditioning circuitry and a pull-up resistor. The smart card, when inserted in a smart card reader coupled to the host, is capable of signaling the host over a bus using the pul
A method and apparatus is disclosed for communicating with a host. In one embodiment, a smart card has an IC with voltage conditioning circuitry and a pull-up resistor. The smart card, when inserted in a smart card reader coupled to the host, is capable of signaling the host over a bus using the pull-up resistor selectively coupled to a voltage output of the voltage conditioning circuitry and a first output of the smart card. The voltage conditioning circuitry output is selectively coupled to the first output through the resistor, responsive to the device being powered by the bus but not transmitting. This tends to pull up the first output to the voltage level of the voltage source, which makes the smart card capable of being properly detected by the host upon the bus being driven by a host. Selectively disconnecting the pull-up resistor while the smart card is transmitting or receiving results in a more balanced differential output signal. Since the pull-up resistor and voltage conditioning circuitry supplying the proper voltage to the pull-up resistor are an integrated part of the IC, no separate contact is required to supply voltage to the resistor. This permits the smart card to be compatible with the contact configuration of certain existing smart cards, and eliminates a need for the pull-up resistor or voltage conditioning circuitry to be included in the smart card reader.
대표청구항▼
A method and apparatus is disclosed for communicating with a host. In one embodiment, a smart card has an IC with voltage conditioning circuitry and a pull-up resistor. The smart card, when inserted in a smart card reader coupled to the host, is capable of signaling the host over a bus using the pul
A method and apparatus is disclosed for communicating with a host. In one embodiment, a smart card has an IC with voltage conditioning circuitry and a pull-up resistor. The smart card, when inserted in a smart card reader coupled to the host, is capable of signaling the host over a bus using the pull-up resistor selectively coupled to a voltage output of the voltage conditioning circuitry and a first output of the smart card. The voltage conditioning circuitry output is selectively coupled to the first output through the resistor, responsive to the device being powered by the bus but not transmitting. This tends to pull up the first output to the voltage level of the voltage source, which makes the smart card capable of being properly detected by the host upon the bus being driven by a host. Selectively disconnecting the pull-up resistor while the smart card is transmitting or receiving results in a more balanced differential output signal. Since the pull-up resistor and voltage conditioning circuitry supplying the proper voltage to the pull-up resistor are an integrated part of the IC, no separate contact is required to supply voltage to the resistor. This permits the smart card to be compatible with the contact configuration of certain existing smart cards, and eliminates a need for the pull-up resistor or voltage conditioning circuitry to be included in the smart card reader. ment to an advanced position along the rod and allow the biasing element to hold the sleeve element against the rod in the advanced position when the movement in the extend direction is stopped or the piston element is moved in the opposite direction, the sleeve element when held against the rod in the advanced position limiting the retraction of the piston element to a predetermined distance relative to the advanced position. ing the test signals to the test pads. 10. The method of claim 9, further comprising a step of: g) prior to contacting step b), removing the test pads from the electrical component. 11. A system for preventing electrostatic discharge through an electrical component prior to and during connection of the electrical component to an additional component, comprising: a solder conductor shunting one or more conductive leads extending from the electrical component to a second conductive lead extending from the electrical component; electrical contacts on the additional component contacting the one or more conductive leads, the second conductive lead, and the one or more solder conductors; and heat applied to the one or more solder conductors until the one or more solder conductors electrically bond the one or more conductive leads and the second conductive lead to the electrical contacts of the additional component and until the one or more solder conductors no longer shunt the one or more conductive leads to the second conductive lead. 12. The system of claim 11, wherein the electrical component is a flex on suspension circuit electrically connected to a read/write head. 13. The system of claim 12, wherein the read/write head has a read element and a write element, and the solder conductor shunts together the conductive leads extending from the read element with conductive leads extending from the write element. 14. The system of claim 12, wherein the flex on suspension circuit has an opening exposing the conductive leads and wherein the solder conductor, the electrical contacts, and the heat are provided within the opening. 15. The system of claim 11, wherein the solder conductor includes a strip of solder tape pressed onto and across the one or more conductive leads and the second conductive lead. 16. The system of claim 15, wherein the strip of solder tape is of a predetermined length. 17. The system of claim 11, further comprising: an electrical conductor shunting the one or more conductive leads to the second conductive lead prior to application of the solder conductor; and test signals applied across the one or more conductive leads and the second conductive lead after removal of the electrical conductor and prior to application of the solder conductor to the one or more conductive leads and the second conductive lead. 18. The system of claim 17, wherein the electrical component has test pads electrically connected to the one or more conductive leads and the second conductive lead and wherein the test signals are applied to the test pads. 19. The system of claim 11, wherein the electrical component is a flying lead flex on suspension circuit electrically connected to a read/write head. 20. A system for preventing electrostatic discharge through an electrical component prior to and during electrically connecting the electrical component to an additional component, comprising: a plurality of conductive leads extending from the electrical component; and a conductor means for i) providing a shunt between one or more conductive leads of the plurality and a second conductive lead of the plurality prior to electrical connection of one or more conductive leads to the additional component, and ii) providing an electrical connection between one or more conductive leads and the additional component following removal of the shunt between the one or more conductive leads and the second conductive lead. 21. The system of claim 20, wherein the conductor means is operable to electrically bond the one or more conductive leads to the additional component upon application of a solder reflow process to the conductor means. 22. The system of claim 21, wherein the electrical component comprises a disc drive flex on suspension circuit. 23. The system of claim 20, wherein the conductor means comprises solder tape. 24. The system of claim 20, wherein the electrical component includes test pads electrically connected to the on
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (4)
Alleven Gary W., Methods, circuits and devices for improving crossover performance and/or monotonicity, and applications of the same in a.
Leaming, Taylor J., Smart card and method that modulates multi-color LED indicative of operational attributes and/or transactions between the smart card and USB port of a USB host.
Leaming, Taylor J., Smart card and method that modulates traffic signaling indicative of operational attributes of the smart card and/or transactions between the smart card and USB port of a USB host.
Davis, James; Petite, Thomas D., System and method for controlling communication between a host computer and communication devices associated with remote devices in an automated monitoring system.
Petite, Thomas D.; Huff, Richard; Aldoretta, David P.; Stevens, Candida, System and method for monitoring remote devices with a dual-mode wireless communication protocol.
Petite, Thomas David; Huff, Richard M; Aldoretta, David P; Stevens, Candida, System and method for monitoring remote devices with a dual-mode wireless communication protocol.
Brownrigg, Edwin B., Systems and methods for facilitating wireless network communication, satellite-based wireless network systems, and aircraft-based wireless network systems, and related methods.
Brownrigg, Edwin B., Systems and methods for facilitating wireless network communication, satellite-based wireless network systems, and aircraft-based wireless network systems, and related methods.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.