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Control circuitry for providing an interface between connectable terminal and peripheral device circuitry

A technology for peripheral equipment and terminal equipment, applied in the direction of logic circuit coupling/interface, logic circuit connection/interface arrangement, logic circuit, etc. using field effect transistors

Inactive Publication Date: 2008-12-31
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in undesired audio level changes

Method used

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  • Control circuitry for providing an interface between connectable terminal and peripheral device circuitry
  • Control circuitry for providing an interface between connectable terminal and peripheral device circuitry
  • Control circuitry for providing an interface between connectable terminal and peripheral device circuitry

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0057] Except that the diode 418 is now replaced by a switch, and there is also a new pin V at the accessory side 413 DD Figure 5 and Figure 6 are the same as Figure 4 except that Ctrl 519 is used to control the switch. Throughout the specification, the same numerical designations are used to describe the same modules. The interface between the terminal 401 and the ASIC 413 of the accessory 402 is called a bus in this specification, which may be, for example, a connector or a wire between the terminal 401 and the ASIC 413 of the accessory 402 .

[0058] In FIG. 5, diode 418 of FIG. 4 is replaced by switch 518, which in this case is an analog switch. switch 518 can be controlled by the accessory side V DD Ctrl 519 to control. The switch can be open (high resistance) or closed (low resistance). One end of switch 518 (node ​​520) is connected to R serial 417, while the other end (node ​​521) is connected to V of ASIC 413 of accessory 402 DD 415. connected to R serial T...

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PUM

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Abstract

Control circuitry for providing an interface between connectable terminal and peripheral device circuitry, wherein the peripheral device circuitry comprises a bus line for transferring data and power between the peripheral device circuitry and the terminal device circuitry; a charge storage device arranged to receive power from the terminal device circuitry over the bus line and to supply the power to the control circuitry; wherein the control circuitry is operable to connect the charge storage device to the bus line to receive power for storage in response to the terminal device circuitry transmitting a first data value represented by a higher voltage level and to disconnect the charge storage device from the bus line in response to the terminal device circuitry transmitting a second data value represented by a lower voltage level, to prevent the charge storage device from discharging over the bus.

Description

technical field [0001] The invention relates to a control circuit for providing an interface between a connectable terminal and a peripheral circuit. Background technique [0002] Various accessories or peripheral devices can be connected to electronic devices such as mobile phone handsets. A device to which a peripheral or accessory is connected is called a terminal. An example of an accessory that can be connected to various terminals is a headset. The interface between the terminal and the accessory can be accomplished using a wired connector or alternatively using a wireless connection. In a single wired connection, audio and data signals may need to be carried, and the terminal may also provide power to the accessory. [0003] figure 1 A headset 10 is shown which can be connected to a mobile phone handset, for example. The earphone 10 includes a left speaker 11 , a right speaker 12 and a plug 13 . figure 2 gives in more detail figure 1 The plug 13 of the earphon...

Claims

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Application Information

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IPC IPC(8): H04R3/00
CPCH04L25/0264H04W52/0229A61K2039/505C07K16/2803C07K16/2821C07K16/2833C07K16/4283C07K2317/21C07K2317/622C07K2317/73C07K2317/732C07K2317/75C07K2317/94Y02D30/70H04L25/02H04M1/6058H04R19/016H03K19/018592H03K19/0185H04R1/06H04R3/00H04R19/01A61P35/00A61K39/395C07K16/28
Inventor H·林德拉尔S·扎特勒
Owner NOKIA TECHNOLOGLES OY