WO2002075743A1

WO2002075743A1 - Circuit arrangement for supplying voltage to a circuit element

Info

Publication number: WO2002075743A1
Application number: PCT/DE2002/000341
Authority: WO
Inventors: Bernd Peter Hopf; Yusuf Kalayci; Claus-Peter Meyer-Bothling; Uwe Schwark; Michael Tolk
Original assignee: Siemens Aktiengesellschaft
Priority date: 2001-03-15
Filing date: 2002-01-31
Publication date: 2002-09-26
Also published as: DE10112577A1

Abstract

The invention relates to a circuit arrangement and a method for supplying voltage to a circuit element (1) which is connected at a first input to a bus line (3) to which a signal voltage is applied, whereby the supply voltage required for the actuation of the circuit element (1) is also drawn from the signal voltage. Said circuit element (1) comprises a second input for an additional supply voltage on the supply voltage line (4) in addition to, normally, one or more signal voltage outlets (5, 6) and a ground connection(GND). According to the invention, the circuit arrangement for supplying voltage to one such circuit element (1) is configured in such a way that the voltage supply line (4) is connected to a voltage regulator (2) which is connected via a connection line (7) to a bus line (3). The actuation of said circuit elements (1) is thus guaranteed at low signal voltages while retaining the possibility of a reset function of the circuit elements (1) upon desired interruptions on the bus line (3).

Description

description

Circuit arrangement for the voltage supply of a switching component

The invention relates to a circuit arrangement and a method for supplying voltage to a switching component which is connected at a first input to a bus line to which a signal voltage is applied, the supply voltage necessary for the operation of the switching component likewise being obtained from the signal voltage. This switching component has a second input for an additional supply voltage and generally one or more signal voltage outputs and a ground connection. Such switching components are manufactured, for example, by the company Dallas Semiconductor under the name Dual Addressable Switch Plus 1-kbit memory (1-wire bus). The exact structure and functionality of these switching components can be found in data sheets from Dallas Semiconductors at w w.dalsemi .com.

It is known that various switching states are to be implemented in electronic circuits with the smallest possible number of data and supply lines. Furthermore, interruptions in communication on the data lines must be recognized. These requirements are particularly met by the so-called 1-wire bus switching components.

It is also known that chip manufacturers are striving to drastically reduce the energy consumption of electronic circuits. Accordingly, an attempt is made to select the signal and supply voltage in the electronic circuits as low as possible. The low signal or supply voltages have a direct effect on the levels on the bus line. When using the 1-wire bus switching components, this means that logical levels can be recognized on the 1-wire bus that are lower than the prescribed level that is required for self-supply and thus for the operation of the 1-wire bus. Bus switching components is necessary.

If the signal voltage on the bus line at the input of the 1-wire bus switching component is too low for a longer period of time, the 1-wire bus data line is torn off. However, this demolition can be used as a reset function. The switching components supplied by the 1-wire bus fall back into their starting position. The application of an additional supply voltage to the second input of the 1-wire bus switching component prevents this demolition.

In many cases, however, it is desirable to tear off the 1-wire bus line. However, if there is an additional supply voltage at the second input of the 1-wire bus switching component, the 1-wire bus switching component maintains its last switching state even if the 1-wire bus line is torn off. A desired reset function is thus prevented.

It is the object of the present invention to provide a technical solution consisting of a circuit arrangement for the voltage supply of a switch component according to the preamble of claim 1 and a method for the voltage supply of a switch component according to the preamble of claim 6, with which a sufficient voltage for operating the switch component is ensured, however, a voltage drop on the bus line results in a voltage drop on the additional supply voltage line of the switching component. The object is achieved by a circuit arrangement for the voltage supply of a switching component with the features of claim 1 and a method for the voltage supply of a switching component with the features of claim 6. Further developments of the invention result from the subordinate claims.

According to the invention, the circuit arrangement for supplying voltage to a switching component which is connected to a bus line to which a signal voltage is present, the supply voltage required for the operation of the switching component being obtained from the signal voltage, the switching component being connected to an additional supply voltage line, that the supply voltage line is connected to a voltage regulator, which in turn is connected to the bus line via a connecting line.

An important advantage of the invention is that switching components can also be operated if the signal voltage applied to the bus line is lower than is necessary for the self-supply of the switching components mentioned. Because a voltage is applied to the additional supply voltage line that is large enough to ensure the self-supply of the switching component and that follows the voltage signal on the bus line in time, such switching components can also be used in the future, including the desired reset function, if in the course of future developments, a further reduction in the operating voltages in electronic circuits is required.

Further advantages of the invention result from the following description, which in connection with the accompanying drawing explains the invention using an exemplary embodiment. The shows in a schematic representation

1 shows an embodiment of a circuit arrangement according to the invention for operating a switching component.

FIG. 1 shows a circuit arrangement for operating a switching component 1, for example a switching component 1, which is manufactured by the company Dallas-Semiconductor under the name Dual Addressable Switch Plus Memory 1-kbit memory and is referred to below as the Dallas switching component 1. The Dallas switching component 1 has a plurality of connections, two of which are the signal outputs 5 and 6, designated as PIO-A and PIO-B, respectively. Another connection is the input to which the bus line 3, referred to as 1 wire bus, is connected, to which the signal voltage is present. The supply voltage required for the operation of the switching component is obtained from the signal voltage present on the bus line 3. This is implemented in such a way that energy is stored in an internal capacitor of the Dallas switching component 1 in periods in which there is a high signal voltage on the bus line 3. In the periods in which there is a low signal voltage on the bus line 3, the Dallas switching component 1 is supplied by the stored energy of the internal capacitor. If a signal voltage that is too low is selected or the periods in which only a low signal voltage is present on the bus line 1 is too large, the energy stored in the capacitor is no longer sufficient to ensure proper operation of the Dallas switching component 1.

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component 1 delivered. The voltage signal led via the connecting line 7 to the voltage regulator 2, which in this example is a square-wave signal, accordingly controls the supply voltage on the supply voltage line 4, as a result of which a square-wave voltage is likewise present at the Dallas switching component 1. That the supply voltage on the supply voltage line 4 follows the voltage signal on the bus line 3 in time. The additional supply voltage on the voltage supply line 4 enables the Dallas switching component 1 to operate properly if, as in the example, the voltage on the bus line 3 is too low.

Values between 2.8 V and 6 V can be set as maximum values for the supply voltage on supply voltage line 4. If, for example, a maximum value of 6 V is set, the square-wave signal on the supply voltage line 4 varies between 6 V and 0 V. The level of the setting of the maximum value is transmitted by the DC or AC voltage source 9 by the voltage regulator 2, which is transmitted via the operating voltage line 8 Voltage specified. For example, an accumulator with 3 V DC voltage is connected as a DC or AC voltage source 9.

In addition to a sufficient supply voltage on the supply voltage line 4 for the operation of the Dallas switching component 1, the present circuit arrangement ensures that an interruption of the voltage signal on the bus line 3 results in an interruption of the supply voltage on the supply voltage line 4, so that the desired interruption of the Voltage signal on bus line 3 as a reset function, ie Falling back of the Dallas switching device 1 can be used in the starting position.

Would one only have an additional supply voltage on the supply voltage line 4 to the Dallas switching component create element 1 that would not follow the voltage signal on bus line 3, ie would be constant, for example, an interruption of the voltage signal on bus line 3 would not result in a change in the switching state at signal outputs 5 and 6 of Dallas switching component 1, since the supply voltage would continue to be present on the supply voltage line 4. The possibility of a reset function would therefore not exist.

One application of such a circuit arrangement is the use in mobile telephones with integrated Bluetooth radio modules. In this application, the voltage on the operating voltage line 8 of the voltage regulator 2 is provided by the battery pack of the mobile telephone. The Bluetooth radio modules are used for data exchange between the mobile phone and other electronic devices such as computers, notebooks, mobile phones, etc., which also have an integrated Bluetooth radio module. The Bluetooth radio module integrated in the mobile phone is connected to one or both signal outputs 5 and 6 of the Dallas switching component 1. Data that are sent via the bus line 3 to the Dallas switching component 1 are sent via the Bluetooth radio modules. If there is no data for a longer period of time or the mobile phone is switched off, so that there is no signal voltage on the bus line 3 anymore, appropriate signal processing in the Dallas switching component 1 causes the Bluetooth radio modules to also be switched off, since the supply voltage on the Supply voltage line 4 follows the voltage signal on bus line 3.

Claims

claims

1) Circuit arrangement for supplying voltage to a switching component (1) which is connected to a bus line (3) to which a signal voltage is applied, the supply voltage required for the operation of the switching component (1) being obtained from the signal voltage, the switching component (1 ) is connected to an additional supply voltage line (4), characterized in that the supply voltage line (4) is connected to a voltage regulator (2), which in turn is connected to the bus line (3).

2) Circuit arrangement according to Claim 1, characterized in that the switching component (1) has at least one signal output line (5, 6) and / or is connected to at least one ground (GND).

3) Circuit arrangement of one of the preceding claims, characterized in that the voltage regulator (2) via the operating voltage line (8) with a DC or AC voltage source (9) and / or ground (GND) is connected.

4) Circuit arrangement according to one of the preceding claims, characterized in that the switching component (1) is a switching component referred to as a Dual-Addressable Switch Plus from the company Dallas-Semicon- ductor.

5) Circuit arrangement according to one of the preceding claims, characterized in that the signal voltage on the bus line (3) or supply line (7) controls the voltage regulator (2) in such a way that the supply voltage on the supply voltage line (4) follows the signal voltage in time.

6) Method for the voltage supply of a switching component (1) which is connected to a bus line (3) to which a signal voltage is applied, the supply voltage necessary for the operation of the switching component (1) being obtained from the signal voltage, the switching component (1 ) is connected to an additional supply voltage line (4), characterized in that the supply voltage applied to the supply voltage line (4) temporally follows the signal voltage on the bus line (3).