CN201995065U - Wake-up circuit and digital television receiving terminal - Google Patents

The utility model provides a wake-up circuit, which is applicable to the technical field of power management and comprises a first switch circuit, a second switch circuit and a third resistor. A signal input end of the first switch circuit is electrically connected with a level signal output interface of a standby system panel key; a signal output end of the first switch circuit is electrically connected with an interrupt trigger signal pin of a bus extender; a signal input end of the second switch circuit is electrically connected with an output control level signal pin of the bus extender; a signal output end of the second switch circuit is electrically connected with the interrupt trigger signal pin of the bus extender; one end of the third resistor is connected with a power supply; and the other end of the third resistor is electrically connected with the interrupt trigger signal pin of the bus extender. By the aid of the technical scheme of the wake-up circuit, a wake-up system can be operated by any key.

A kind of wake-up circuit and receiving terminal for digital television

Technical field

The utility model belongs to the power management techniques leader, relates in particular to a kind of wake-up circuit.

Background technology

Present set-top box generally adopts control chip to realize true standby, behind the standby signal that receives infrared interface or button, software will keep on-the-spot and light standby indicating lamp, close other modules except that kernel, make master chip be in low power consumpting state, GPIO (General Purpose Input Output, general I/O) mouthful keeps the state before the standby, no longer scan button, have only infrared signal and outer interrupt signal can wake master chip up.

In the present technical scheme, most of adopt the false standby scheme of directly turn-offing audio frequency and video output by software, and in fact, set-top box still is in mode of operation, therefore can not the maximum power consumption that reduces under the set-top box standby, so neither environmental protection, not energy-conservation yet; Though this technical method standby fast and waking up, system power dissipation can't be reduced to minimum, is unfavorable for environmental protection and energy-conservation.

Another technical scheme is to adopt chip-scale standby scheme, just after the standby, set-top box can be closed the external power source module, the voltage of retention system kernel work only, farthest reduce power consumption, but can only wake up by the infrared signal of remote controller, and can not wake up by the button of panel.This method can only be waken up by the infrared signal of remote controller behind set-top box standby, can't wake up by panel button.Under the situation that remote controller damages, just can only wake up by restarting set-top box, inconvenient client uses.

Summary of the invention

The purpose of this utility model is to provide a kind of wake-up circuit, is intended to solve the problem that present set-top box can't be waken up fast.

The utility model is achieved in that a kind of wake-up circuit, is used to wake up standby system, and it connects master chip and power supply, and described master chip is provided with bus extender, and described wake-up circuit comprises first switching circuit, the second switch circuit, and the 3rd resistance, wherein:

The signal input part of described first switching circuit electrically connects the level signal output interface of standby system panel button, and the signal output part of first switching circuit electrically connects the interrupt trigger signal pin of bus extender;

The signal input part of described second switch circuit electrically connects the control outputs level signals pin of bus extender, and the signal output part of second switch circuit electrically connects the interrupt trigger signal pin of bus extender;

One end of described the 3rd resistance connects power supply, and the other end electrically connects the interrupt trigger signal pin of bus extender.

More excellent, described first switching circuit comprises first resistance and first triode, the base stage of described first triode electrically connects the level signal output interface of standby system panel button by first resistance, collector electrode electrically connects the interrupt trigger signal pin of bus extender, the electrical ground connection of emitter.

More excellent, described first triode is a NPN type triode.

More excellent, described second switch circuit comprises second resistance and second triode, the base stage of described second triode is by the control outputs level signals pin of second resistance electric connection bus extender, and collector electrode electrically connects the interrupt trigger signal pin of bus extender, grounded emitter.

More excellent, described second triode is a NPN type triode.

Another purpose of the present utility model is to provide a kind of receiving terminal for digital television, and described receiving terminal for digital television comprises described wake-up circuit.

More excellent, described receiving terminal for digital television is set-top box, digital TV integrated machine or network protocol television.

The wake-up circuit that adopts the utility model embodiment to be provided can realize that the set-top box panel any key wakes set-top box up.

Description of drawings

Fig. 1 is the structural representation of the wake-up circuit that provides of the utility model embodiment.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

See also Fig. 1, the wake-up circuit structural representation that is provided for the utility model embodiment.

The wake-up circuit that the utility model embodiment is provided is used to wake up standby system, and it connects master chip and power supply, described master chip is provided with bus extender GPIO, and described wake-up circuit comprises: described wake-up circuit comprises the first switching circuit A, second switch circuit B, the 3rd resistance R 9, wherein:

The signal input part of the first switching circuit A electrically connects the level signal output interface K11 of standby system panel button, and the signal output part of the first switching circuit A electrically connects the interrupt trigger signal pin INT of bus extender GPIO;

The signal input part of second switch circuit B electrically connects the control outputs level signals pin STANDBY of bus extender GPIO, and the signal output part of second switch circuit B electrically connects the interrupt trigger signal pin INT of bus extender GPIO;

One end of the 3rd resistance R 9 connects power supply V, and the other end electrically connects the interrupt trigger signal pin INT of bus extender GPIO.

Concrete, the first switching circuit A comprises first resistance R 10 and the first triode Q1, the base stage of the first triode Q1 electrically connects the level signal output interface K11 of standby system panel button by first resistance R 10, collector electrode electrically connects the interrupt trigger signal pin INT of bus extender GPIO, the electrical ground connection of emitter.The first triode Q1 recommends to use NPN type triode.

Second switch circuit B comprises second resistance R 11 and the second triode Q2, the base stage of the second triode Q2 electrically connects the control outputs level signals pin STANDBY of bus extender GPIO by second resistance R 11, collector electrode electrically connects the interrupt trigger signal pin INT of bus extender GPIO, grounded emitter.The second triode Q2 recommends to use NPN type triode.

Be example with the set-top box below, be described in detail the operation principle of the wake-up circuit that the utility model embodiment provided.

The true standby principle of set-top box is after set-top box receives standby signal (standby command that comprises panel or remote controller), master chip can enter the stand-by operation pattern, by a GPIO pin, control closing of externally fed module simultaneously, light the standby display lamp simultaneously; This GPIO pin is the STANDBY interface among Fig. 1, and the level output signal interface that is arranged on the key control circuit on the panel is K11, and K11 and STANDBY signal can synthesize an interrupt trigger signal INT.Set up the INT logical relation shown in table (1):

Table (1)

When the set-top box operate as normal, the voltage signal of the control outputs level signals interface STANDBY of bus extender GPIO is a high level 1, whether there is button to trigger this circuit and monitoring always with the level output signal interface K11 of key control circuit, if not having button presses, then not conducting of key control circuit, the voltage signal of K11 is a high level 1, if there is button to press, then key control circuit conducting, the voltage signal of K11 are low level 0.

After set-top box is true holding state, panel button and display part circuit meeting one direct power supply, if there is not button to press, the level signal of K11 is a high level 1, if panel has any button to press, then the level signal of K11 is a low level 0; And under holding state, the level signal of STANDBY is a low level 0 always, in actual applications, can light the standby display lamp by a negater circuit.

By the table (1) and Logical relation, can judge, only under holding state and when having button to press, just have interrupt signal INT and export to master chip, thereby realize that any key wakes set-top box up and carries out work.

Another purpose of the present utility model is to provide a kind of receiving terminal for digital television that comprises above-mentioned wake-up circuit, wherein, receiving terminal for digital television be set-top box, digital TV integrated machine or network protocol television (Internet Protocol Television, IPTV).

The utility model embodiment wakes set-top box under the standby up by any key on the set-top box panel, can only be and be not limited to by the switch for the treatment of on the remote controller, or the defective waken up of the starter motor top box that cuts off the power supply again.Under remote controller or the corrupted or lost situation of faceplate part button, still can normally use, both made things convenient for the client to use, also reduced the situation of reprocessing of set-top box, improved the useful life of set-top box product.

The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.