SEQUENCING CONTROL CIRCUIT

• US 20090212834A1
• Filed: 05/09/2008
• Published: 08/27/2009
• Est. Priority Date: 02/22/2008
• Status: Abandoned Application

• Current Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Inventors: ZHANG, XIANG
• Application Number:
  US12/118,652
• Publication Number:
  US 20090212834A1
• Time in Patent Office: Days
• US Class Current: 327/143
• CPC Class Codes: G06F 1/28 Supervision thereof, e.g. detecting power-supply failure by out of limits supervision

Abstract

A sequencing control circuit includes an electronic component configured for controlling a signal output to a motherboard, and input voltages being input to the sequencing control circuit. The input voltages are connected to an input terminal of the electronic component. The electronic component includes a preset threshold and input voltage requirements. The electric component is configured such that only when all of the required input voltages rise to their peak values and the voltage of the input terminal of the electronic component reaches the threshold. The electronic component is triggered, and an output terminal of the electronic component outputs a high level signal to the motherboard.

Claims

1. A sequencing control circuit for controlling a motherboard, the sequencing control circuit comprising:

an electronic component configured for controlling a signal output to the motherboard; and

input voltages being input to the sequencing control circuit, the input voltages connected to an input terminal of the electronic component;

wherein the electronic component comprises a preset threshold and input voltage requirements, the electric component is configured such that only when all of the required input voltages rise to their peak values and the voltage of the input terminal of the electronic component reaches the threshold, the electronic component is triggered, and an output terminal of the electronic component outputs a high level signal to the motherboard.

2. The sequencing control circuit as described in claim 1, wherein a resistor is connected between the input voltages of the sequencing control circuit and ground.

3. The sequencing control circuit as described in claim 1, wherein a plurality of circuits is respectively connected between the input voltages of the sequencing control circuit and the input terminal of the electronic component.

4. The sequencing control circuit as described in claim 3, wherein each circuit comprises a resistor and two parallel connected resistors serial connecting to the resistor.

5. The sequencing control circuit as described in claim 1, wherein the input voltages are respectively +3.3V, +5V, and +12V.

6. The sequencing control circuit as described in claim 1, wherein the electronic component is a chip.

7. A method for controlling the sequencing of a motherboard, the method comprising of providing:

the motherboard supplied with a first voltage and then supplied with a second voltage secondly, the first voltage being different from the second voltage;

wherein the first and second voltages being input to a control circuit, the control circuit outputting a threshold voltage when the first voltage and second voltage provided simultaneously; and

the control circuit connected to a chip, the chip to be triggered by the threshold voltage and output a third voltage to the circuit instead of the second voltage, the third voltage being equal to the second voltage.

8. The method as described in claim 7, wherein the control circuit comprises a first circuit and a second circuit, the first voltage being input to the first circuit, the second voltage being input to the second circuit.

9. The method as described in claim 8, wherein the first circuit and the second circuit both comprise a resistor and two parallel connected resistors serial connecting to the resistor.

10. The method as described in claim 7, wherein a resistor is connected between the control circuit and ground.

12. The method as described in claim 10, wherein three input voltages of the motherboard are respectively +3.3V, +5V and +12V.

13. The method as described in claim 10, wherein each circuit is consisted of a resistor and two parallel connected resistors serial connecting to the resistor.

11. A method for ensuring normal sequencing of a motherboard, the method comprising:

providing;

three input voltages of the motherboard rising to their peak values respectively;

three circuits connecting three input voltages respectively to a common node for outputting a particular voltage; and

the particular voltage being input to a chip for triggering the chip;

wherein the chip outputs a signal to the motherboard, the signal is sent only after three input voltages of the motherboard have risen to their peak values for ensuring normal sequencing of the motherboard.