CN210297545U

CN210297545U - Chip power supply circuit and chip

Info

Publication number: CN210297545U
Application number: CN201921602143.4U
Authority: CN
Inventors: 不公告发明人
Original assignee: Guangzhou Zhono Electronic Technology Co ltd
Current assignee: Guangzhou Zhongnuo Microelectronics Co ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-04-10
Anticipated expiration: 2029-09-24

Abstract

The utility model discloses a chip supply circuit and have its chip for the chip unit power supply, chip supply circuit includes: the first end of the voltage division module is connected with a VCAP pin of the chip unit; and the first end of the power supply module is connected with the second end of the voltage division module, and the second end of the power supply module is suitable for being connected with a power supply of equipment. Through the utility model discloses a chip supply circuit can provide stable power supply for the VCAP pin, ensures that the VCAP pin provides core voltage, and the chip normally works.

Description

Chip power supply circuit and chip

Technical Field

The utility model belongs to the technical field of the chip technique and specifically relates to a chip supply circuit is related to and a chip that has this chip supply circuit.

Background

The chip can only work stably when being powered on normally, namely, the power supply voltage and the power supply current of the chip reach the rated range values, and if the voltage or the current of the chip cannot meet the requirements, the chip stops working or makes mistakes due to unstable working. Under normal conditions, the chip is powered on by the VCC pin, wherein the VCC pin is internally connected with a detection circuit which can detect whether the current voltage and current meet the normal working requirement or reach the standard of rated working. Only after the requirement is met, the chip can start reset operation, meanwhile, a core voltage is released from a VCAP pin of the chip inside the chip to supply power to the core, the core voltages of different chips may be different, but the chip can start real operation only when the core voltage of the chip is at the normal working value of the chip.

However, when the power (voltage and current) externally supplied to the VCC pin is a critical value of the reset detection circuit inside the chip, the VCC pin cannot provide stable power supply, that is, the VCAP pin cannot provide core voltage to supply power to the core, and thus the chip cannot be normally powered on and even cannot normally operate.

For a chip, under the condition that voltage or current which can be externally provided for the chip is just a critical value for electrifying a chip VCC pin, when the chip starts to work, the VCAP pin of the chip can divide part of the externally provided current to supply power to a core, at the moment, the external current is reduced, and the current is lower than the critical value, namely, the external cannot provide stable current to the VCC pin, so that the chip stops working, the chip can work only when the external current reaches the critical value, but the chip still needs to extract the external current during working, and the operation is repeated, so that the VCC pin cannot provide stable core voltage to the VCAP pin, and the chip cannot be electrified normally. Moreover, when the chip operates stably, the voltage of the VCAP pin cannot exceed its rated value, and if the voltage or current of the externally provided VCAP pin is too large, the operation of the chip may be unstable, and even the chip may be burned.

Disclosure of Invention

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide a chip supply circuit, this chip supply circuit can provide stable power supply for the VCAP pin, ensures that the VCAP pin provides core voltage, and the chip normally works.

A second object of the present invention is to provide a chip.

In order to solve the above problem, the utility model discloses chip supply circuit of first aspect embodiment for the chip unit power supply, include: the first end of the voltage division module is connected with a VCAP pin of the chip unit; and the first end of the power supply module is connected with the second end of the voltage division module, and the second end of the power supply module is suitable for being connected with a power supply of equipment.

According to the utility model discloses a chip supply circuit, through setting up power module and voltage division module, voltage division module is connected with the VCAP pin, power module links to each other with voltage division module and equipment power respectively, equipment is direct to be the power supply of VCAP pin promptly, the VCAP pin that is exactly the chip from the outside directly provides stable power supply, even the voltage of the VCC pin of chip is in chip inside detection circuitry's that resets critical value or unstability, also can guarantee that the VCAP pin provides stable core voltage and supply power for the chip core, guarantee that the chip is normally gone up the electricity, and normal work.

In some embodiments, the first terminal of the power module is further connected to a VCC pin of the chip unit, so that power can be supplied to the VCC pin and the VCAP pin at the same time.

In some embodiments, the power module comprises: the first end of the first voltage stabilizing diode is suitable for being connected with an equipment power supply, the second end of the first voltage stabilizing diode is connected with the second end of the voltage dividing module, the first end of the first capacitor is connected with the second end of the first voltage stabilizing diode, and the second end of the first capacitor is connected with the grounding end.

In some embodiments, the chip includes a VCC pin, and the second terminal of the first zener diode is further connected to the VCC pin.

In some embodiments, the voltage divider module comprises: the first end of the resistance unit is connected with the VCAP pin of the chip unit, the second end of the resistance unit is connected with the first end of the power module, namely, the circuit unit provides an electric energy branch to provide electric energy for the VCAP pin, so that the VCAP pin can provide core voltage, and a foundation is provided for normal power-on work of the chip.

In some embodiments, the resistance unit includes one resistance or a plurality of resistances arranged in series and parallel.

In some embodiments, the voltage dividing module further includes a second capacitor, a first end of the second capacitor is connected to the first end of the resistor unit and the VCAP pin, respectively, and a second end of the second capacitor is grounded.

In some embodiments, the voltage divider module further comprises: and the first end of the second voltage stabilizing diode is grounded, and the second end of the second voltage stabilizing diode is respectively connected with the first end of the second capacitor and the VCAP pin of the chip unit, so that the voltage supplied to the VCAP pin is more stable.

In some embodiments, the voltage divider module further includes a first diode and a second diode, a first end of the first diode is connected to the first end of the second capacitor and the VCAP pin, respectively, a second end of the first diode is connected to the first end of the second diode, and a second end of the second diode is grounded. The first diode and the second diode can play a role in stabilizing voltage, so that the voltage supplied to the VCAP pin is more stable.

In some embodiments, the voltage divider module includes a linear regulator, an input terminal of the linear regulator is connected to the second terminal of the first zener diode, a ground terminal of the linear regulator is grounded, and an output terminal of the linear regulator is connected to the VCAP pin.

In some embodiments, the voltage divider module further includes a second capacitor, a first end of the second capacitor is connected to the output terminal of the linear voltage regulator and the VCAP pin, and a second end of the second capacitor is grounded.

The embodiment of the second aspect of the present invention provides a chip, which includes a chip unit and the chip power supply circuit described in the above embodiments.

According to the utility model discloses the chip, through setting up chip supply circuit, the follow outside directly provides the power supply for the VCAP pin, even VCC pin power supply is in the critical value or unstable, also can guarantee that VCAP provides stable core voltage, guarantees normally to go up electricity and work.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a block diagram of a chip power supply circuit according to one embodiment of the present invention;

fig. 2 is a block diagram of a chip power supply circuit according to another embodiment of the present invention;

fig. 3 is a schematic diagram of a chip power supply circuit according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a chip power supply circuit according to another embodiment of the present invention;

fig. 5 is a schematic diagram of a chip power supply circuit according to another embodiment of the present invention;

fig. 6 is a schematic diagram of a chip power supply circuit according to another embodiment of the present invention;

fig. 7 is a block diagram of a chip according to one embodiment of the invention;

reference numerals:

a chip 100;

a chip power supply circuit 1; a chip unit 2; a device power supply 3; a power supply module 10; a voltage division module 20; a resistance unit 21.

Detailed Description

Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.

The chip power supply circuit provided by the embodiment of the first aspect of the present invention is described below with reference to the accompanying drawings, and can provide stable electric energy for the VCAP pin, and can ensure normal operation of the chip when a current value or a voltage value is provided externally and is in a critical condition of the VCC pin.

Fig. 1 shows the structure block diagram of the chip power supply circuit provided by an embodiment of the present invention, the chip power supply circuit provided by the embodiment of the present invention is used for supplying power to the chip unit, as shown in fig. 1, the chip power supply circuit 1 includes a power module 10 and a voltage dividing module 20.

The first terminal of the power module 10 is connected to the second terminal of the voltage divider module 20 and the second terminal thereof is adapted to be connected to the device power supply 3. A first terminal of the voltage divider module 20 is connected to a VCAP pin of the chip unit.

Specifically, the second end of the power module 10 may be connected to the device power supply 3 through a connection terminal, that is, the device directly supplies power, for example, a power supply of a printer, a copier, or the like of an imaging device, and the voltage dividing module 20 distributes appropriate power to the VCAP pin of the chip, so that the device directly supplies power to the VCAP pin, and therefore, even if the voltage supplied to the VCC pin of the chip is at a critical value or is unstable, the VCAP pin can be guaranteed to supply stable core voltage to the core of the chip, thereby guaranteeing normal power-on and operation of the chip.

According to the utility model discloses chip supply circuit 1, through setting up power module 10 and voltage division module 20, power module 10 is connected with equipment power supply 3 and voltage division module 20 respectively, and voltage division module 20 is connected with the VCAP pin of chip, directly supplies power for the VCAP pin through equipment power supply 3 promptly, does not receive the influence of VCC pin power supply, guarantees that the VCAP pin provides stable kernel voltage, provides the basis for chip normal power-on and work.

In some embodiments, as shown in fig. 2, the first terminal of the power module 10 is further connected to a VCC pin of the chip, and can supply power to the VCC pin. Specifically, when the chip is powered on, the power module 10 inputs electric energy from the device power supply, and the electric energy is respectively provided for the voltage dividing module 20 and the VCC pin of the chip through the power module 10, a detection circuit is arranged in the VCC pin and used for detecting whether the current voltage and current meet the normal working requirements or not, or whether the current voltage and current meet the standard of rated working or not, if the current voltage and current meet the requirements, the chip starts to reset, meanwhile, the voltage dividing module 20 distributes electric energy required by VCAP from the power module 10 to the VCAP pin, and then the VCAP pin releases core voltage inside the chip to supply power to the core of the chip, so that the chip is normally powered on and works.

The device power supply 3 supplies power to the VCC pin and the VCAP pin through the first end of the power module 10, and since the voltage required by the VCAP pin is lower than the minimum voltage of the VCC pin during normal operation, for example, the rated operating voltage range of the chip label is 1.8V-3.3V, and the voltage of the VCAP pin may be generally less than 1.8V. Therefore, even if the power supply value falls within a critical range or is unstable for the detection voltage of the VCC pin, the voltage requirement for the VCAP pin can be satisfied. Therefore, even VCC pin voltage value is in criticality or unstability, through the utility model discloses supply circuit 1, by the outside direct VCAP pin power supply, can make the VCAP pin provide stable kernel voltage, ensure that the chip is normal to be gone up electricity and work to and, can adjust the voltage of stabilizing the VCAP pin through bleeder circuit 20, make the voltage and the electric current that provide the VCAP pin all in rated range, avoid appearing the condition of burning out the chip because of the voltage that provides exceeds its rated range.

According to the utility model discloses a chip supply circuit 1 can be to the problem of chip electricity under the specific condition for the chip can normally go up the electric work under critical condition, wherein, the specific condition can be thought of as, the outside can provide the voltage and the electric current of chip, one of them or two critical values that just are in the VCC pin electricity of chip, the condition of electricity on the chip is all satisfied to other conditions, cause the electricity unstability on the chip, perhaps because electric current, voltage consumption's unstability directly causes the electricity to fail on the chip. The utility model discloses chip supply circuit 1, through setting up power module 10 and partial pressure module 20, link to each other with chip VCC pin and VCAP pin respectively by power module 10, even under the critical voltage of electricity and the condition of electric current on the VCC pin, supply power for VCC pin and VCAP pin simultaneously, ensure chip normal power-on work.

That is, an acceptable voltage is directly provided to the VCAP pin of the chip from the outside, that is, the voltage released by the VCAP pin when the chip works normally, and generally, the voltage required by the VCAP pin is lower than the power-on voltage of the VCC pin.

In order to enable the chip to stably work, power needs to be continuously supplied to a chip VCC pin, the voltage of the VCAP pin cannot exceed a rated value of the VCAP pin, and it is further guaranteed that the current of the VCAP pin cannot be too large, so that the chip is prevented from being unstable in work or burnt. In an embodiment, the voltage or current of the VCAP pin may be prevented from exceeding a rated value by adjusting the power of the VCAP pin according to the voltage dividing module 20, so as to prevent the chip from being damaged.

The power module 10 and the voltage divider module 20 are further described below, respectively.

In some embodiments, as shown in fig. 3, the power supply module 10 includes a first capacitor C2 and a first zener diode D1.

Wherein, a first terminal of the first zener diode D1 is adapted to be connected to the device power supply 3, and a second terminal of the first zener diode D1 is connected to a second terminal of the voltage dividing module 20, that is, the second terminal of the first zener diode D1 may be used as the first terminal of the power supply module 10; a first terminal of the first capacitor C2 is connected to the second terminal of the first zener diode D1, and a second terminal of the first capacitor C2 is connected to the ground GND. The first voltage stabilizing diode D1 can stabilize the voltage, so that the voltage supplied to the chip by the power supply device is more stable, and the first capacitor C2 can play a role in filtering to avoid interference. In some embodiments, as shown in fig. 3, the second terminal of the first zener diode D1 is further connected to the VCC pin of the chip, i.e., provides a voltage or a current to the VCC pin and the VCAP pin of the chip.

In some embodiments, as shown in fig. 3, the voltage dividing module 20 includes a resistor unit 21, wherein a first terminal of the resistor unit 21 is connected to the VCAP pin of the chip unit, and a second terminal of the resistor unit 21 is connected to a first terminal of the power supply module, as shown in fig. 3, that is, the second terminal of the resistor unit 21 is respectively connected to the first terminal of the first capacitor C2 and the second terminal of the first zener diode D1, that is, the voltage is divided by the resistor unit 21 to provide the VCAP pin voltage, and the branch voltage can be reduced by the resistor unit 21, so that the voltage and the current of the VCAP pin are both within a rated range, thereby ensuring that the chip is normally powered on. In an embodiment, the resistor unit 21 may include one resistor or a plurality of resistors arranged in series and parallel, and may be set and selected according to the voltage requirement of the VCAP pin.

Further, the voltage dividing module 20 may further include a second capacitor C3, wherein a first end of the second capacitor C3 is connected to the first end of the resistor unit 21 and the VCAP pin, respectively, and a second end of the second capacitor C3 is connected to the ground GND. The second capacitor C3 may act as a filter to reduce the interference of the electrical signal provided to the VCAP pin.

Specifically, as shown in fig. 3, P1 is a connection terminal, and a first terminal of a first zener diode D1 of the power module 10 may be connected to the device power supply 3 through P1 to provide a voltage outside the chip. A second end of the first zener diode D1 is connected to the VCC pin and is connected to the VCAP pin through the resistor unit 21, wherein the branch where the resistor unit 21 is located is used to supply power to the VCAP pin of the chip, and the voltage provided by the branch of the resistor unit 21 needs to be in the voltage and current range required by the VCAP pin, in an embodiment, as shown in fig. 3, the resistor unit 21 may be implemented by using a single resistor R2, and a minimum value of the resistor R2 is (VCC voltage — rated voltage value of VCAP)/VCAP maximum current value; the maximum value of the resistance R2 (VCC voltage — VCAP rated voltage value)/VCAP minimum current value) may be, for example, a resistance of 15K, so as to reduce the current of the branch, and may divide a part of the voltage, so that the voltage and the current of the VCAP pin are both within the rated range. By respectively supplying power to the VCC pin and the VCAP pin from the outside, even if the power supply of the VCC pin is in a critical value or is unstable, the VCAP pin can also provide stable core voltage, and the normal power-on of a chip is ensured.

Further, in some embodiments, in order to improve stability of the voltage and current supplied to the VCAP pin, as shown in fig. 4, the voltage dividing module 20 may further include a second zener diode D2, wherein a first terminal of the second zener diode D2 is connected to the ground GND, a second terminal of the second zener diode D2 is connected to the first terminal of the second capacitor C3 and the VCAP pin, respectively, and the voltage supplied to the VCAP pin may be further stabilized by adjusting a resistance value of the resistor and increasing the second zener diode D2.

In some embodiments, two common diodes may be used to provide the voltage to the VCAP pin, as shown in fig. 5, the voltage dividing module 20 further includes a first diode D3 and a second diode D2, a first terminal of the first diode D3 is connected to the first terminal of the second capacitor C3 and the VCAP pin, respectively, a second terminal of the first diode D3 is connected to the first terminal of the second diode D2, and a second terminal of the second diode D2 is connected to the ground terminal GND. Because the voltage or current of the VCAP pin of the chip cannot exceed the rated range, different diodes can be specifically used according to the requirements of the chip, for example, if the VCAP pin of the chip cannot be greater than 1.5V, two diodes with a voltage drop of 0.7V can be used to provide 1.4V voltage to the VCAP pin, so as to stably supply power to the VCAP pin, and enable the chip to normally work on.

In other embodiments, as shown in fig. 6, the voltage divider module 20 includes a linear regulator LDO (lowdropout regulator), wherein an input terminal of the linear regulator LDO is connected to the second terminal of the first zener diode D1, a ground terminal of the linear regulator LDO is connected to the ground terminal GND, and an output terminal of the linear regulator LDO is connected to the VCAP pin, an excess voltage is subtracted from the input voltage of the power supply module 20 by the linear regulator to generate a regulated output voltage to be provided to the VCAP pin, so as to directly provide a stable power supply to the VCAP pin from the outside, and even if the power supply to the VCC pin is critical or unstable, the normal power-on operation of the chip can be ensured.

In an embodiment, as shown in fig. 6, based on the linear regulator LDO, the voltage dividing module 20 may further include a second capacitor C3, wherein a first end of the second capacitor C3 is connected to the output terminal of the linear regulator LDO and the VCAP pin, respectively, and a second end of the second capacitor C3 is connected to the ground terminal GND, so that signal interference of the voltage or current supplied to the VCAP pin is reduced through the second capacitor C3, thereby further improving stability.

In summary, according to the utility model provides a chip supply circuit 1, through setting up power module 10 and voltage division module 20, realize directly being the power supply of VCAP pin from the outside, thereby when VCC pin power supply is in critical value or unstability, also can make the VCAP pin provide stable kernel voltage, and, power module 10 can link to each other with chip VCC pin and VCAP pin respectively, VCC pin and the VCAP pin power supply for the chip simultaneously, and through resistive element 21, components and parts such as zener diode or linear regulator LDO, adjust the electric energy of stabilizing the VCAP pin, avoid appearing the condition that burns out the chip because of the voltage that provides surpasss its rated range, thereby make the chip also can normally go up electricity under critical condition, and stable work.

Based on the chip power supply circuit 1 of the above embodiment, a chip provided according to an embodiment of the second aspect of the present invention is described below with reference to fig. 7. In embodiments, the chip may be used in an imaging device, for example, the imaging device may include a printer, copier, or the like.

Fig. 7 is a block diagram of a chip according to an embodiment of the present invention, and as shown in fig. 7, the chip 100 includes the chip power supply circuit 1 and the chip unit 2 of the above-described embodiment. The structure of the chip power supply circuit 1 can refer to the description of the above embodiments.

Specifically, when the chip 100 is used in an imaging device, for example, a printer installs a consumable chip, the chip 100 may be connected to a device power supply 3 through a connection terminal, the device power supply 3 provides an external voltage to the chip power supply circuit 1, the chip power supply circuit 1 supplies power to the chip unit 2, that is, the device directly supplies power to the VCAP pin in the chip unit 2, so that the chip 100 is normally powered on to operate, even if the power supply of the VCC pin of the chip 100 is critical or unstable, the chip power supply circuit 1 directly supplies power to the VCAP pin, and thus the chip 100 can be normally powered on, and communication and interaction between the chip 100 and the imaging device are realized.

According to the utility model discloses chip 100 through the chip supply circuit 1 that adopts above-mentioned embodiment, can directly be the power supply of chip VCAP pin through the outside, does not receive the influence of VCC pin power supply for the VCAP pin provides and stabilizes core voltage, ensures that the chip is normally gone up the electricity.

In the description of the present invention, "a plurality" means two or more.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A chip power supply circuit for supplying power to a chip unit, comprising:

the first end of the voltage division module is connected with a VCAP pin of the chip unit;

and the first end of the power supply module is connected with the second end of the voltage division module, and the second end of the power supply module is suitable for being connected with a power supply of equipment.

2. The chip power supply circuit according to claim 1, wherein the first terminal of the power module is further connected to a VCC pin of the chip unit.

3. The chip power supply circuit according to claim 1 or 2, wherein the power supply module comprises:

the first end of the first voltage stabilizing diode is suitable for being connected with an equipment power supply, and the second end of the first voltage stabilizing diode is connected with the second end of the voltage dividing module;

and the first end of the first capacitor is connected with the second end of the first voltage stabilizing diode, and the second end of the first capacitor is connected with the ground terminal.

4. The chip power supply circuit according to claim 1 or 2, wherein the voltage dividing module comprises:

and the first end of the resistor unit is connected with the VCAP pin of the chip unit, and the second end of the resistor unit is connected with the first end of the power supply module.

5. The chip power supply circuit of claim 4, wherein the voltage divider module further comprises:

and a first end of the second capacitor is connected with the first end of the resistor unit and the VCAP pin respectively, and a second end of the second capacitor is grounded.

6. The chip power supply circuit of claim 5, wherein the voltage divider module further comprises:

and a first end of the second voltage stabilizing diode is grounded, and a second end of the second voltage stabilizing diode is respectively connected with a first end of the second capacitor and a VCAP pin of the chip unit.

7. The chip power supply circuit of claim 5, wherein the voltage divider module further comprises:

the first end of the first diode is connected with the first end of the second capacitor and the VCAP pin respectively, the second end of the first diode is connected with the first end of the second diode, and the second end of the second diode is grounded.

8. The chip power supply circuit of claim 3, wherein the voltage divider module comprises:

and the input end of the linear voltage stabilizer is connected with the second end of the first voltage stabilizing diode, the ground end of the linear voltage stabilizer is grounded, and the output end of the linear voltage stabilizer is connected with the VCAP pin.

9. The chip power supply circuit of claim 8, wherein the voltage divider module further comprises:

and a first end of the second capacitor is connected with the output end of the linear voltage stabilizer and the VCAP pin respectively, and a second end of the second capacitor is grounded.

10. A chip comprising a chip unit and a chip supply circuit as claimed in any one of claims 1 to 9.