CN213027810U - Chip start control circuit and PC board - Google Patents
Chip start control circuit and PC board Download PDFInfo
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- CN213027810U CN213027810U CN202022087444.7U CN202022087444U CN213027810U CN 213027810 U CN213027810 U CN 213027810U CN 202022087444 U CN202022087444 U CN 202022087444U CN 213027810 U CN213027810 U CN 213027810U
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Abstract
The utility model relates to a chip start control circuit and PC board, a chip start control circuit, the chip start control circuit is used for starting the chip, the chip is provided with the enable pin; the chip starting control circuit comprises an enabling starting module, the enabling starting module comprises a first pull-up resistor and a first pull-down resistor, the first pull-up resistor is connected with the first pull-down resistor in series, the first pull-up resistor is also used for being connected with a first external input voltage end, and the first pull-down resistor is also used for being connected with the ground; the connection end of the first pull-up resistor and the first pull-down resistor connected in series is connected with the enable pin of the chip, and the first pull-up resistor and the first pull-down resistor connected in series are used for controlling the voltage input by the enable pin to meet a first logic level of the chip. The chip starting control circuit can start the chip starting control circuit under the condition of ultra-low input voltage.
Description
Technical Field
The utility model relates to a chip starts technical field, especially relates to a chip start control circuit and PC board.
Background
With the development of electronic technology, electronic products are becoming more and more popular at present, and the electronic products are basically applied to various industries. Various chips are integrated in current electronic products, and various circuit functions are realized through the various chips. Generally, a pin of a chip needs to reach a specific logic level range to start and realize a corresponding function. However, in a specific application process, due to the influence of various peripheral circuits and input voltages, the voltage input by the pins of the chip cannot reach a specified logic level, and the chip cannot be normally used at this time.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a chip start control circuit capable of starting a chip under ultra-low input voltage.
A chip starting control circuit is used for starting a chip, and the chip is provided with an enabling pin; the chip starting control circuit comprises an enabling starting module, the enabling starting module comprises a first pull-up resistor and a first pull-down resistor, the first pull-up resistor is connected with the first pull-down resistor in series, the first pull-up resistor is also used for being connected with a first external input voltage end, and the first pull-down resistor is also used for being connected with the ground;
the connection end of the first pull-up resistor and the first pull-down resistor connected in series is connected with the enable pin of the chip, and the first pull-up resistor and the first pull-down resistor connected in series are used for controlling the voltage input by the enable pin to meet a first logic level of the chip.
Preferably, the chip is a chip of type RT 8205.
Preferably, the chip is provided with a DVDA pin; the chip starting control circuit also comprises a first voltage input control module, wherein the first voltage input control module comprises a second pull-up resistor and a second pull-down resistor; the second pull-up resistor is connected in series with the second pull-down resistor, the second pull-up resistor is also used for being connected with a second external input voltage end, and the second pull-down resistor is also used for being connected with the ground; the connecting end of the second pull-up resistor connected in series with the second pull-down resistor is connected with a DVDA pin of the chip, and the second pull-up resistor and the second pull-down resistor connected in series are used for controlling the voltage input by the DVDA pin to meet a second logic level of the chip.
Preferably, the chip is provided with a DVD pin; the chip starting control circuit also comprises a second voltage input control module, wherein the second voltage input control module comprises a third pull-up resistor and a third pull-down resistor; the third pull-up resistor is connected in series with the third pull-down resistor, the third pull-up resistor is also used for being connected with a third external input voltage end, and the third pull-down resistor is also used for being connected with the ground; the connecting end of the third pull-up resistor and the third pull-down resistor connected in series is connected with the DVD pin of the chip, and the third pull-up resistor and the third pull-down resistor connected in series are used for controlling the voltage input by the DVD pin to meet a third logic level of the chip.
Preferably, the chip start control circuit further comprises an ALW _ EN enabling module, and the RT8205 type chip is provided with an ALW _ EN input voltage terminal; the ALW _ EN enabling module comprises a fourth pull-up resistor and a fourth pull-down resistor, the fourth pull-up resistor is connected with the fourth pull-down resistor in series, the fourth pull-up resistor is further used for being connected with a fourth external input voltage end, and the fourth pull-down resistor is further used for being connected with the ground;
the fourth pull-up resistor and the fourth pull-down resistor are connected in series, a connection end of the fourth pull-up resistor and the fourth pull-down resistor are connected with the ALW _ EN input voltage end, and the fourth pull-up resistor and the fourth pull-down resistor are connected in series and used for controlling the voltage input by the ALW _ EN input voltage end to meet the fourth logic level of the chip.
Preferably, the RT8205 type chip is provided with an 8205_ entry 1 pin and an 8205_ entry 2 pin, and the ALW _ EN input voltage terminal comprises an 8205_ entry 1 pin and an 8205_ entry 2 pin; the fourth pull-up resistor and the fourth pull-down resistor which are connected in series are used for controlling the voltage input by the 8205_ ENTRIP1 pin and the 8205_ ENTRIP2 pin to meet a fourth logic level of the chip.
The utility model provides a PC board, the PC board includes the chip of RT8205 model and above-mentioned arbitrary chip start control circuit, chip start control circuit with the chip of RT8205 model is connected for the start-up of the chip of control RT8205 model.
The chip starts the control circuit and the PC board, and the chip is provided with an enabling pin; the chip starting control circuit comprises an enabling starting module, the enabling starting module comprises a first pull-up resistor and a first pull-down resistor, the first pull-up resistor is connected with the first pull-down resistor in series, the first pull-up resistor is also used for being connected with a first external input voltage end, and the second pull-down resistor is also used for being connected with the ground; the first pull-up resistor and the first pull-down resistor which are connected in series are used for controlling the voltage input by the enable pin to meet the first logic level of the chip. Therefore, when the voltage input by the enable pin of the chip does not meet the first logic level corresponding to the enable pin and the chip cannot be started, the voltage input by the enable pin can meet the first logic level of the chip by adjusting the first pull-up resistor and the first pull-down resistor which are connected in series, and the chip is started.
Drawings
FIG. 1 is a block diagram of a chip enable control circuit according to an embodiment;
FIG. 2 is a diagram of the circuit connections of enable module 201 in one embodiment;
FIG. 3 is a block diagram of the circuit connections of the AXG VR voltage division detection module in one embodiment;
FIG. 4 is a diagram of a circuit connection configuration of a CORE VR voltage division detection module in one embodiment;
fig. 5 is a circuit connection structure diagram of the ALW _ EN enable module 207 according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following description of the present invention will be made in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model provides a chip start control circuit for start chip. As shown in fig. 1, the chip 100 is provided with an enable pin. The chip start-up control circuit includes an enable start-up module 201. The enable starting module 201 includes a first pull-up resistor and a first pull-down resistor, the first pull-up resistor is connected in series with the first pull-down resistor, the first pull-up resistor is further configured to be connected to a first external input voltage terminal, and the first pull-down resistor is further configured to be connected to ground. As shown in fig. 2, the first pull-up resistor is PR172, the first pull-down resistor is PR168, the first external input voltage terminal is a + VDC terminal, and the enable pin of the chip 100 is ENO. The connection end of the first pull-up resistor and the first pull-down resistor connected in series is connected with the enable pin of the chip, and the first pull-up resistor and the first pull-down resistor connected in series are used for controlling the voltage input by the enable pin to meet a first logic level of the chip. Preferably, the chip is a chip of type RT 8205.
Specifically, the enable pin is a main enable input of a chip with ENO model RT 8205. When the Input voltage Input is in a logic level range, the REF/VREG5/VREG3 pins of the chip are enabled. The Input voltage Input is lower than the logic level, the REF/VREG5/VREG3 pins are disabled. When the + VDC is larger than or equal to 7.5V and smaller than 12V, namely lower than a normal range (+12V to +19V), the chip can normally work by adjusting a pull-up resistor and a pull-down resistor of the master enable Input periphery, namely a first pull-up resistor and a first pull-down resistor of the enable starting module.
The chip starts the control circuit, and the chip is provided with an enabling pin; the chip starting control circuit comprises an enabling starting module, the enabling starting module comprises a first pull-up resistor and a first pull-down resistor, the first pull-up resistor is connected with the first pull-down resistor in series, the first pull-up resistor is also used for being connected with a first external input voltage end, and the second pull-down resistor is also used for being connected with the ground; the first pull-up resistor and the first pull-down resistor which are connected in series are used for controlling the voltage input by the enable pin to meet the first logic level of the chip. Therefore, when the voltage input by the enable pin of the chip does not meet the first logic level corresponding to the enable pin and the chip cannot be started, the voltage input by the enable pin can meet the first logic level of the chip by adjusting the first pull-up resistor and the first pull-down resistor which are connected in series, and the chip is started.
Preferably, the chip is provided with a DVDA pin. As shown in fig. 1, the chip start-up control circuit further includes a first voltage input control module 203, where the first voltage input control module 203 includes a second pull-up resistor and a second pull-down resistor; the second pull-up resistor is connected with the second pull-down resistor in series, the second pull-up resistor is also used for being connected with a second external input voltage end, and the second pull-down resistor is also used for being connected with the ground. The connecting end of the second pull-up resistor connected in series with the second pull-down resistor is connected with a DVDA pin of the chip, and the second pull-up resistor and the second pull-down resistor connected in series are used for controlling the voltage input by the DVDA pin to meet a second logic level of the chip.
For example, an AXG VR partial pressure detection module as shown in fig. 3. Power ready (POR) detection, during start-up, the chip will detect the voltage on the voltage input pin DVDA. When DVDA >1.06V, the chip will recognize the power state of the system to beready (POR ═ high) and wait for an enable command at the EN pin. After POR is high and VEN >0.7V, VCC >4.24V, the chip will enter the startup procedure of CORE and AXG. If the voltage at the DVDA pin is below the low threshold (at which time POR is low), the chip will enter a power down routine and the functionality will be disabled. When the + VDC is larger than or equal to 7.5V and smaller than 12V, namely, the + VDC is lower than a normal range (+12V to +19V), the DVDA input voltage is enabled to be in a logic level range by adjusting a pull-up resistor and a pull-down resistor on the periphery of a DVDA pin, and the chip can work normally. That is, the DVDA input voltage can be within a logic level range by calling the second pull-up resistor and the second pull-down resistor connected in series, and the chip can operate normally.
Preferably, the chip is provided with a DVD pin; the chip start-up control circuit further comprises a second voltage input control module 205, wherein the second voltage input control module 205 comprises a third pull-up resistor and a third pull-down resistor; the third pull-up resistor is connected in series with the third pull-down resistor, the third pull-up resistor is also used for being connected with a third external input voltage end, and the third pull-down resistor is also used for being connected with the ground; the connecting end of the third pull-up resistor and the third pull-down resistor connected in series is connected with the DVD pin of the chip, and the third pull-up resistor and the third pull-down resistor connected in series are used for controlling the voltage input by the DVD pin to meet a third logic level of the chip.
For example, as shown in the CORE VR voltage division detection block of fig. 4, power ready (POR) detection during start-up, the chip will detect the voltage on the voltage input pin DVD. When DVD >1.06V, the chip will recognize the power state of the system to beready (POR high) and wait for an enable command at the EN pin. After POR is high and VEN >0.7V, the chip will enter the startup procedure of CORE. If the voltage at the DVD pin is below a low threshold (POR ═ low), the chip will enter a power down procedure and the functionality will be disabled. When the + VDC is more than or equal to 7.5V and less than 12V, namely lower than the normal range (+12V to +19V), the DVD input voltage is in the logic level range by adjusting the pull-up resistor and the pull-down resistor on the periphery of the DVD module, and the chip can normally work. That is, the DVDA input voltage can be within a logic level range by calling the third pull-up resistor and the third pull-down resistor connected in series, and the chip can normally operate.
Preferably, as shown in fig. 1, the chip start control circuit further includes an ALW _ EN enable module 207, and the RT8205 chip is provided with an ALW _ EN input voltage terminal; the ALW _ EN enabling module 207 includes a fourth pull-up resistor and a fourth pull-down resistor, the fourth pull-up resistor is connected in series with the fourth pull-down resistor, the fourth pull-up resistor is further configured to be connected to a fourth external input voltage terminal, and the fourth pull-down resistor is further configured to be connected to ground; the fourth pull-up resistor and the fourth pull-down resistor are connected in series, a connection end of the fourth pull-up resistor and the fourth pull-down resistor are connected with the ALW _ EN input voltage end, and the fourth pull-up resistor and the fourth pull-down resistor are connected in series and used for controlling the voltage input by the ALW _ EN input voltage end to meet the fourth logic level of the chip.
Preferably, the RT8205 type chip is provided with an 8205_ entry 1 pin and an 8205_ entry 2 pin, and the ALW _ EN input voltage terminal comprises an 8205_ entry 1 pin and an 8205_ entry 2 pin; the fourth pull-up resistor and the fourth pull-down resistor which are connected in series are used for controlling the voltage input by the 8205_ ENTRIP1 pin and the 8205_ ENTRIP2 pin to meet a fourth logic level of the chip.
For example, as shown in fig. 5. When + VDC is greater than or equal to 7.5V and less than 12V, i.e. lower than the normal range (+12V- +19V), the input voltage of the input voltage end of ALW _ EN is in the logic level range by adjusting the fourth pull-up resistor and the fourth pull-down resistor of the ALW _ EN enable module 207, so that the MOSFET is fully turned on, and the 8205_ endrp 1 pin and the 8205_ endrp 2 pin are kept at the logic high level, and the chip can normally operate. As shown in fig. 5, the fourth pull-up resistor is PR334, and the fourth pull-down resistor is PR 332.
The application still provides a PC board, the PC board includes the chip and the aforesaid any item of RT8205 model chip start control circuit, chip start control circuit with the chip of RT8205 model is connected for the start-up of the chip of control RT8205 model.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. A chip starting control circuit is characterized in that the chip starting control circuit is used for starting a chip, and the chip is provided with an enabling pin; the chip starting control circuit comprises an enabling starting module, the enabling starting module comprises a first pull-up resistor and a first pull-down resistor, the first pull-up resistor is connected with the first pull-down resistor in series, the first pull-up resistor is also used for being connected with a first external input voltage end, and the first pull-down resistor is also used for being connected with the ground;
the connection end of the first pull-up resistor and the first pull-down resistor connected in series is connected with the enable pin of the chip, and the first pull-up resistor and the first pull-down resistor connected in series are used for controlling the voltage input by the enable pin to meet a first logic level of the chip.
2. The chip start-up control circuit of claim 1, wherein the chip is a RT8205 model chip.
3. The chip start-up control circuit according to claim 2, wherein the chip is provided with a DVDA pin; the chip starting control circuit also comprises a first voltage input control module, wherein the first voltage input control module comprises a second pull-up resistor and a second pull-down resistor; the second pull-up resistor is connected in series with the second pull-down resistor, the second pull-up resistor is also used for being connected with a second external input voltage end, and the second pull-down resistor is also used for being connected with the ground; the connecting end of the second pull-up resistor connected in series with the second pull-down resistor is connected with a DVDA pin of the chip, and the second pull-up resistor and the second pull-down resistor connected in series are used for controlling the voltage input by the DVDA pin to meet a second logic level of the chip.
4. The chip start-up control circuit according to claim 3, wherein the chip is provided with a DVD pin; the chip starting control circuit also comprises a second voltage input control module, wherein the second voltage input control module comprises a third pull-up resistor and a third pull-down resistor; the third pull-up resistor is connected in series with the third pull-down resistor, the third pull-up resistor is also used for being connected with a third external input voltage end, and the third pull-down resistor is also used for being connected with the ground; the connecting end of the third pull-up resistor and the third pull-down resistor connected in series is connected with the DVD pin of the chip, and the third pull-up resistor and the third pull-down resistor connected in series are used for controlling the voltage input by the DVD pin to meet a third logic level of the chip.
5. The chip start-up control circuit according to claim 2, further comprising an ALW _ EN enable module, wherein the RT8205 chip is provided with an ALW _ EN input voltage terminal; the ALW _ EN enabling module comprises a fourth pull-up resistor and a fourth pull-down resistor, the fourth pull-up resistor is connected with the fourth pull-down resistor in series, the fourth pull-up resistor is further used for being connected with a fourth external input voltage end, and the fourth pull-down resistor is further used for being connected with the ground;
the fourth pull-up resistor and the fourth pull-down resistor are connected in series, a connection end of the fourth pull-up resistor and the fourth pull-down resistor are connected with the ALW _ EN input voltage end, and the fourth pull-up resistor and the fourth pull-down resistor are connected in series and used for controlling the voltage input by the ALW _ EN input voltage end to meet the fourth logic level of the chip.
6. The chip start-up control circuit of claim 5, wherein the RT8205 model chip is provided with 8205_ ENTRIP1 and 8205_ ENTRIP2 pins, and the ALW _ EN input voltage terminal comprises 8205_ ENTRIP1 and 8205_ ENTRIP2 pins; the fourth pull-up resistor and the fourth pull-down resistor which are connected in series are used for controlling the voltage input by the 8205_ ENTRIP1 pin and the 8205_ ENTRIP2 pin to meet a fourth logic level of the chip.
7. A PC board comprising a RT8205 model chip and the chip start control circuit of any one of claims 1-6, connected to the RT8205 model chip for controlling the start of the RT8205 model chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022087444.7U CN213027810U (en) | 2020-09-21 | 2020-09-21 | Chip start control circuit and PC board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022087444.7U CN213027810U (en) | 2020-09-21 | 2020-09-21 | Chip start control circuit and PC board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213027810U true CN213027810U (en) | 2021-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022087444.7U Active CN213027810U (en) | 2020-09-21 | 2020-09-21 | Chip start control circuit and PC board |
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| CN (1) | CN213027810U (en) |
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- 2020-09-21 CN CN202022087444.7U patent/CN213027810U/en active Active
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