SD card power supply protection circuit

Abstract

The utility model discloses an SD card power supply protection circuit, comprising a power supply enabling module and a power supply output module, an SD card is connected with an MCU, an input end of the power supply enabling module is connected with the MCU, an output end of the power supply enabling module is connected with an enabling pin of the power supply output module, and an output end of the power supply output module is connected with a power supply end of the SD card; according to the SD card power supply protection circuit, the power supply output module is enabled and controlled through the power supply enabling module, and the power supply enabling module is connected with and controls the enabled output through the MCU, so that the SD card is controlled when being powered on, and the SD card is ensured to be stably powered on and work.

Description

Technical Field

[0001] The utility model relates to the technical field of SD card power protection, in particular to an SD card power protection circuit. Background Art

[0002] During the control and use of SD cards, they are often plugged in and out while powered on. In this case, overcurrent may occur in the SD power supply. At the same time, surge current may also occur during the plugging and unplugging process. These problems may cause damage to the SD card. Utility Model Content

[0003] Based on the technical problems existing in the background technology, the utility model proposes an SD card power protection circuit to ensure stable power-on operation of the SD card.

[0004] The utility model provides an SD card power protection circuit, comprising a power enabling module and a power output module. The SD card is connected to the MCU, the input end of the power enabling module is connected to the MCU, the output end is connected to the enabling pin of the power output module, and the output end of the power output module is connected to the power end of the SD card.

[0005] Furthermore, the power enable module includes an enable signal RESETSTATz, a resistor R1, a capacitor C1, and a gate U2. The enable signal RESETSTATz is controlled by the MCU and connected to port B of the gate U2. Port A of the gate U2 is connected to an external power supply through a resistor R1. The output end of the gate U2 is connected to the enable pin of the power output module.

[0006] Furthermore, the VCC pin of the gate U2 is first connected to the capacitor C1 and then to the external power supply.

[0007] Furthermore, the power output module includes a power supply U1, a resistor R2 and a capacitor C2, the EN pin of the power supply U1 is connected to the output end of the gate U2, the ISET pin of the power supply U1 is connected to GND through the resistor R2, and the OUT pin of the power supply U1 is connected to GND through the capacitor C2 and connected to the power port of the SD card.

[0008] Furthermore, the power supply U1 adopts a SY6280D chip.

[0009] Furthermore, the SD card is inserted into the J1 socket and a signal is fed back to the MCU via MMC1_SDCD.

[0010] The advantage of an SD card power protection circuit provided by the utility model is that: in the SD card power protection circuit provided in the utility model structure, a power output module is enabled and controlled by a power enable module, and the power enable module is connected to control the enabled output through an MCU, so that control is performed when the SD card is powered on, thereby ensuring stable power-on operation of the SD card. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the structure of the SD card;

[0013] Among them, 1-power enable module, 2-power output module. DETAILED DESCRIPTION

[0014] Below, the technical solution of the utility model is described in detail through specific embodiments. Many specific details are described in the following description to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without violating the connotation of the utility model. Therefore, the utility model is not limited by the specific implementation disclosed below.

[0015] like Figure 1 and 2 As shown, the utility model proposes an SD card power protection circuit: including a power enable module 1 and a power output module 2, the SD card is connected to the MCU, the input end of the power enable module 1 is connected to the MCU, the output end is connected to the enable pin of the power output module 2, and the output end of the power output module 2 is connected to the power end of the SD card.

[0016] The power output module 2 is enabled and controlled by the power enable module 1, and the power enable module 1 controls the enabled output through the MCU connection, so that control is performed when the SD card is powered on, ensuring that the SD card is powered on stably.

[0017] In this embodiment, the power enable module 1 includes an enable signal RESETSTATz, a resistor R1, a capacitor C1, and a gate U2. U2 is an AND gate and has the function of delaying power-on. The enable signal RESETSTATz is controlled by the MCU and connected to the B port of the gate U2. The A port of the gate U2 is connected to the external power supply through the resistor R1. The output end of the gate U2 is connected to the enable pin of the power output module 2. The VCC pin of the gate U2 is connected to the external power supply through the capacitor C1.

[0018] When the enable signal RESETSTATz and the power supply 3V3 (external power supply) work at the same time, the power supply 3V3_SD (the power supply end of the SD card) will be powered on, thereby achieving the delayed power-on requirement of powering on the MCU first and then the SD card, protecting the SD card.

[0019] In this embodiment, the power output module 2 includes a power supply U1, a resistor R2 and a capacitor C2. The EN pin of the power supply U1 is connected to the output end of the gate U2, the ISET pin of the power supply U1 is connected to the GND through the resistor R2, the OUT pin of the power supply U1 is connected to the GND through the capacitor C2, and is connected to the power port of the SD card. The power supply U1 adopts SY6280D. The output current of the power supply U1 is determined by the resistor R2. Changing the value of the resistor R2 can set the output current of the power supply U1. U1 is a power chip, which converts the power supply 3V3 (external power supply) into 3V3_SD (the power supply end of the SD card), thereby performing power-on protection on the SD card.

[0020] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An SD card power protection circuit, characterized in that: The invention comprises a power enabling module (1) and a power output module (2), wherein the SD card is connected to the MCU, the input end of the power enabling module (1) is connected to the MCU, the output end is connected to the enabling pin of the power output module (2), and the output end of the power output module (2) is connected to the power end of the SD card.

2. The SD card power protection circuit according to claim 1, characterized in that: The power enable module (1) comprises an enable signal RESETSTATz, a resistor R1, and a gate U2. The enable signal RESETSTATz is controlled by an MCU and connected to port B of the gate U2. Port A of the gate U2 is connected to an external power supply via the resistor R1. The output end of the gate U2 is connected to the enable pin of the power output module (2).

3. The SD card power protection circuit according to claim 2, characterized in that: The VCC pin of gate U2 is first connected to capacitor C1 and then to an external power supply.

4. The SD card power protection circuit according to claim 2, characterized in that: The power output module (2) comprises a power supply U1, a resistor R2 and a capacitor C2, wherein the EN pin of the power supply U1 is connected to the output end of the gate U2, the ISET pin of the power supply U1 is connected to GND via the resistor R2, and the OUT pin of the power supply U1 is connected to GND via the capacitor C2 and is connected to the power port of the SD card.

5. The SD card power protection circuit according to claim 4, characterized in that: The power supply U1 adopts SY6280D chip.

6. The SD card power protection circuit according to claim 1, characterized in that: The SD card is inserted into the J1 socket and the signal is fed back to the MCU through MMC1_SDCD.

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