Type-c interface insertion detection circuit with pre-wakeup function

Abstract

The application relates to a Type-C interface insertion detection circuit with a pre-waking function, which comprises a Type-C interface detection circuit, including a charging equipment end and a mobile phone end interface detection circuit; and a Type-C interface pre-waking circuit, including a charging equipment end and a mobile phone end interface pre-waking circuit; wherein the charging equipment end interface detection circuit comprises a P-type switch tube M2, an upper pull current source Irp and a comparator P; the mobile phone end interface detection circuit comprises an N-type switch tube M1, a pull-down resistor Rd and a comparator D; the charging equipment end interface pre-waking circuit comprises a P-type switch tube M3, an upper pull resistor Rp_Pre, a P-type switch tube M4, a resistor R1, a resistor R2 and an inverter PI1; the mobile phone end interface pre-waking circuit multiplexes M1 and Rd, and further comprises an N-type switch tube M5, a resistor R3, a resistor R4 and an inverter PI2. The application has a simple circuit structure, adopts a pre-waking circuit strategy, realizes an interface insertion pre-detection function with zero standby power consumption, and greatly prolongs the endurance time of a charging equipment and a mobile phone battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of integrated circuits, and particularly relates to a Type-C interface insertion detection circuit with a pre-wakeup function. BACKGROUND

[0002] In the application of integrated circuits, especially the Type-C interface circuit application of mobile phones or charging devices, in order to reduce the standby power consumption of the system, the whole system will enter the sleep mode when the mobile phone or the charging device is not detected to be inserted. However, in order to quickly respond to the insertion of the mobile phone or the charging device, the Type-C interface detection circuit needs to work all the time when sleeping, which greatly increases the standby current of the system when sleeping, thereby greatly shortening the battery life. SUMMARY

[0003] The present application aims to provide a Type-C interface insertion detection circuit with a pre-wakeup function, so as to solve the contradiction between Type-C interface insertion detection and low power consumption through a simple circuit structure.

[0004] To achieve the above-mentioned purpose, the present application provides the following scheme:

[0005] A Type-C interface insertion detection circuit with a pre-wakeup function, comprising: a Type-C interface detection circuit and a Type-C interface pre-wakeup circuit; the Type-C interface detection circuit comprises a charging device end interface detection circuit and a mobile phone end interface detection circuit; the charging device end interface detection circuit comprises a P-type switch tube M2, an upper pull current source Irp and a comparator P; the mobile phone end interface detection circuit comprises an N-type switch tube M1, a pull-down resistor Rd and a comparator D; the Type-C interface pre-wakeup circuit comprises a charging device end interface pre-wakeup circuit and a mobile phone end interface pre-wakeup circuit;

[0006] The charging device end interface pre-waking circuit includes a P-type switch tube M3, an upper pull resistor Rp_Pre, a P-type switch tube M4, a resistor R1, a resistor R2, and an inverter PI1; wherein the source end of the P-type switch tube M3 is connected to a power supply voltage VDD, the gate end of the P-type switch tube M3 is connected to a control signal EN_Rp_Pre, the drain end of the P-type switch tube M3 is connected to one end of the upper pull resistor Rp_Pre, the other end of the upper pull resistor Rp_Pre is connected to a pin CC of the Type-C interface detection circuit; the gate end of the P-type switch tube M4 is connected to the pin CC through the resistor R2, the source end of the P-type switch tube M4 is connected to the power supply voltage VDD, and the drain end of the P-type switch tube M4 is connected to one end of the resistor R1 and the enable end of the comparator P, respectively; the drain end of the P-type switch tube M4 is also connected to the source end of the P-type switch tube M2 through the inverter PI1; the other end of the resistor R1 is grounded;

[0007] The mobile phone end interface pre-waking circuit multiplexes the N-type switch tube M1 and the pull-down resistor Rd of the mobile phone end interface detection circuit, and further includes an N-type switch tube M5, a resistor R3, a resistor R4, and an inverter PI2; wherein the source end of the N-type switch tube M1 is grounded, the gate end of the N-type switch tube M1 is connected to a control signal EN_Rd, the drain end of the N-type switch tube M1 is connected to one end of the pull-down resistor Rd, and the other end of the pull-down resistor Rd is connected to the pin CC; the gate end of the N-type switch tube M5 is connected to the pin CC through the resistor R4, the source end of the N-type switch tube M5 is grounded, the drain end of the N-type switch tube M5 is connected to one end of the resistor R3 and the input end of the inverter PI2; and the other end of the resistor R3 is connected to a power supply voltage VDD.

[0008] Optionally, in the charging device end interface detection circuit, the source end of the P-type switch tube M2 is connected to a power supply voltage VDD, the gate end of the P-type switch tube M2 is connected to a control signal EN_Rp, and the drain end of the P-type switch tube M2 is connected to the source end of the upper pull current source Irp; the output end of the upper pull current source Irp is connected to the pin CC; the reverse end of the comparator P is connected to the pin CC, the same direction end of the comparator P is connected to a reference voltage VREF, and the output voltage of the comparator P is CC_DET_P.

[0009] Optionally, in the mobile phone end interface detection circuit, the same direction end of the comparator D is connected to the pin CC, the reverse end of the comparator D is connected to a reference voltage VREF, and the output voltage of the comparator D is CC_DET_D.

[0010] Optionally, when the Type-C interface at the charging device end is dormant, the gate end control signal EN_Rp_Pre of the P-type switch tube M3 is 0, and the gate end control signal EN_Rp of the P-type switch tube M2 is 1.

[0011] Optionally, when the Type-C interface at the mobile phone end is dormant, the gate end control signal EN_Rd of the N-type switch tube M1 is 1.

[0012] Optionally, the voltage signal at the connection point of the drain end of the P-type switch tube M4 and the resistor R1 is CC_DET_P_PRE.

[0013] Optionally, the voltage signal at the connection point of the drain end of the N-type switch tube M5 and the resistor R3 is CC_DET_D_PRE_Z.

[0014] Optionally, the output voltage of the inverter PI2 is CC_DET_D_PRE.

[0015] According to the specific embodiments of the present application, the following technical effects are provided.

[0016] The present application provides a Type-C interface insertion detection circuit with a pre-wakeup function, comprising: a Type-C interface detection circuit and a Type-C interface pre-wakeup circuit; the Type-C interface detection circuit comprises a charging device end interface detection circuit and a mobile phone end interface detection circuit; the charging device end interface detection circuit comprises a P-type switch tube M2, a pull-up current source Irp and a comparator P; the mobile phone end interface detection circuit comprises an N-type switch tube M1, a pull-down resistor Rd and a comparator D; the Type-C interface pre-wakeup circuit comprises a charging device end interface pre-wakeup circuit and a mobile phone end interface pre-wakeup circuit; the charging device end interface pre-wakeup circuit comprises a P-type switch tube M3, a pull-up resistor Rp_Pre, a P-type switch tube M4, a resistor R1, a resistor R2 and an inverter PI1; the mobile phone end interface pre-wakeup circuit multiplexes the N-type switch tube M1 and the pull-down resistor Rd of the mobile phone end interface detection circuit, and further comprises an N-type switch tube M5, a resistor R3, a resistor R4 and an inverter PI2. The Type-C interface insertion detection circuit of the present application has a simple circuit structure, adopts a pre-wakeup circuit strategy, and realizes an interface insertion pre-detection function with zero standby power consumption, thereby greatly prolonging the endurance time of the charging device and the mobile phone battery. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0018] Figure 1 The structure schematic diagram of the Type-C interface detection circuit provided by the embodiment of the present application and arranged on the charging device end and the mobile phone end is connected through a Type-C data line.

[0019] Figure 2 The circuit connection schematic diagram of the Type-C interface detection circuit provided by the embodiment of the present application.

[0020] Figure 3 The circuit connection schematic diagram of the Type-C interface insertion detection circuit with pre-wakeup function provided by the embodiment of the present application.

[0021] Figure 4 The structure schematic diagram of the Type-C interface insertion detection circuit provided by the embodiment of the present application and arranged on the charging device end and the mobile phone end is connected through a Type-C data line. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0023] The purpose of the present application is to provide a Type-C interface insertion detection circuit with pre-wakeup function, so as to solve the contradiction between Type-C interface insertion detection and low power consumption through a simple circuit structure.

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0025] Figure 1 The structure schematic diagram of the Type-C interface detection circuit provided by the embodiment of the present application and arranged on the charging device end and the mobile phone end is connected through a Type-C data line. Referring to Figure 1, in the application of the Type-C interface circuit of a mobile phone or a charging device (such as an adapter, a power bank, etc.), in order to quickly respond to the insertion of the mobile phone or the charging device, the Type-C interface detection circuit needs to work continuously during sleep, which greatly increases the standby current during system sleep, thus greatly shortening the battery life of the mobile phone or the charging device.

[0026] In a mobile phone or a charging device, the Type-C interface detection circuit is as Figure 2 shown. On the charging device side, the source (also called the source electrode) of the P-type switching transistor M2 is connected to the power supply VDD, the gate (also called the gate electrode) is connected to the control signal EN_Rp, the drain (also called the drain electrode) is connected to the source of the pull-up current source Irp, the output end of Irp is connected to the pin CC, and the pin CC is simultaneously connected to the inverting end of the detection comparator P. The non-inverting end of the comparator P is connected to the reference voltage VREF, and the output signal of the comparator P is CC_DET_P. On the mobile phone side, the source of the N-type switching transistor M1 is connected to GND (i.e., grounded), the gate is connected to the control signal EN_Rd, the drain is connected to one end of the pull-down resistor Rd, the other end of the pull-down resistor Rd is connected to the pin CC, the pin CC is simultaneously connected to the non-inverting end of the detection comparator D, the inverting end of the comparator D is connected to the reference voltage VREF, and the output voltage of the comparator D is CC_DET_D.

[0027] In the charging device side interface, by controlling the gate voltage EN_Rp = 0 of the switching transistor M2, the switching transistor M2 is always in the working state to continuously detect whether there is a pull-down resistor inserted into the CC pin in the Type-C interface. If there is no pull-down resistor inserted, the level of the CC pin will be pulled up to the VDD level by the current source Irp, which is greater than the VREF reference voltage, and the comparator P outputs CC_DET_P as a low level. If there is a pull-down resistor (such as Figure 2 the pull-down resistor Rd in) inserted, by controlling the gate voltage EN_Rd = 1 of the switching transistor M1, the switching transistor M1 is in the working state. At this time, the voltage V cc = I rp *R d < VREF, and the comparator outputs CC_DET_P as a high level, where I rp represents the current flowing through the pull-up current source Irp, and R d represents the resistance value of the pull-down resistor Rd.

[0028] In the mobile phone interface, by controlling the gate voltage EN_Rd=1 of the switch tube M1, the switch tube M1 is always in working state, and whether the CC pin in the Type-C interface has a pull-up current source inserted is detected in real time. If there is no pull-up current source inserted, the CC pin level will be pulled down to the GND level by the pull-down resistor Rd, which is less than the reference voltage VREF, and the comparator D output CC_DET_D is low; if there is a pull-up current source inserted, the voltage on the CC pin is I rp *R d >VREF, and the comparator output CC_DET_D is high.

[0029] The application mainly reduces the system standby power consumption by adding a pre-wakeup circuit to the Type-C interface detection circuit, and closing the Type-C interface detection circuit in sleep mode. When the device is inserted, the pre-wakeup circuit is triggered, and then the Type-C interface detection circuit is enabled, so that the insertion of the device is quickly responded.

[0030] Figure 3 The circuit connection schematic diagram of the Type-C interface insertion detection circuit with pre-wakeup function provided by the embodiment of the application is shown in Figure 3 , the Type-C interface insertion detection circuit with pre-wakeup function includes a Type-C interface detection circuit and a Type-C interface pre-wakeup circuit. The Type-C interface detection circuit includes a charging device end interface detection circuit and a mobile phone end interface detection circuit. The Type-C interface pre-wakeup circuit includes a charging device end interface pre-wakeup circuit and a mobile phone end interface pre-wakeup circuit.

[0031] Specifically, referring to Figure 3 , the charging device end interface detection circuit includes a P-type switch tube M2, a pull-up current source Irp and a comparator P; the mobile phone end interface detection circuit includes an N-type switch tube M1, a pull-down resistor Rd and a comparator D; the charging device end interface pre-wakeup circuit includes a P-type switch tube M3, a pull-up resistor Rp_Pre, a P-type switch tube M4, a resistor R1, a resistor R2 and an inverter PI1; the mobile phone end interface pre-wakeup circuit multiplexes the N-type switch tube M1 and the pull-down resistor Rd of the mobile phone end interface detection circuit, and the mobile phone end interface pre-wakeup circuit further includes an N-type switch tube M5, a resistor R3, a resistor R4 and an inverter PI2.

[0032] In the pre-wake-up circuit of the interface of the charging device, the source end of the P-type switch tube M3 is connected with the power supply voltage VDD, the gate end of the P-type switch tube M3 is connected with the control signal EN_Rp_Pre, the drain end of the P-type switch tube M3 is connected with one end of the pull-up resistor Rp_Pre, the other end of the pull-up resistor Rp_Pre is connected to the pin CC of the Type-C interface detection circuit; the gate end of the P-type switch tube M4 is connected to the pin CC through the resistor R2, the source end of the P-type switch tube M4 is connected with the power supply voltage VDD, and the drain end of the P-type switch tube M4 is connected with one end of the resistor R1 and the enable end of the comparator P respectively; the drain end of the P-type switch tube M4 is also connected to the source end of the P-type switch tube M2 through the inverter PI1; the other end of the resistor R1 is grounded.

[0033] In the pre-wake-up circuit of the interface of the mobile phone, the source end of the N-type switch tube M1 is grounded, the gate end of the N-type switch tube M1 is connected with the control signal EN_Rd, the drain end of the N-type switch tube M1 is connected with one end of the pull-down resistor Rd, the other end of the pull-down resistor Rd is connected to the pin CC; the gate end of the N-type switch tube M5 is connected to the pin CC through the resistor R4, the source end of the N-type switch tube M5 is grounded, and the drain end of the N-type switch tube M5 is connected with one end of the resistor R3 and the input end of the inverter PI2; the other end of the resistor R3 is connected with the power supply voltage VDD.

[0034] In the interface detection circuit of the charging device, the source end of the P-type switch tube M2 is connected with the power supply voltage VDD, the gate end of the P-type switch tube M2 is connected with the control signal EN_Rp, and the drain end of the P-type switch tube M2 is connected with the source end of the pull-up current source Irp; the output end of the pull-up current source Irp is connected to the pin CC; the reverse end of the comparator P is connected to the pin CC, the same direction end of the comparator P is connected with the reference voltage VREF, and the output voltage of the comparator P is CC_DET_P.

[0035] In the interface detection circuit of the mobile phone, the same direction end of the comparator D is connected to the pin CC, the reverse end of the comparator D is connected with the reference voltage VREF, and the output voltage of the comparator D is CC_DET_D.

[0036] When the Type-C interface of the charging device end is in sleep state, the gate end control signal EN_Rp_Pre of the P-type switch tube M3 is 0, and the gate end control signal EN_Rp of the P-type switch tube M2 is 1. When the Type-C interface of the mobile phone end is in sleep state, the gate end control signal EN_Rd of the N-type switch tube M1 is 1. The voltage signal at the connection point of the drain end of the P-type switch tube M4 and the resistor R1 is CC_DET_P_PRE. The voltage signal at the connection point of the drain end of the N-type switch tube M5 and the resistor R3 is CC_DET_D_PRE_Z. The output voltage of the inverter PI2 is CC_DET_D_PRE.

[0037] Figure 4 The Type-C interface insertion detection circuit provided by the embodiment of the present application is arranged on the charging device end and the mobile phone end, and the structure schematic diagram of the Type-C interface insertion detection circuit is connected through the Type-C data line. Referring to Figure 3 and Figure 4 , the Type-C interface pre-wakeup circuit (referred to as pre-wakeup circuit) is added on the basis of the Type-C interface detection circuit. In the charging device end, the source end of the P-type switch tube M3 is connected to the power supply voltage VDD, the gate end is connected to the control signal EN_Rp_Pre, and the drain end is connected to one end of the pull-up resistor Rp_Pre. The other end of the pull-up resistor Rp_Pre is connected to the CC pin. At the same time, the CC pin is connected to the gate end control signal of the P-type switch tube M4 through the resistor R2, the source end of M4 is connected to the power supply voltage VDD, and the drain end is connected to one end of the resistor R1. The voltage signal of this node is CC_DET_P_PRE, and then the signal CC_DET_P_PRE is connected to the enable end of the comparator P and the gate end of M3 as the control signal EN_Rp_Pre. The signal is also connected to the gate end of the P-type switch tube M2 through the inverter PI1 as the control signal EN_Rp. The other end of the resistor R1 is connected to GND. In the mobile phone end, the source end of the N-type switch tube M1 is connected to GND, the gate end is connected to the control signal EN_Rd, and the drain end is connected to one end of the pull-down resistor Rd. The other end of the pull-down resistor Rd is connected to the pin CC. The pin CC is connected to the gate end control signal of the N-type switch tube M5 through the resistor R4, the source end of M5 is connected to GND, and the drain end is connected to one end of the resistor R3. The voltage signal of this node is CC_DET_D_PRE_Z, and then the signal CC_DET_D_PRE_Z is connected to the input end of the inverter PI2. The output of the inverter PI2 is CC_DET_D_PRE, and the signal CC_DET_D_PRE is connected to the enable end of the comparator D. The other end of the resistor R3 is connected to the power supply voltage VDD.

[0038] Referring to Figure 3 , the working principle of the Type-C interface insertion detection circuit with pre-wakeup function is as follows.

[0039] At the charging device end, the pull-up function is realized by the switch tube M3 and the pull-up resistor Rp_Pre (whose resistance is R p _Pre), and the Rd insertion pre-wakeup function is realized by the switch tube M4, the resistor R1 and R2. When the Type-C interface of the charging device is in sleep state, the gate control voltage of the switch tube M3 is EN_Rp_Pre = 0, the gate control voltage of the switch tube M2 is EN_Rp = 1, the Irp pull-up current source is closed, and the comparator P is in the off state. When the pin CC is not inserted with a pull-down resistor, the CC pin is pulled up to the VDD voltage by the Rp_pre, the M4 switch tube is in the off state, the output CC_DET_P_PRE is pulled down to the GND by the resistor R1, the whole Type-C interface circuit has no working current, and the system power consumption is very low. When the pin CC is inserted with a pull-down resistor, the voltage of the CC pin is VDD*R d / (R p _Pre+R d ), which is connected to the gate of the M4 through the ESD protection resistor R2, the M4 switch tube is opened, the output CC_DET_P_PRE is pulled up, the signal CC_DET_P_PRE enables the switch tube M2 and the comparator P, then the M3 will be closed, and the Type-C interface detection circuit will start to work.

[0040] At the mobile phone end, the pull-down resistor part will be multiplexed with the interface detection circuit part, and the switch tube M5, the resistor R3 and R4 realize the pull-up insertion pre-wakeup function. When the interface of the mobile phone is in sleep state, the gate control voltage of the switch tube M1 is EN_Rd = 1, M1 is opened, the pull-down is realized through the resistor Rd, and the comparator D is in the off state. When the pin CC is not inserted with a pull-up, the CC pin is pulled down to the GND by the Rd and M1, the CC pin is connected to the gate of the switch tube M5 through the ESD protection resistor R4, M5 is in the off state, the output CC_DET_D_PRE_Z is pulled up to the VDD by the resistor R3, then through the inverter, the output CC_DET_D_PRE is low, the whole Type-C interface circuit has no working current, and the system power consumption is very low. When the pin CC is inserted with a pull-up, the voltage of the CC pin is VDD*R d / (R p _Pre+R d ), which is the gate voltage of the switch tube M5, M5 is opened, the CC_DET_D_PRE_Z signal is pulled down, the output CC_DET_D_PRE is high, the pull-up insertion pre-wakeup is realized, then the comparator D is opened, and the Type-C interface detection circuit will start to work.

[0041] Therefore, the application can realize the interface insertion detection function while reducing the system standby power consumption by increasing the Type-C interface pre-waking circuit, closing the Type-C interface detection circuit when the interface circuit is in sleep, and solving the contradiction between the Type-C interface insertion detection and low power consumption through a simple circuit structure.

[0042] The various embodiments are described in a progressive manner in the specification, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

[0043] The principles and implementation manners of the application are described by using specific examples in the specification, and the above description of the examples is only used to help understand the method and core idea of the application; meanwhile, for the general technical personnel in the field, the specific implementation manners and application range will be changed according to the idea of the application. In conclusion, the content of the specification should not be understood as the limitation of the application.

Claims

1. A Type-C interface insertion detection circuit with pre-wakeup function, characterized in that, The application relates to a Type-C interface detection circuit and a Type-C interface pre-waking circuit. The source end of the P-type switch tube M2 is connected with a power supply voltage VDD, the gate end of the P-type switch tube M2 is connected with a control signal EN_Rp, and the drain end of the P-type switch tube M2 is connected with the source end of the pull-up current source Irp; the output end of the pull-up current source Irp is connected to a pin CC; the reverse end of the comparator P is connected to the pin CC, the same direction end of the comparator P is connected with a reference voltage VREF, and the output voltage of the comparator P is CC_DET_P. The same direction end of the comparator D is connected to the pin CC, the reverse end of the comparator D is connected with the reference voltage VREF, and the output voltage of the comparator D is CC_DET_D. The source end of the P-type switch tube M3 is connected with the power supply voltage VDD, the gate end of the P-type switch tube M3 is connected with the control signal EN_Rp_Pre, the drain end of the P-type switch tube M3 is connected with one end of the pull-up resistor Rp_Pre, the other end of the pull-up resistor Rp_Pre is connected to the pin CC of the Type-C interface detection circuit; the gate end of the P-type switch tube M4 is connected to the pin CC through the resistor R2, the source end of the P-type switch tube M4 is connected with the power supply voltage VDD, and the drain end of the P-type switch tube M4 is connected with one end of the resistor R1 and the enable end of the comparator P respectively; the drain end of the P-type switch tube M4 is also connected to the source end of the P-type switch tube M2 through the inverter PI1; the other end of the resistor R1 is grounded. ​ The mobile terminal interface pre-waking circuit multiplexes the N-type switch tube M1 and the pull-down resistor Rd of the mobile terminal interface detection circuit, and further comprises an N-type switch tube M5, a resistor R3, a resistor R4 and an inverter PI2; wherein the source end of the N-type switch tube M1 is grounded, the gate end of the N-type switch tube M1 is connected with a control signal EN_Rd, the drain end of the N-type switch tube M1 is connected with one end of the pull-down resistor Rd, and the other end of the pull-down resistor Rd is connected to the pin CC; the gate end of the N-type switch tube M5 is connected to the pin CC through the resistor R4, the source end of the N-type switch tube M5 is grounded, the drain end of the N-type switch tube M5 is connected with one end of the resistor R3 and the input end of the inverter PI2; and the other end of the resistor R3 is connected with a power supply voltage VDD.

2. The Type-C interface insertion detection circuit of claim 1, wherein, When the Type-C interface of the charging device side is in sleep state, the gate end control signal EN_Rp_Pre of the P-type switch tube M3 is 0, and the gate end control signal EN_Rp of the P-type switch tube M2 is 1.

3. The Type-C interface insertion detection circuit of claim 1, wherein, When the Type-C interface of the mobile terminal side is in sleep state, the gate end control signal EN_Rd of the N-type switch tube M1 is 1.

4. The Type-C interface insertion detection circuit of claim 1, wherein, The voltage signal at the connection point between the drain end of the P-type switch tube M4 and the resistor R1 is CC_DET_P_PRE.

5. The Type-C interface insertion detection circuit of claim 1, wherein, The voltage signal at the connection point between the drain end of the N-type switch tube M5 and the resistor R3 is CC_DET_D_PRE_Z.

6. The Type-C interface insertion detection circuit of claim 1, wherein, The output voltage of the inverter PI2 is CC_DET_D_PRE.

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