Circuit for burning vehicle-mounted SOC without disassembling machine

Abstract

The utility model discloses a circuit for burning a vehicle-mounted SOC (System On Chip) without disassembling in the field of automotive electronics, which comprises an external circuit, the external circuit is connected with a trigger circuit, the trigger circuit is connected with a BOOT mode control circuit, and the BOOT mode control circuit is connected with the SOC. The external circuit inputs a detection signal to the trigger circuit, the trigger circuit sends a trigger signal to the BOOT mode control circuit, and the BOOT mode control circuit sends a control signal to the SOC, so that the SOC is converted from a normal working mode to a burning mode, and software burning upgrading can be carried out. Compared with the prior art, the system does not need to be disassembled and assembled, and the SOC working mode is switched through the input of the external signal, so that the burning and upgrading time is greatly shortened, and the working efficiency in production and debugging is improved.

Description

Technical Field

[0001] The utility model relates to a circuit for burning a vehicle-mounted SOC without disassembling the machine in the technical field of automobile electronics. Background Art

[0002] At present, when burning and upgrading the SOC software version in the early stage of the project, it is necessary to disassemble the host, remove the upper cover, use DuPont wires to ground the BOOT mode control circuit of the SOC in the PCBA through hard wires, so that the SOC enters the burning mode, and then burn and upgrade the software version through the PC. This method requires the preparation of disassembly tools in advance for disassembly, plugging and unplugging of DuPont wires, and reinstallation after the burning and upgrading are completed. The process is relatively cumbersome, especially when the software version needs to be upgraded in batches, disassembly, burning and upgrading, and then reinstalling is even more time-consuming and labor-intensive. Utility Model Content

[0003] The utility model aims to provide a circuit for burning a vehicle-mounted SOC without disassembling the machine, which greatly reduces the burning and upgrading time and improves the work efficiency in production and debugging.

[0004] To achieve the above purpose, the utility model provides a circuit for burning a vehicle-mounted SOC without disassembling the machine, including an external circuit, the external circuit is connected to a trigger circuit, the trigger circuit is connected to a BOOT mode control circuit, and the BOOT mode control circuit is connected to the SOC.

[0005] Compared with the prior art, the utility model has the beneficial effect that the external circuit inputs a detection signal to the trigger circuit, the trigger circuit sends a trigger signal to the BOOT mode control circuit, and the BOOT mode control circuit sends a control signal to the SOC, so that the SOC changes from the normal working mode to the burning mode, and then the software burning upgrade can be performed. There is no need to disassemble and install the machine, and the SOC working mode is switched by inputting an external signal, thereby greatly reducing the burning and upgrading time and improving the work efficiency in production and debugging.

[0006] As a further improvement of the utility model, the external circuit includes an external socket J1, and pins 3 and 7 of the external socket J1 are connected to the external wiring harness. Inside the circuit, pin 3 is connected to the trigger circuit via resistor R12, and pin 7 is connected to the trigger circuit via resistor R91. At the interface, pin 3 is connected to an anti-static bidirectional diode D12 and a capacitor C35, the anti-static bidirectional diode D12 and the capacitor C35 are connected in parallel, and the other end is grounded. Pin 7 is connected to an anti-static bidirectional diode D16 and a capacitor C36, the anti-static bidirectional diode D16 and the capacitor C36 are connected in parallel, and the other end is grounded.

[0007] In this way, when the two input detection pins of the external wiring harness are both grounded, pins 3 and 7 output a detection signal to the trigger circuit. When at least one of the two input detection pins of the external wiring harness is connected to a high level, pins 3 and 7 send another detection signal to the trigger circuit. Two different external detection signals can stimulate two different trigger signals to the trigger circuit.

[0008] As a further improvement of the utility model, the trigger circuit includes a Schmitt trigger U1, the 5th pin of the Schmitt trigger U1 is connected to the 3.3V power supply, the 4th pin of the Schmitt trigger U1 is connected to the BOOT mode control circuit, the 3rd pin of the Schmitt trigger U1 is grounded, the 2nd pin of the Schmitt trigger U1 is connected to one end of the resistor R369, the other end of the resistor R369 is connected to the 7th pin of the external socket, the two ends of the resistor R369 are respectively connected to one end of the capacitor C328 and one end of the capacitor C327, the other end of the capacitor C328 is connected to the other end of the capacitor C327 The first end of the capacitor C328 is connected to the 7th pin of the external socket J1 and is connected to the 3.3V power supply via a resistor R386; the 1st pin of the Schmitt trigger U1 is connected to one end of the resistor R368, the other end of the resistor R368 is connected to the 3rd pin of the external socket, the two ends of the resistor R368 are respectively connected to one end of the capacitor C545 and one end of the capacitor C576, the other end of the capacitor C545 is connected to the other end of the capacitor C576 and is grounded, and one end of the capacitor C545 is connected to the 3rd pin of the external socket J1 and is connected to the 3.3V power supply via a resistor R372.

[0009] Such a trigger circuit is equivalent to a two-input OR gate. When both inputs are low, the output is low. When one of the two inputs is high, the output is high.

[0010] As a further improvement of the present utility model, the BOOT mode control circuit includes a transistor Q3, the emitter of the transistor Q3 is respectively connected to a 1.8V power supply and one end of a resistor R114, the base of the transistor Q3 is respectively connected to the other end of the resistor R114 and one end of the resistor R96, the other end of the resistor R96 is connected to the anode of the diode D24, the cathode of the diode D24 is connected to pin 4 of the Schmitt trigger U1, the collector of the transistor Q3 is connected to one end of the capacitor C38, the other end of the capacitor C38 is connected to one end of the resistor R93 and grounded, the other end of the resistor R93 is respectively connected to one end of the capacitor C38 and one end of the resistor R92, and the other end of the resistor R92 is connected to the H42 pin of the SOC.

[0011] In this way, the BOOT mode control circuit is equivalent to an inverting switch. When the input is low, the output is high, and when the input is high, the output is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1This is a circuit block diagram of the utility model.

[0013] Figure 2 This is the external circuit hardware connection diagram of the utility model.

[0014] Figure 3 This is the hardware connection diagram of the trigger circuit of the utility model.

[0015] Figure 4 This is the BOOT mode control circuit and SOC hardware connection diagram of the utility model. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings:

[0017] like Figure 1-4 The circuit shown is for burning a vehicle-mounted SOC without disassembling the machine, including an external circuit, which is connected to a trigger circuit, which is connected to a BOOT mode control circuit, and which is connected to the SOC.

[0018] The external circuit includes an external socket J1, and pins 3 and 7 of the external socket J1 are connected to the external wiring harness. Inside the circuit, pin 3 is connected to the trigger circuit via resistor R12, and pin 7 is connected to the trigger circuit via resistor R91. At the interface, pin 3 is connected to an anti-static bidirectional diode D12 and a capacitor C35, the anti-static bidirectional diode D12 and the capacitor C35 are connected in parallel, and the other end is grounded. Pin 7 is connected to an anti-static bidirectional diode D16 and a capacitor C36, the anti-static bidirectional diode D16 and the capacitor C36 are connected in parallel, and the other end is grounded.

[0019] The trigger circuit includes a Schmitt trigger U1, wherein the 5th pin of the Schmitt trigger U1 is connected to a 3.3V power supply, the 4th pin of the Schmitt trigger U1 is connected to a BOOT mode control circuit, the 3rd pin of the Schmitt trigger U1 is grounded, the 2nd pin of the Schmitt trigger U1 is connected to one end of a resistor R369, the other end of the resistor R369 is connected to the 7th pin of an external socket, the two ends of the resistor R369 are respectively connected to one end of a capacitor C328 and one end of a capacitor C327, the other end of the capacitor C328 is connected to the other end of the capacitor C327 and is grounded, One end of capacitor C328 is connected to pin 7 of the external socket J1 via resistor R386 and a 3.3V power supply. Pin 1 of Schmitt trigger U1 is connected to one end of resistor R368, the other end of resistor R368 is connected to pin 3 of the external socket, both ends of resistor R368 are respectively connected to one end of capacitor C545 and one end of capacitor C576, the other end of capacitor C545 is connected to the other end of capacitor C576 and grounded, and one end of capacitor C545 is connected to pin 3 of the external socket J1 via resistor R372 and a 3.3V power supply.

[0020] The BOOT mode control circuit includes a transistor Q3, the emitter of which is connected to a 1.8V power supply and one end of a resistor R114 respectively, the base of which is connected to the other end of the resistor R114 and one end of the resistor R96 respectively, the other end of the resistor R96 is connected to the anode of a diode D24, the cathode of the diode D24 is connected to pin 4 of the Schmitt trigger U1, the collector of the transistor Q3 is connected to one end of a capacitor C38, the other end of the capacitor C38 is connected to one end of a resistor R93 and is grounded, the other end of the resistor R93 is connected to one end of the capacitor C38 and one end of the resistor R92 respectively, and the other end of the resistor R92 is connected to pin H42 of the SOC.

[0021] In the utility model, the trigger circuit, the BOOT mode control circuit and the SOC are all arranged in the host, and the external socket J1 is installed on the surface of the host, and the external socket J1 is connected to the external wiring harness.

[0022] The trigger circuit is triggered by a detection signal from an external wiring harness, the output of the trigger circuit is connected to a BOOT mode control circuit, and the control circuit outputs to the SOC.

[0023] The trigger circuit is equivalent to a two-input OR gate. When both inputs are low, the output is low. When one of the two inputs is high or suspended, the output is high. The resistor R368, capacitor C328 and capacitor C327, resistor R372 and 3.3V power supply form an input signal conversion circuit. When the 3-pin input of the external socket J1 is grounded, the 1-pin of U1 is low. When the input is connected to the power supply, the 1-pin of U1 is high 3V3. Similarly, when the 7-pin input of the external socket J1 is grounded, the 7-pin of U1 is low. When the input is connected to the power supply, the 7-pin of U1 is high 3V3.

[0024] The BOOT mode control circuit uses a transistor, a 1.8V power supply and a diode D24 to form an inverting switch. When the output of pin 4 of U1 is low, the output of the BOOT mode control circuit is high. When the input of pin 4 of U1 is high, the output of the BOOT mode control circuit is low.

[0025] The SOC detection pin will enter the USB burning mode only when it detects a high level. If the SOC detects a low level, it will remain in the normal working mode.

[0026] When both detection lines of the external wiring harness are grounded, the trigger circuit or gate outputs a low level to the BOOT mode control circuit, and the BOOT mode control circuit reversely outputs a high level to the SOC, causing it to enter the USB burning mode. At this time, software burning and upgrading can be performed. When at least one of the two detection lines of the external wiring harness is suspended or connected to a high level, the trigger circuit or gate outputs a high level to the BOOT mode control circuit, and the control circuit outputs a low level to the SOC. The SOC continues to work in normal mode and will not enter the burning mode. In order to improve accuracy and prevent false detection, a two-input OR gate is used for detection.

[0027] The utility model can burn and upgrade the SOC software version by directly grounding the detection pin in the external wiring harness outside the host, without disassembling and installing the machine, which greatly reduces the burning and upgrading time and improves the work efficiency in production and debugging.

[0028] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed herein, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. A circuit for burning a vehicle-mounted SOC without disassembling the machine, characterized in that: The external circuit is connected to the trigger circuit, the trigger circuit is connected to the BOOT mode control circuit, and the BOOT mode control circuit is connected to the SOC.

2. According to claim 1, a circuit for burning a vehicle-mounted SOC without disassembling the machine is characterized in that: The external circuit includes an external socket J1, and pins 3 and 7 of the external socket J1 are connected to the external wiring harness. Inside the circuit, pin 3 is connected to the trigger circuit via resistor R12, and pin 7 is connected to the trigger circuit via resistor R91. At the interface, pin 3 is connected to an anti-static bidirectional diode D12 and a capacitor C35, the anti-static bidirectional diode D12 and the capacitor C35 are connected in parallel, and the other end is grounded. Pin 7 is connected to an anti-static bidirectional diode D16 and a capacitor C36, the anti-static bidirectional diode D16 and the capacitor C36 are connected in parallel, and the other end is grounded.

3. According to claim 2, a circuit for burning a vehicle-mounted SOC without disassembling the machine is characterized in that: The trigger circuit includes a Schmitt trigger U1, wherein the 5th pin of the Schmitt trigger U1 is connected to a 3.3V power supply, the 4th pin of the Schmitt trigger U1 is connected to a BOOT mode control circuit, the 3rd pin of the Schmitt trigger U1 is grounded, the 2nd pin of the Schmitt trigger U1 is connected to one end of a resistor R369, the other end of the resistor R369 is connected to the 7th pin of an external socket, the two ends of the resistor R369 are respectively connected to one end of a capacitor C328 and one end of a capacitor C327, the other end of the capacitor C328 is connected to the other end of the capacitor C327 and is grounded, and one end of the capacitor C328 is connected to the 7th pin of the external socket J1 via a resistor R386 and the 3.3V power supply; Pin 1 of the Schmitt trigger U1 is connected to one end of a resistor R368, the other end of the resistor R368 is connected to pin 3 of the external socket, the two ends of the resistor R368 are respectively connected to one end of a capacitor C545 and one end of a capacitor C576, the other end of the capacitor C545 is connected to the other end of the capacitor C576 and grounded, and one end of the capacitor C545 is connected to a 3.3V power supply via a resistor R372.

4. A circuit for burning a vehicle-mounted SOC without disassembling the machine according to claim 3, characterized in that: The BOOT mode control circuit includes a transistor Q3, the emitter of which is connected to a 1.8V power supply and one end of a resistor R114 respectively, the base of which is connected to the other end of the resistor R114 and one end of the resistor R96 respectively, the other end of the resistor R96 is connected to the anode of a diode D24, the cathode of the diode D24 is connected to pin 4 of the Schmitt trigger U1, the collector of the transistor Q3 is connected to one end of a capacitor C38, the other end of the capacitor C38 is connected to one end of a resistor R93 and is grounded, the other end of the resistor R93 is connected to one end of the capacitor C38 and one end of the resistor R92 respectively, and the other end of the resistor R92 is connected to pin H42 of the SOC.

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