I2C (inter-integrated circuit) bus detection device

[0017] Please refer to figure 1 and figure 2 , the preferred embodiment of the I2C bus detection device of the present invention includes a casing 10, a connector 20 connected to the casing 10, a display interface 30 such as a VGA interface disposed on the casing 10, and a setting A detection circuit 40 inside the casing 10 and connected with the connector 20 and the display interface 30 . The connector 20 is used to connect the connector of the I2C bus to be detected on the main board of an electronic device, and the connector 20 includes a clock pin SCL and a data pin SDA, which are respectively used to connect the clock signal lines on the I2C bus. and a data signal line to receive the clock signal and data signal thereon, the display interface 30 is used to connect a display device to display the detection result processed by the detection circuit 40, so that the detection personnel can accurately Be aware of a problem with the motherboard of an electronic device.

[0018] In other embodiments, the housing 10 can also be a circuit board or other carrier that can be provided with circuits, and the connector 20 can also be other structures that can collect signals, such as a probe structure. The probe can be in contact with the clock signal line and the data signal line on the I2C bus. The display interface 30 can be other types of interfaces, and the above designs can be adjusted as required, and are not limited to this embodiment.

[0019] The detection circuit 40 includes two D flip-flops 41 and 42 , an inverter 43 , a microcontroller 44 and a memory 45 . The flip-flops 41 and 42 respectively receive the clock signal output by the clock pin SCL of the connector 20 and the data signal output by the data pin SDA, and output a trigger signal to the corresponding trigger signal according to the clock signal and the data signal. The microcontroller 44, so that the microcontroller 44 enables the corresponding interrupt and captures the clock signal and data signal on the I2C bus, and stores the clock signal and data signal in the memory 45 and through the The display interface 30 is displayed on the display device.

[0020] The clock pin SCL of the connector 20 is respectively connected to the clear pin CLR of the flip-flops 41 and 42 and the third interrupt pin INT3 of the microcontroller 44, and the data pin SDA of the connector 20 is respectively connected to the trigger pin INT3. The clock pin CLK of the controller 41, the input pin INPUT of the microcontroller 44 and the input end of the inverter 43, the output end of the inverter 43 is connected to the clock pin CLK of the flip-flop 42 , the output Q of the flip-flop 41 is connected to the first interrupt pin INT1 of the microcontroller 44, the output Q of the flip-flop 42 is connected to the second interrupt pin INT2 of the microcontroller 44, so The two input and output pins I/O of the microcontroller 44 are respectively connected to the memory 45 and the display interface 30 respectively.

[0021] During operation, the connector 20 is connected to the corresponding connector of the I2C bus to be collected, and the microcontroller 44 is connected to the display device through the display interface 30 . When the clock signal output by the clock pin SCL of the connector 20 is at a high level, and the data signal output by the data pin SDA of the connector 20 does not change, the flip-flops 41 and 42 do not work, so the The third interrupt pin INT3 of the microcontroller 44 receives the high-level signal and enables interruption, and the microcontroller 44 captures the data signal on the I2C bus through the input pin INPUT and stores it in the memory 45 and displayed on the display device through the display interface 30; when the data signal output by the data pin SDA of the connector 20 is at the falling edge, the clock pin of the flip-flop 41 CLK does not work after receiving the falling edge signal, the inverter 43 inverts the falling edge signal to a rising edge signal and supplies it to the clock pin CLK of the flip-flop 42 to make the flip-flop 42 work, so The second interrupt pin INT2 of the microcontroller 44 receives the rising edge signal output by the output end Q of the flip-flop 42 and enables interruption, and the microcontroller 44 captures the start state in the data signal on the I2C bus. The signal is stored in the memory 45 and displayed on the display device through the display interface 30; when the data signal output by the data pin SDA of the connector 20 is on a rising edge, the inversion The controller 43 inverts the rising edge signal to a falling edge signal and provides it to the clock pin CLK of the flip-flop 42, and the clock pin CLK of the flip-flop 42 does not work after receiving the falling edge signal, and the flip-flop 42 does not work. The clock pin CLK of 41 receives the rising edge signal to work, and the first interrupt pin INT1 of the microcontroller 44 receives the rising edge signal output by the output end Q of the flip-flop 41 to enable interrupting. The microcontroller 44 captures the stop state signal in the data signal on the I2C bus and stores it in the memory 45 and displays it on the display device through the display interface 30 . The tester can accurately know the problems existing on the main board of the electronic device according to the detection result displayed on the display device, so as to quickly and accurately complete the debugging or debugging of the electronic device.

[0022] The I2C bus detection device of the present invention receives the clock signal and data signal output by the I2C bus to be tested through the first and second flip-flops 41 and 42, and outputs a trigger signal to the Microcontroller 44, so that the microcontroller 44 enables the corresponding interrupt and captures the clock signal and data signal on the I2C bus, and stores the clock signal and data signal in the memory 43 and displays them in the same on the display device connected to the display interface 30 . The I2C bus detection device can automatically detect the I2C bus on the main board of the electronic equipment, and display the detection result to the tester through the display device, thereby avoiding the debugging caused by human negligence in the process of measuring the signal. or debug errors. The I2C bus detection device has a simple circuit structure and low cost.