Please help me look at this circuit, I can't tell which side is the input and output

pqa

Please help me look at this circuit, I can't tell which side is the input and output [Copy link]

 

Please help me look at this circuit, I can't tell which side is the input and output

wudianjun2001

The input is on the left and the output is on the right. You can tell it by looking at the silk screen.

pqa

wudianjun2001 posted on 2017-1-18 15:13 Input on the left and output on the right, you can tell it by looking at the silk screen

How can you tell it by looking at the silk screen? Isn't the silk screen a silk screen layer on the PCB board?

wudianjun2001

pqa posted on 2017-1-18 15:16 How do you tell by silk screen? Isn't silk screen a layer in the PCB board?

It's the network label. I'm wrong. The JP on the left is usually a connector, and the U on the right is usually a chip

pqa

wudianjun2001 posted on 2017-1-18 15:21 It is the network label, I said it wrong, the JP on the left is usually the connector, and the U on the right is usually the chip

Thank you

maychang

It's hard to say. It could be left-in-right-out or right-in-left-out. It could even be bidirectional. With so little information, it's impossible to tell. Even if you post the entire circuit including the MCU, you still can't tell: you don't know how to set the pin in the program.

dongsy2012

Please post the schematic diagram for everyone to see. Only such a small part cannot be seen.

ienglgge

I can't draw a conclusion, I need a complete circuit, or at least I need to know what the JP end is connected to, which signal. Maybe I can analyze it.

pqa

ienglgge posted on 2017-1-18 21:43 It is impossible to draw a conclusion. A complete circuit is needed. To put it another way, we need to know what is connected to the JP end and which signal it is. Maybe we can analyze it.

Thank you. The JP end is connected to a connector and then to the outside. But we don’t know what sensor is connected to the outside. The whole board is an EPS controller. The circuit is too large. I can’t see it clearly in the screenshot.

pqa

dongsy2012 posted on 2017-1-18 19:34 Please post the schematic diagram so that we can have a look together. It is only this small part that cannot be seen

There is no way, the circuit is too big, the whole screenshot cannot be seen clearly,

ienglgge

pqa posted on 2017-1-18 22:58 Thank you. The JP is connected to a connector and then to the outside, but I don't know what sensor is connected to the outside. The whole board is an EPS controller, ...

If it can be confirmed that it is a sensor, the JP is likely to be the input end of the circuit, and the output is to the pin of the microcontroller. If nothing can be confirmed, there is no conclusion.

ddllxxrr

wudianjun2001 posted on 2017-1-18 15:13 Input on the left and output on the right, you can tell it by looking at the silk screen

I strongly agree

qyzk1989

It is also possible that the signal comes out of the chip and is sent to the connector for other module circuits. It is impossible to judge with only this circuit.

qyzk1989

It is also possible that the signal comes out of the chip and is sent to the connector for other module circuits. It is impossible to judge with only this circuit.

雪枫21

This should be a signal acquisition circuit. Generally speaking, in the acquisition circuit, a resistor needs to be connected in series on the path from the collected point to the chip to play a protective role. So it is speculated that the left side should be the input and the right side should be the output to the chip.

neolee08

JP1 is a connector, U3 is a chip, and the connector should be connected to the chip. The signal can be unidirectional or bidirectional, so the circuit is possible.

Lance93

All possible