Circuit principle?

hau30729

Circuit principle? [Copy link]

The newcomer took over an old circuit and did not understand the testing principles of the fixture.

1. CN1 and CN2 will be connected to the DGND of CN1_1 and CN2_2 respectively (the DGND of the fixture and the circuit will be connected)
2. After connecting to DGND, ADC1_IN must be able to reach 2.3V~2.8V to be considered a PASS
3. After connecting to DGND, ADC2_IN must be able to reach 60mV~110mv to be considered a PASS

What I don't understand is:
1. Why are CN1 and CN2 connected to DGND?
2. Why can ADC1 and 2 reach this voltage?

If there is anything unclear in the description, please let me know, thank you!

strong161

It is for testing. It is directly related to the fixture and the circuit itself, and is determined by the original test quality control method design.

hau30729

strong161 posted on 2019-6-6 16:41 Help, it is used for testing, this is directly related to the fixture and the circuit itself, and is determined by the original test quality control method design,

Yes, it is for testing. It is a test fixture for mass production.

qwqwqw2088

CN1 and CN2 will be connected to CN1_1 and CN2_2 respectively

To find out which control chip these pins come from, then find the chip data for reference

The manual will show you how to connect