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This lesson talks about the Oppo battery detection circuit

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This is the battery holder, the battery holder is where the battery is connected

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The battery holder communicates with the CPU through these two 33 ohm resistors

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In this line, it uses the I2C bus communication

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The I2C bus has two lines, one is SCL, and the other is SDA

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And the I2C line must have a pull-up resistor, and one end of the pull-up resistor is a 1.8-volt power supply

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This line must have this 1.8 volt power supply first, this is the first step

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There is no problem with the resistance soldering, and the resistance is not damaged,

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then the two wires will have 1.8 volts

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There is 1.8 volts here, and after the battery passes through a 33 ohm resistor, there is 1.8 volts here

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The line from the battery holder to the CPU must have a high level of 1.8 volts,

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so that the CPU can read the battery information through the I2C bus

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What should be paid attention to during maintenance is that

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the first step is to ensure that the power supply is normal

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The second step, the pull-up resistor should be normal

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Third, the 1.8 volt voltage here should be normal

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Fourth, the two 33 ohm resistors are normal

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There is no abnormality in the resistance, and the voltage of 1.8 volts reaching the battery holder

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During maintenance, if the voltage of 1.8 volts cannot be measured at the battery terminal,

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we need to check the fourth step, whether there is any problem with the resistor

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Measure whether there is voltage on the left side of the resistor, which is the third step

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If there is no 1.8 volts on the left side of the resistor,

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we need to check whether there is a problem with the pull-up resistor,

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which is to check the second step

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If the pull-up resistor is OK, we will check the first step to see if there is a voltage of 1.8 volts here

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Maintenance is a reverse process

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It should also be noted here that Oppo mobile phones support wireless charging

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There are wireless charging chips and wireless charging switch chips in the circuit,

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and the I2C bus in the circuit also leads to them

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If there is a problem with these two lines, the I2C bus cannot detect the wireless charging chip,

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which will also cause abnormal battery contact.

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This is Oppo's battery detection circuit

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That's all for this lesson