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Hello everyone, today let's learn about the EC's management of batteries

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This course is divided into two parts,

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battery interface signal introduction and battery management by EC

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First, let's look at the battery interface pin definition

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This BATT+ is the battery power supply

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The power supply output and charging voltage input are connected to the battery through these 3 pins

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SMB_CLK, SMB_DAT, which is the system management bus clock and data

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The two cables are connected to the EC.

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The EC obtains the battery power information through the two cables

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BATT_PRES#, this is the battery insertion identification signal

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When no battery is plugged in,

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the signal is pulled up to high by the 3.3V standby power supply

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When plugged into the battery, the signal is pulled down to low

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A low level indicates that the battery is plugged in, a high level indicates that the battery is not plugged in

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These pins are connected to GND, which is the negative terminal of the battery

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Let's take a look at the EC's management of the batteries

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After the EC detects that the battery is inserted,

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it reads the battery power information through the system management bus

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If the battery is found to need charging,

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it will control the charging circuit through the system management bus

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This is the charging chip, and this is the charging inductor

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The EC controls the charging circuit to generate the charging voltage

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to charge the battery and replenish its energy

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If the EC does not recognize that a battery has been inserted,

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an icon of the battery is displayed in the system

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It is a red cross to indicate that no battery is detected

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If the battery is properly inserted and identified,

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the battery's power information can be seen in the system and its charging state can be seen

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This is the EC's management of the battery