Tag Low Power Analysis

This is a document from our development process.

After trying hard, when the tag entering sleep state, the lowest current is 15.x uA.

Let's analyze the possible power consumption areas.

ADC voltage dividing resistor

Two 1M resistors are used to divide the voltage to perform ADC on the battery 3.3V~4.2V.

This voltage divider circuit consumes 1.65 uA ~ 2.1 uA

XC6206P332 LDO

XC6206P332 is responsible for converting the battery voltage to 3.3V

The typical power consumption described on the Datasheet is 1uA , with a maximum of 3uA .

Capacitor leakage

Looking at the Datasheet of Samsung capacitors, the resistance at both ends is usually around 100MOhm. For a 3.3V power supply, the leakage current is equivalent to 3.3/100 uA, which can be almost ignored.

BAV70 charging part diode

In the charging part, BAV70 provides one-way communication. The manual says that at 25V, the reverse current is 40 nA

It can also be ignored.

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