Power Supply Explanation for the KT1025A BT201 Bluetooth BLE Audio Chip—Minimum, Maximum, and Most Suitable Supply Voltage



Power Supply Explanation for the KT1025A BT201 Bluetooth BLE Audio Chip—Minimum, Maximum, and Most Suitable Supply Voltage




1. Pin 18 of the module is the chip's power supply input, supporting 3.2V to 5.2V. 
2. Pin 12 is the module's internal LDO output—it's an output, pay attention!!
3. For pins you don't understand, just follow the schematics we provided and copy them.

About the chip's power supply and usage tips:
1. The chip is designed for “lithium battery” power scenarios, so pin 18 is named “VBAT,” meaning battery power. The chip's optimal working voltage is around 4.2V, but connecting directly to 5V is completely fine.
2. It supports a wide voltage range of 3.2V to 5.2V. Even slightly lower may work, but testing is required.
3. To support lithium battery power, the chip has a built-in 3.3V LDO to power the chip's core, so the IO operates at 3.3V levels.
4. Pin 12 is the LDO output. When the supply voltage of pin 18 exceeds 3.3V, pin 12 outputs 3.3V. If the input voltage of pin 18 is at or below 3.3V, pin 12 cannot output 3.3V and may be about 0.1V lower.
5. If you're not using an external power amplifier to drive a speaker, the chip works fine at 3.3V, even slightly lower.
6. However, if your system includes a speaker or horn, consider that sound output causes voltage fluctuations.
7. A 3.3V-powered system cannot drive large speakers, as a typical 4-ohm 3W speaker draws around 1A when producing sound, depending on the power amplifier chip. Please consider this carefully.


Important Note: Even if the USB pins are not used, it's best to bring out test points. Please pay close attention to this.

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