The design principle and reference circuit of KT6368A Bluetooth chip with switch

Design scheme of KT6368A Bluetooth Chip and switch Circuit


The Bluetooth chip of KT6368A has a very simple periphery, with sop8 packaging and no extra pins to achieve some simple functions.

For example: forced reset, single IO shutdown and startup.

To achieve such a function, only the way of controlling the power supply can be chosen, and it is also very simple to implement.

The reference circuit is as follows: The principle is to control the MOSFET 2301 through transistor 8050 to achieve the switching of the power supply.

Components are also the most common. Of course, a 3.3L VLDO chip with enable can also be chosen.

Some customers use a single IO port of the MCU to directly power the Bluetooth chip and set it to push-pull output

As long as the driving capacity can reach 30mA, it's also fine

Why is it necessary to reach 30mA? Because the starting current of a Bluetooth chip is relatively large at the moment it is powered on, lasting approximately 100ms. After exceeding 100ms, the chip returns to a normal current, which is around 6mA

The minimum system pcb reference corresponding to the KT6368A Bluetooth chip is as follows:






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