KT6368A Bluetooth Chip

UART Interface

Standard UART interface with TTL level，Baud rate is configurable，A level converter (e.g., CH340G—USB to TTL) is required when connecting to a PC.

Input Voltage

Recommended voltage: 3.3V (operating range: 2.2V–3.4V).

Rated Current

Chip startup current: 20mA.Enters low-power mode immediately after startup,  alternating between 20µA (broadcasting) and 4mA (wake-up).After a successful connection, the current remains constant at 4mA.

Low Power Consumption Current

The chip calculates average current because it continuously alternates between low-power mode and wake-up mode internally.

Operating Temperature

Range: -40°C to 80°C.

Humidity

Range: 5% to 95%.

Main Chip Model

KT6368A [SOP8][shipped in tubes],KT6328A [SOP8][shipped in tubes]

Step 1

Set up the peripheral circuit for the chip and supply it with 3.3V power. For the Bluetooth antenna, simply solder a wire in place.

Step 2

Check if Pin 2 of the chip outputs a high level for 1 second upon power-on. Connect an indicator light to observe this.

Step 3

Connect to a computer using a serial port assistant tool. Verify if the chip’s TX pin returns data at a baud rate of 115200.

Step 4

Create your actual board and debug it with the MCU.

UART Considerations

1. The internal IO voltage of our chip is 3.3V.

2. When connecting to an external MCU, add series resistors (approximately 100 ohms) to the RX and TX lines. If the MCU’s IO level exceeds 3.3V, increase the resistor value to 1K.

3. Pin 8 of the chip is the TX pin of the KT6368A, which connects to the RX pin of the MCU. Pin 7 is the RX pin of the chip, which connects to the TX pin of the MCU.

Power Supply Considerations

The maximum supply voltage for the chip is 3.4V.

Pin 2 Considerations

Pin 2 is the connection status pin. It outputs a high level when connected successfully and remains in a high-impedance state when disconnected. During debugging, it is recommended to connect an indicator light or route it to an external MCU. Ensure a 10K pull-down resistor is connected to ground.

Detailed Descriptions

1. Strictly adhere to the recommended supply voltage. There are no significant requirements for the power supply design.

2. For the Bluetooth antenna, follow the provided footprint. The technology is mature, and the communication distance typically exceeds 15 meters.

3. Test points must be reserved for Pins 7 and 8, as they serve as the upgrade interface. This is crucial in case an upgrade is needed.