This document introduces a simple Bluetooth chip solution (KT6368A) designed for TikTok Bluetooth remotes and selfie controllers. Below is a detailed summary:
I. Background and Core Principles of the Design
Purpose of the Design:
To meet users' basic selfie needs without requiring complex AT command configuration or development processes.
Core Principle:
By emulating a Bluetooth HID (Human Interface Device), the chip simulates the phone's Volume + button to trigger selfies. It can also be extended to support TikTok page turning, menu switching, and other functions.
II. KT6368A Chip Features
KT6368A Bluetooth Chip schematic - Footprints, Peripheral Reference Circuit
- Hardware Characteristics
✅Simple Peripheral Circuit: Only requires one capacitor, one crystal oscillator, and one button to implement selfie functionality.
✅Cost Advantage: This is the lowest-cost solution among TikTok Bluetooth remote controllers.
✅Crystal Requirements: 12pF load capacitance, frequency deviation ±10PPM.
- Functions and Compatibility
✅Basic Functions: Supports selfies on TikTok, Xiaohongshu (RED), and default phone camera apps. Also supports TikTok page up/down and pause/resume operations.
✅Power Consumption:
🔹Tx Mode: 15mA
🔹Rx Mode: 12mA
🔹Suspend Mode: 10μA
🔹Sleep Mode: 0.6μA
✅Operating Range:
🔹Temperature: -40°C to 85°C
🔹Effective control distance: 20 meters
- Bluetooth Connection Features
✅Default Name: KT6368A-EDR-KEY
✅Automatic Broadcasting on Power-On: No button press required to wake up.
✅Pin Functions:
🔹Pin 2 (PA9): Default high level at power-on, low level during broadcast (can be ignored).
🔹Pin 7 (DM): Button input, sends selfie command (VOL+) when pressed.
🔹Pin 8 (DP): Connection indicator, outputs low level when connected, high level when idle.
III. AT Command Extended Features (Advanced Version)
- Bluetooth Name Configuration
✅Command: AT+BD[Name]\r\n (e.g., AT+BDSPP-1234\r\n)
✅Note: After setting, a reset is required (either via command or power cycle). The phone may need to delete the old pairing information and search again.
- TikTok Button Commands
Function Command
Previous Page AT+CC00\r\n
Next Page AT+CC01\r\n
Left Page AT+CC02\r\n
Right Page AT+CC03\r\n
Play/Pause AT+CC05\r\n
Volume + (Selfie) AT+CC06\r\n
Volume - AT+CC07\r\n
Additional Technical Q&A
- How does the KT6368A perform in terms of power consumption for Bluetooth remote control applications?
KT6368A is highly power-efficient:
✅Active modes (Tx/Rx) use 15mA/12mA respectively.
✅In Suspend Mode, it consumes only 10μA.
✅In Sleep Mode, power usage drops to just 0.6μA — ideal for battery-powered remote controllers.
- How can KT6368A enable low-latency control for TikTok selfie operations?
KT6368A boots and broadcasts automatically upon power-up, without requiring user interaction to wake the chip. When the button is pressed, the command (e.g., VOL+) is sent immediately via HID emulation, enabling real-time selfie triggering with minimal delay.
- What Bluetooth protocol versions does the KT6368A support?
KT6368A supports Bluetooth EDR (Enhanced Data Rate), typically aligned with Bluetooth 2.1/3.0 standards, which is sufficient for simple HID-based control and offers compatibility with most smartphones.
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