Jieli Br21 Driver [top] 🔔
Jieli BR21 Bluetooth Audio Driver IC: A Technical Write-Up
1. Overview
The Jieli BR21 is a highly integrated, cost-optimized Bluetooth audio SoC (System on Chip) designed for entry-level to mid-range wireless speakers, mono soundbars, and DIY Bluetooth audio receivers. Manufactured by Zhuhai Jieli Technology, the BR21 focuses on delivering stable wireless audio with low power consumption and minimal external components.
9. Comparison with Alternatives
| IC | BT Version | Built-in Amp | Charger | Codec Support | Typical Use | |----|------------|--------------|---------|---------------|--------------| | Jieli BR21 | 5.0 | 2.5W mono | Yes | SBC | Ultra-low-cost mono speakers | | CSR8635 | 4.2 | No | No | SBC, aptX | Higher-quality stereo designs | | AC6925 (Jieli) | 5.0 | 5W+5W | Yes | SBC, MP3 | Low-cost stereo speakers | | ESP32 + I2S | 4.2/5.0 | No | No | SBC, AAC, LDAC (software) | Programmable IoT audio | Jieli Br21 Driver
- BAT+ / BAT-: 3.7V-4.2V Li-ion (Do not exceed 5V directly without an LDO).
- SPK+ / SPK-: Connect directly to a 4-8 Ohm speaker (max 5W recommended).
- BT_ANT: If there is a pad, solder a 2.4GHz antenna or leave the ceramic chip.
- KEY1, KEY2, KEY3: Connect these to ground via tactile switches (or specific resistors for multi-function keys).
- LED: For pairing status indicators.
Part 1: What is the Jieli BR21?
The Jieli BR21 is an integrated circuit (IC) designed by Jieli Technology. It is a Bluetooth audio chip that handles the transmission of sound, battery management, and button controls. It is widely used because it is cost-effective and offers solid performance for the price. Jieli BR21 Bluetooth Audio Driver IC: A Technical
Configuration typically requires specialized SDK tools like the , which are not user-friendly for the average consumer. Technical Breakdown BAT+ / BAT-: 3
The Jieli BR21 is an integrated circuit (IC) that provides both Bluetooth connectivity and USB audio interface capabilities. It is a staple in:
- Bluetooth pairing and A2DP (Advanced Audio Distribution Profile)
- HFP (Hands-Free Profile) for microphone input
- AVRCP (Audio/Video Remote Control Profile) for button commands
- User-defined EQ presets (via a PC configuration tool)
- Power on/off (long press)
- Play/Pause (single press – RX mode)
- Mode switch (TX ↔ RX) – long press or toggle switch
- Next/Previous track (double press)
- Volume up/down (triple press or separate buttons)
I can confirm this works with Ubuntu 22.04. Using at terminal lsusb lists as: "ID 4c4a:4155 Jieli Technology USB Composite Device" Ask Ubuntu Jieli BR21 Bluetooth dongle shown as storage device