WT2605C-32N Bluetooth Audio Chip
Dual‑Mode Bluetooth 5.3 with 240MHz DSP, Stereo DAC & AT Command Control
The WT2605C-32N is a high‑performance Bluetooth audio chip powered by a 32‑bit processor running at up to 240MHz. Featuring dual‑mode Bluetooth 5.3 (BR/EDR/BLE), it supports A2DP, AVRCP, HFP, and SPP profiles for music streaming, hands‑free calling, and BLE data transmission. With stereo 16‑bit DAC (95dB SNR), AAC/SBC audio decoding, AT command control, and support for SPI‑Flash, TF card, and USB drive storage, it is the ideal solution for Bluetooth speakers, car audio, and smart home devices.
- 240MHz DSP – high‑performance audio processing
- Dual‑mode BT 5.3 – BR/EDR + BLE
- Stereo DAC – 16‑bit, 95dB SNR
- AAC/SBC – high‑quality audio decoding
- AT commands – simple UART control
Function Code Options
| Code | Function Description | Interface |
|---|---|---|
| A001 | Local Audio Playback + Recording | UART (AT) |
| A021 | Streaming Media | UART (AT) |
| L009 | Bluetooth Audio + Call + Local Playback | UART (AT) |
| L010 | Bluetooth Audio + Call + Voice Control | UART (AT) |
| L011 | Bluetooth Audio + Call + BLE + Local Playback | UART (AT) |
| L012 | Bluetooth Audio + Call + BLE + Local Playback | UART (Hex) |
| L013 | Local Audio Playback + BLE | UART (AT) |
| L020 | Bluetooth Audio Transmitter | UART (AT) |
Contact Waytronic sales to select the appropriate function code for your application.
Bluetooth Features
Key Features
Technical Specifications
| Parameter | Value / Condition |
|---|---|
| Package | QFN32 (4×4mm) |
| Processor | 32‑bit, up to 240MHz |
| Operating Voltage | 2.8V – 5.0V |
| Bluetooth Version | 5.3, dual‑mode (BR/EDR + BLE) |
| Bluetooth Profiles | A2DP, AVRCP, AVDTP, HFP, SPP, SMP, ATT, GAP, GATT, RFCOMM, L2CAP |
| Audio Decoding | SBC, AAC |
| Audio Formats | MP3, WAV (8–44.1kHz, 8–320kbps) |
| DAC Resolution | 16‑bit stereo, 95dB SNR |
| ADC Resolution | 16‑bit, 90dB SNR |
| Storage Media | SPI‑Flash (128Mbit), TF (32GB), USB (32GB) |
| Control Interface | UART (115200 baud, AT commands) |
| Volume Levels | 32 (0–31) |
| Bluetooth Range | Up to 10 meters (with proper layout) |
| Crystal | 24MHz, 12pF, ±10PPM |
| Operating Temperature | ‑40°C ~ +85°C |
| Storage Temperature | ‑65°C ~ +150°C |
Pin Functions (QFN32)
| Pin | Name | Function |
|---|---|---|
| 0 (PAD) | GND | Bottom pad – must be grounded |
| 1 | VMID | 1µF cap to ground |
| 2 | DACL | Left channel DAC output |
| 3 | DACR | Right channel DAC output |
| 4 | GND | Ground (connect to pad) |
| 5 | P01 | GPIO |
| 6 | SDCMD | SD card chip select |
| 7 | SDCLK | SD card clock |
| 8 | SDDAT | SD card data |
| 9 | PWM1 | PWM channel 1 |
| 10 | VCC | Power input (2.8–5.0V) |
| 11 | VREG | 1µF cap to ground |
| 12 | PWM2 | PWM channel 2 |
| 13 | P05 | GPIO |
| 14 | P06 | GPIO / BLE passthrough enable |
| 15 | P07 | GPIO |
| 16 | ANT | Bluetooth antenna |
| 17 | XIN | Crystal oscillator input |
| 18 | XOUT | Crystal oscillator output |
| 19 | SPI_DO | Flash data output |
| 20 | SPI_DLK | Flash clock |
| 21 | SPI_DI | Flash data input |
| 22 | SPI_CS | Flash chip select |
| 23 | D− | USB D− / Programming |
| 24 | D+ | USB D+ / Programming |
| 25 | UART_RX | UART receive |
| 26 | UART_TX | UART transmit |
| 27 | P18 / BUSY | Busy signal output |
| 28 | P17 | GPIO |
| 29 | VDDDAC | DAC power |
| 30 | MIC | Microphone input |
| 31 | VOUT | 3.3V LDO output (1µF cap to ground) |
| 32 | AGND | Analog ground (connect to GND via 0R) |
Application Scenarios
Why Choose WT2605C-32N
Frequently Asked Questions
What is the WT2605C-32N?
WT2605C-32N is a high-performance Bluetooth audio chip with a 32-bit processor up to 240MHz, dual-mode Bluetooth 5.3 (BR/EDR/BLE), stereo 16-bit DAC, AAC/SBC audio decoding, and AT command control in a compact QFN32 package.
What Bluetooth profiles are supported?
It supports A2DP, AVRCP, AVDTP, HFP, SPP, SMP, ATT, GAP, GATT, RFCOMM, and L2CAP, enabling music playback, hands-free calling, and BLE data transmission.
What audio decoding formats are supported?
It supports SBC and AAC audio decoding for high-quality Bluetooth audio playback.
What storage media are supported?
It supports SPI-Flash up to 128Mbit, TF card up to 32GB, and USB drive up to 32GB. Files can be copied between these devices.
Does it support voice recording?
Yes. The chip features a 16-bit ADC with 90dB SNR and supports recording via the MIC input pin.
What control interface does it use?
It uses a standard UART interface with AT commands (default 115200 baud, 3.3V TTL level) for playback, volume, mode switching, and query operations.
What is the operating voltage range?
The chip operates from 2.8V to 5.0V, compatible with both 3.3V and 5V systems.
What are the Bluetooth modes?
The chip has two modes: Bluetooth mode (default) for wireless streaming from phones/tablets, and Audio mode for playback from Flash/TF/USB. The AT+CHMODE command switches between them.
What is the Bluetooth name and range?
The default Bluetooth name is ‘BT_WT2605C’. The range is up to 10 meters with proper PCB layout and antenna design.
What are the typical applications?
Bluetooth speakers, stereo headsets, car audio systems, dashcams, smart home devices, medical equipment, fitness equipment, and electric vehicle dashboards.
Important: A 24MHz crystal (12pF, ±10PPM) is required for Bluetooth operation. The antenna circuit must be designed with 50Ω impedance matching (π‑network). For external Flash, Waytronic‑branded Flash is recommended for guaranteed compatibility. The chip defaults to Bluetooth mode on power‑up – use AT+CHMODE to switch to Audio mode. The bottom pad (pin 0) must be grounded. When both USB and TF card are present, TF card takes priority.
