WT2605 Series Module Test Fixture
Dedicated Debug and Test Board for WT2605C Bluetooth Audio Modules
The WT2605 Series Module Test Fixture is a dedicated debug and test board designed for WT2605C series Bluetooth audio modules. It provides a complete evaluation platform with onboard controls, multiple audio interfaces, and expansion options. With key controls (Play, Previous/Volume+, Next/Volume-, Stop, Mode), UART communication for serial debugging, onboard and external MIC recording, headphone and speaker outputs, USB firmware upgrade, and TF card support, this fixture is an essential tool for developers working with WT2605C modules.
- WT2605C support – B03, B04, B05 variants
- Key control – Play, Previous/Vol+, Next/Vol-, Stop, Mode
- Dual MIC options – onboard or external MIC
- Multiple outputs – headphone, speaker (8Ω 1W), external amp
- USB upgrade – firmware update via USB drive
Supported Modules
Refer to the TF card configuration section for resistor settings.
WT2605 Series Module Test Fixture Features
Interface & Function Details
Key Controls
- Play – Start/pause playback
- Previous / Volume+ – Previous track or volume up
- Next / Volume- – Next track or volume down
- Stop – Stop playback
- Mode – Switch operation mode
Requires module programmed with corresponding firmware.
MIC Recording
- Onboard MIC – Built‑in microphone for direct recording
- External MIC – External MIC via dedicated interface
- Jumper selection – 5/MIC selects onboard or external MIC
Line‑in recording option is not yet available.
Audio Outputs
- Headphone out – 3.5mm stereo audio jack
- Speaker out – 8Ω 1W direct drive via built‑in amplifier
- External amp – Dedicated port for external amplifier modules
All outputs are available simultaneously.
USB & TF Card
- USB port – Firmware upgrade via USB drive
- TF card slot – microSD card for audio file playback
- CMD/CLK config – R3/R4 pull‑down resistor settings
R3 (1.5kΩ) required for B03/B04; B05 can leave unpopulated.
UART Communication
- Voltage: 5V DC
- Signals: TX, RX, GND
- Use: Serial command debugging
- Connection: Via Type‑C to PC serial tool
Configure serial tool with appropriate baud rate per module.
LED Indicators
- Power (Red) – Lights up when 5V supply is present
- BUSY – Indicates module busy/playback status
BUSY behavior: high = on, low = off (configurable by firmware).
TF Card Configuration
| Module Variant | R3 (CMD) | R4 (CLK) | Note |
|---|---|---|---|
| WT2605B03 / B04 | 1.5kΩ (populated) | Not required | CMD configuration pull‑down |
| WT2605B05 | Not required | Not required | Reserved pads can be left unpopulated |
Application Scenarios
Why Choose WT2605 Test Fixture
Frequently Asked Questions
What modules does this test fixture support?
It supports WT2605C series modules, including WT2605B03, WT2605B04, and WT2605B05 variants.
What are the main control functions?
The fixture features onboard keys for Play, Previous/Volume+, Next/Volume-, Stop, and Mode. These functions require the module to be programmed with the corresponding firmware.
Does it support audio recording?
Yes. It supports MIC recording via both the onboard MIC and an external MIC through the MIC interface. A jumper selects the recording source.
What audio outputs are available?
The fixture provides a headphone jack (3.5mm audio output), an external speaker output (8Ω 1W through built-in amplifier), and an external amplifier output port.
How do I update the module firmware?
Place the firmware upgrade file on a USB drive, insert it into the USB port on the fixture, and follow the module’s upgrade procedure.
What are the power requirements?
The fixture is powered via Type-C 5V input. A red power LED indicates normal power supply.
What is the BUSY LED for?
The BUSY LED indicates the module’s busy/playback status. It is controlled by the module’s BUSY output (high = on, low = off).
What is the TF card slot used for?
The TF card slot supports audio file playback from a microSD card. The CMD and CLK pull-down resistors (R3 and R4) may need to be configured depending on the module variant.
How do I configure the pull-down resistors for the TF card?
For WT2605B03/B04 modules, R3 (CMD) should be populated with a 1.5kΩ resistor. For WT2605B05 modules, R3 and R4 can be left unpopulated.
Can I use this fixture for serial debugging?
Yes. The fixture provides a UART communication interface (5V, TX, RX). Connect to a PC via Type-C and use a serial tool to send commands and debug the module.
Important: Key functions require the module to be programmed with corresponding firmware. For TF card support, configure R3/R4 pull-down resistors according to the module variant (WT2605B03/B04 need R3 = 1.5kΩ; WT2605B05 does not require R3/R4). The line‑in recording option is not yet available. The BUSY LED behavior (high/low) may vary depending on the firmware version.
