Wi-Linktech WLT3266 Dual mode bluetooth module User Manual
- June 5, 2024
- Wi-Linktech
Table of Contents
Wi-Linktech WLT3266 Dual mode bluetooth module User Manual
Summary
WLT3266 is an audio Bluetooth module developed by WLT , and a single chip audio Bluetooth solution based on BK3266.Audioprotocol stack with built in Bluetooth and various applications profile, It can easily realize the interconnection, data transmission, voice, music and other applications of the user’s
Functional characteristics
Support Bluetooth HFP , A2DP, HID,AVRCP…
Support transparent / protocol data transfer mode AT + instruction set
configuration
Support UART communication interface, UART interface up to 3Mbps. Built-in
16-bit audio DAC and 16-bit audio
ADC Built-Capless headphone amplifier
Built-in MIC bias and amplifier
Support multiple analog audio input
Onboard PCB antenna, the customer can also be an external antenna
Single-supply operation 2.8~4.2V
Stamp hole pin, easy and reliable welding. Small size：13×27.2mm
Flexible software platform to provide customized services
Application area
Bluetooth Speaker Bluetooth music transponder Car Bluetooth hands-free Health care Wireless POS machine Portable printer
Electrical characteristics
Basic characteristics
table 1. Absolute maximum
| Parameter | Description | Min | TYP | Max | Unit |
|---|---|---|---|---|---|
| VCC4BAT | Battery regulator supply voltage | -0.3 | – | 4.2 | V |
| VCC5USB | USB power supply voltage | 4.75 | – | 5.75 | V |
| RX | RX Input power | – | 10 | – | dBm |
| TSTR | Storage temperature range | -40 | – | 150 | °C |
table 2. Recommended working conditions
| Parameter | Description | Min | TYP | Max | Unit |
|---|---|---|---|---|---|
| VCC4BAT | Battery regulator supply voltage | 2.8 | 3.6 | 4.2 | V |
| VCC5USB | USB power supply voltage | 4.75 | 5 | 5.75 | V |
| TOPR | Operation temperature range | -40 | – | 80 | °C |
table 3. Antenna characteristics
Wireless Standard| Bluetooth BR/EDR/LE|
---|---|---
Frequency| 2.402GHz～2.480GHz|
TX power| 4dBm|
Antenna| external：RF_PIN|
internal：PCB antenna| High gain as external antenna
Radio frequency performance
table 4.Radio frequency performance
| Parameter | Condition | Min | TYP | Max | Unit |
|---|---|---|---|---|---|
| Operate Frequency | 2402~2480 | 2402 | – | 2480 | MHz |
| RXSENS-1 Mbps | BER=0.001 | – | -88 | – | dBm |
| RXSENS-2 Mbps | BER=0.0001 | – | -91 | – | dBm |
| RXSENS-3 Mbps | BER=0.0001 | – | -83 | – | dBm |
| Maximum received signal | BER=0.001 | 0 | – | – | dBm |
| Maximum RF transmit power | – | 8 | – | dBm | |
| RF Power Control Range | 30 | – | – | dBm |
table 5. Audio performance
| Parameter | Condition | Min | TYP | Max | Unit |
|---|---|---|---|---|---|
| DAC Diff. Output | With 600ohm loading | – | – | 1.1 | Vrms |
| With 32ohm loading | – | – | – | Vrms | |
| With 16ohm loading | – | – | 0.9 | Vrms | |
| DAC Diff. Output THD | With 1.1Vrms@600ohm loading | – | 75 | – | dB |
| With 0.8Vrms@16ohm loading | – | 75 | – | dB | |
| DAC output SNR | 1 kHz sine wave | – | 98 | – | dB |
| DAC Sample Rate | 8 | – | 48 | kHz | |
| ADC SNR | 1 kHz sine wave | – | 96 | – | dB |
| ADC Sample Rate | 8 | – | 48 | kHz |
Hardware introduction
Functional block diagram
figure 1. WLT3266Block diagram of the module
WLT3266 There are two main parts inside the module：
- Bluetooth part：Contains the Bluetooth chip BK3266，2.4GHzPCB Antenna and external interface.
- Audio section ： WLT3266integrated Audio Codec, Provides analog audio input and output, Digital audio input and output, Headphone amplifier and so on, Support for Bluetooth HFP，A2DP（Source 和 Sink）Other audio applications.
Module size and pin arrangement
figure2. WLT3266Module Dimensions (Front)
figure3. WLT3266Module thickness
Pin definition
table 6. WLT3266Pin definition
| Pin # | Name | Type | Description |
|---|---|---|---|
| 1 | UART_TX | I/O | UART_TXD/I2C_SCL, Download port |
| 2 | UART_RX | I/O | UART_RXD/I2C_SDA, Download port |
| 3 | GND | POWER | Ground |
| 4 | LINEIN_L | I | Line in L |
| 5 | LINEIN_R | I | Line in R |
| 6 | P15 | I/O | SPI_SCK/ADC2/CLKOUT |
Soft shut down and wake up (active high)
7| NC| |
8| SD_CMD| I/O| JTAG_TMS/PWM3/PCM_CLK/SD_CMD/SPI2_MOSI
9| SD_CLK| I/O| JTAG_TCK/PWM2/ADC4/PCM_SYNC/SD_CLK/SPI2_SCK
10| SD_DAT| I/O| JTAG_TDI/PWM4/ADC6/PCM_DIN/SD_DATA0/SPI2_MISO
11| RESET| –| External reset input, active low
12| VDD| POWER| Battery power supply
13| GND| POWER| Ground
14| VCC5USB| POWER| USB charge power input
15| USBDN| I/O| PWM1 / USBN
16| USBDP| I/O| PWM0 / USBP
17| AUDRP| O| Audio right channel positive
18| AUDRN| O| Audio right channel negative
19| AUDLN| O| Audio left channel negative
20| AUDLP| O| Audio left channel positive
21| MICREF| POWER| Microphone reference voltage
22| MICRN| I| Microphone input negative
23| MICRP| I| Microphone input positive
24| GPIO14| I/O| Digital input and output
25| ANT| –| External ANT PIN
26| GND| POWER| Ground
figure 4. Description of 26-Pin Package
Reference design
Figure 5. Reference design
Note: GPIO14 as amplifier enable pin, high level effective. When the customer uses the audiopower amplifier, the GPIO14 needs to be connected to the enable pin of the chip. Refer to figure 6 below:
Figure 6. GPIO14 Reference design
PCB Design
Recommended weld plate size
PCB layout Matters needing attention
Bluetooth is working 2.4GHz under the frequency, Should try to avoid the impact of various factors on the wireless transceiver, pay attention to the following points:
- The part of the product enclosure that surrounds the module avoids the use of metal, and if the enclosure is metallic, consider using an external antenna.
- Metallic screws inside the product should be kept away from the RF part of the module.
- Module should be placed around the motherboard, the antenna part of the edgeor angle, the module antenna below the motherboard area does not allowcopper shop or alignment.
Reflux parameter recommendation
Reflow parameters can refer to the following settings:
figure 8. Reflow recommended curve
table 7. Reflow recommended parameters
| Temperature range | Time | Key parameters |
|---|---|---|
| Preheat zone(<150℃) | 60-120S | Ramp up rate:≤2S |
| Uniform temperature zone(150-200℃) | 60-120S | Ramp up rate:<1S |
| Recirculation zone(>217℃) | 40-60S | Peak:240-260℃ |
| Cooling zone | Ramp down rate:1℃/s≤Slope≤4℃/s |
Software application
WLT3266 is an audio Bluetooth module that supports Audio Codec. The module integrates audio Bluetooth protocol stack, supports a variety of traditional Bluetooth applications and Bluetooth low energy applications. For example: HFP, A2DP, AVRCP and so on. WLT3266 module supports UART AT + command mode to configure and select the mode of operation, the specific command, please see the relevant WLT3266 module software application documentation. WLT3266 module to support custom software, please contact our company
Regulatory Module Integration Instructions
List of applicable FCC rules
This device complies with part 15 of the FCC Rules.
Limited module procedures
Not applicable
Summarize the specific operational use conditions
This module can be applied in remote Bluetooth Speaker, Bluetooth music transponder Car and Bluetooth hands-free Health , Wireless POS, Portable printer as well as smart home. The input voltage to the module should be nominally 2.8-4.2 V DC ，typical value 3.3V DC and the ambient temperature of the module should not exceed 80℃.
RF exposure considerations
Module is limited to OEM installation ONLY.
That OEM integrators is responsible for ensuring that the end user has no manual instructions to remove or install module. That module is limited to installation in mobile or fixed applications, according to Part 2.1091(b).
FCC Radiation Exposure Statement
This modular complies with FCC RF radiation exposure limits set forth for an uncontrolled environment. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.
Label and compliance information
If the FCC identification number is not visible when the module is installed inside another device, then the outside of the device in to which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording such as the following: “Contains Transmitter Module FCC ID: 2AOO6-WLT3266 Or Contains FCC ID: 2AOO6 WLT3266”
When the module is installed inside another device, the user manual of the host must contain below warning statements、
- This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
- This device may not cause harmful interference.
- This device must accept any interference received, including interference that may cause undesired operation.
- Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
The devices must be installed and used in strict accordance with the manufacturer’s instructions as described in the user documentation that comes with the product
Additional testing， Part 15 subpart B disclaimer
The final host / module combination need to be evaluated against the FCC Part 15B criteria for unintentional radiators in order to be properly authorized for operation as a Part 15 digital device . The host integrator installing this module into their product must ensure that the final composite product complies with the FCC requirements by a technical assessment or evaluation to the FCC rules， including the transmitter operation and should refer to guidance in KDB 996369.
Frequency spectrum to be investigated
For host products with certified modular transmitter ，the frequency range of investigation of the composite system is specified by rule in Sections 15.33(a)(1) through (a)(3) ，or the range applicable to the digital device， as shown in Section 15.33(b)(1)，whichever is the higher frequency range of investigation.
FCC Statement
Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
- This device may not cause harmful interference ， and
- This device must accept any interference received, including interference that may cause undesired operation
ISED RSS Warning/ISED RF Exposure Statement
ISED RSS Warning: This device complies with Innovation, Science and Economic Development Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions:
- this device may not cause interference, and
- this device must accept any interference, including interference that may cause undesired operation of the device.
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