TOPYTECH TPL3937 Dual Module Owner’s Manual

TOPYTECH TPL3937 Dual Module

Product Information

Specifications

• Module Name: TPL3937 Dual Module
• Package Size: Ultra small
• Voltage Range: 2.2V – 4.4V
• Wireless Standard: BLE 5.1
• Frequency Range: N/A
• Output Power: N/A
• Sensitivity: N/A
• Default Communication Interface: UART
• FLASH Size: 8Mbit
• RAM Size: 64KB
• GPIO Number: N/A
• Work Temperature: N/A
• Storage Temperature: N/A

Introduction
TPL3937 is a BLE 5.1 dual mode Bluetooth module with a built-in Bluetooth protocol stack. It supports short-distance music transmission and can easily connect to Bluetooth devices like mobile phones for wireless music transmission and data synchronization.

Main Features:

• Built-in 64KB SRAM and 8Mbit flash
• Supports various profiles such as A2DP, BLE, AVRCP, HFP, SPP, HID
• Supports low power Bluetooth data transparent transmission
• Supports AT command control
• Ultra small package

Module Placement Requirements
To ensure optimal performance:

1. Avoid placing metal parts around the antenna
2. Keep metal screws inside the product housing away from the RF part of the module
3. Follow suggested layout options for module placement on the soleplate
   • Option 1: Place the module at the edge of the motherboard with the antenna area extending beyond the edge
   • Option 2: Place the module at the edge of the motherboard, leaving an empty area at the antenna position
   • Option 3: If limited by space, ensure a clearance area around the module PCB antenna with no copper, wiring, or components placed nearby

Hardware Design Considerations
For optimal hardware design:

• Avoid metal in the product housing
• Avoid high-frequency devices near the antenna
• Minimize impact of soleplate on module PCB antenna performance

Pin Definition
Reference Design

FAQ

• Q: What is the voltage range supported by the TPL3937 module?
  A: The TPL3937 module supports a voltage range of 2.2V to 4.4V.

• Q: Which Bluetooth version does the TPL3937 module support ?
  A: The TPL3937 module supports BLE 5.1 dual mode Bluetooth.

TPL3937 Dual Module Datasheet

Introduction

TPL3937 is a BLE 5.1 dual mode Bluetooth module with a built-in Bluetooth protocol stack, which can be used for short distance music transmission and can be easily connected to Bluetooth devices such as mobile phones to achieve wireless music transmission. And synchronization can support data transmission function, which can be widely used in various application scenarios that require both audio transmission and data transmission。

• The other main features of the module are as follows:
• 64KB SRAM Built in 8Mbit flash,
• Support various profiles such as A2DP, BLE, AVRCP, HFP, SPP, HID, etc
• Support low power Bluetooth data transparent transmission
• Support AT command control
• Ultra small package

Module Parameters

Module Size

Pin Definition

| | | |
---|---|---|---|---
1| USBDM| USB Data Minus| USB_D-| Debug Port
2| USBDP| USB Data Positive| USB_D+| Debug Port
3| PA6/UART_RX| Digital I/O| Communication serial port RXD|
4| PA5/UART_TX| Digital I/O| Communication serial port TXD|
5| PA8| Digital I/O| GPIO|
6| PA2| Digital I/O| GPIO|
7| PA2| Digital I/O| GPIO|
8| PA0| Digital I/O| GPIO|
9| DACR-| Audio output R-| The right channel outputs a negative level| Differential audio output
10| DACR+| Audio output R+| The right channel outputs a positive level| Differential audio output
11| DACL-| Audio output L-| The left channel outputs a negative level| Differential audio output
12| DACL+| Audio output L+| The left channel outputs a positive level| Differential audio output
13| PB9| Digital I/O| GPIO|
14| PB8| Digital I/O| GPIO|
15| PB4/7| Digital I/O| GPIO|
16| PB2/3| Digital I/O| GPIO|
17| PB0/1| Digital I/O| GPIO|
18| GND| Power Ground| |
19| VCC| Power Supply| 2.2V-4.4V|
20| PC5| Digital I/O| GPIO|
21| PC4| Digital I/O| GPIO|
22| PC3| Digital I/O| GPIO|
23| PC2| Digital I/O| GPIO|

Reference Design

Hardware Design Considerations

Module placement requirements on the bottom plate

1. In order to meet the performance of the antenna on board, it is forbidden to place metal parts around the antenna, away from high frequency devices.Avoid using metal in the product housing and keep metal screw inside away from the RF part of the module.

2. Pay attention to the layout of the module on the soleplate, and minimize the impact of the soleplate on the performance of the module PCB antenna.
   The following are suggested:

   • Option 1: Place the module at the edge of the motherboard and the antenna area extends beyond the edge of the motherboard.
   • Option 2: Place the module at the edge of the motherboard, which empties an area at the antenna position.
   • Option 3: If the above scheme is limited and cannot be implemented, make sure that the area of the module PCB antenna and the area of 5 mm extension need to be cleared (copper, wiring and placement of components are strictly prohibited).

power supply requirements

1.  It is recommended to use DC regulator power supply to supply power to the module. The power ripple factor is as small as possible and the module needs to be grounded reliably. Please note that the correct connection between the positive and negative poles of the power supply, such as reverse connection may cause permanent damage to the module.
2. Check the power supply to ensure that between the recommended supply voltage, if the maximum value is exceeded, the module will be permanently damaged; check the power supply stability, the voltage should not fluctuate significantly and frequently;
3. Recommend 3.3V voltage, LDO power supply is recommended; if using DC-DC, ripple control is recommended within 30mV.The DC-DC power supply circuit suggests reserving the position of the dynamic response capacitance to optimize the output ripple when the load varies greatly.

UART Communication
UART communication between module and master MCU through serial port supports full duplex transmission and reception of TX and RX.

Reflow Profile

FCC Statement

FCC standards : FCC CFR Title 47 Part 15 Subpart C Section 15.247
Device is equipped with PCB antenna , Antenna gain 3dBi
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:

1.  This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause undesired operation.
   Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

Note : This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

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.
If the FCC identification number is not visible when the module is installed inside another device, then the outside of the device into 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: 2BG7T-TPL3937 Or Contains FCC ID: 2BG7T-TPL3937”

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:

1. This device may not cause harmful interference;
2. This device must accept any interference received, including interference that may cause undesired operation.

Note : This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

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  Any company of the host device which install the modular with modular approval should perform the test of radiated & conducted emission and spurious emission, etc. according to FCC part 15C : 15.247 and 15.209 & 15.207 ,15B Class B requirement, Only if the test result comply with FCC part 15C : 15.247 and 15.209 & 15.207 ,15B Class B requirement then the host can be sold legally.

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