Foshan STEPON Technology Co Ltd CM21-V2.0 Bluetooth Module Instructions

Foshan STEPON Technology Co Ltd CM21-V2.0 Bluetooth Module

Product Information

Specifications:

• Model: CM21-V2.0
• Bluetooth Specifications: Bluetooth V5.0
• Supports Protocols: Bluetooth AVRCP1.6, A2DP1.3, HandsFree1.7, SPP1.2
• Working Current: 9mA
• Standby Current: 10 meter
• Transmission Power: Support CLASS2/3
• Sensitivity: -80dBm
• Frequency Range: 2.402GHz-2.480GHz
• External Interface: PIO, UART
• Audio Performance:
  • Audio Signal-to-Noise Ratio: Dual channel 75dB
  • Distortion: 0.1%
• Module Size: 29X15X2mm

Product Usage Instructions

Summary:

The CM21-V2.0 is a Bluetooth module developed for wireless audio data transmission. It utilizes Bluetooth 5.0 technology for high-quality sound and compatibility, offering a driver-free solution for wireless music transmission.

Application:

This module is ideal for short-distance music transfer and can be used with devices such as laptops, phones, and tablets to enable wireless music streaming.

Parameter Details:

The module’s parameters include working current, standby current, transmission power, sensitivity, frequency range, external interface, audio performance, and module size. Refer to the specifications above for detailed information.

Pin Function Description:

The pin functions are outlined in the manual’s appendix C and include various GPIO inputs and outputs for different system configurations and detections

Frequently Asked Questions

Q: What is the main use of the CM21-V2.0 Bluetooth module?

A: The CM21-V2.0 is designed for intelligent wireless audio data transmission, providing a low-cost and efficient solution for customers to enjoy wireless music streaming.

Q: How can I connect the CM21-V2.0 module to my device for music transfer?

A: Simply connect the module to your application product using the provided GPIO interfaces or UART connection to enable wireless music transmission from your device.

Foshan STEPON Technology Co., Ltd

Product： CM21-V2.0
Latest Version： V2
Update date： 2021.1.13

Foshan STEPON Technology Co., Ltd
TEL:+86-757-66856874
FAX:+86-757-66856817

Version Instruction

Summary

CM21-V2.0 It is a Bluetooth module independently developed and defined by our company for intelligent wireless audio data transmission. Based on the Bluetooth 5.0 version chip design, it provides low-cost and high-efficiency solutions for end customers
Line transmission scheme. The Bluetooth 5.0 version provides high-quality sound quality and compatibility for the module, resulting in improved overall performance Optimization. In addition, by adopting a driver free method, customers only need to connect the module to the application product, and then It can quickly achieve wireless transmission of music and enjoy the fun of wireless music.

Application

This module mainly used in music short distance transfer, it can conveniently used in laptop, phone, PAD etc. digital product’s Bluetooth device connect, let the wifi music transfer come true，Example：

• Bluetooth Audio
• Bluetooth ear phone
• Bluetooth wireless audio transmission Bluetooth hands-free phone

Parameter

10 meter

Transmission power| Support CLASS2/3
sensitivity| -80dBm
frequency range| 2.402GHz-2.480GHz
External interface| PIO, UART
Audio performance| Dual channel
Audio signal-to-noise ratio|

≥75dB

Distortion| ≤0.1%
Module size| 29X15X2mm

Pin Function Description（Pin diagram can be found in the appendix C）

PIN

|

NAME

|

TYPE

|

FUNCTION

---|---|---|---

1

|

P00

|

Input/Output,Digital

| GPIO, default pull-high input

1.  Slide Switch Detector.

2.  UART TX_IND

2

|

EAN

|

Input,Digital

| Embedded ROM/External Flash enable

H: Embedded; L: External Flash

3

|

P30

|

Input/Output,Digital

| GPIO, default pull-high input

Line-in Detector

4

|

P20

|

Input/Output,Digital

| GPIO, default pull-high input

1.  KEY PIN for FT Test

2.  System Configuration, H: Application L: Baseband(IBDK Mode)

5

|

P15

|

Input/Output,Digital

| GPIO, default pull-high input

1.  NFC detection pin

2.  Out_Ind_0

3.  Slide Switch Detector.

---|---|---|---

6

|

P04

|

Input/Output,Digital

| GPIO, default pull-high input.

1.  NFC detection pin

2.  Out_Ind_0

7| SPKR| Onput,Digital| R-channel analog headphone output
8| AOHPM| Output,Digital| Headphone common mode output/sense input.
9| SPKL| Output,Digital| L-channel analog headphone output

10

|

VDDA

|

Power

| Positive power supply/reference voltage for CODEC
11| MIC1_P| Input,Digital| Mic 1 mono differential analog positive input
---|---|---|---
12| MIC1_N| Input,Digital| Mic 1 mono differential analog negative| input
13| MIC_BIAS| Power| Electric microphone biasing voltage
14| AIR| Input,Digital| R-channel single-ended analog inputs
15| AIL| Input,Digital| L-channel single-ended analog inputs

16

|

RST

|

Input,Digital

| KEY PIN for FT Test

System Reset Pin

17

|

VCC_RF

|

Power

| RF power input for both synthesizer and

block

| TX/RX

18

|

P01

|

Input/Output,Digital

| GPIO, default pull-high input

1. FWD key when class 2 RF 2.Class1TXControlsignalofexternalTR

when class 1 RF

3. Serial flash control.

|

switch

19| VDD_IO| Power| I/O power supply input
20| ADAP_IN| Power| Power adaptor input
---|---|---|---
21| BAT_IN| Power| Battery input
22| AMB_DET| Power| ADC analog input 1
23| GND| Power| Exposed pad as ground
24| SYS_PWR| Power| System Power Output
25| BK_OUT| Power| Buck output
26| MFB| Input,Digital| Multi-Function Push Button key
27| LED1| Input,Digital| LED Driver 1
28| LED2| Input,Digital| LED Driver 2

29

|

P24

|

Input/Output,Digital

| GPIO, default pull-high input

1.   KEY PIN for FT Test

2.   System Configuration,

L: Boot Mode with P2_0 low combination

30

|

P02

|

Input/Output,Digital

| GPIO, default pull-high input

Play/Pause key as the default setting

31

|

P03

|

Input/Output,Digital

| GPIO, default pull-high input

1.   REV key

2.   Buzzer Signal Output

3.   Out_Ind_1 4.Class1RXControlsignalofexternalTR

when class 1 RF

5. Serial flash control.

|

switch

32

|

HCI_TXD

|

Input/Output,Digital

| KEY PIN for FT Test

HCI TX data

33

|

HCI_RXD

|

Input/Output,Digital

| KEY PIN for FT Test

HCI RX data

---|---|---|---

34

|

P05

|

Input/Output,Digital

| GPIO, default pull-high

Volume down (default)

| input

35

|

P27

|

Input/Output,Digital

| GPIO, default pull-high

Volume up key (default)

| input

36

|

P24

|

Input/Output,Digital

| GPIO, default pull-high

1. KEY PIN for FT Test

| input
2. System Configuration,

L: Boot Mode with P2_0 low combination

37| GND| Power| Exposed pad as ground
38| ANT1| Signal| External antenna/state output
39| ANT2| Signal| External antenna/state output
40| ANT3| Signal| External antenna/state output

Attention

1. PCB board： The antenna part of the Bluetooth module is a PCB antenna. Due to the weakening of the antenna function caused by metal, it is strictly prohibited to lay or wire under the module antenna when laying the board. It would be better if it could be hollowed out.
2. Regarding the usage environment of wireless Bluetooth, wireless signals, including Bluetooth applications, are greatly affected by the surrounding environment. Obstacles such as trees and metals can absorb wireless signals to a certain extent, which can be useful in practical applications.
3. Due to the fact that Bluetooth modules need to be paired with existing systems and placed inside the casing. Due to the shielding effect of the metal shell on wireless radio frequency signals. So it is recommended not to install it in a metal casing.

Appendix A： Module Size

Dimension & footprint

• Dimension: 29mm 15mm 2MM (LengthWidthHeight)
• Tolerance: +/- 0.15 mm

Appendix B：Module image

Appendix C： Pin allocation

Refer to KDB 996369 D03 v01r01

List of applicable FCC rules
FCC Part 15.247

RF exposure considerations
This equipment complies with the FCC RF radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20cm between the radiator and any part of your body.

Label and compliance information
FCC ID label on the final system must be labeled with “Contains FCC ID:
2BFND-CM21-V20” or “Contains transmitter module FCC ID: 2BFND-CM21-V20”.

Information on test modes and additional testing requirements
Contact Foshan STEPON Technology Co., Ltd will provide stand-alone modular transmitter test mode. Additional testing and certification may be necessary when multiple modules are used in a host.

Additional testing, Part 15 Subpart B disclaimer
To ensure compliance with all non-transmitter functions the host manufacturer is responsible for ensuring compliance with the module(s) installed and fully operational. For example, if a host was previously authorized as an unintentional radiator under the Supplier’s Declaration of Conformity procedure without a transmitter certified module and a module is added, the host manufacturer is responsible for ensuring that the after the module is installed and operational the host continues to be compliant with the Part 15B unintentional radiator requirements. Since this may depend on the details of how the module is integrated with the host, Foshan STEPON Technology Co., Ltd shall provide guidance to the host manufacturer for compliance with the Part 15B requirements.

FCC

FCC Warning
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.

NOTE 1: Any changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

FCC Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. End users must follow the specific operating instructions for satisfying RF exposure compliance.
Note 1: This module certified that complies with RF exposure requirement under mobile or fixed condition, this module is to be installed only in mobile or fixed applications.
A mobile device is defined as a transmitting device designed to be used in other than fixed locations and to generally be used in such a way that a separation distance of at least 20 centimeters is normally maintained between the transmitter’s radiating structure(s) and the body of the user or nearby persons. Transmitting devices designed to be used by consumers or workers that can be easily re-located, such as wireless devices associated with a personal computer, are considered to be mobile devices if they meet the 20 centimeter separation requirement.
A fixed device is defined as a device is physically secured at one location and is not able to be easily moved to another location.

Note 2: Any modifications made to the module will void the Grant of Certification, this module is limited to OEM installation only and must not be sold to end-users, end-user has no manual instructions to remove or install the device, only software or operating procedure shall be placed in the end- user operating manual of final products.

1. The module is limited to OEM installation only.
2. The OEM integrator is responsible for ensuring that the end-user has no manual instructions to remove or install module.

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