4. Card reader, Bluetooth dialer, Bluetooth companion and other products
4. Module product specifications
Bluetooth version: Bluetooth V5.0+BR+EDR
Modulation method: GFSK,
π
/4-DQPSK
Support: HFP/HSP, OPP., A2DP/AVRCP, PBAP profiles
Sensitivity: (0.1% BER) -82dBm
Transmit power: meet the requirements of class2 and class3 transmit power, and can provide a
maximum transmit power of +7dbm
Power supply voltage: 3.2V-4.2V
Power consumption current: normal working current 45mA, 32mA when playback is paused
Signal to noise ratio: 70dB
Resolution: 50dB
Temperature range: -40
º
C to +50
º
C
Frequency range: 2.4GHz-2.4835GHz
5. Precautions
A. Regarding the use environment of wireless Bluetooth, wireless signals, including Bluetooth
applications, are greatly affected by the surrounding environment. Obstacles such as trees and
metals will absorb the wireless signal. Therefore, in actual applications, data transmission is The
distance is affected to a certain extent.
B. Because the Bluetooth module must be matched with the existing system, it is placed in the
shell. Because the metal shell has a shielding effect on the radio frequency signal. Therefore, it is
not recommended to install in a metal enclosure.
C. PCB layout: The antenna part of the Bluetooth module is a PCB antenna. Metal will weaken the
function of the antenna. When laying the module, it is strictly forbidden to pave the ground and
wire under the module antenna. It is better if it can be hollowed out.
D. The antenna should not be too close to metal objects, such as batteries, chips, and should not
overlap with metal objects. The antenna of the module should be placed on the edge of the
motherboard.
