SPBT2532C2.AT2 STMicroelectronics, SPBT2532C2.AT2 Datasheet - Page 22

• Manufacturer Part Number: SPBT2532C2.AT2
• Description: Bluetooth / 802.15.1 Modules Bluetooth V2.1 Mod Class2 SPP AT Rev2
• Manufacturer: STMicroelectronics

Specifications of SPBT2532C2.AT2

• Rohs: yes
• Class: 2
• Frequency Band: 2.4 GHz
• Sensitivity: - 85 dBm
• Data Rate: 2 Mbps
• Operating Supply Voltage: - 0.3 V to + 5 V
• Interface Type: UART
• Maximum Operating Temperature: + 55 C
• Dimensions: 10.5 mm x 13.5 mm

Application information
8.2
8.3
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Antenna coupling
Despite the type of antenna chosen, the connection between the RF out pin and the
antenna must be realized to get the maximum power transfer.
As a general rule, the characteristic impedance (Z0) of the connection must be fixed at the
value of 50 Ω . The connection trace must be matched to respect such a condition.
50 Ω¸ matching depends on various factors and elements that must be taken into
consideration:
●
●
●
Example of trace calculation
Example of strip line calculation:
●
Tools for calculating the characteristic impedance, based on the physical and mechanical
characteristics of the PCB, can be easily found online.
Figure 13. Parameters for trace matching
Type of material, i.e. FR4 or others
The electrical characteristics of the material, among them the electric constant,
2.4 GHz
PCB and traces mechanical dimensions:
–
–
–
–
To get a strip line of 50 Ω , using a 1 mm thick FR4 board, with an
with Cu thickness of 41 µm, the strip line width must be 1.9 mm (micro strip type
calculation).
PCB thickness
Reference ground thickness
Trace width
Trace thickness.
Doc ID 023461 Rev 1
ε
r = 4.3 at 2.4 GHz,
SPBT2532C2.AT2
ε
r, at