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SPBT2563C1 Datasheet(PDF) 10 Page - STMicroelectronics

Part # SPBT2563C1
Description  Bluetooth??class 1 module
Download  13 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SPBT2563C1 Datasheet(HTML) 10 Page - STMicroelectronics

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Obsolete
Product(s)
- Obsolete
Product(s)
Application
SPBT2563C1
10/13
8
Application
8.1
Low-power improvements
In low power modes,due to the oscillators continuously runnig, the module current is
roughly 2.5 mA ( measured at pin 12).
This current consumption can be drastically improved by switching off the two oscillators
during low power phases.
This can be done by means of Inhibit function (pin 3) which act directly on the internal
power supply regulator ; in this mode the module is no more powered and the current
consumption becomes < 1
µA instead of 2.5mA.
8.2
Low power clock startup time
Due to 32.768 Khz oscillator stabilization , when the module is powered on or when
enabled ( Inhibit from Low to High state) a waiting time of at least 500ms must be
observed ( Reset signal could be kept Low for the waiting1 time or given after it).
8.3
PCB layout of the antenna output
The microstrip track connected to the antenna (pin 1) should respect a characteristic
impedance of 50
Ω. It should be verified particularly if some variations in the final project:
dielectric material, tolerances, layout changes.
The RF ground island around the antenna is connected only to G1 and G2 pins of the
module. This ground island is isolated from other grounds. The ground plane at lower PCB
layer should also be isolated from other grounds.
Vias every 5 millimeters should connect together RF ground islands of each layer.
Figure 3.
Layout of the RF track to antenna pin of SPBT2563C1
1
G1
G2
2
3
4
Isolated RF GND
connected to G1 and G2
1
G1
G2
2
3
4
Isolated RF GND
connected to G1 and G2


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