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SPBT2563C1 Datasheet(PDF) 10 Page - STMicroelectronics |
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SPBT2563C1 Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 13 page ![]() 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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