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CP3SP33SMS/NOPB Datasheet(PDF) 123 Page - Texas Instruments |
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CP3SP33SMS/NOPB Datasheet(HTML) 123 Page - Texas Instruments |
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123 / 407 page  VDD LMX5251 RFCE CLKIN RFDATA RFSYNC VCC CP3000 IOVCC CP3000 Low Low High Low SDAT Low SCLK Low SLE Standby LMX5251 in Normal Mode LMX5251 in Power-Up Mode LMX5251 Oscillator Start-Up LMX5251 Initialization CP3000 Initialization Active High DS333 RESET# LMX5251 RESET CP3000 t PTOR CP3SP33 www.ti.com SNOSCW5 – MAY 2013 Figure 19-9. LMX5251 Power-Up Sequence 19.4 LMX5252 Power-Up Sequence A Bluetooth system based on the CP3SP33 and LMX5252 devices has the following states: • Off—When the LMX5252 enters Off mode, all configuration data is lost. In this state, the LMX5252 drives BPOR low. • Power-Up—When the power supply is on and the LMX5252 RESET# input is high, the LMX5252 starts up its crystal oscillator and enters Power-Up mode. After the crystal oscillator is settled, the LMX5252 sends four clock cycles on BRCLK (CLKIN) before driving BPOR high. • RF Init—The baseband controller on the CP3SP33 now drives RFCE high and takes control of the crystal oscillator. The baseband performs all the needed initialization (such as writing the registers in the LMX5252 and crystal oscillator trim). • Idle—The baseband controller on the CP3SP33 drives RFDATA low when the initialization is ready. The LMX5252 is now ready to start transmitting, receiving, or enter Sleep mode. • Sleep—The LMX5252 can be forced into Sleep mode at any time by driving RFCE low. All configuration settings are kept, only the Bluetooth low power clock is running (B3k2). • Wait XTL—When RFCE goes high, the crystal oscillator becomes operational. When it is stable, the LMX5252 enters Idle mode and drives BRCLK (CLKIN). Copyright © 2013, Texas Instruments Incorporated Bluetooth Controller 123 Submit Documentation Feedback Product Folder Links :CP3SP33 |
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