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SX1235 Datasheet(PDF) 85 Page - Semtech Corporation |
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SX1235 Datasheet(HTML) 85 Page - Semtech Corporation |
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85 / 104 page  www.semtech.com Page 85 SX1235 WIRELESS & SENSING DATASHEET Rev 1 - December 2012 7. Application Information 7.1. Crystal Resonator Specification Table 34 shows the crystal resonator specification for the crystal reference oscillator circuit of the SX1235. This specification covers the full range of operation of the SX1235 and is employed in the reference design. Table 34 Crystal Specification Notes - the initial frequency tolerance, temperature stability and ageing performance should be chosen in accordance with the target operating temperature range and the receiver bandwidth selected. - the loading capacitance should be applied externally, and adapted to the actual Cload specification of the XTAL. 7.2. Reset of the Chip A power-on reset of the SX1235 is triggered at power up. Additionally, a manual reset can be issued by controlling pin 6. 7.2.1. POR If the application requires the disconnection of VDD from the SX1235, despite of the extremely low Sleep Mode current, the user should wait for 10 ms from of the end of the POR cycle before commencing communications over the SPI bus. Pin 6 (Reset) should be left floating during the POR sequence. Figure 41. POR Timing Diagram Please note that any CLKOUT activity can also be used to detect that the chip is ready. Symbol Description Conditions Min Typ Max Unit FXOSC XTAL Frequency - 32 - MHz RS XTAL Serial Resistance - 30 140 ohms C0 XTAL Shunt Capacitance - 2.8 7 pF CFOOT External Foot Capacitance On each pin XTA and XTB 8 15 22 pF CLOAD Crystal Load Capacitance 6 - 12 pF Wait for 10 ms VDD Pin 6 (output) Chip is ready from this point on Undefined |
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