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SI4826 Scheda tecnica(PDF) 11 Page - Silicon Laboratories |
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SI4826 Scheda tecnica(HTML) 11 Page - Silicon Laboratories |
11 / 38 page AN602 Rev. 0.3 11 3.3. Si4822/26/40/44 Application Circuits: Slide Switch Select Band and MCU Re-define Band Property Figure 7 illustrates an Si4822/26/40/44 application circuit which uses a slide switch for band selection and enables the host MCU to re-define the band property. For the band selection method using slide switch and resistors ladder, refer to "2.2. Default Band Selection" on page 4. In this application, the user can select any default band and the MCU will re-define the band’s property according to the design requirement. The MCU can only re-define the selected band’s property, it cannot change an FM band to an AM or SW band, and vice versa. The two key points to ensure the Si4822/26/40/44 works properly are as follows: 1. No pull-up resistor is connected to pin 1 LNA_EN. 2. Pin 5 BAND is connected to slide switch. Figure 6. Si4822/26/40/44 Applications Circuit: Slide Switch Select Band and MCU Re-define Band Property FM1 (87MHz - 108MHz) FM5 (64MHz - 87MHz) AM1 (520kHz - 1710kHz) Si4822/26/40/44 FM4 (76MHz - 90MHz) SW1 (5.6MHz - 6.4MHz) SW3(6.8MHz - 7.6MHz) SW5(9.2MHz - 10.0MHz) SW7(11.45MHz - 12.25MHz) SW9 (13.4MHz - 14.2MHz) SW11 (15MHz - 15.9MHz) SW13 (17.1MHz - 18MHz) SW15 (21.2MHz - 22MHz) Si4826/44 only Si4826/44 only FM/SW Optional To host MCU To host MCU (For Si4822/26, pin23 is NC) (For Si4822/26, pin24 is AOUT) 12 3 4 5 6 7 8 9 10 11 12 13 S2 R15 20k 1% R10 20k 1% R12 20k 1% R11 20k 1% R14 20k 1% R9 20k 1% R7 20k 1% R8 50k 1% R28 40k 1% R29 120k 1% L2 270nH C19 0.1u C15 4.7u VR1 100k 10% C6 0.1u R6 100k C5 0.47u Q1 2SC9018 R31 1k R32 10R C30 33n C33 10p R41 120k C31 33n B6 2.5k/100M C36 0.47u R34 100k C34 33p C1 0.1u R27 100R R33 20k 1% R35 20k 1% R36 33k 1% C13 47u R43 30k 1% R44 47k 1% C4 4.7u C7 4.7u Y1 32.768KHz C28 22p C29 22p R3 10k ANT2 BAND [1] LNA_EN [1] LNA_EN [1] TUNE1 [1] TUNE1 [1] RESET VCC IRQ SCLK SDIO LOUT ROUT |
Codice articolo simile - SI4826 |
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Descrizione simile - SI4826 |
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