Silicon Laboratories SI4421 Ficha de datos descargar pdf (Pagina 7)

Si4421

Typical Application

Typical application with FIFO usage

C3 C2

10n

10MHz

2.2u

Si4421

VDD

SCK

SDO

nIRQ

SDI

CLKin

nSEL

nFFS

FFIT

nRES

PCB

Antenna

nRESin

2.2n

CLK

(optional)*

(optional)

(optional)*

(optional)

(opt.)

(optional)

VDI

Note: * Connections needed only in time critical applications

Recommended supply decoupling capacitor values

C2 and C3 should be 0603 size ceramic capacitors to achieve the best supply decoupling.

Band [MHz] C1 C2 C3

433 2.2µF 10nF 220pF

868 2.2µF 10nF 47pF

915 2.2µF 10nF 33pF

Property C1 C2 C3

SMD size A 0603 0603

Dielectric Tantalum Ceramic Ceramic

Pin Function vs. Operation Mode

Mode Bit setting Function Pin 6 Pin 7

el = 0 Internal TX data register disabled TX data input

Transmit

el = 1 Internal TX data register enabled

nFFS input

(TX data register can be accessed)

Not used

ef = 0 Receiver FIFO disabled RX data output

RX data clock

output

Receive

ef = 1 Receiver FIFO disabled

nFFS input

(RX data FIFO can be accessed)

FFIT output

The el and ef bits can be found in the Configuration Setting Command on page 15. Bit el

enables the internal TX data register.

Bit ef enables the FIFO mode.

1 2 3 4 5 6 7 8 9 10 11 12 ... 44 45

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Silicon Laboratories SI4421 Ficha de datos Pagina 7

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