XE1203F データシートの表示（PDF） - Semtech Corporation

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XE1203F

433 MHz / 868 MHz / 915 MHz Low-Power, Integrated UHF Transceiver

Semtech Corporation 

XE1203F

Figure 10: Data exchange during reception mode with Barker the feature enabled

When using the Barker encoding in transmitter mode, the RTParam_Barker parameter is set to “1” and the

baseband data at 1154 bit/s is applied through either the DATA or DATAIN depending to the status of

ADParam_disable_data_bidir. The data is spread into an encoded chip stream at 12.7 kcps by the Barker encoder.

This chip stream is directly applied to the frequency synthesizer without any pre-filtering.

When using the Barker coder/decoder feature in transmission mode, the DCLK pin is used to synchronize the data

coming from a microcontroller or another source. This DCLK clock is generated by the XE1203F. At the falling edge

of the each clock a new data bit (on DATA or DATAIN) should be supplied by the microcontroller or another source.

This data is sampled by the XE1203F at the next rising edge of DCLK. It is then spread by using an 11-bit length

Barker code. The Figure 11 shows the data exchange during the transmission mode when the Barker feature is

enabled.

dclk

@1154 Hz

information data

from a microcontroller

bit0

bit rate = 1154 bps

bit1

bit2

bit3

bit4

bit5

bit6

Spread data

@12.7 Kchps

spread

bit0

spread spread

bit1

bit2

spread

bit3

spread

bit4

spread

bit5

Figure 11: Data exchange during transmission mode with the Barker feature enabled

© Semtech 2007

www.semtech.com

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