XE1203I063 Ver la hoja de datos (PDF) - Unspecified

Número de pieza

componentes Descripción

Fabricante

XE1203I063

433MHz / 868MHz / 915MHz Low-power, integrated UHF transceiver

Unspecified 

Data Sheet

XE1203

Saout_rssi is internally generated signal during a read sequence of DATAOUT_RSSI register and used for

updating Dataout_RSSI register. The next figure shows the timing diagram of the saout_rssi generation.

SCK

SI

EN

SO

HZ

saout_rssi

A4 A3 A2 A1 A0

D7 D6 D5 D4 D3 D2 D1 D0

HZ

Figure 7. Generation of saout_rssi

The maximum frequency of SCK during the read operation of the RSSI value is 100 KHz.

4.1.10 Frequency Error Indicator - FEI

This function provides information about the frequency error of the local oscillator compared with the input carrier

frequency and can be used to implement AFC. The condition on the modulation index for proper behaviour of the

FEI function is:

β

=

2⋅∆f

BR

≥ 2,

where ∆f is the frequency deviation and BR is the bit rate.

IMPORTANT NOTE

The time diagram of an FEI measurement is given in the next figure. When the FEI block has been woken up and

is ready, and as long as the block is kept on, the frequency error is measured and the current result of the

measurement is loaded in the register “Dataout_MSB_fei” and “Dataout_LSB_fei ‘’ each time the

“Dataout_LSB_fei ‘’ register is read. TS_FEI is the time required for the first evaluation to be completed after the

block has been started up and its value is given in section 3.2. Since the contents of the configuration register is

validated at the rising edge of the enable signal “en”, the FEI block is actually started up at this time.

14

D0308-214

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