XE1202I027 Просмотр технического описания (PDF) - Unspecified

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XE1202I027

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

Unspecified 

Data Sheet

XE1202

The threshold fERR = FERR * BR, where BR is the bit rate and FERR is a ratio given in the electrical specifications.

As an example, for a bit rate of 4.8 kb/s and with FERR = 0.5, fERR is 2.4 kHz.

This FEI function works properly only if the input signal is the preamble defined under the Receiver section above

and if the frequency error to be detected is lower than 20 kHz.

The time diagram of an FEI measurement is quite similar to the one of an RSSI measurement, and is given in the

figure below. When the FEI is activated the frequency error is periodically measured and the result is stored in the

register “DataOut_FEI” at each rising edge of DATAIN. TS_FE is the wake-up time required after the function has

been activated to get a valid result.

RTParam_FEI

en

fei_out

XX

VAL1

VAL2

VAL3

VAL4

XX

datain

DataOut_FEI

XX

VAL2

VAL4

TS_FE

Figure 2 FEI measurement time diagram, RTParam_Fsel = 1

4.1.4.2 “RTParam_Fsel” = 0

To activate the FEI function, the bit “RTParam_FEI” must be set to “1”. When activated by the rising edge of

DATAIN, the function provides an 8-bits status stored in register “DataOut_FEI”. The timing diagram of this FEI

measurement is described in the in figure below. The FEI function is activated at the rising edge of the EN signal

when the RTParam_FEI bit is set to “1”. Then, an internal FEI counter is activated at the rising edge of DATAIN.

After duration TS_FE (see Electrical Specifications), the counter is stopped and its content is stored in the register

DataOut_FEI. The maximum delay between the rising edge of DATAIN and the first clock on the internal FEI

counter is 1/(16*BR), where BR is the bit rate.

10

D0211-105

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