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XE1202A Datasheet(PDF) 10 Page - Semtech Corporation |
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XE1202A Datasheet(HTML) 10 Page - Semtech Corporation |
10 / 32 page © Semtech 2006 www.semtech.com 11 XE1202A TrueRF™ 4.1.3 RSSI When enabled, this function provides an RSSI (Received Signal Strength Indication) based on the signal at the output of the base-band filter. To enable the RSSI function, the bit “RTParam_RSSI” should be set to “1” (see the Configuration register section below). When enabled, the status of the RSSI is a 2-bit word stored in register “DataOut_RSSI”, which can be read via the serial control interface. The contents of the register are defined in Table 6 below, where VRFFIL is the differential amplitude of the equivalent input RF signal when the receiver is operated in A-mode. The thresholds VTHRi are the thresholds at the output of the base-band filter divided by the gain between the input of the receiver and this output. DataOut_RSSI Description 0 0 VRFFIL ≤ VTHR1 0 1 VTHR1 < VRFFIL ≤ VTHR2 1 0 VTHR2 < VRFFIL ≤ VTHR3 1 1 VTHR3 < VRFFIL Table 6: RSSI status description Two ranges, each of three VTHRi thresholds are defined and selected via the setting of the register “RTParam_RSSR”, to provide an overall RSSI range of typically 25 dB. The timing diagram of an RSSI measurement is illustrated by Figure 3 below. When the RSSI function has been activated the signal strength is periodically measured and the result is stored in the register “DataOut_RSSI” at each rising edge of DATAIN. TS_RS is the wake-up time required after the function has been enabled to ensure that a valid reading of RSSI is obtained. For a proper operation, the pulse length on DATAIN has to be higher than 8µs. xxx val1 val2 val3 val4 0 val1 val4 xxx TS_RS datain RSSI_out (internal signal) /en RTParam_RSSI DtaOut_RSSI TS_RSM Figure 3: RSSI measurement timing diagram For applications where a valid RSSI reading is required within as short a time frame as possible, enabling the RSSI during receiver mode 010 instead of 100 (see the definition of TS_RS in Table 4) allows a valid RSSI within 1 ms of valid data being received. 4.1.4 Frequency Error Indicator - FEI When enabled, this function provides an indication of the frequency error of the local oscillator compared with the received carrier frequency. For guaranteed operation of the FEI function, the following two conditions should be satisfied. |
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