XE1203 ETC1 [List of Unclassifed Manufacturers], XE1203 Datasheet - Page 13

• Manufacturer Part Number: XE1203
• Description: Low-Power, integrated UHF transceiver
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

4.1.8
The receiver can be operated in two different modes that provide the highest sensitivity or the highest linearity. Two
operating mode is selectable via the registers “
register section). In A-mode, the receiver has the highest sensitivity (see RFS parameter) and in B-mode, the
receiver has the highest linearity (see IIP3 parameter)
4.1.9
This function provides a Received Signal Strength Indication based on the signal level at the output of the base-
band filter. To activate this function, the bit “RTParam_RSSI” (see the Configuration register section) must be set to
“1”. When activated, the 2-bits status information is stored in register “DataOut_RSSI” and can be read through the
serial control interface. The meaning of this status information is given in the table below, where V
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.
The operating range of RSSI measurement can be changed by programming RTParam_RSSIR register, this way
two ranges with three VTHRi values can be selected. The time diagram of an RSSI measurement is given in the
next figure. When the RSSI function has been activated the signal strength is periodically measured and the result
is stored in the register “DataOut_RSSI” each time “DataOut_RSSI” is read via the 3 wires interface. TS_RS is the
wake-up time required after the function has been activated to get a valid result.
13
en
rssi_out
saout_rssi
dataout_rssi
RTParam_Rssi
High sensitivity vs. high linearity: A-mode, B-mode
RSSI
DataOut_RSSI
xxx
TS_RSSI
xxx
0 0
0 1
1 0
1 1
Figure 6. RSSI measurement timing diagram
Table 1 RSSI status description
val1
Description
V
VTHR1 < V
VTHR2 < V
VTHR3 < V
SWParam_Rmode1
RFFIL
val2
VTHR1
RFFIL
RFFIL
RFFIL
val1
VTHR2
VTHR3
” or “
val3
SWParam_Rmode2
val4
Data Sheet
XE1203
” (see the Configuration
val4
D0308-214
val5
0
RFFIL
is the