XE1203F
Depending on the ConfigSwitch 1-bit Register or the input level at the SWITCH pin, the XE1203F transceiver will
use either the SWParam configuration set#1 or the set #2. If the RTParam_Switch_ext configuration parameter is
low, then the SWParam configuration set is selected by the ConfigSwitch parameter – set#1 if ConfigSwitch is “0”,
set#2 if ConfigSwitch is “1”. If the RTParam_Switch_ext configuration parameter is high, then the SWParam
configuration set is selected by the SWITCH pin – set#1 if SWITCH is low, set#2 if SWITCH is high.
Table 10 below summarizes the chip configuration programming:
ConfigSwitch
Register
0
SWITCH pin
SWITCH is an output:
‘1’ in transmitter mode
‘0’ in the other modes
RTParam_switch_ext
configuration parameter
0
SWParam configuration
set selected
Set #1:
SWParam_mode_1
SWParam_Power_1
SWParam_Rmode_1
SWParam_t_delsig_in_1
SWParam_freq_1
1
SWITCH is an output:
‘1’ in transmitter mode
‘0’ in the other modes
0
Set #2:
SWParam_mode_2
SWParam_Power_2
SWParam_Rmode_2
SWParam_t_delsig_in_2
SWParam_freq_2
X
0
1
Set #1:
SWParam_mode_1
SWParam_Power_1
SWParam_Rmode_1
SWParam_t_delsig_in_1
SWParam_freq_1
X
1
1
Set #2:
SWParam_mode_2
SWParam_Power_2
SWParam_Rmode_2
SWParam_t_delsig_in_2
SWParam_freq_2
Table 10: ConfigSwitch, SWITCH pin and SWParam Configuration Register
By default the configuration set#1 is used and register RTParam_switch_ext is set to ‘0’.
Note that a new value of the ConfigSwitch register or at the SWITCH pin should be modified when the EN signal is
low. The actual switch to the newly selected set of SWParam register will be applied to the transceiver on the next
rising edge of the EN signal.
? Semtech 2008
21
www.semtech.com
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