Ver.1.1
11
4.
Low Power Stand-by Mode
This mode realizes low power consumption drive by switching ON and Off of RF circuit. It is possible to set
this low power stand-by mode by the memory register (REG21: bit 2) or the command. If this mode is set by
the command, this mode is released by the main power OFF or by set to power down mode.
4.1 Operation
Flow
By repeating “stand-by mode” and “sleep mode”, the power consumption at the RF circuit is reduced. Duration
of the “stand-by mode” and “sleep mode” can be set by REG22 and REG25, respectively.
If the FDP02 receives data that destination address is matched and REG18 (address check) is set to “
Enabling
destination address check at reception”
, the duration of the “stand-by mode” is extended. The extended time
duration is set by REG21 or command setting. When the FDP02 cannot receive next data packet during the
extended stand-by time, it becomes “sleep mode”.
If the data packet is sent by broadcasting mode and/or the REG18
setting is “
Disabling group address check at reception”, the FDP02 does not
turn to the “Extended Stand-by mode” even if the extended time duration is set
by REG21.
4.2 Setting
4.2.1
Setting by the memory register
It is possible to set “Low Power Stand-by Mode” by bit 2 of REG21. At that time, time duration of “Stand-by”
is set by REG22, that of “Sleep” is set by REG25 and that of “Extended Stand-by Time” is set by bit 4 to 7 of
REG21. For more detail, please check “Registers” section below.
4.2.2
Setting by the command
Current Consumption
Stand-By S
leep
Current Consumption
Stand-By
Sleep
FDP02 receives data packet
Extended Stand-by Time
