
104
42073A-MCU Wireless-02/13
ATmega2564/1284/644RFR2
transceiver. RPC is applicable to selected operating modes and is transparent to other
extended features.
To achieve the lowest possible power consumption set register TRX_RPC to 0xFF. For
disabling the Reduced Power Consumption modes set register TRX_RPC to 0xC1 or
135 for detailed description of the TRX_RPC register bits.
9.8.10.2 RPC Methods and Elements
9.8.10.2.1 PES – PLL Energy Saving
The PES mode is activated with bit PLL_RPC_EN of register TRX_RPC set to one.
Applicable to states: PLL_ON and TX_ARET_ON
A state change towards PLL_ON or TX_ARET_ON causes an initial PLL calibration run,
immediately followed by entering the PES mode. A state change towards RX or TX
states, a channel switch or PLL calibration causes a PLL wake-up. After finishing such
an operation, the PLL automatically enters the PES mode.
9.8.10.2.2 SRT – Smart Receiving Technology
The SRT mode is activated with bit RX_RPC_EN of register TRX_RPC set to one.
Applicable to states: RX_ON, RX_AACK_ON and TX_ARET_ON
SRT reduces the average power consumption during RX listening periods. In typical
environment situations SRT reduces the average current consumption of the
transceiver in the RX_ON state by up to 50%. The configuration of SRT is done with the
RX_RPC_CTRL bits of register TRX_RPC.
Notes:
1. It’s recommended to disable SRT during RSSI measurements or RND
generation.
2. During CCA or/and ED scan the SRT is disabled automatically.
3. If autonomous antenna diversity is enabled, SRT cannot achieve the maximum
effect.
4. The effective reduction of the current consumption may vary depending on
operating conditions (wireless traffic, temperature, channel noise, frequency
settings).
9.8.10.2.3 ERD – Extended Receiver Desensitizing
ATmega2564/1284/644RFR2 ERD is activated with bit PDT_RPC_EN of register
TRX_RPC set to one.
Applicable to states: RX_ON, RX_AACK_ON and TX_ARET_ON
In combination with RX_PDT_LEVEL settings, the average RX current is further
Setting RX_PDT_LEVEL = 0x08 requires special attention. In contrast to definitions in
sensitivity is reduced to -80 dBm only. However the average RX_ON current is much
lower than for comparable register settings.