AT86RF212 Atmel Corporation, AT86RF212 Datasheet - Page 24

• Manufacturer Part Number: AT86RF212
• Manufacturer: Atmel Corporation

Specifications of AT86RF212

• Max. Operating Frequency: 0 MHz
• Crypto Engine: AES
• Operating Voltage (vcc): 1.8 to 3.6
• Frequency Band: 700/800/900MHz
• Max Data Rate (mb/s): 1
• Antenna Diversity: No
• External Pa Control: Yes
• Power Output (dbm): 10
• Receiver Sensitivity (dbm): -110
• Receive Current Consumption (ma): 9.0
• Transmit Current Consumption (ma): 18 at 5dBm
• Link Budget (dbm): 120

SLEEP state
The SLEEP state is used when radio transceiver functionality is not required, and thus
the AT86RF212 can be powered down to reduce the overall power consumption.
A power-down scenario is shown in Figure 4-15. When the radio transceiver is in
TRX_OFF state, the microcontroller forces the AT86RF212 to SLEEP by setting
SLP_TR = H. If pin 17 (CLKM) provides a clock to the microcontroller, this clock is
switched off after 35 clock cycles. This enables a microcontroller in a synchronous
system to complete its power-down routine and prevent deadlock situations. The
AT86RF212 awakes when the microcontroller releases pin SLP_TR. This concept
provides the lowest possible power consumption.
The CLKM clock frequency settings for CLKM_CTRL values 6 and 7 are not intended to
directly clock the microcontroller. When using these clock rates, CLKM is turned off
immediately when entering SLEEP state.
Figure 4-15. Sleep and Wake-up Initiated by Asynchronous Microcontroller Timer
Note:
Timing figure t
refers to Table 5-1.
TR2
RX_ON and RX_AACK_ON states
For synchronous systems where CLKM is used as a microcontroller clock source and
the SPI master clock (SCLK) is directly derived from CLKM, the AT86RF212 supports
an additional power-down mode for receive operating states (RX_ON and
RX_AACK_ON).
If an incoming frame is expected and no other applications are running on the
microcontroller, it can be powered down without missing incoming frames. This can be
achieved by a rising edge on pin SLP_TR that turns CLKM off. Then the radio
transceiver state changes from RX_ON or RX_AACK_ON (Extended Operating Mode)
to RX_ON_NOCLK or RX_AACK_ON_NOCLK, respectively. In case that a frame is
received (e.g. indicated by an IRQ_2 (RX_START) interrupt), the clock output CLKM is
automatically switched on again. This scenario is shown in Figure 4-16. In RX_ON
state, the clock at pin 17 (CLKM) is switched off after 35 clock cycles when setting the
pin SLP_TR = H.
The CLKM clock frequency settings for CLKM_CTRL values 6 and 7 are not intended to
directly clock the microcontroller. When using these clock rates, CLKM is turned off
immediately when entering RX_ON_NOCLK or RX_AACK_ON_NOCLK.
In states RX_(AACK)_ON_NOCLK and RX_(AACK)_ON, the radio transceiver current
consumptions
are equivalent.
However,
the RX_(AACK)_ON_NOCLK current
consumption is reduced by the current required for driving pin 17 (CLKM).
AT86RF212
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8168C-MCU Wireless-02/10