RFM22B Datasheet, PDF (13/70 Pages) List of Unclassifed Manufacturers – ISM TRANSCEIVER MODULE

RFM22B/23B
2.1. Operating Modes
The RFM22B/23B provides several operating modes which can be used to optimize the power consumption for a
given application. Depending upon the system communication protocol, an optimal trade-off between the radio
wake time and power consumption can be achieved.
Table 9 summarizes the operating modes of the RFM22B/23B. In general, any given operating mode may be
classified as an active mode or a power saving mode. The table indicates which block(s) are enabled (active) in
each corresponding mode. With the exception of the SHUTDOWN mode, all can be dynamically selected by
sending the appropriate commands over the SPI. An “X” in any cell means that, in the given mode of operation,
that block can be independently programmed to be either ON or OFF, without noticeably impacting the current
consumption. The SPI circuit block includes the SPI interface hardware and the device register space. The 32 kHz
OSC block includes the 32.768 kHz RC oscillator or 32.768 kHz crystal oscillator and wake-up timer. AUX
(Auxiliary Blocks) includes the temperature sensor, general purpose ADC, and low-battery detector.
Table 9. Operating Modes
Mode
Name
Digital LDO
SHUT- OFF (Register
DOWN contents lost)
STANDBY
SLEEP
SENSOR
ON (Register
contents
retained)
READY
TUNING
SPI
OFF
ON
ON
ON
ON
ON
Circuit Blocks
32 kHz OSC AUX
30 MHz
XTAL
OFF
OFF
OFF
OFF
ON
X
X
X
OFF
X
ON
X
X
OFF
OFF
OFF
ON
ON
PLL PA
RX
I_VDD
OFF OFF OFF 15 nA
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
450 nA
1 µA
1 µA
800 µA
8.5 mA
TRANSMIT
ON
X
X
ON
RECEIVE
ON
X
X
ON
*Note: Using RFM23B at +13 dBm using recommended reference design.
ON ON OFF 30 mA*
ON OFF ON 18.5 mA
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