RFM31B-868-S1 QUASAR, RFM31B-868-S1 Datasheet - Page 11

• Manufacturer Part Number: RFM31B-868-S1
• Description: MODULE, RECEIVER, -118DB, SMD,868MHZ
• Manufacturer: QUASAR

Specifications of RFM31B-868-S1

• Modulation Type: FSK, GFSK, OOK
• Sensitivity: -121dBm
• Power Supply: 1.8V To 3.6V
• Supply Current: 18.5mA
• Data Rate Max: 256Kbps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.1. Operating Modes
The RFM31B 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.
Table8 summarizes the operating modes of the RFM31B. 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 operating mode. 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.
SHUTDOWN
Mode Name
Tel: [phone]
STANDBY
RECEIVE
SENSOR
TUNING
READY
SLEEP
(Register contents
(Register contents
Digital LDO
retained)
OFF
lost)
ON
Fax: [phone]
Table 8. Operating Modes
OFF
SPI
ON
ON
ON
ON
ON
ON
32 kHz OSC
Circuit Blocks
OFF
OFF
E-mail: [e-mail] http://www.hoperf.com
ON
X
X
X
X
AUX
OFF
OFF
ON
X
X
X
X
30 MHz
XTAL
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
PLL
ON
ON
RFM31B
OFF
OFF
OFF
OFF
OFF
OFF
ON
RX
18.5 mA
800 µA
450 nA
8.5 mA
15 nA
1 µA
1 µA
I
VDD
11