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RFM22B/23B
RFM22B/23B ISM TRANSCEIVER MODULE
Fe
atures
Applic
ations
Desc
ription
HopeRF's RFM22B/23B are
highly integrated, low cost,433/868/915MHZ
wireless ISM transceivers module.
The low receive sensitivity
coupled with industry leading +20dBm output power ensures
range and improved link performance. Built-in antenna diversity and
support for frequency hopping can be used to further extend range and enhance
performance.
Additional system features such as an automatic wake-up timer, low
battery detector, 64 byte TX/RX FIFOs, automatic packet handling, and preamble
detection reduce overall current consumption and allow the use of lower-cost
system MCUs. An integrated temperature sensor, general purpose ADC, power-
on-reset (POR), and GPIOs further reduce overall system cost and size.
The RFM22B/23B’s digital receive architecture features a high-performance ADC
and DSP based modem which performs demodulation, filtering, and packet
handling for increased flexibility and performance. The direct digital transmit
modulation and automatic PA power ramping ensure precise transmit modulation
and reduced spectral spreading ensuring compliance with global regulations
including FCC, ETSI.
An easy-to-use calculator is provided to quickly configure the radio settings,
simplifying customer's system design and reducing time to market.
Frequency Range
433/868/915MHz ISM bands
Sensitivity = –121 dBm
Ou
tput power range
+20
dBm Max (RFM22B)
+13
dBm Max (RFM23B)
Low
Power Consumption
18.5
mA receive
30
mA @ +13 dBm transmit
85
mA @ +20 dBm transmit
Dat
a Rate = 0.123 to 256 kbps
FSK, GFSK, and OOK modulation
Power Supp
ly = 1.8 to 3.6 V
Ultra low po
wer shutdown mode
Digital RSSI
W
ake-up timer
Au
to-frequency calibration (AFC)
Power-on-reset (POR)
Antenna diversity and TR switch
control
C
onfigurable packet handler
Preamble detector
T
X and RX 64 byte FIFOs
Lo
w battery detector
Temperature sensor and 8-bit ADC
–
40 to +85 °C temperature range
Integ
rated voltage regulators
Frequency hopping capability
On-chi
p crystal tuning
14-PIN DIP & 16-PIN SMD p
ackage
Low cost
Remote control
Home security &
alarm
Telemetry
Persona
l data logging
T
oy control
Tire pressure monitoring
Wire
less PC peripherals
Remote meter r
eading
Remote keyless
entry
Home automation
Industrial
control
Senso
r networks
Health monitors
T
ag readers
RFM22B/23B
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com
V1.0
1
(–121dBm)
extended
RFM22B/23B
2
TABLE OF CONTENTS
Section Page
1. Electrical Specifications . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
2.1. Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3. Controller Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3.1. Serial Peripheral Interface (SPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3.2. Operating Mode Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
3.3. Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
3.4. System Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
3.5. Frequency Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
4. Modulation Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
4.1. Modulation Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
4.2. Modulation Data Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
5. Internal Functional Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.1. RX LNA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
5.2. RX I-Q Mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
5.3. Programmable Gain Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
5.4. ADC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
5.5. Digital Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
5.6. Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
5.7. Power Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
5.8. Crystal Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
5.9. Regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
6. Data Handling and Packet Handler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
6.1. RX and TX FIFOs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
6.2. Packet Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
6.3. Packet Handler TX Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
6.4. Packet Handler RX Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
6.5. Data Whitening, Manchester Encoding, and CRC . . . . . . . . . . . . . . . . . . . . . . . . . .42
6.6. Preamble Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
6.7. Preamble Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
6.8. Invalid Preamble Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
6.9. Synchronization Word Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
6.10. Receive Header Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
6.11. TX Retransmission and Auto TX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
7. RX Modem Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
7.1. Modem Settings for FSK and GFSK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
8. Auxiliary Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
8.1. Smart Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com
RFM22B/23B
3
8.2. Microcontroller Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
8.3. General Purpose ADC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
8.4. Temperature Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
8.5. Low Battery Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
8.6. Wake-Up Timer and 32 kHz Clock Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
8.7. Low Duty Cycle Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
8.8. GPIO Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
8.9. Antenna Diversity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
8.10. RSSI and Clear Channel Assessment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
9. Reference Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
10. Register Table and Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . .59
11. Pin Descriptions: RFM22B/23B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
12. Mechanical Dimension:RFM22B/23B
. . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
13. Ordering Information .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com
Contact Information
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
. . . . . . . . . . . .
RFM22B/23B
4
1. Electrical S
pecifications
T
able 1. DC Characteristics
Pa
rameter Symbol Conditions Min Typ Max Units
Supply Voltage Range V
DD
1.8 3.0 3.6 V
Power Saving Modes I
Shutdown
RC Oscil
lator, Main Digital Regulator,
and Low Power Digital Regulator OFF
—15 50 nA
I
S
tandby
Low Power Digital Regulator ON (Register values retained)
and Main Digital Regulator, and RC Oscillator OFF
— 450 800 nA
I
Sleep
RC Osci
llator and Low Power Digital Regulator ON
(Register values retained) and Main Digital Regulator OFF
—1 —µA
I
Sen
sor-LBD
Main Digital Regulator and Low Battery Detector ON,
Crystal Oscillator and all other blocks OFF
—1 —µA
I
Sensor-TS
Main
Digital Regulator and Temperature Sensor ON,
Crystal Oscillator and all other blocks OFF
—1 —µA
I
Re
ady
Cryst
al Oscillator and Main Digital Regulator ON,
all other blocks OFF. Crystal Oscillator buffer disabled
— 800 — µA
TUNE Mode Current I
Tu
ne
Syn
thesizer and regulators enabled — 8.5 — mA
RX Mode Current I
RX
—1
8.5 — mA
TX Mode Current
—RFM22B
I
TX_+20
txpo
w[2:0] = 111 (+20 dBm)
—85 — mA
TX Mode Current
—RFM23B
I
TX_+13
txpow[2:0]
= 110 (+13 dBm)
—30 — mA
I
TX_+1
txpow[2:0] =
001 (+1 dBm)
—18 — mA
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com
5
Table 2. Synthesizer AC Electrical Characteristics
Pa
rameter Symbol Conditions Min Typ Max Units
Synthesizer Frequency
Range—RFM22B/23B
F
SYN
848
888 MHz
Synthesizer Frequency
Resolution
F
RES-LB
433MHz Band
— 156.25 — Hz
F
RES
-HB
868/915MHz Ban
d — 312.5 — Hz
Reference Frequency
Input Level
f
REF_L
V
Wh
en using external reference signal
driving XOUT pin, instead of using
crystal. Measured peak-to-peak (V
PP
)
0.7
— 1.6 V
Synthesizer Settling Time t
LOCK
M
easured from exiting Ready mode with
XOSC running to any frequency.
Including VCO Calibration.
—200— µs
Residual FM F
RMS
In
tegrated over 250 kHz bandwidth
(500 Hz lower bound of integration)
—2 4kHz
RM
S
Ph
ase Noise L(f
M
) F
= 10 kHz — –80 — dBc/Hz
F = 100 kHz — –90 — dBc/Hz
F = 1 MHz — –115 — dBc/Hz
F = 10 MHz — –130 — dBc/Hz
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com
RFM22B/23B
41
3 453 MHz
901 929 MHz
433MHz band
868MHz band
915MHz band
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