Rainbow Electronics RFM12B User Manual
RFM12B
RFM12
B
UNIVERSAL ISM BAND FSK TRANSCEIVER MODULE
RFM12B
（the purpose of this spec covers mainly for the
physical characteristic of the module, for register
configure and its related command info please refer
to RF12B data sheets
）
General Introduction
RFM12B is a low costing ISM band transceiver
module implemented with unique PLL. It works
signal ranges from 433/868/915MHZ bands, comply
with FCC, ETSI regulation. The SPI interface is
used to communicate with microcontroller for
parameter setting.
Features:
• Low costing, high performance and price ratio
• Tuning free during production
• PLL and zero IF technology
• Fast PLL lock time
• High resolution PLL with 2.5 KHz step
• High data rate (up to 115.2 kbps with internal demodulator，with external RC filter highest data rate is
256 kbps)
• Differential antenna input/output
• Automatic antenna tuning
• Programmable TX frequency deviation (from 15 to 240 KHz)
• Programmable receiver bandwidth (from 67 to 400 kHz)
• Analog and digital signal strength indicator (ARSSI/DRSSI)
• Automatic frequency control (AFC)
• Data quality detection (DQD)
• Internal data filtering and clock recovery
• RX synchron pattern recognition
• SPI compatible serial control interface
• Clock and reset signal output for external MCU use
• 16 bit RX Data FIFO
• Two 8 bit TX data registers
• Standard 10 MHz crystal reference
• Wakeup timer
• 2.2V – 3.8V power supply
• Low power consumption
• Standby current less than 0.3uA
• Supports very short packets (down to 3 bytes)
Tel: +86-755-82973806 Fax: +86-755-82973550 E-mail: sales@hoperf.com
http://www.hoperf.com
RFM12B
T ypical Application：
• Remote control
• Remote sensor
• Wireless data collection
• Home security system
• Toys
• Tire pressure monitoring system
Pin Definition：
SMD DIP
definition Type Function
nINT/VDI DI/ DO Interrupt input (active low)/Valid data indicator
VDD S Positive power supply
SDI DI SPI data input
SCK DI SPI clock input
nSEL DI Chip select (active low)
SDO DO Serial data output with bus hold
nIRQ DO
FSK/DATA/nFFS DI/DO/DI Transmit FSK data input/ Received data output (FIFO not used)/ FIFO
DCLK/CFIL/FFIT DO/AIO/DO Clock output (no FIFO )/ external filter capacitor(analog mode)/ FIFO
CLK DO Clock output for external microcontroller
nRES DIO
GND S Power ground
Interrupts request output（active low）
select
interrupts(active high)when FIFO level set to 1, FIFO empty
interruption can be achieved
Reset output（active low）
Electrical Parameter：
Maximum（not at working mode）
symbol parameter minimum maximum Unit
Vdd Positive power supply -0.5 6.0 V
Vin All pin input level -0.5 Vdd+0.5 V
Tel: +86-755-82973806 Fax: +86-755-82973550 E-mail: sales@hoperf.com
http://www.hoperf.com
RFM12B
Input current except power -25 25 mA
I
in
ESD Human body model 1000 V
Tst Storage temperature -55 125
Tld Soldering temperature(10s) 260
℃
℃
Recommended working range
symbol parameter minimum maximum Unit
Vdd Positive power supply 2.2 3.8 V
Top Working temperature -40 85
℃
DC characteristic
symbol parameter Remark minimum typical maximum Unit
I
Supply current
dd_TX_0
(TX mode, P
I
dd_TX_PMAX
Supply current
(TX mode, P
I
Supply current
dd_RX
(RX mode)
= 0dBm)
out
= P
out
max
315,433MHz band
868MHz band
915MHz band
315,433MHz band
)
868MHz band
915MHz band
315,433MHz band
868MHz band
915MHz band
15
16
17
22
23
24
11
12
13
17
18
19
24
25
26
13
14
15
Ix Idle current Crystal oscillator on 0.62 1.2 mA
Ipd Sleep mode current All blocks off 0.3 uA
Ilb Low battery detection 0.5 uA
Vlb Low battery detect
0.1V per step 2.2 3.7 V
threshold
V
Low battery detection
lba
0 5 %
accuracy
Vil Low level input 0.3*Vdd V
Vih High level input 0.7*Vdd V
Iil Leakage current Vil=0V -1 1 uA
Iih Leakage current Vih=Vdd, Vdd=5.4V -1 1 uA
Vol Low level output Iol=2mA 0.4 V
Voh High level output Ioh=-2mA Vdd-0.4 V
mA
mA
mA
AC characteristic
symbol parameter remark min typical max Unit
f
PLL frequency 9 10 11 MHz
ref
f
LO
frequency
(10MHz crystal
used)
433 MHz band,2.5KHz step
868 MHz band,5KHz step
915 MHz band,7.5KHz step
430.24
860.48
900.72
439.7
5
879.5
1
929.2
7
Tel: +86-755-82973806 Fax: +86-755-82973550 E-mail: sales@hoperf.com
http://www.hoperf.com
MHz
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