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)

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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

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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

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MHz

RFM12B

fLO

frequency
(9MHZ crystal
used)

433 MHz band,2.5KHz step
868 MHz band,5KHz step
915 MHz band,7.5KHz step

387.22

774.43

810.65

395.7
6

791.5

MHz

6

836.3
4

f

LO

frequency
(11MHZ crystal
used)

433 MHz band,2.5KHz step
868 MHz band,5KHz step
915 MHz band,7.5KHz step

473.26

946.53

990.79

483.7
3

967.4

MHz

6

1022.
2

BW Receiver

bandwidth

t

PLL lock time After 10MHz step hopping, frequency

lock

mode 0
mode 1
mode 2
mode 3
mode 4
mode 5

60
120
180
240
300
360

67
134
200
270
350
400

75
150
225
300
375
450

30 us

KHz

error <10 kHz

tst, P

PLL startup time

With a running crystal
oscillator

200 300 us

BR Data rate With internal digital demodulator 0.6 115.2 kbps
BRA Data rate With exter nal RC filter 256 kbps

P

min

AFC

sensitivity

AFC working

range

range

BER 10-3, BW=134KHz,BR=1.2kbps, 433MHz band

BER 10-3, BW=134KHz,BR=1.2kbps, 868MHz band

BER 10-3, BW=134KHz,BR=1.2kbps, 915MHz band

df

: FSK deviation in the received

FSK

signal

-109 -100

-105 -100

dBm

-105 -100

0.8*
df

FSK

RSA RSSI accuracy ±5 dB
RSR RSSI range 46 dB
C

ARSSI filter 1 nF

ARSSI

RS

STEP

RSSI

6 dB
programmable
step

RS

DRSSI response

RESP

time

RSSI output high after valid ,

CARRSI=5nF

500 us

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RFM12B

AC characteristic(Transmitter)

symbol parameter remark min typical max Unit

P

max

Max. available output power

433MHz band 3 5
868MHz band 2 4

dBm

915MHz band 2 4

P

Typical output power Selectable in 3 dB

out

P

-21 P

max

dbm

max

steps

Co Output capacitance

(set by the automatic antenna

In low bands
In high bands

2

2.1

2.6

2.7

3.2

3.3

pf

tuning circuit)

Qo Quality factor of the output

capacitance

L

Output phase noise 100 kHz from carrier

out

BRTX FSK bit rate Via internal TX data

In low bands
In high bands

1 MHz from carrier

13
8

-80

15
10

17
12

-103

dbc/HZ

172 kbps

register

BRATX FSK bit rate

df

FSK frequency deviation Programmable in 15

fsk

TX data connected to the
FSK input

256 kbps

15 240 kHZ

kHz steps

AC characteristic(Turn-on/Turnaround timings)

symbol parameter remark min typical max Unit

Tst Crystal oscillator

startup time

Transmitter turn-on

T

tx_XTAL_ON

time
Receiver turn-on time Synthesizer off, crystal

T

rx_XTAL_ON

Transmitter –

T

tx_rx_SYNT_ON

Receiver turnover time

Receiver –

T

rx_tx_SYNT_ON

Transmitter turnover
time

Cxl Crystal load

capacitance

t

Internal POR timeout After Vdd has reached 90% of

POR

t

Wake-up timer clock

PBt

period

C

Digital input apacitance 2 pf

in, D

t

r, f

Digital output rise/fall time

Crystal ESR < 100 1 5 ms

Synthesizer off, crystal
oscillator on with 10 MHz step

oscillator on with 10 MHz step

250 us

250 us

Synthesizer and crystal
oscillator on during TX/RX
change with 10 MHz step

150 us

Synthesizer and crystal
oscillator on during RX/TX
change with 10 MHz step

Programmable in 0.5 pF steps,

150 us

8.5 16 pf

tolerance+/- 10%

100 ms
final value
Calibrated every 30 seconds 0.96 1.05 ms

15pF pure capacitive load 10 ns

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RFM12B

Field testing range

Band Test condition Distance

433MHz band Receiver bandwidth =67KHz, data rate=1.2kbps, transmitter frequency

deviation =45KHZ（matches with RFM12）In free open area

868MHz band Receiver bandwidth=67KHz,data rate =1.2kbps,Transmitter frequency

deviation =45KHZ（matches with RFM12）in free open area

915MHz band Receiver bandwidth=67KHz,data rate =1.2kbps,Transmitter frequency

deviation =45KHZ（matches with RFM12）in free open area

>150M

>200M

>200M

SGS Reports

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RFM12B

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RFM12B

Mechanical Dimension

（units in mm）

SMD PACKAGE（S1）

SMD PACKAGE（S2）

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RFM12B

DIP PACKAGE（D）

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RFM12B

Module Model Definition

model=module-operation_band-package_type

RFM12B – 433-D

module type operation band Package

example：1，RFM12B module at 433MHz band, DIP : RFM12B-433-D。
2，RFM12B mod ule at 868MHZ band, SMD, thickness at 4.2mm: RFM12B-868-S1。

This document may contain preliminary information and is subject to
change by Hope Microelectronics without notice. Hope
Microelectronics assumes no responsibility or liability for any use of
the information contained herein. Nothing in this document shall
operate as an express or implied license or indemnity under the

HOPE MICROELECTRONICS CO.,LTD

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ShenNan Rd., Shenzhen,China
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t

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intellectual property rights of Hope Microelectronics or third parties.
The products described in this document are not intended for use in
implantation or other direct life support applications where malfunction
may result in the direct physical harm or injury to persons. NO
WARRANTIES OF ANY KIND, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MECHANTABILITY OR FITNESS
FOR A ARTICULAR PURPOSE, ARE OFFERED IN THIS
DOCUMENT.

©2006, HOPE MICROELECTRONICS CO.,LTD. All rights reserved.

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