Rainbow Electronics RFM12 User Manual

RFM12

RFM12

UNIVERSAL ISM BAND FSK TRANSCEIVER MODULE

RFM12

（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

RF12 data sheets）

General Introduction

RFM12 is a low costing ISM band transceiver
module implemented with unique PLL. It works
signal ranges from 315/433/868/915MHZ 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

• 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)

• AFC

• DQD

• Internal data filtering and clock recovery

• RX synchron pattern recognition

• SPI interface

• Clock and reset signal output for external MCU use

• 16 bit RX Data FIFO

• Two 8 bit TX data registers

• 10MHz crystal for PLL timing

• Wakeup timer

• 2.2V - 5.4V power supply

• Low power consumption

• Standby current less than 0.3uA

Tel: [phone] Fax: [phone] E-mail: [e-mail]

http://www.hoperf.com

RFM12

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

Tel: [phone] Fax: [phone] E-mail: [e-mail]

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）

http://www.hoperf.com

RFM12

Electrical Parameter：

Maximum（not at working mode）

symbol parameter minimum maximum Unit
V

dd

V

in

I

in

ESD Human body model 1000 V
T

st

T

ld

Recommended working range

symbol parameter minimum maximum Unit
V

dd

T

op

DC characteristic

symbol parameter Remark minimum typical maximum Unit
I

dd_TX_0

I

dd_TX_PMAX

I

dd_RX

I

x

I

pd

I

lb

V

lb

V

lba

V

il

V

ih

I

il

I

ih

V

ol

V

oh

Positive power supply -0.5 6.0 V
All pin input level -0.5 Vdd+0.5 V
Input current except power -25 25 mA

Storage temperature -55 125
Soldering temperature(10s) 260

℃
℃

Positive power supply 2.2 5.4 V
Working temperature -40 85

Supply current
(TX mode, P

out

= 0dBm)

315,433MHz band
868MHz band

13

915MHz band
Supply current
(TX mode, P

out

= P

max

315,433MHz band

)

868MHz band

21

915MHz band
Supply current
(RX mode)

315,433MHz band

868MHz band

10

915MHz band
Stand by current Crystal and base band

16
17

mA
24
25

mA
12
13
3．0 3．5

℃

mA

mA

on
Sleep mode current All blocks off 0.3 uA
Low battery detection 0.5 uA
Low battery step 0.1V per step 2.2 5.3 V
Low battery detection

75 mV
accuracy
Low level input 0.3*V
High level input 0.7*V

V

dd

V

dd

Leakage current Vil=0V -1 1 uA
Leakage current Vih=Vdd, Vdd=5.4V -1 1 uA
Low level output Iol=2mA 0.4 V
High level output Ioh=-2mA Vdd-0.4 V

Tel: [phone] Fax: [phone] E-mail: [e-mail]

http://www.hoperf.com

RFM12

AC characteristic

symbol parameter remark min typical max Unit
f

ref

f

LO

f

LO

f

LO

BW Receiver

t

lock

PLL frequency 8 10 12 MHz
frequency
(10MHz crystal
used)

315 MHz band,2.5KHz step
433 MHz band,2.5KHz step
868 MHz band,5KHz step

915 MHz band,7.5KHz step
frequency
(8MHZ crystal
used)

315 MHz band,2.5KHz step

433 MHz band,2.5KHz step

868 MHz band,5KHz step

915 MHz band,7.5KHz step
frequency
(12MHZ crystal
used)

315 MHz band,2.5KHz step

433 MHz band,2.5KHz step

868 MHz band,5KHz step

915 MHz band,7.5KHz step

1
bandwidth

2

3

4

5

6
PLL lock time After 10MHz step hopping,

310.24

430.24

860.48

900.72

248.19

344.19

688.38

720.57

372.28

516.28

1032.5

1080.8
60
120
180
240
300
360

319.75

439.75

879.51

929.27

255.80

351.80

703.61

743.41

383.71

527.71

1055.4

1115.1
67
134
200
270
350
400

75
150
225
300
375
450

20 us

MHz

MHz

MHz

KHz

frequency error <10 kHz

BR Data rate With internal digital

0.6 115.2 kbps

demodulator
BR
P

min

AFC

RS
RS
C

ARSSI

RS

A

A

R

STEP

Data rate With external RC filter 256 kbps
sensitivity BW=134KHz,BR=1.2kbps -102 -96 dBm
AFC working range df

range

FSK deviation in the

FSK

received signal

0.8*
df

FSK

RSSI accuracy ±5 dB
RSSI range 46 dB
ARSSI filter 1 nF
RSSI

6 dB

programmable step

RS

RESP

DRSSI response
time

RSSI output high after
valid , CARRSI=5nF

500 us

AC characteristic(Transmitter)

symbol parameter remark min typical max Unit
P

max

P

out

Available output power with
optimal antenna impedance

315/433MHZ band
868/915MHZ band

Typical output power Selectable in 3 dB

steps

8 0 dbm

P

-21 P

max

max

dbm

Tel: [phone] Fax: [phone] E-mail: [e-mail]

http://www.hoperf.com

RFM12

C

o

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)

Q

o

L

out

Quality factor of the output
capacitance

In low bands
In high bands

Output phase noise 100 kHz from carrier

1 MHz from carrier

13
8

-75

15
10

17
12

-85

dbc/HZ

BR FSK bit rate 256 kbps
df

fsk

FSK frequency deviation Programmable in 15

15 240 kHZ

kHz steps

AC characteristic(Turn-on/Turnaround timings)

symbol parameter remark min typical max Unit
T

st

T

tx_rx_XTAL_ON

T

rx_tx_XTAL_ON

Crystal oscillator startup
time
Transmitter - Receiver
turnover time
Receiver - Transmitter
turnover time

Crystal ESR < 100 5 ms

Synthesizer off, crystal

450 us
oscillator on
Synthesizer off, crystal

350 us
oscillator on

T

tx_rx_SYNT_ON

T

rx_tx_SYNT_ON

C

xl

t

POR

Transmitter - Receiver
turnover time
Receiver - Transmitter
turnover time
Crystal load
capacitance

Synthesizer on, crystal
oscillator on
Synthesizer on, crystal
oscillator on
Programmable in 0.5 pF steps,
tolerance+/- 10%

Internal POR timeout After Vdd has reached 90% of

425 us

300 us

8.5 16 pf

100 ms
final value

t

PBt

Wake-up timer clock

Calibrated every 30 seconds 0.96 1.05 ms

period

C

in, D

t

r, f

Digital input apacitance 2 pf
Digital output rise/fall

15pF pure capacitive load 10 ns

time

Field testing range

Band Test condition Distance
315MHz band Receiver bandwidth=67KHz,data rate =1.2kbps,Transmitter frequency

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

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

>100M

>150M

>100M

>100M

Tel: [phone] Fax: [phone] E-mail: [e-mail]

http://www.hoperf.com

SGS Reports

RFM12

Tel: [phone] Fax: [phone] E-mail: [e-mail]

http://www.hoperf.com

RFM12

Tel: [phone] Fax: [phone] E-mail: [e-mail]

http://www.hoperf.com

RFM12

Mechanical Dimension

（units in mm）

SMD PACKAGE（S1）

SMD PACKAGE（S2）

Tel: [phone] Fax: [phone] E-mail: [e-mail]

http://www.hoperf.com

RFM12

DIP PACKAGE（D）

Module Model Definition

model=module-operation band

RFM12 – 433-D/S

module type operation band Package

example：1，RFM12 module at 433MHz band, DIP : RFM12-433-D。
2，RFM12 module at 868MHZ band, SMD, thickness at 4.2mm: RFM12-868-S1。

Tel: [phone] Fax: [phone] E-mail: [e-mail]

http://www.hoperf.com

RFM12

HOPE MICROELECTRONICS CO.,LTD

Rm B.8/F LiJingGe Emperor Regency 6012
ShenNan Rd., Shenzhen,China
Tel: [phone]
Fax: [phone]
Email:

[e-mail]

Website:

http://hoperf.en.alibaba.com

[e-mail]

http://www.hoperf.com

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
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.

Tel: [phone] Fax: [phone] E-mail: [e-mail]

http://www.hoperf.com