RFM119SW [HOPERF]
Embedded EEPROM;
| 型号： | RFM119SW |
| 厂家： | 
HOPERF |
| 描述： | Embedded EEPROM 可编程只读存储器 电动程控只读存储器 电可擦编程只读存储器 |
| 文件： | 总19页 (文件大小：763K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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RFM119W/RFM119SW
Featurs
Embedded EEPROM
y Very Easy Development with RFPDK
y All Features Programmable
Frequency Range: 240 to 960 MHz
FSK, GFSK and OOK Modulation
Symbol Rate:
0.5 to 100 ksps (FSK/GFSK)
0.5 to 30 ksps (OOK)
Deviation: 1.0 to 200 kHz
Two-wire Interface for Registers Accessing and
EEPROM Programming
Output Power: -10 to +13 dBm
Supply Voltage: 1.8 to 3.6 V
Sleep Current: < 20 nA
FCC/ETSI Compliant
RFM119W
RoHS Compliant
Module Size:17.8*12.8*5.0mm (RFM119W)
16*16*5.0mm (RFM119SW)
Descriptios
The RFM119W/RFM119SW is a high performance,
highly
flexible, low-cost, single-chip (G)FSK/OOK
transmitter for various,240 to 960 MHz wireless
applications. It is a part of the HOPERF NextGenRFTM
family, which includes a complete line of transmitters,
receivers and transceivers. The RFM119W/RFM119SW
provides the simplest way to control the data
transmission. The transmission is started when an
effective level turnover is detected on the DATA pin,
while the transmission action will stop after the DATA pin
holding level low for a defined time window, or after a
two-wire interface (TWI) command is issued. The chip
features can be configured in two different ways: setting
the configuration registers through the TWI, or
programming the embedded
RFM119SW
Applications
RFPDK. The device operates from a supply voltage of 1.8
V to 3.6 V, consumes 27.6 mA (FSK @ 868.35 MHz)
when transmitting +10 dBm output power, and only leak
Low-Cost Consumer Electronics Applications
Home and Building Automation
Remote Fan Controllers
20 nA when
it
is
in
sleep
state.
The
Infrared Transmitter Replacements
Industrial Monitoring and Controls
Remote Lighting Control
RFM119W/RFM119SW transmitter together with the
CMT2219A receiver enables a robust RF link.
Wireless Alarm and Security Systems
Remote Keyless Entry (RKE)
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RFM119W/RFM119SW
Abbreviations
Abbreviations used in this data sheet are described below
AN
Application Notes
PA
Power Amplifier
BOM
BSC
Bill of Materials
PC
Personal Computer
Printed Circuit Board
Phase Noise
Basic Spacing between Centers
PCB
EEPROM
Electrically Erasable Programmable Read-Only PN
Memory
RCLK
Reference Clock
ESD
ESR
ETSI
Electro-Static Discharge
Equivalent Series Resistance
European Telecommunications Standards
Institute
RF
Radio Frequency
RF Product Development Kit
Restriction of Hazardous Substances
Receiving, Receiver
Small-Outline Transistor
Symbol Rate
RFPDK
RoHS
Rx
FCC
FSK
GFSK
Max
Federal Communications Commission
Frequency Shift Keying
Gauss Frequency Shift Keying
Maximum
SOT
SR
TWI
Two-wire Interface
Transmission, Transmitter
Typical
Tx
MCU
Min
Microcontroller Unit
Typ
Minimum
USB
XO/XOSC
XTAL
PA
Universal Serial Bus
Crystal Oscillator
Crystal
MOQ
NP0
Minimum Order Quantity
Negative-Positive-Zero
Occupied Bandwidth
On-Off Keying
OBW
OOK
Power Amplifier
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RFM119W/RFM119SW
Table of Contents
1. Electrical Characteristics............................................................................................................................................ 4
1.1 Recommended Operating Conditions ................................................................................................................... 4
1.2 Absolute Maximum Ratings................................................................................................................................... 4
1.3 Transmitter Specifications..................................................................................................................................... 5
2. Pin Descriptions .......................................................................................................................................................... 6
3. Typical Performance Characteristics......................................................................................................................... 7
4. Typical Application Schematics ................................................................................................................................. 8
5. Functional Descriptions.............................................................................................................................................. 9
5.1 Overview............................................................................................................................................................. 9
5.2 Modulation, Frequency, Deviation and Symbol Rate .......................................................................................... 9
5.3 Embedded EEPROM and RFPDK ...................................................................................................................... 10
5.4 Power Amplifier................................................................................................................................................... 11
5.5 PA Ramping........................................................................................................................................................ 12
5.6. Working States and Transmission Control Interface ....................................................................................... 13
5.6.1 Working States................................................................................................................................................. 14
5.6.2 Transmission Control Interface ........................................................................................................................ 14
5.6.2.1 Tx Enabled by DATA Pin Rising Edge................................................................................................... 14
5.6.2.2 Tx Enabled by DATA Pin Falling Edge...................................................................................................14
5 6.2.3 Two-wire Interface ................................................................................................................................14
6. Ordering Information................................................................................................................................................. 17
7. Package Outline......................................................................................................................................................... 18
8. Contact Information .................................................................................................................................................... 19
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RFM119W/RFM119SW
1. Electrical Characteristics
VDD = 3.3 V, TOP = 25 ℃, FRF = 868.35 MHz, FSK modulation, output power is +10 dBm terminated in a matched 50 Ω
impedance, unless otherwise noted.
1.1 Recommended Operating Conditions
Table 2. Recommended Operation Conditions
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Operation Voltage Supply
Operation Temperature
VDD
TOP
1.8
-40
3.6
85
V
℃
Supply Voltage Slew Rate
1
mV/us
1.2 Absolute Maximum Ratings
Table 3. Absolute Maximum Ratings[1]
Conditions
Min
Parameter
Supply Voltage
Symbol
VDD
Max
3.6
Unit
V
-0.3
-0.3
-40
-50
Interface Voltage
VIN
VDD + 0.3
125
V
Junction Temperature
Storage Temperature
Soldering Temperature
ESD Rating
TJ
℃
℃
℃
kV
mA
TSTG
TSDR
150
Lasts at least 30 seconds
Human Body Model (HBM)
@ 85 ℃
255
-2
2
Latch-up Current
-100
100
Note:
[1]. Stresses above those listed as “absolute maximum ratings” may cause permanent damage to the device. This is a stress
rating only and functional operation of the device under these conditions is not implied. Exposure to maximum rating
conditions for extended periods may affect device reliability.
Caution! ESD sensitive device. Precaution should be used when handling the device in order
to prevent permanent damage.
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1.3 Transmitter Specifications
Table 4. Transmitter Specifications
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Frequency Range[1]
FRF
240
960
MHz
Hz
FRF ≤ 480 MHz
FRF > 480 MHz
FSK/GFSK
OOK
198
397
Synthesizer Frequency
Resolution
FRES
SR
Hz
0.5
0.5
100
30
ksps
ksps
Symbol Rate
(G)FSK Modulation
FDEV
1
-
200
-
kHz
Deviation Range
Bandwidth-Time Product
Maximum Output Power
Minimum Output Power
Output Power Step Size
OOK PA Ramping Time[2]
BT
GFSK modulation
0.5
+13
-10
1
-
dBm
dBm
dB
POUT(Max)
POUT(Min)
PSTEP
tRAMP
0
1024
us
OOK, 0 dBm, 50% duty cycle
OOK, +10 dBm, 50% duty cycle
OOK, +13 dBm, 50% duty cycle
FSK, 0 dBm, 9.6 ksps
6.7
13.4
17.4
10.5
23.5
32.5
8.0
mA
mA
mA
Current Consumption
@ 433.92 MHz
IDD-433.92
mA
mA
FSK, +10 dBm, 9.6 ksps
FSK, +13 dBm, 9.6 ksps
mA
OOK, 0 dBm, 50% duty cycle
OOK, +10 dBm, 50% duty cycle
OOK, +13 dBm, 50% duty cycle
FSK, 0 dBm, 9.6 ksps
mA
mA
15.5
19.9
12.3
27.6
36.1
20
mA
Current Consumption
@ 868.35 MHz
IDD-868.35
mA
mA
FSK, +10 dBm, 9.6 ksps
FSK, +13 dBm, 9.6 ksps
mA
Sleep Current
ISLEEP
nA
Frequency Tune Time
tTUNE
370
-80
us
100 kHz offset from FRF
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
dBm
dBm
dBm
dBm
dB
Phase Noise @ 433.92
MHz
PN433.92
600 kHz offset from FRF
-98
1.2 MHz offset from FRF
-107
-74
100 kHz offset from FRF
Phase Noise @ 868.35
MHz
PN868.35
600 kHz offset from FRF
-92
1.2 MHz offset from FRF
-101
-52
H2433.92
H3433.92
H2868.35
H3868.35
2nd harm @ 867.84 MHz, +13 dBm POUT
3rd harm @ 1301.76 MHz, +13 dBm POUT
2nd harm @ 1736.7 MHz, +13 dBm POUT
3rd harm @ 2605.05 MHz, +13 dBm POUT
Harmonics Output for
433.92 MHz[3]
-60
-67
Harmonics Output for
868.35 MHz [3]
-55
OOK Extinction Ration
60
Notes:
[1]. The frequency range is continuous over the specified range.
[2]. 0 and 2n us, n = 0 to 10, when set to “0”, the PA output power will ramp to its configured value in the shortest possible
time.
[3]. The harmonics output is measured with the application shown as Figure 10.
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RFM119W/RFM119SW
2. Pin Descriptions
RFM119W. Pin Diagram
RFM119SW. Pin Diagram
Table 6. RFM119W/RFM119SW Pin Descriptions
Pin Number
Name
I/O
Descriptions
RFM119W RFM119SW
1
2
1
4
ANT
VDD
O
I
Transmitter RF Output
Power Supply 1.8V to 3.6V
Data input to be transmitted or
Data pin to access the embedded EEPROM
3
8
DATA
I/O
4
5
6
7
2,7,9,14
3,5,6,
11
GND
NC
I
---
I
Ground
Connect to GND
CLK
GND
Clock pin to access the embedded EEPROM
Ground
I
8
10,12,13
NC
---
Connect to GND
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3. Typical Performance Characteristics
Phase Noise @ 868.35 MHz
Phase Noise @ 433.92 MHz
15
5
13.0 dBm
@ 868.35 MHz
20
10
13.4 dBm
@ 433.92 MHz
‐5
0
‐10
‐20
‐30
‐40
‐50
‐60
‐70
‐15
‐25
‐35
‐45
‐55
‐65
-55.9 dBm
@ 869.55 MHz
‐56.7 dBm
@ 435.12 MHz
432.42 432.67 432.92 433.17 433.42 433.67 433.92 434.17 434.42 434.67 434.92 435.17 435.42
866.85 867.1 867.35 867.6 867.85 868.1 868.35 868.6 868.85 869.1 869.35 869.6 869.85
Frequency (MHz) (RBW=10 kHz)
Frequency (MHz) (RBW = 10 kHz)
Figure 3. Phase Noise, FRF = 433.92 MHz,
POUT = +13 dBm, Unmodulated
Figure 4. Phase Noise, FRF = 868.35 MHz,
POUT = +13 dBm, Unmodulated
OOK Spectrum, SR = 9.6 ksps
FSK vs. GFSK
20
10
10
0
‐10
‐20
‐30
‐40
‐50
0
FSK
-10
GFSK
-20
-30
-40
-50
433.18
433.37
433.55
433.74
433.92
434.11
434.29
434.48
434.66
433.62
433.72
433.82
433.92
434.02
434.12
434.22
Frequency (MHz)
Frequency (MHz)
Figure 5. OOK Spectrum, SR = 9.6 ksps,
POUT = +10 dBm, tRAMP = 32 us
Figure 6. FSK/GFSK Spectrum,
SR = 9.6 ksps, FDEV = 15 kHz
Spectrum of Various PA Ramping
Options
POUT vs.
VDD
10
0
14
12
10
8
1024 us
512 us
256 us
128 us
64 us
32 us
SR = 1.2 ksps
‐10
0
dBm
+10 dB
+13 dB
m
m
4
2
‐30
‐40
‐50
0
‐2
1.6
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
3.8
433.17
433.37
433.57
433.77
433.97
434.17
434.37
434.57
Supply Voltage VDD (V)
Frequency (MHz)
Figure 7. Spectrum of PA Ramping,
SR = 1.2 ksps, POUT = +10 dBm
Figure 8. Output Power vs. Supply
Voltages, FRF = 433.92 MHz
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4. Typical Application Schematics
RFM119W
RFM119SW
Figure 9: Typical Application Schematic
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5. Functional Descriptions
VDD
GND
VCO
XOSC
XTAL
PFD/CP
Loop Filter
RFO
PA
Fractional-N
DIV
Ramp
Control
Modulator
EEPROM
CLK
Interface and Digital Logic
DATA
Figure 11. RFM119W/RFM119SW Functional Block Diagram
5.1 Overview
The RFM119W/RFM119SW is a high performance, highly flexible, low-cost, single-chip (G)FSK/OOK transmitter for various 240
to 960
MHz wireless applications. It is part of the HOPERF NextGenRFTM family, which includes a complete line of transmitters,
receivers and transceivers. The chip is optimized for the low system cost, low power consumption, battery powered application
with its highly integrated and low power design.
The functional block diagram of the RFM119W/RFM119SW is shown in the figure above. The RFM119W/RFM119SW is
based on direct synthesis of the RF frequency, and the frequency is generated by a low-noise fractional-N frequency
synthesizer. It uses a 1-pin crystal oscillator circuit with the required crystal load capacitance integrated on-chip to minimize
the number of external components. Every analog block is calibrated on each Power-on Reset (POR) to the internal voltage
reference. The calibration can help the chip to finely work under different temperatures and supply voltages. The
RFM119W/RFM119SW uses the DATA pin for the host MCU to send in the data. The input data will be modulated and sent
out by a highly efficient PA, which output power can be configured from -10 to +13 dBm in 1 dB step size
The user can directly use the RFM119W/RFM119SW default configuration for immediate demands. If that cannot meet the
system requirement, on-line register configuration and off-line EEPROM programming configuration are available for the user
to customize the chip features. The on-line configuration means there is an MCU available in the application to configure the
chip registers through the 2-wire interface, while the off-line configuration is done by the HOPERF USB Programmer and the
RFPDK. After the configuration is done, only the DATA pin is required for the host MCU to send in the data and control the
transmission. The RFM119W/RFM119SW operates from 1.8 to 3.6 V so that it can finely work with most batteries to their
useful power limits. It only consumes 15.5 mA (OOK @ 868.35 MHz) / 27.6 mA (FSK @ 868.35 MHz) when transmitting +10
dBm power under 3.3 V supply voltage.
5.2 Modulation, Frequency, Deviation and Symbol Rate
The RFM119W/RFM119SW supports GFSK/FSK modulation with the symbol rate up to 100 ksps, as well as OOK modulation
with the symbol rate up to 30 ksps. The supported deviation of the (G)FSK modulation ranges from 1 to 200 kHz. The
RFM119W/RFM119SW continuously covers the frequency range from 240 to 960 MHz, including the license free ISM
frequency band around 315 MHz,
433.92 MHz, 868.35 MHz and 915 MHz. The device contains a high spectrum purity low power fractional-N frequency
synthesizer with output frequency resolution better than 198 Hz when the frequency is less than 480 MHz, and is about 397 Hz
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when the frequency is larger than 480 MHz. See the table below for the modulation, frequency and symbol rate specifications.
Table 9. Modulation, Frequency and Symbol Rate
Parameter
Value
(G)FSK/OOK
240 to 960
1 to 200
198
Unit
-
Modulation
Frequency
Deviation
MHz
kHz
Hz
Frequency Resolution (FRF ≤ 480 MHz)
Frequency Resolution (FRF > 480 MHz)
Symbol Rate (FSK/GFSK)
397
Hz
0.5 to 100
0.5 to 30
ksps
ksps
Symbol Rate (OOK)
5.3 Embedded EEPROM and RFPDK
The RFPDK (RF Products Development Kit) is a very user-friendly software tool delivered for the user configuring the
RFM119W/RFM119SW in the most intuitional way. The user only needs to fill in/select the proper value of each parameter
and click the “Burn” button to complete the chip configuration. See the figure below for the accessing of the EEPROM and
Table 10 for the
summary of all the configurable parameters of the RFM119W/RFM119SW in the RFPDK.
RFM119W/S
RFPDK
EEPROM
CLK
HOPERF USB
Programmer
Interface
DATA
Figure 12. Accessing Embedded EEPROM
For more details of the HOPERF USB Programmer and the RFPDK, please refer to “AN103 CMT211xA-221xA One-Way RF
Link Development Kits Users Guide”. For the detail of RFM119W/RFM119SW configurations with the RFPDK, please refer to
“AN122
CMT2113/19A Configuration Guideline”.
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Table 10. Configurable Parameters in RFPDK
Category
Parameters
Descriptions
Default
Mode
To input a desired transmitting radio frequency in
the range from 240 to 960 MHz. The step size is
0.001 MHz.
Basic
Frequency
868.35 MHz
Advanced
Basic
Advanced
Basic
Modulation
Deviation
The option is FSK or GFSK and OOK.
FSK
The FSK frequency deviation. The range is from
1 to 100 kHz.
35 kHz
Advanced
The GFSK symbol rate. The user does not need
to specify symbol rate for FSK and OOK
modulation.
Basic
Symbol Rate
2.4 ksps
Advanced
To select a proper transmitting output power from
-10 dBm to +14 dBm, 1 dB margin is given above
+13 dBm.
Basic
RF Settings
Tx Power
Xtal Load
Data
+13 dBm
15 pF
Advanced
On-chip XOSC load capacitance options: from 10
to 22 pF. The step size is 0.33 pF.
To select whether the frequency “Fo + Fdev”
represent data 0 or 1. The options are:
Basic Advanced
Advanced
0: F-low
Representation 0: F-high 1: F-low, or
0: F-low 1: F-high.
1: F-high
To control PA output power ramp up/down time
PA Ramping
for OOK transmission, options are 0 and 2n us (n
0 us
Advanced
from 0 to 10).
Start condition of a transmitting cycle, by Data
Pin Rising/Falling Edge.
Data Pin Rising
Edge
Start by
Stop by
Advanced
Advanced
Transmitting
Settings
Data Pin
Stop condition of a transmitting cycle, by Data
Pin Holding Low for 2 to 90 ms.
Holding Low for
20 ms
5.4 Power Amplifier
A highly efficient single-ended Power Amplifier (PA) is integrated in the RFM119W/RFM119SW to transmit the modulated
signal out. Depending on the application, the user can design a matching network for the PA to exhibit optimum efficiency at
the desired output power for a wide range of antennas, such as loop or monopole antenna. Typical application schematics
and the required BOM are shown in “Chapter 4 Typical Application Schematic”. For the schematic, layout guideline and the
other detailed information please refer to “AN101 CMT211xA Schematic and PCB Layout Design Guideline”.
The output power of the PA can be configured by the user within the range from -10 dBm to +13 dBm in 1 dB step size using
the HOPERF USB Programmer and RFPDK.
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5.5 PA Ramping
When the PA is switched on or off quickly, its changing input impedance momentarily disturbs the VCO output frequency. This
process is called VCO pulling, and it manifests as spectral splatter or spurs in the output spectrum around the desired carrier
frequency. By gradually ramping the PA on and off, PA transient spurs are minimized. The RFM119W/S has built-in PA
ramping configurability with options of 0, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 and 1024 us, as shown in Figure 13. These
options are only available when the modulation type is OOK. When the option is set to “0”, the PA output power will ramp up
to its configured value in the shortest possible time. The ramp down time is identical to the ramp up time in the same
configuration.
HOPERF recommends that the maximum symbol rate should be no higher than 1/2 of the PA ramping “rate”, as shown in the
formula below.
1
)
SRMax ≤ 0.5 *
(
tRAMP
In which the PA ramping “rate” is given by (1/tRAMP). In other words, by knowing the maximum symbol rate in the application,
the PA ramping time can be calculated by formula below.
1
tRAMP ≤ 0.5 *
(
)
SRMAX
The user can select one of the values of the tRAMP in the available options that meet the above requirement. If somehow the
RAMP is set to be longer than “0.5 * (1/SRMax)”, it will possibly bring additional challenges to the OOK demodulation of the Rx
device. For more detail of calculating tRAMP, please refer to “AN122 CMT2113/19A Configuration Guideline”.
t
0
1
2
4
8
us
us
us
us
us
512 us
1024 us
Time
Time
Logic 1
Logic 0
Figure 13. PA Ramping Time
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5.6. Working States and Transmission Control Interface
The RFM119W/S has following 4 different working states: SLEEP, XO-STARTUP, TUNE and TRANSMIT.
SLEEP
When the RFM119W/RFM119SW is in the SLEEP state, all the internal blocks are turned off and the current consumption is
minimized to
20 nA typically.
XO-STARTUP
After detecting a valid control signal on DATA pin, the RFM119W/RFM119SW goes into the XO-STARTUP state, and the
internal XO starts to work. The valid control signal can be a rising or falling edge on the DATA pin, which can be configured on
host MCU has to wait for the tXTAL to allow the XO to get stable. The tXTAL is to a large degree crystal
the RFPDK. The
dependent. A typical value of tXTAL is provided in the Table 11.
TUNE
The frequency synthesizer will tune the RFM119W/RFM119SW to the desired frequency in the time tTUNE. The PA can be
turned on to
See Figure
transmit the incoming data only after the TUNE state is done, before that the incoming data will not be transmitted.
16 and Figure 17 for the details.
TRANSMIT
The RFM119W/RFM119SW starts to modulate and transmit the data coming from the DATA pin. The transmission can be
methods: firstly, driving the DATA pin low for tSTOP time, where the tSTOP can be configured from 20 to 90 ms on the
ended in 2
RFPDK;
secondly, issuing SOFT_RST command over the two-wire interface, this will stop the transmission in 1 ms. See
Section 6.2.3 for details of the two-wire interface.
Table 11.Timing in Different Working States
Parameter
Symbol
tXTAL
Min
Typ
400
370
Max
Unit
us
XTAL Startup Time [1]
Time to Tune to Desired Frequency
Hold Time After Rising Edge
tTUNE
us
tHOLD
10
2
ns
Time to Stop the Transmission[2]
tSTOP
90
ms
Notes:
[1]. This parameter is to a large degree crystal dependent.
[2]. Configurable from 2 to 9 in 1 ms step size and 20 to 90 ms in 10 ms step size.
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5.6.1 Tx Enabled by DATA Pin Rising Edge
As shown in the figure below, once the RFM119W/RFM119SW detects a rising edge on the DATA pin, it goes into the XO-
The user has to pull the DATA pin high for at least 10 ns (tHOLD) after detecting the rising edge, as well as wait
STARTUP state.
for the sum of tXTAL and tTUNE before sending any useful information (data to be transmitted) into the chip on the DATA pin. The
logic state of the DATA pin is “Don't Care” from the end of tHOLD till the end of tTUNE. In the TRANSMIT state, PA sends out the
input data after
they are modulated. The user has to pull the DATA pin low for tSTOP in order to end the transmission.
SLEEP
SLEEP
XO-STARTUP TUNE
TRANSMIT
STATE
t
TUNE
t
XTAL
t
STOP
0
Rising Edge
0
Don’t Care
Valid Transmitted Data
RF Signals
DATA pin
PA out
1
t
HOLD
Figure 16. Transmission Enabled by DATA Pin Rising Edge
5.6.2 Tx Enabled by DATA Pin Falling Edge
As shown in the figure below, once the RFM119W/RFM119SW detects a falling edge on the DATA pin, it goes into XO-
STARTUP state and the XO starts to work. During the XO-STARTUP state, the DATA pin needs to be pulled low. After the XO
is settled, the RFM119W/RFM119SW goes to the TUNE state. The logic state of the DATA pin is “Don't Care” during the TUNE
state, PA sends out the input data after they are modulated. The user has to pull the DATA pin low for
state. In the TRANSMIT
STOP in order to end the
transmission. Before starting the next transmit cycle, the user has to pull the DATA pin back to high.
t
TRANSMIT
SLEEP
SLEEP XO-STARTUP TUNE
STATE
t
TUNE
t
STOP
0
t
XTAL
0
Falling Edge
Don’t Care
1
Valid Transmitted Data
RF Signals
1
DATA pin
PA out
Figure 17. Transmission Enabled by DATA Pin Falling Edge
5.6.3 Two-wire Interface
For power-saving and reliable transmission purposes, the RFM119W/RFM119SW is recommended to communicate with
the host MCU over a two-wire interface (TWI): DATA and CLK. The TWI is designed to operate at a maximum of 1 MHz.
The timing requirement and data transmission control through the TWI are shown in this section.
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Table 12. TWI Requirements
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Digital Input Level High
Digital Input Level Low
CLK Frequency
VIH
VIL
0.8
VDD
VDD
kHz
ns
0.2
FCLK
tCH
10
1,000
CLK High Time
500
500
CLK Low Time
tCL
ns
CLK delay time for the first falling edge of the
TWI_RST command, see Figure 20
The data delay time from the last CLK rising
edge of the TWI command to the time DATA
return to default state
CLK Delay Time
tCD
20
15,000
15,000
ns
DATA Delay Time
tDD
ns
DATA Setup Time
DATA Hold Time
tDS
tDH
From DATA change to CLK falling edge
From CLK falling edge to DATA change
20
ns
ns
200
CLK
tCH
tCL
t
DS DH
t
DATA
Figure 18. Two-wire Interface Timing Diagram
Once the device is powered up, TWI_RST and SOFT_RST should be issued to make sure the device works in SLEEP state
robustly. On every transmission, TWI_RST and TWI_OFF should be issued before the transmission to make sure the TWI
circuit functions correctly. TWI_RST and SOFT_RST should be issued again after the transmission for the device going back to
SLEEP state reliably till the next transmission. The operation flow with TWI is shown as the figure below.
Reset TWI
One Transmission Cycle
One Transmission Cycle
(1) ‐ TWI_RST
(2) ‐ SOFT_RST
(1) ‐ TWI_RST
(2) ‐ TWI_OFF
(1) ‐ TWI_RST
(2) ‐ SOFT_RST
(1) ‐ TWI_RST
(2) ‐ TWI_OFF
(1) ‐ TWI_RST
(2) ‐ SOFT_RST
TRANSMISSION
TRANSMISSION
Figure 19. RFM119W/S Operation Flow with
TWI
Table 13. TWI Commands Descriptions
Descriptions
Command
Implemented by pulling the DATA pin low for 32 clock cycles and clocking in 0x8D00, 48 clock cycles in total.
It only resets the TWI circuit to make sure it functions correctly. The DATA pin cannot detect the
Rising/Falling edge to trigger transmission after this command, until the TWI_OFF command is issued.
TWI_RST
Notes:
1.
2.
Please ensure the DATA pin is firmly pulled low during the first 32 clock cycles.
When the device is configured as Transmission Enabled by DATA Pin Falling Edge, in order to issue
the TWI_RST command correctly, the first falling edge of the CLK should be sent tCD after the DATA
falling edge, which should be longer than the minimum DATA setup time 20 ns, and shorter than 15 us,
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Command
Descriptions
as shown in Figure 20.
3.
When the device is configured as Transmission Enabled by DATA Pin Rising Edge, the default state of
the DATA is low, there is no tCD requirement, as shown in Figure 21.
Implemented by clocking in 0x8D02, 16 clock cycles in total.
TWI_OFF
It turns off the TWI circuit, and the DATA pin is able to detect the Rising/Falling edge to trigger transmission
after this command, till the TWI_RST command is issued. The command is shown as Figure 22.
Implemented by clocking in 0xBD01, 16 clock cycles in total.
It resets all the other circuits of the chip except the TWI circuit. This command will trigger internal calibration
for getting the optimal device performance. After issuing the SOFT_RST command, the host MCU should
wait 1 ms before sending in any new command. After that, the device goes to SLEEP state. The command is
shown as Figure 23.
SOFT_RST
32 clock cycles
16 clock cycles
CLK
…
…
t
CD
t
DD
DATA
1
0
0x8D00
1
Figure 20. TWI_RST Command When Transmission Enabled by DATA Pin Falling Edge
32 clock cycles
16 clock cycles
CLK
…
…
0
0x8D00
0
DATA
Figure 21. TWI_RST Command When Transmission Enabled by DATA Pin Rising Edge
16 clock cycles
16 clock cycles
CLK
…
CLK
…
tDD
t
DD
Default
State
Default
State
DATA
0xBD01 (SOFT_RST)
DATA
0x8D02 (TWI_OFF)
Figure 22. TWI_OFF Command
Figure 23. SOFT_RST Command
The DATA is generated by the host MCU on the rising edge of CLK, and is sampled by the device on the falling edge. The CLK
should be pulled up by the host MCU during the TRANSMISSION shown in Figure 19. The TRANSMISSION process should
refer to Figure 16 or Figure 17 for its timing requirement, depending on the “Start By” setting configured on the RFPDK.
The device will go to SLEEP state by driving the DATA low for tSTOP, or issuing SOFT_RST command. A helpful practice for the
device to go to SLEEP is to issue TWI_RST and SOFT_RST commands right after the useful data is transmitted, instead of
waiting the tSTOP, this can save power significantly.
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6. Ordering Information
RFM119W-433 S1
Package
Operation Band
Mode Type
P/N: RFM119W-315S1
RFM119W module at 315MHz band,SMD Package
P/N: RFM119SW-433S1
RFM119SW module at 433.92MHz band ,SMD Package
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7. Package Outline
Figure 18
S1 Package Outline Drawing
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8.Contact Information
HOPE MICROELECTRONICS CO.,LTD
Add: 2/F, Building 3, Pingshan Private Enterprise Science and Technology Park, Lishan Road, XiLi Town, Nanshan
District, Shenzhen, Guangdong, China
Tel: 86-755-82973805
Fax: 86-755-82973550
Email: sales@hoperf.com
Website: http://www.hoperf.com
http://www.hoperf.cn
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
HOPE MICROELECTRONICS CO.,LTD
Add: 2/F, Building 3, Pingshan Private
Enterprise Science and Technology
Park, Lishan Road, XiLi Town, Nanshan
District, Shenzhen, Guangdong, China
Tel: 86-755-82973805
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.
Fax: 86-755-82973550
Email: sales@hoperf.com
Website: http://www.hoperf.com
http://www.hoperf.cn
©2006, HOPE MICROELECTRONICS CO.,LTD. All rights reserved.
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