RFM68CW-915S2

RFM68CW HOPE | Alldatasheet

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Features

ultra-low-cost, FSK or OOK transmitter module suitable for operation in the 315, 433, 868 and 915 MHz licence free ISM bands., the RFM68CW may be used without the requirement for configuration via an MCU. However, in conjunction with a microcontroller, the communication link parameters may be re-configured. Including, output power, modulation format and operating channel. The RFM68CW offers integrated radio performance with cost efficiency and is suited for operation in North America FCC part 15.231, FCC part 15.247 DTS and FHSS modes,15.249, and Europe EN 300 220. In order to better use RFM68CW modules, this specification also involves a large number of the parameters and functions of its core chip RF68's,including those IC pins which are not leaded out. All of these can help customers gain a better understanding of the performance of RFM68CW modules, and enhance the application skills.

APPLICATIONS

‹ Garage Door Openers ‹ Low-Cost Consumer Electronic Applications ‹ Remote Keyless Entry (RKE) ‹ Remote Control / Security Systems KEY PRODUCT FEATURES ‹ +10 dBm or 0 dBm Configurable output power ‹ Bit rates up to 100 kbps ‹ OOK and FSK modulation. ‹ 1.8 to 3.7 V supply range. ‹ Low BOM Fully Integrated Tx ‹ Fractional-N PLL with 1.5 kHz typical step ‹ Frequency agility for FHSS modulation ‹ FCC Part 15.247 DTS Mode compliant ‹ Module Size:16X16mm RFM68CW

T el: +86-755-82973805 F ax: +86-755-82973550 E -mail: sales@hoperf.com http:// www.hoperf.com Table of contents Section Page

T el: +86-755-82973805 F ax: +86-755-82973550 E -mail: sales@hoperf.com http:// www.hoperf.com This product datasheet contains a detailed description of the RFM68CW performance and functionality. 1. Circuit Description 1.1. General Description The RFM68CW is a multi-band transmitter module capable of FSK and OOK modulation of an input data stream. It contains a frequency synthesizer which is a fractional-N sigma-delta PLL. For frequency modulation (FSK), the modulation is made inside the PLL bandwidth. For amplitude modulation (OOK), the modulation is performed by turning on and off the output PA. The Power Amplifier (PA), connected to the RFOUT pin, can deliver 0 dBm or +10 dBm in a 50 Ω load. Each of these two output powers need a specific matching network when efficiency needs to be optimized. The circuit can be configured via a simplified TWI interface, constituted of pin CTRL and DATA. The pins of this interface are also used to transmit the modulating data to the module. Another key feature of the RFM68CW is its low current consumption in Transmit and Sleep modes and its wide voltage operating range from 1.8 V to 3.7 V. This makes the RFM68CW suitable for low-cost battery chemistries or energy harvesting applications. 1.2. Block Diagram The figure below shows the simplified block diagram of the RFM68CW

T el: +86-755-82973805 F ax: +86-755-82973550 E -mail: sales@hoperf.com http:// www.hoperf.com 1.3. Pin Description Table 1 Description of the RFM68CW Pin Diagram (TOP) Pin Description Number Name Type

Description

S1 ANT O Transmitter RF Output

2 GND I Exposed Pad, Ground

3 GND I Exposed Pad, Ground

4 VCC I Power Supply 1.8V to 3.7V

5 GND I Exposed Pad, Ground

6 DATA I/O Transmit or Configuration Data

7 TX_READY O Transmitter Ready Flag (Optional, can be left floating)

8 NC - Connect to GND

9 CTRL I Config Selection Configuration Data Clock

10 NRESET I Reset (Optional, can be left floating)

11 NC - Connect to GND

12 GND I Exposed Pad, Ground

13 GND I Exposed Pad, Ground

14 GND I Exposed Pad, Ground

T el: +86-755-82973805 F ax: +86-755-82973550 E -mail: sales@hoperf.com http:// www.hoperf.com 2. Electrical Characteristics 2.1. ESD Notice The RFM68CW is an electrostatic discharge sensitive device. It satisfies Class 2 of the JEDEC standard JESD22-A114-B (human body model) on all pins. 2.2. Absolute Maximum Ratings Stresses above the values listed below may cause permanent device failure. Exposure to absolute maximum ratings for extended periods may affect device reliability. Table 2 Absolute Maximum Ratings Symbol Description Min Max Unit VDDmr Supply Voltage -0.5 3.9 V Tmr Temperature -55 115 ° C Tjunc Junction Temperature -55 125 ° C Tstor Storage Temperature -55 150 ° C 2.3. Operating Range Operating ranges define the limits for functional operation and the parametric characteristics of the device as described in this section. Functionality outside these limits is not implied. Table 3 Operating Range Symbol VDDop Supply voltage 1.8 3.7 V Top Operational temperature range -40 85 ° C Clop Load capacitance on digital ports - 25 pF

T el: +86-755-82973805 F ax: +86-755-82973550 E -mail: sales@hoperf.com http:// www.hoperf.com 2.4. Electrical Specifications The table below gives the electrical specifications of the transmitter under the following conditions: Supply voltage = 3.3 V, temperature = 25 °C, fXOSC = 26 MHz, fRF = 915 MHz, 2-FSK modulation with Fdev=+/-10 kHz, bit rate = 10 kbit/s and output power = +10 dBm terminated in a matched 50 Ohm impedance, unless otherwise specified. Table 4 Transmitter Specifications Symbol IDDSL Supply current in Sleep mode - 0.5 1 µA IDDT_315 Supply current in Transmit mode at 315 MHz* RFOP=+10dBm 50% OOK RFOP=+10dBm FSK RFOP=0dBm FSK mA mA mA IDDT_915 Supply current in Transmit mode at 915 MHz* RFOP=+10dBm FSK RFOP=0dBm FSK 17.5 10.5 mA mA RF and Baseband Specifications Band0,For 315MHz Module 312 380 MHz Band0,For 433MHz Module 380 450 MHz Band0,For 868MHz Module 860 870 MHz FBAND Operation Frequency Bands Band1,For 915MHz Module 902 928 MHz FDA Frequency deviation, FSK 10 - 200 kHz BRF Bit rate, FSK Permissible Range 0.5 - 100 kbps BRO Bit rate, OOK Permissible Range 0.5 - 10 kbps OOK_B OOK Modulation Depth - 45 - dB RFOP RF output power in 50 Ohms in either frequency band High Power Setting Low Power Setting* dBm dBm RFOPFL RF output power flatness From 315 to 380 MHz, 50 Ohms load - 2 - dB DRFOPV Variation in RF output power with supply voltage 2.5 V to 3.3 V 1.8 V to 3.7 V dB dB PHN Transmitter phase noise At offset: 100 kHz 350 kHz 550 kHz

1.15 MHz

-82 -92 -96 -103 -76 -81 -91 -101 dBc/Hz dBc/Hz dBc/Hz dBc/Hz STEP_22 RF frequency step FXOSC = 24 MHz,for 315MHz module - 1.46484 - kHz STEP_26 RF frequency step FXOSC = 26MHz, for 433,868MHz module - 1.58691 - kHz STEP_26 RF frequency step FXOSC = 26MHz, for 915MHz module 3.17383 - kHz

T el: +86-755-82973805 F ax: +86-755-82973550 E -mail: sales@hoperf.com http:// www.hoperf.com Symbol FXOSC Crystal Oscillator Frequency For 315MHz Module For 433,868,915MHz Module MHz MHz DFXOSC Frequency Variation of the XOSC No crystal contribution - - +/-25 ppm Timing Specifications TS_TR Time from Sleep to Tx mode XTAL dependant, with spec’d XTAL - 650 2000 us TS_HOP0 Channel hop time in Band 0 315 to 390 MHz - 250 500 us TS_HOP1 Channel hop time in Band 1 Maximum hop of 26 MHz* - 200 400 us TOFFT Timer from Tx data activity to Sleep Programmable - ms ms RAMP PA Ramp up and down time - 20 - us T_START Time before CTRL pin mode selection. Time from power on to sampling of CTRL - 200 us + TS_OSC - ms * With different matching networks The oscillator startup time, TS_OSC, depends on the electrical characteristics of the crystal * From the last CTRL falling edge of the Frequency change instruction to transmitter ready (PA ramp up finished) 3. Timing Characteristics The following table gives the operating specifications for the TWI interface of the RFM68CW. Table 5 Serial Interface Timing Specifications Symbol Description Conditions Min Typ Max Unit fCTRL CTRL Clock Frequency - - 10 MHz tch CTRL Clock High time 45 - - ns tcl CTRL Clock Low time 45 - - ns trise CTRL Clock rise time - - 5 ns tfall CTRL Clock Fall time - - 5 ns tsetup DATA Setup time From Data transition to CTRL rising edge 45 - - ns thold DATA hold time From CTRL rising edge to DATA transition 45 - - ns t0, t2 Time at “1” on DATA during Recovery command See Figure 9 and Figure 10 - - 5 us t1 Time at “0” on DATA during Recovery command See Figure 10 5 - - us

868.3 MHz

433.92 MHz

Figure 4. RFM68CW Mode Note Advanced mode is entered only if DATA is held low during CTRL’s rising edge. driving the CTRL pin to the desired state. Figure 5. Power-up

modes hence permit microcontroller-less operation. As described on Figure 4, Advanced mode is entered when accessing the Two Wire Interface (TWI) bus of the RFM68CW. Automatic mode by simply toggling the DATA pin, or in Forced Transmit mode to optimize timings for instance. Figure 6. Frequency Hopping Description

T el: +86-755-82973805 F ax: +86-755-82973550 E -mail: sales@hoperf.com http:// www.hoperf.com 4.5. Frequency Band Coverage The RFM68CW offers several combinations or frequency references and frequency outputs, allowing for maximum flexibility and design of multi-band products: Table 7 Frequency Selection Table Reference Frequency FXOSC Band Setting DA(13) Upper / Lower Frequency Bounds Fstep Frf & Fdev

22 MHz

24 MHz

26 MHz

Frf = DF( 18;0 ) × Fstep Fde v= DA( 12;5 ) × Fstep 4.6. Power Consumption The following typical power consumption figures are observed on the RFM68CW kits. Note that the transmitter efficiency depends on the impedance matching quality, and can be PCB design dependant. The PA matching may be different in each frequency band. Table 8 Power Consumption in Tx mode Frequency Band Conditions Typical Current Drain 310 to 450 MHz Pout=+10dBm, OOK modulation with 50% duty cycle Pout=+10dBm, FSK modulation Pout=0dBm, FSK modulation 11 mA 15 mA 9 mA 860 to 870 MHz Pout=+10dBm, FSK modulation Pout=0dBm, FSK modulation 16.5 mA 10 mA 902 to 928 MHz Pout=+10dBm, FSK modulation Pout=0dBm, FSK modulation 17.5 mA 10.5 mA

T el: +86-755-82973805 F ax: +86-755-82973550 E -mail: sales@hoperf.com http:// www.hoperf.com Table 9 TWI Instruction Table Byte 0 Byte 1 Byte 2 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 Instruction 0 0 0 0 (0000) DA(15:0) Write Application bits 0 0 0 1 1 DF(18:0) Write Frequency bits 0 0 1 0 (0)(0010)(0010) DT(10:0) Write Test bits (pad protected) 0 0 1 1 (0011) DA(15:0) Read Application bits 0 1 0 0 (0100) DF(15:0) Read the 16 least significant Frequency bits 16) Read Chip version, Status and 3 most significant Frequency bits 0 1 1 0 (0110) DS(28:13) Read Bist signature 0 1 1 1 (0111) (1111)(1) DT(10:0) Read Test bits 1 x Discarded, not an instruction All 1 Recovery instruction Notes - The first “0” transmitted to the RFM68CW is required to initialize communication - The following 3 bits (highlighted in blue) determine the type of instruction - The forthcoming bits (highlighted in green) define a protection pattern; any error in these bits voids the instruction

T el: +86-755-82973805 F ax: +86-755-82973550 E -mail: sales@hoperf.com http:// www.hoperf.com 5.2. APPLICATION Configuration Parameters Name Number Description Power &Go 1 Power &Go 2 Mode DA(15) Mode: 0 → Automatic mode 1 → Forced transmit mode Modul DA(14) Modulation scheme: 0 → FSK 1 → OOK 0 1 Band DA(13) Band 0, 310 to 450 MHz Band 1, 860 to 870 MHz and 902 to 928 MHz 1 0 Fdev DA(12:5) RF Frequency deviation in FSK mode only See Table 7 for details 0x06 Fdev= +/-19.2kHz Unused Pout DA(4) Output power range: 0 → 0 dBm 1 → 10 dBm 1 1 TOFFT DA(3) Period of inactivity on DATA before RFM68CW enters Sleep mode in Automatic mode: 0 → 2 ms 1 20 0 1 RES DA(2:0) Reserved 100 100 Table 10 APPLICATION Configuration Parameters Note All changes to the APPLICATION parameters must be performed when the device is in Sleep mode, with the exception of DA(15). Mode can be sequentially written to “1”, and then “0” while the device is in Transmit mode, to speed up the turn off process and circumvent the TOFFT delay. 5.3. FREQUENCY Configuration Parameters Name Number Description Power &Go 1 Power &Go 2 Frf DF(18:0) RF operating frequency See Table 7 for details 0x42CAD Frf=868.3 MHz With 26 MHz reference 0x42C1C Frf=433.92 MHz With 26 MHz reference Table 11 FREQUENCY Configuration Parameters If done in Sleep mode, the Frequency change instruction will be applied next time the RFM68CW is turned on. If Frequency change occurs during transmission, the automated Frequency Hopping sequence described in section [4.4.2] will take place.

T el: +86-755-82973805 F ax: +86-755-82973550 E -mail: sales@hoperf.com http:// www.hoperf.com 5.4. Test Parameters (internal) Ten Test bits DT(9:0) exist in the RFM68CW. They are only use for the industrial test of the device, and therefore they are pad protected. It means that their value cannot be modified without applying a specific logical level to some of the RFM68CW pads during a write access. 5.5. Status Parameters DS(12:5) are read-only bits, organized as follows: Name Number &Go 1 Power &Go 2 RES DS(28:13) Reserved - Chip Version DS(12:5) Chip identification number “0001 0001” --> V1A RES DS(4:0) Reserved - Table 12 Status Read-Only Parameters

T el: +86-755-82973805 F ax: +86-755-82973550 E -mail: sales@hoperf.com http:// www.hoperf.com 6. Application Information 6.1. Reference Design Figure 11:Typical Application Schematic

T el: +86-755-82973805 F ax: +86-755-82973550 E -mail: sales@hoperf.com http:// www.hoperf.com 6.2. NRESET Pin When required, the pin NRESET can be controlled externally, to allow for: ‹ either a delayed Power On Reset (POR) cycle of the RFM68CW, allowing for the companion micro to reset and assign its port directions. This is achieved by connecting a R/C time constant to the NRESET pin. ‹ or an On-the-go Reset of the RFM68CW at any moment in ti me, if required by the application. This is achieved by pulling the NRESET pin low for more than 100 microseconds, then releasing it to high impedance (normal termination). 6.3. TX_READY Pin For timing critical applications, TX_READY pin can be useful to know precisely when the transmitter is ready for operation, and therefore save energy. To this end, TX_READY can optio nally be connected to inform the companion device that the PA ramp up phase has been terminated, hence the RFM68CW is ready for data transmission. 6.4. Low Power Optimization The RFM68CW is designed to reduce the cost of the RF transmitter functionnality. To this end, a single DATA signal can be enough to operate the transmitter, in any of the two Power & Go modes. In this situation, TS_START and TOFFT timings, tabulated in Section 2.4, must be respected, leading to significant periods of time during which the transmitter is On and no valuable information is transmitted. For more demanding applications where energy usage is critical, the RFM68CW offers hardware and software support to accurately control the transmitter On time, and therefore save energy: 6.4.1. 2 Connections: CTRL, DATA If the two signals of the TWI interface can be controlled by the host microcontroller, Tx On time can be accurately controlled as follows: ‹ At the device turn on, instead of waiting for TS_TR (2ms max, but very XTAL dependant), the status flag TX_READY ‹ can be polled on the TWI interface. As soon as the TX_READY flag is set, the microcontroller can start toggling DATA to transmit the useful packet. This method is valid in both Forced Tx and Automatic modes. ‹ At the device turn off, instead of waiting for TOFFT (2 or 20ms), the user can immediately turn off the transmitter after ‹ the transmission of packet, assuming that the Forced Transmit mode was selected. 6.4.2. 3 Connections: CTRL, DATA, TX_READY In applications where the number of connections between th e microcontroller and the RF module is less critical, TX_READY pin can be connected to either a GPIO port, or an ex ternal interrupt port of the micro. The two optimizations described in the former subsection will also be possibl

T el: +86-755-82973805 F ax: +86-755-82973550 E -mail: sales@hoperf.com http:// www.hoperf.com 7. Packaging Information 7.1. S2 Package Outline Drawing Figure 12: S2 Package Outline Drawing

T el: +86-755-82973805 F ax: +86-755-82973550 E -mail: sales@hoperf.com http:// www.hoperf.com 8. Ordering Information RFM68CW —433 S2 P/N: RFM68CW-315S2 RFM68CW module at 315MHz band, SMD Package P/N: RFM68CW-433S2 RFM68CW module at 433MHz band, SMD Package P/N: RFM68CW-868S2 RFM68CW module at 868MHz band, SMD Package P/N: RFM68CW-915S2 RFM68CW module at 915MHz band, SMD Package 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 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. RFM68CW Package Operation Band Mode Type