SA878 G-NICE | Alldatasheet
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www.nicerf.com SA878 NiceRF Wireless Technology Co., Ltd. Rev 1.5 sales@nicerf.com -2- Catalogue Note: Revision History Revision Date Comment V1.0 2018-7 Firstrelease V1.1 2022-8 Correctthecommunicationprotocol V1.2 2023-8 Updatefrequency V1.3 2024-10 Updatefrequency V1.4 2025-06 Updatecrystaloscillatorparameters V1.5 2025-07 UpdateMechanismDimension
www.nicerf.com SA878 NiceRF Wireless Technology Co., Ltd. Rev 1.5 sales@nicerf.com -3- 1. Descriptions SA878 is a cost-effective integrated professional walkie-talkie module, built-in high-speed micro controller,high-performance RF transceiver chip and RF power amplifier,and provides a standard serial port to communicate with the module, so that the module's related parameters can be set quickly and easily. Function control. Users only need to connect an audio amplifier, microphone, and speaker to this module to work as a small walkie-talkie. The simplified interface and ultra-small size make this module widely available, and can be easily and quickly embedded in various handheld devices to improve the overallperformanceoftheterminalproducts. 2. Features UHFband400~480MHz Transmitreceivefrequencyindependent Bandwidth12.5KHz RSSIsignalstrengthindication Opendistanceis5kilometers Highreceivingsensitivity:-124dBm Highlyintegratedsmallvolume 38-levelCTCSSanalogsub-audiocode 166-levelpositivephase, invertedCDCSSdigitalsub-audio 8-levelsquelch 8-leveladjustablevolume Highandlowpoweroptions(1.6W/1.8W) Wideoperatingvoltage3.3-5.5V Built-inEEPROM,datasavedevenpoweredoff Stablewith0.5ppmTCXOcrystal 3. Application Smallwalkietalkie Ignoretheintercomsystem Buildingcommunitysecuritysystem Outdoorsportsproducts Audiomonitoringsystem 4. Internal block diagram
www.nicerf.com SA878 NiceRF Wireless Technology Co., Ltd. Rev 1.5 sales@nicerf.com -4- 5. Specification Parameter Test condition Min Typ. Max Unit Powersupply 3.3 4.2 5.5 V WorkingTemperaturerange -30 25 70 ℃ Current Consumption Sleepcurrent ≤1 uA RXcurrent 60 mA TXcurrent（Highpower） 900 950 mA TXcurrent（lowpower） 450 550 mA Transmitting RF Parameters Frequencyrange UHF 400 480 MHz TXpower（highpower） @VCC=4.0V 31 32.5 33 dBm TXpower（lowpower） 24 25 26 dBm Modulationfrequency @1.5KHz/2.5KHz Frequencyoffset 10 mV Audiomodulationdistortion @1.5KHz/2.5KHz Frequencyoffset 2 5 % SignaltoNoiseRatio @1.5KHz/2.5KHz Frequencyoffset 38 40 45 dB adjacent-channelpower @12.5Koffset -60 dBc CTCSSModulationfrequency 0.35 0.5 0.75 KHz Receiving RF Parameters Receivingsensitivity 13dBOutputvoice signalratio -124 dBm ReceivingSNR @1.5KHz Frequencyoffset 45 50 dB Audiooutputamplitude 700 mV AudioOutputimpedance 200 OHm
www.nicerf.com SA878 NiceRF Wireless Technology Co., Ltd. Rev 1.5 sales@nicerf.com -5- 6. Typical Application Schematic 7. Communication protocol Themodule providesa good userinterface (standard serial port), the user can send commandsthrough the serial port to adjust and read the module parameters. The memory is integrated inside the module, andtherelatedparametersoftheconfigurationcanbestored. Instruction transmission format: Allinstructionsstartwith"AT"andendwith<CR><LF>. Afterthemoduleisrunning,thestandardsettingsofthecommunicationserialportare: Rate:9600bps Databits:8bits Stopbits:1bit Parity:None Instruction return format: Returnsastringassociatedwiththesendinstruction,endingwith<CR><LF>. Frame format definition: AllinstructionsinthecommunicationprotocolaretransmittedinASCII. Terminaltomodulecommunicationtakestheform:AT+DMOXXX The module adopts the form of terminal communication: +DMOXXX (Note: the terminal does not needtoreturn）
www.nicerf.com SA878 NiceRF Wireless Technology Co., Ltd. Rev 1.5 sales@nicerf.com -6- Instruction description AT+DMOCONNECT Handshake instruction Description: The handshake instruction is intended to prove that the module is connected and operatingnormally.Eachtimetheterminalsendsit,themodulereturnsafterreceivingthiscommand. Repeat response command; if the 3 handshake command does not receive the module response, the terminalshouldrestartthemodule. Format：AT+DMOCONNECT Example：AT+DMOCONNECT +DMOCONNECT Handshake response command Description: The module handshake response command, the module must respond to the first time afterreceivingtheDMOCONNECTcommand. Format：+DMOCONNECT:0 Example：+DMOCONNECT:0 ParameterXdescription:0—>Normalworkingstatus S+Sweep command Description:Setthefrequencytoscan. Format：S+scanRF Example：S+455.2250 Parameterdescription: scanRF:thefrequencytoscan S=Sweep response command Description: Sweep response command, the module will sweep the frequency after receiving the sweepcommand,sweepthefrequencyandreturntothesweepresult. Format：S=X Parameterdescription： 0—>Thefrequencytobescannedhasasignal 1—>Thereisnosignaltosweepthefrequency
www.nicerf.com SA878 NiceRF Wireless Technology Co., Ltd. Rev 1.5 sales@nicerf.com -7- AT+DMOSETGROUP Set group instruction Description：Settheworkingparametersofthemodule. Format：AT+DMOSETGROUP=TXPOWER，TFV，RFV，Tx_CXCSS，SQ，Rx_CXCSS Example1：AT+DMOSETGROUP=0,415.1250,415.1250,0012,4,0013 Example2：AT+DMOSETGROUP=0,415.1250,415.1250,754N,4,445I ParameterDescription： TXPOWER:Highandlowpowersettings(0:highpower;1:lowpower) TFV：Transmitfrequencyvalue（134.0000M～174.0000M,400.0000M～470.0000M） RFV：Receivingfrequencyvalue（134.0000M～174.0000M,400.0000M～470.0000M） Note: Thetransmittingfrequencyandthereceivingfrequencycanbethesameordifferent TheTXPOWERbitandtheH/Lpinjointlycontrolthetransmitpowerofthemodule.Aslongasone sideislowpower,themoduletransmitsatlowpower. Tx_CXCSS：TXCXCSSValue SQ：Squelchlevel(0～8) （0：Monitormode,scanmodecannotbeused0） Rx_CXCSS：RXCXCSSValue (Note: different CXCSS values can be used for transmission and reception, 0000: no coding 0001-0038:CTCSSAftertheletter:CDCSS,thecodeisshownintheattachedtable1) +DMOSETGROUP Set group response command Description:Afterreceivingthesetupgroupcommand,themodulereturnstheoperationresult. Format：+DMOSETGROUP:X Example：+DMOSETGROUP:0 ParameterXdescription:0 —>Success，1 —>Datasettingisoutofrange AT+DMOSETVOLUME Set the volume command Description：Setthevolumelevelofthemodule Format：AT+DMOSETVOLUME=X Example：AT+DMOSETVOLUME=1 ParameterXdescription:Thevolumelevelparameterrangesfrom1to8 +DMOSETVOLUME Volume setting response command
www.nicerf.com SA878 NiceRF Wireless Technology Co., Ltd. Rev 1.5 sales@nicerf.com -8- Description：Setthemodule'svolumelevelresultresponse Format：+DMOSETVOLUME:X Example：+DMOSETVOLUME:0 ParameterXdescription：0—>Setsuccessfully 1—>Setupfailed AT+RSSI Read signal strength command Description：Readthesignalstrengthofthemodule Format：AT+RSSI? Example：AT+RSSI? RSSI=XXX Read signal strength response command Description：Readmodule'ssignalstrengthresultresponse Format：RSSI:XXX Format：RSSO:010 Parameter X description：Current signal strength value, the larger the value, the stronger the signal strength AT+SETFILTER Set filter instructions Description：Setthefilterofthemodule Format：AT+SETFILTER=PRE/DE-EMPH,HIGHPASS,LOWPASS Example：AT+SETFILTER=0,0,0 Parameter description ： PRE/DE-EMPH,0 means pre-emphasis/de-emphasis on, and 1 means pre-emphasis/de-emphasisoff; HIGHPASS,0meansthehigh-passfilterison,and1meansthehigh-passfilterisoff; LOWPASS,0meansthelow-passfilterison,and1meansthelow-passfilterisoff; +DMOSETFILTER Filter setting response command Description：Setthemodule'sfilterresultresponse Format：+DMOSETFILTER:X Example：+DMOSETFILTER:0 ParameterXdescription： 0—>Setsuccessfully 1—>Setupfailed
www.nicerf.com SA878 NiceRF Wireless Technology Co., Ltd. Rev 1.5 sales@nicerf.com -9- 8. Pin definition Pin NO. Pin name I/O state
1 MIC_IN Microphoneorlinein
2 TXD TXDofthemoduleandconnecttoexternalRXD
3 RXD RXDofthemoduleandconnecttoexternalTXD
4、5、6 NC Notconnected
7 ANT connect50ohmantenna
8、9、10 GND Grounding
11 VCC Connectpowerpositive
12 H/L
high/low output power control; Leave open for high output power，low level to low output power. (Please kindly note: this pin can NOT be connectedtoVDDorhighlevelofcmosoutput)
13 CS Power Down control, "0" for power down mode; "1" for the normal work;
14 PTT ModuleInput,Transmitting/receivingcontrol,"0" force themoduletoenter
TXstate;and"1"toRxstate 15 +3.3V 3.3Vvoltageoutputpin,canbeconnectedto50mAload
16 LINE_OUT Audiooutput(between200mv-1400mv,canbesetbysoftware)
17 NC Notconnected
18 SPKEN Receive signal indication pin (can externally control audio power
amplifier),activehighlevel,defaultlowlevel 19、20 GND Grounding
www.nicerf.com SA878 NiceRF Wireless Technology Co., Ltd. Rev 1.5 sales@nicerf.com -10- 9. Mechanism Dimension(Unit:mm) 10. FAQ a) Whymodulecannotcommunicateproperly？ 1) Checkifthereispowerconnectionerror； 2) CheckifModuleisinnormalcommunicationmode； 3) Checkiffrequency,channel,andmutearesame； 4) Checkifmoduleisdamaged； b) Whytransmissiondistanceisnotfarasitshouldbe？ 1) Powersupplyrippleistoolarge； 2) Theantennatypesdonotmatch,ornotinstalledproperly； 3) Thesamefrequencyinterference； 4) Thesurroundingenvironmentisharsh,stronginterferencesources.
www.nicerf.com SA878 NiceRF Wireless Technology Co., Ltd. Rev 1.5 sales@nicerf.com -11- Appendix 1：Mute on the interface display and send correspondence table ★Note: The N code is encoded as the corresponding I code code bitwise inversion, such as 023N codeis023Icodebitwisenegation: 023N=~023I=00110111111000111001000 Code Transform Bit Pattern Hex Bit Pattern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
www.nicerf.com SA878 NiceRF Wireless Technology Co., Ltd. Rev 1.5 sales@nicerf.com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
www.nicerf.com SA878 NiceRF Wireless Technology Co., Ltd. Rev 1.5 sales@nicerf.com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
www.nicerf.com SA878 NiceRF Wireless Technology Co., Ltd. Rev 1.5 sales@nicerf.com -14- Appendix 2：SMD Reflow Chart