Semtech LR1110 - LR1110 Low Battery Detector

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LR1110

User Manual Rev.1.0

UM.LR1110.W.APP March 2020

37 of 130

Semtech

www.semtech.com

Figure 5-1: LR1110 POR and BRN Functions

5.5 Low Battery Detector

The Low Battery Detector (LBD) detects when the supply voltage VBAT drops below 1.88 V (typ). The LBD indication is given

through an interrupt signal, hence minimizing the host activity in critical supply voltage conditions. The LBD IRQ shall be

activated though the command SetDioIrqParams().

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Main Page

Table of Contents2
Introduction12
Scope12
Overview12
Figure 1-1: LR1110 Block Diagram12
System Modes14
Modes Description14
Standby14
Figure 2-1: LR1110 Modes and Transitions14
Power down15
Sleep15
Table 2-1: Setstandby Command15
Table 2-2: Setsleep Command15
Table 2-3: Sleepconfig Parameter16
Table 2-4: Sleep Mode Summary16
RX Mode17
TX Mode17
FS Mode18
GNSS Scanning Mode18
Wi-Fi Passive Scanning Mode18
DSP Mode18
Startup Sequence18
Reset18
Power-On-Reset and Brown-Out Reset19
Nreset19
Reboot Command19
Calibrations19
Table 2-5: Reboot Command19
Calibimage20
Calibrate20
Table 2-6: Calibimage Command20
Table 2-7: ISM Band20
Table 2-8: Calibrate Command20
Getversion21
Table 2-9: Calibparams Command21
Table 2-10: Getversion Command21
Table 2-11: Getversion Response21
Modes Transitions & Timings22
Table 2-12: Mode Transitions22
Host-Controller Interface23
Write Commands23
Read Commands23
Status Registers23
Figure 3-1: Write Command Timing Diagram23
Figure 3-2: Read Command Timing Diagram23
Stat124
Stat224
Table 3-1: Stat124
Table 3-2: Stat224
Busy25
Errors25
Geterrors25
Figure 3-3: BUSY Timing Diagram25
Clearerrors26
Table 3-3: Geterrors Command26
Table 3-4: Geterrors Response26
Table 3-5: Clearerrors Command26
Memory Access27
Writeregmem3227
Readregmem3227
Table 3-6: Writeregmem32 Command27
Table 3-7: Writeregmem32 Command (Cont.)27
Table 3-8: Readregmem32 Command27
Writeregmemmask3228
Writebuffer828
Table 3-9: Readregmem32 Response28
Table 3-10: Writeregmemmask32 Command28
Table 3-11: Writeregmemmask32 Command(Cont.)28
Table 3-12: Writebuffer8 Command28
Readbuffer829
Clearrxbuffer29
Table 3-13: Readbuffer8 Command29
Table 3-14: Readbuffer8 Response29
Table 3-15: Clearrxbuffer Command29
Gpios30
Interrupts30
Description30
Table 4-1: Irqtoenable Interruption Mapping30
Commands31
Table 4-2: Getstatus Command31
Table 4-3: Setdioirqparams Command32
Table 4-4: Clearirq Command32
RF Switch Control33
Setdioasrfswitch33
Table 4-5: Setdioasrfswitch Command33
Temperature Sensor34
Table 4-6: Gettemp Command34
Table 4-7: Gettemp Response34
Power Distribution35
Power Modes35
Over Current Protection35
VBAT Measurement35
Table 5-1: Setregmode Command35
Table 5-2: Power Regulation Options35
Power-On-Reset and Brown-Out-Reset36
Table 5-3: Getvbat Command36
Table 5-4: Getvbat Response36
Low Battery Detector37
Figure 5-1: LR1110 por and BRN Functions37
Clock Sources38
RC Oscillators Clock References38
High-Precision Clock References38
Khz Crystal38
Table 6-1: Configlfclock Command38
32 Mhz Crystal39
32 Mhz TCXO39
Figure 6-1: TCXO39
Table 6-2: Settcxomode Command40
Table 6-3: TCXO Supply Voltage Programming Values40
Sub Ghz Radio41
Description41
Figure 7-1: Sub-Ghz Radio41
Commands42
Setrffrequency42
Setrx42
Table 7-1: Setrffrequency Command42
Table 7-2: Setrx Command42
Settx43
Autotxrx43
Table 7-3: Settx Command43
Table 7-4: Autotxrx Command43
Setrxtxfallbackmode44
Setrxdutycycle44
Table 7-5: Setrxtxfallbackmode Command44
Table 7-6: Setrxdutycycle Command44
Figure 7-2: LR1110 Current Profile During RX Duty Cycle Operation45
Figure 7-3: RX Duty Cycle Upon Preamble Detection45
Stoptimeoutonpreamble46
Table 7-7: Stoptimeoutonpreamble Command46
Getrssiinst47
Getstats47
Table 7-8: Getrssiinst Command47
Table 7-9: Getrssiinst Response47
Table 7-10: Getstats Command47
Table 7-11: Getstats Response47
Resetstats48
Getrxbufferstatus48
Table 7-12: Resetstats Command48
Table 7-13: Getrxbufferstatus Command48
Table 7-14: Getrxbufferstatus Response48
Setrxboosted49
Table 7-15: Setrxboosted Command49
Modems50
Modem Configuration50
Setpackettype50
Figure 8-1: Lora® /(G)FSK Command Order50
Table 8-1: Setpackettype Command50
Getpackettype51
Lora® Modem Description51
Lora® Modulation Principle51
Table 8-2: Getpackettype Command51
Table 8-3: Getpackettype Response51
Figure 8-2: Lora® Signal Bandwidth52
Lora® Packet Format53
Figure 8-3: Lora® Packet Format53
Channel Activity Detection54
Lora® Commands55
Setmodulationparam55
Table 8-4: Setmodulationparam Command55
Table 8-5: Spreading Factor55
Table 8-6: Lora® Modulation Bandwidth55
Setpacketparam56
Table 8-7: Coding Rate56
Table 8-8: Lowdatarateoptimize56
Table 8-9: Setpacketparam Command56
Setcad57
Setcadparams57
Table 8-10: Setcad Command57
Table 8-11: Setcadparams Command57
Lorasynchtimeout58
Setlorapublicnetwork58
Table 8-12: Cadexitmode Parameter Definition58
Table 8-13: Lorasynchtimeout Command58
Table 8-14: Setlorapublicnetwork58
Getpacketstatus59
G)FSK Modem Description59
G)FSK Modulation Principle59
Table 8-15: Getpacketstatus Command59
Table 8-16: Getpacketstatus Response59
G)FSK Packet Engine60
G)FSK Packet Format60
Figure 8-4: Fixed-Length Packet60
Figure 8-5: Variable-Length Packet61
G)FSK Commands62
Setmodulationparam62
Figure 8-6: (G)FSK Whitening62
Table 8-17: Setmodulationparam Command62
Table 8-18: Pulseshape Parameter63
Table 8-19: Bandwidth Parameter63
Setpacketparam64
Table 8-20: Setpacketparam Command64
Table 8-21: Pbldetect: Preamble Detector Length64
Table 8-22: Addrcomp65
Table 8-23: Packettype65
Table 8-24: Crctype65
Table 8-25: Whitening65
Setgfsksyncword66
Setpacketadrs66
Setgfskcrcparams66
Table 8-26: Setgfsksyncword Command66
Table 8-27: Setpacketadrs Command66
Table 8-28: Setgfskcrcparams Command66
Setgfskwhitparams67
Data Buffer67
Data Buffer in Receive Mode67
Table 8-29: Setgfskwhitparams Command67
Table 8-30: Getrxbufferstatus Command68
Table 8-31: Getrxbufferstatus Response68
Table 8-32: Readbuffer8 Command68
Table 8-33: Readbuffer8 Response68
Data Buffer in Transmit Mode69
RSSI Functionality69
Table 8-34: Clearrxbufferstatus Command69
Table 8-35: Writebuffer8 Command69
Table 8-36: RSSI Information Origin and Meaning69
Power Amplifiers71
Figure 9-1: LR1110 Power Amplifiers71
PA Supply Scheme72
Figure 9-2: PA Block Diagram72
Low Power PA73
High Power PA73
Figure 9-3: Low Power PA VR_PA Voltage Vs. Txpower73
PA Output Power74
Low Power PA74
Figure 9-4: High Power PA VR_PA Voltage Vs. Txpower74
Figure 9-5: Low Power PA Output Power Vs. Txpower74
High Power PA75
PA Current Consumption76
Low Power PA76
Figure 9-6: HP PA Output Power Vs. Txpower76
Figure 9-7: IDDTX Vs Txpower, Low Power PA, DC-DC Configuration76
Figure 9-8: IDDTX Vs Txpower, Low Power PA, LDO Configuration77
High Power PA78
Figure 9-9: IDDTX Vs Txpower, High Power PA, DC-DC Configuration78
Figure 9-10: IDDTX Vs Txpower, High Power PA, LDO Configuration79
Impedance Matching Networks80
Multi-Band Operation80
RF Switch Implementation80
Table 9-1: Optimized Settings for LP PA with the same Matching Network80
Table 9-2: Optimized Settings for HP PA with the same Matching Network80
Direct-Tie Implementation81
Figure 9-11: RF Switch, Double PA Operation81
Figure 9-12: RF Switch, Single PA Operation (High Power PA Example)81
Figure 9-13: Single Tie Implementation: Only One PA Used (High Power PA Example)81
Figure 9-14: Single Tie Implementation: both Pas Used (High Power PA Example)81
Commands82
Setpaconfig82
Settxparams82
Table 9-3: Setpaconfig Command82
Table 9-4: Dutycycle Parameter82
Table 9-5: Settxparams Command82
Table 9-6: Ramptime83
Wi-Fi Passive Scanning84
Principle of Operation84
Figure 10-1: Wi-Fi Passive Scanning Sequence84
Wifiscan85
Table 10-1: Wifiscan Command85
Wi-Fi Passive Scanning Results86
Wi-Fi Passive Scanning Result Formats86
Basic Result Format87
Full Result Format87
Table 10-2: Basic Results Format Per MAC Address87
Table 10-3: Full Results Format Per MAC Address88
Table 10-4: Wi-Fi Datarateid Field88
Table 10-5: Wi-Fi Channel ID Field89
Table 10-6: Wi-Fi Macvalidation Field89
Table 10-7: Wi-Fi Frame Control Field89
Table 10-8: Subtype Description90
Wifigetnbresults91
Wifireadresults91
Table 10-9: Wifigetnbresults Command91
Table 10-10: Wifigetnbresults Response91
Table 10-11: Wifireadresults Command91
Table 10-12: Wifireadresults Response91
Wifiresetcumultimings92
Wifireadcumultimings92
Table 10-13: Wifiresetcumultimings Command92
Table 10-14: Wi-Fi Cumulative Timings Description92
Table 10-15: Wifireadcumultimings Command93
Table 10-16: Wifireadcumultimings Response93
GNSS Scanning94
GNSS Geolocation System Overview94
GNSS Principle of Operation95
Figure 11-1: GNSS System Overview95
GNSS API Functions96
Setgnssconstellationtouse96
Gnsssetmode96
Table 11-1: Gnsssetconstellationtouse96
Table 11-2: Gnsssetmode96
Gnssautonomous97
Gnssassisted97
Table 11-3: Gnssautonomous Command97
Table 11-4: Gnssassisted Command97
Gnsssetassistanceposition98
GNSS Scanning Results Description98
NAV Message Description98
Table 11-5: Gnsssetassistanceposition Command98
Gnssgetresultsize Command99
Figure 11-2: NAV Message Format99
Gnssreadresults100
Table 11-6: Gnssgetresultsize Command100
Table 11-7: Gnssgetresultsize Response100
Table 11-8: Gnssreadresults Command100
Table 11-9: Gnssreadresults Response100
Gnssgetnbsvdetected101
Gnssgetsvdetected101
Table 11-10: Gnssgetnbsvdetected Command101
Table 11-11: Gnssgetnbsvdetected Response101
Table 11-12: Gnssgetsvdetected Command101
Table 11-13: Gnssgetsvdetected Response101
Gnssgetconsumption102
GNSS Almanac102
Table 11-14: Gnssgetconsumption Command102
Table 11-15: Gnssgetconsumption Response102
Almanac Full Update103
Table 11-16: Gnssalmanacfullupdate103
Table 11-17: Almanacfullupdatepayload103
Table 11-18: Almanacheader103
Table 11-19: Svalmanac Format103
Crypto Engine105
Description105
Cryptographic Keys Definition105
Table 12-1: Cryptographic Keys Usage and Derivation105
Commands107
Cestatus107
Cryptosetkey107
Table 12-2: Cryptosetkey Command107
Table 12-3: Cryptosetkey Response107
Cryptoderiveandstorekey108
Cryptoprocessjoinaccept108
Table 12-4: Cryptoderiveandstorekey Command108
Table 12-5: Cryptoderiveandstorekey Response108
Table 12-6: Cryptoprocessjoinaccept Command108
Cryptocomputeaescmac109
Table 12-8: Cryptocomputeaescmac Command109
Table 12-9: Cryptocomputeaescmac Response109
Table 12-7: Cryptoprocessjoinaccept Response109
Cryptoverifyaescmac110
Table 12-10: Cryptocomputeaescmac Command Example110
Table 12-11: Cryptocomputeaescmac Response Example110
Table 12-12: Cryptoverifyaescmac Command110
Table 12-13: Cryptoverifyaescmac110
Cryptoaesencrypt01111
Cryptoaesencrypt111
Table 12-14: Cryptoaesencrypt01 Command111
Table 12-15: Cryptoaesencrypt01 Response111
Table 12-16: Cryptoaesencrypt Command111
Cryptoaesdecrypt112
Table 12-18: Cryptoaesdecrypt Command112
Table 12-19: Cryptoaesdecrypt Response112
Table 12-17: Cryptoaesencrypt Response112
Cryptostoretoflash113
Cryptorestorefromflash113
Table 12-20: Cryptostoretoflash Command113
Table 12-21: Cryptoaesdecrypt Response113
Table 12-22: Cryptorestorefromflash Command113
Table 12-23: Cryptorestorefromflash Response113
Cryptosetparam114
Cryptogetparam114
Table 12-24: Cryptosetparam Command114
Table 12-25: Cryptosetparam Response114
Table 12-26: Cryptogetparam Command114
Table 12-27: Cryptogetparam Response114
LR1110 Provisioning115
Description115
Provisioning Commands115
Getdeveui115
Getappeui115
Table 13-1: Getdeveui Command115
Table 13-2: Getdeveui Response115
Readdevicepin116
Table 13-3: Getappeui Command116
Table 13-4: Getappeui Response116
Table 13-5: Readdevicepin Command116
Table 13-6: Readdevicepin Response116
Test Commands117
Regulatory Overview117
Etsi117
Fcc117
Table 14-1: ETSI Test Signals117
Commands118
Settxcw118
Settxinfinitepreamble118
Table 14-2: Settxcw Command118
Table 14-3: Settxinfinitepreamble Command118
List of Commands119
Register / Memory Access Operations119
System Configuration / Status Operations119
Table 15-1: Register / Memory Access Operations119
Table 15-2: System Configuration / Status Operations119
Radio Configuration / Status Operations121
Table 15-3: Radio Configuration / Status Operation121
Wi-Fi Configuration / Status Operations123
Table 15-4: Wi-Fi Scanning Configuration / Status Operations123
GNSS Configuration / Status Operations124
Cryptoelement Configuration / Status Operations124
Table 15-5: GNSS Scanning Configuration / Status Operations124
Table 15-6: Cryptoelement Configuration / Status Operations124
Revision History126
Table 16-1: Revision History126

Semtech LR1110 - LR1110 Low Battery Detector

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