Data Sheet

Wi-FiGeolocation
TheWi-FimoduleisintendedforWi-Figeolocationonly.Itcannotbeusedasanetworkinterface
insteadofusingcellular.AnexternalserviceprovidersuchastheGoogleGeolocationServiceis
requiredformappingWi-Finetworkstoalocation.
ESP32-D2WD
SPIInterface
ConnectedtoSPI1(MISO1,MOSI1,SCK1)
ChipSelect:WIFI_CS(CSDecoder3)
Interrupt:ESP32IO4isconnectedtoMCP23S17I/0ExpanderGPA4.
TheSoMconnectorhasseveralpinsdedicatedtoWi-Fi:
# Pin Function ConnectedTo Description
11 WIFI_EN IO WIFI&IOEX ESP32enable.Canbecontrolledbythispinorsoftware.
12 WIFI_BOOT IO WIFI&IOEX ESP32bootmode.Canbecontrolledbythispinorsoftware.
13 WIFI_TXD OUT WIFI ESP32serialTX
14 WIFI_RXD IN WIFI ESP32serialTX
TheWIFI_ENpinturnsontheWi-Fimodule.LOW=Off,HIGH=On.Thedefaultisoff(witha100K
weakpull-down).ItcanbeturnedonfromPin11ontheSoMconnection,orinsoftwarefromthe
MCP23S17I/0Expander0.3.
TheWIFI_BOOTpinenablesprogrammingmode.
3.3VRegulator
TexasInstrumentsTPS62291
1.0Aat3.3V
PowersnRF52840MCUandESP32Wi-Fimodule
Canbeusedbyyourbaseboardtopower3.3Vcomponents
3.3VsupplycanbepowereddownfromtheRTC/Watchdog
nRF52840
Bluetooth®5,2.4GHz
95dBmsensitivityin1MbpsBluetooth®lowenergymode
103dBmsensitivityin125kbpsBluetooth®lowenergymode(longrange)
20to+8dBmTXpower,configurablein4dBsteps
4GLTEcellularcharacteristicsforEG91-EX
Parameter Value
Protocolstack 3GPPRelease13
RAT LTECat1
LTEFDDBands Band28(700MHz)
Band20(800MHz)
Band8(900MHz)
Band3(1800MHz)
Band1(2100MHz)
RADIOSPECIFICATIONS