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WSAL18078 – SIM7070G Cat-M – NB-IoT – GPRS HAT/en

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Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The SIM7070G HAT connects a Raspberry Pi via the 40-pin GPIO header to cellular networks (NB-IoT, Cat-M, GPRS) and GNSS positioning. It supports global bands, MQTT/HTTP(S)/TCP/UDP, and AT commands over USB or UART.

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Technical overview

  • Compatible with Raspberry Pi 2B/3B/Zero/Zero W via the standard 40-pin GPIO header.
  • Supported protocols: TCP, UDP, HTTP, HTTPS, TLS, DTLS, PING, LWM2M, COAP, MQTT.
  • GNSS receiver: 16 channels; GPS, BeiDou, GLONASS, Galileo; NMEA-0183 output; active antenna required.
  • NB-IoT bands: B1/B2/B3/B4/B5/B8/B12/B13/B18/B19/B20/B25/B26/B28/B66/B71/B85.
  • Cat-M bands: B1/B2/B3/B4/B5/B8/B12/B13/B14/B18/B19/B20/B25/B26/B27/B28/B66/B85.
  • Transmission power: Class 5 (typ. 21 dBm).
  • Data rates: NB-IoT UL ≤150 kbps / DL ≤136 kbps; Cat-M UL ≤1119 kbps / DL ≤589 kbps; GPRS UL/DL ≤85.6 kbps; EDGE UL/DL ≤236.8 kbps.
  • Serial interface: 300–3686400 bps; auto-negotiation at 9600/19200/38400/57600/115200 bps.
  • Power: 5 V input; logic voltage selectable 5 V or 3.3 V via 0 Ω resistor; idle current ≈ 41 mA.
  • Dimensions: 30.5 mm × 65 mm; operating temperature −40 °C to +85 °C; storage −45 °C to +90 °C.
  • Only 1.8 V SIM cards are supported; 3 V cards will not fit.

Commands and examples – verify before use:  

AT
AT+CPIN?
AT+CNMP=38
AT+CMNB=2
AT+CSQ
AT+CGREG?
AT+CGNAPN
AT+CPSI?
AT+CNACT=0,1
AT+CNACT?
AT+CNCAT=0,0
AT+SMCONF
AT+CSSLCFG
AT+SMSSL
AT+SMCONN
AT+SMPUB
AT+SMSUB
AT+SMUNSUB
AT+SMSTATE
AT+SMPUBHEX

Notes and version constraints

  • The source contains inconsistent naming: several passages mistakenly refer to SIM7080G even though the product is the SIM7070G. Verify the correct model designation in all documents before use.
  • On first power-on the module may hang; send AT commands repeatedly until OK is returned.
  • Cellular network and GNSS positioning cannot be used simultaneously, according to the source.
  • LTE-M or NB-IoT registration may be delayed depending on region; consult local carriers.
  • TCP tests require mapping the LAN IP and router beforehand.
  • GNSS tests require an open environment and an active antenna; optionally use u-center for locating.
  • The provided Raspberry Pi example code references a path containing SIM7080G – verify before running whether the code actually matches the SIM7070G.
  • Version-sensitive steps: The referenced application notes (e.g., AT Command Manual V1.02/V1.03, MQTT/HTTP/TCP notes) should be checked against the latest version, as command syntax can vary between versions.

Source and revision record

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