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MeshConnect EM357 High Temp Mini Modules

Part number



 The MeshConnect™ EM357 High Temperature (High Temp) Mini Modules from California Eastern Laboratories (CEL) combine high performance RF solutions with the market's premier ZigBee® stack (EmberZNet PRO™) from Silicon Labs. These modules are specifically designed to address the thermal challenges associated with heat-intensive applications.
CEL's MeshConnect™ EM357 High Temp Mini Modules (ZICM357SP2-1-HT and ZICM357SP2-1C-HT) are based on the Ember EM357 IC. This IC is a single-chip solution, compliant with ZigBee specifications and IEEE 802.15.4, a complete wireless solution for all ZigBee applications.
These High Temp Mini Modules are suitable for applications such as solar and lighting controls where the temperature requirements may exceed the industrial range specs. The modules are designed and built using high temperature components to provide a robust solution without compromising performance in extreme environments.
CEL's MeshConnect modules are certified and qualified, enabling customers to reduce their development cost and risk, while reducing time to market.

Key Features

  • Operating Temperature: -40 ℃ to 110 ℃
  • Transmit Power: +20 dBm
  • Rx Sensitivity: -103 dBm
  • RF Link Budget: +123 dB

Key Documents

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  • Key Specs & Features
  • Documentation & Videos
  • Evaluation Kits
  • Dev Tools & Software
  • Markets & Applications




  • Operating Temperature: -40 ℃ to 110 ℃
  • Transmit Power: +20 dBm
  • Rx Sensitivity: -103 dBm
  • RF Link Budget: +123 dB
  • Advanced ARM® Cortex-M3 processor
    • 192 kB Flash; 12 kB SRAM
    • SPI Master / Slave, TWI and UART
    • Timers, Serial Wire / JTAG Interface
    • 5-channel, 14-bit ADC
    • Up to 22 GPIO Pins


    • Network Speed: 250 kbps
    • 16 RF Channels
    • Advanced Power Management
    • Software support:
      Industry's premier ZigBee PRO stack (EmberZNet PRO™)
    • Supports Mesh Networks
    • Integrated PCB Antenna
      • FCC, and IC Certifications
    • External Antenna
      • Optional RF port for External Antenna
      • FCC, IC Certifications for Nearson
        S181AH-2450S Antenna
    • Pin compatible Mini Modules:
      • ZICM357SPx, ZICM3588SPx, and ZICM357SPx-HT are pin compatible.

    Evaluation Kits are not applicable for EM357 High Temp Mini Modules


    MeshConnect EM35x Programming Fixture

    CEL's MeshConnect EM35x Mini Modules Programming Fixture is a
    programming assembly designed to be used with the CEL ZICM35xSPx
    MeshConnect™ Mini Modules. It is useful for production programming
    or during application development when multiple firmware images are
    required to be loaded into a CEL Mini Module for testing and debugging.
    The programming assembly must be used in conjunction with an Ember
    Debug/InSight Adapter (ISA3) from Silicon Labs.

    Related Documents

    For more details on the Silicon Labs Ember Debug/Insight Adapter (ISA3), visit

    Design Support Files

    MeshConnect Test Tool

    The MeshConnect Test Tool is a graphical tool for windows that allows for easy measurement of all module hardware parameters.

    Manufacturing Hardware Evaluation Software

    When used in conjunction with CEL's MeshConnect ZICM35x Test Tool, the Manufacturing Hardware Evaluation software allows for easy measurement of all hardware parameters.
    Built for ZICM357 modules running on a CEL evaluation board.     
    Built for ZICM357 modules running on an Ember evaluation board.

    Mechanical Land Footprint Files (DXF, DWG)

    Mentor Graphics PADS Logic and Layout Example (ln9)


    Key applications include:

    • Smart Energy (Thermostats, Meters, In-Home Displays and Smart Plugs)
    • Home Automation and Control (Energy Management, Security Devices and HVAC Controls)
    • Building Automation and Control
    • Commercial and Residential Lighting (Fixtures and Control)
    • Solar Inverters and Control
    • General ZigBee Wireless Sensor Networking