The iM820A is a compact wireless module for the 868 MHz frequency band. Thanks to specific transceiver properties, the iM820A supports low-power applications where permanent wireless availability is required. Its integrated 128-bit AES coprocessor makes this module particularly appropriate for security-related applications. It has a transceiver, microcontroller and an integrated PCB antenna. Of course you can get the module with a 50Ω port for connecting an external antenna. The iM820A can be soldered directly on the target hardware just as usual SMD components. The integration of an RF system in a new or existing product is therefore significant simplified, which reduces development time and costs. With the iM221A, a pin-compatible module for the 2.4 GHz frequency band is available.

The iM820A is not available via webshop. Please make a request to our sales-team.


Embedded Software

We also provide software to control the wireless communication and permit the implementation of common use cases. The UART interface connects to a host system via host controller interface (HCI) and allows simple configuration of the wireless and application parameters. Software updates are also made via UART interface using a bootloader already integrated into the module. We offer customizing to special requirements as a service.

WiMOD firmware - standard applications (AppStarterKit)

  • Chat – bi-directional data transfer between two or more modules
  • Radio Link Test – qualitative assessment of the radio link between two modules
  • Remote Control – remote switching of outputs at the remote module
  • Sensor Control – sensor data transmission between two or more modules
  • Sensor Network – sensor network with a central data logge

WiMOD-firmware - sample applications (SampleApps **)

  • Transparent Data Exchange – transparent data channel for cable replacement
  • Remote Control – simple remote control application
  • Range Demo – simple range test

Key Features

  • Wireless module for 868 MHz band
  • Wake on radio (WOR1) functionallity with low power consumption *
  • RF datarate from 1.2 kbps up to 180 kbps
  • 128-bit AES coprocessor *
  • Received signal strength indicator (RSSI2)
  • UART and SPI interface (SPI only on demand)
  • Sample applications available
  • Software- and pin- compatible with iM221A
  • Bootloader functionallity included
  • Small footprint, solderable like a SMD component
  • Integrated PCB antenna or 50Ω pad
  • RoHS conform

Application Area

  • Locking systems
  • Batterie driven sensor- and actuator- systems
  • Remote control
  • Building automation
  • Metering
Frequency range863 MHz to 870 MHz
(902 MHZ to 928 MHz on demand)
(433 MHZ on demand)
ModulationGFSK, 2-FSK
RF output powertyp. 7 dBm (50Ω pad)
Receiver sensitivitytyp. -110 dBm @ 1 % PER3 1.2 kbps
typ. -94 dBm @ 1 % PER & 180 kbps
RF data rate1.2 kbps – 180 kbps
RF Rangeup to 1100m line of sight
Operatung voltage2.3 V to 3.6 V (typ. 3.0 V)
Current consumptiontyp. 23 mA (receive @ 180 kbps)
typ. 31 mA (transmit @ 7 dBm)
typ. 5 mA (controller active, transceiver off)
typ. 1 µA (power down)
IO’sUART, typ. 38.4 kBaud (further on demand)
Interfaces6 general purpose IOs (analog/digital)
9 digital IOs
Dimensions (LxWxH)20 x 25 x 5 mm
Operating temperature-20°C up to +70°C