The iM221A is a compact wireless module for the globally available 2.4 GHz frequency band.

Thanks to specific transceiver properties, the iM221A supports low-power applications where permanent wireless availability is required. Its integrated 128-bit AES coprocessor makes this module is 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 iM221A 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, risk, and costs. With the iM820A, a pin-compatible module for the 868 MHz frequency band is available.

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

For a fast start-up a Starter Kit is available, with which the functions
and the range of application of the WiMOD module can be evaluated.


  • compact radio module for 2.4 GHz
  • wake on radio (WOR1) functionallity with low power consumption *
  • RF datarate from 2.4 kbps up to 250 kbps (500 kbps on demand)
  • 128-bit AES security coprocessor *
  • received signal strength indicator (RSSI 2 )
  • UART and SPI interface (SPI only on demand)
  • sample applications available
  • bootloader functionallity included
  • software and pin-compatible to the iM820A
  • small footprint, solderable like a SMD component
  • integrated PCB antenna or 50 Ω pad
  • RoHS conform

  • locking systems
  • batterie driven sensor-and actuator-systems
  • remote control
  • building automation
  • Metering
  • ...

Frequency range: 2401 MHz to 2482 MHz
Channel spacing: 1 MHz (further on demand)
Modulation: GFSK, 2-FSK
RF output power: typ. 0 dBm (50Ω Pad)
Receiver sensitivity: typ. -101 dBm @ 1 % PER3 & 2.4 kbps
typ. -88 dBm @ 1 % PER & 250 kbps
typ. -80 dBm @ 1 % PER & 500 kbps
RF datarate: 2.4 kbps - 500 kbps
RF range: up to 500 m
Operating voltage: 2.3 V to 3.6 V (typ. 3.0 V)
Current consumption: typ. 23 mA (receive)
typ. 26 mA (transmit @ 0 dBm)
typ. 5 mA (µC active, transceiver off)
typ. 1 µA (power down)
Interfaces: 6 general purpose IOs (analog/digital)
9 digital IOs
  UART, typ. 38.4 kBaud (further on demand)
Dimension (LxWxH): 20 x 25 x 5 mm
Operating temperature: -20°C to +70°C

1 WOR = Wake-On-Radio
2 RSSI = Received Signal Strength Indicator
3 PER = Packet-Error-Rate; packet size = 20 Byte

* This functionality is not part of the standard firmware and only available on demand.
** The sample apps are not supported any more.

Subject to changes without notice.