HopeRF RFM119W-433S1 433MHz FSK/OOK RF Transmitter Module

The module can be configured in two primary ways. First, you can use the Two-Wire Interface (TWI) to directly write to its internal configuration registers for real-time control. Alternatively, for permanent settings, you can program the embedded EEPROM using HopeRF's RFPDK programming kit, which stores the configuration like frequency, deviation, and data rate, allowing the module to boot with your predefined parameters.

The RFM119W-433S1 is designed for ultra-low-power applications. During active transmission at +10 dBm output power (using FSK at 868.35 MHz), it draws approximately 27.6 mA from a supply between 1.8V and 3.6V. When placed into sleep mode, the current consumption drops to a remarkably low 20 nA, making it ideal for battery-powered devices that wake up periodically to send data before returning to deep sleep.

Transmission is primarily controlled via the DATA pin or the TWI. A transmission starts automatically when a valid level change is detected on the DATA pin. It can be stopped by holding the DATA pin low for a pre-configured time window or by issuing a specific stop command via the Two-Wire Interface. This flexible control scheme allows for both simple pin-driven operation and more sophisticated software-controlled timing via the TWI protocol.