HOPERF RF75 RF Module User Manual

Below you will find brief information for RF75. This user manual details the configurable SPI settings for various frequencies (250KHz, 1MHz, 2MHz), outlines the steps for adjusting TX output power, and specifies the fixed RSSI thresholds. It also provides essential guidance on connecting the RF75 module to 5V MCU IOs using a 2kohm resistor, ensuring proper operation within your application.

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HOPERF RF75 User Manual | AI Chat & PDF Download | Manualzz

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Key features

  • Configurable Bank1 SPI settings for 250KHz, 1MHz, 2MHz

  • Adjustable TX output power from -25dBm to 7dBm

  • Fixed RSSI thresholds for optimal signal detection

  • Supports 5V IO operation with external resistors

  • Includes application schematics for integration

Frequently asked questions

The Bank1 SPI settings vary by frequency: for 250KHz use 0xDB8A96F9, for 1MHz use 0x1B8296F9, and for 2MHz use 0xDB8296F9, along with other specified register values (0x00127300 for 0C, 0x36B48000 for 0D, etc.).

The RF75 offers TX power settings ranging from 7dBm down to -25dBm, configured by specific combinations of Bank1.Reg4<29:27> and Bank0.Reg6<2:1> values.

No, the RF75 RSSI threshold cannot be adjusted. It has fixed values of -84dBm for 250KHz, -80dBm for 1MHz, and -67dBm for 2MHz.

To connect RF75 (e.g., at 3.3V) to a 5V MCU IO logic level, a 2kohm resistor should be connected with each of the SCK, CE, CSN, and MOSI pins.

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