R9 MM-FC Manual

Introduction
The FrSky R9 MM-FC (OMNIBUS F4 Nano V7) uses the ICM20608 over SPI to produce stable flight performance.
Integrated with the R9 MM-FC receiver mounted onboard, and the ICM runs the 32k Gyro loop perfectly. Also
onboard is an AB7456 OSD chip for the Betaflight OSD.
An on-board R9 MM-FC receiver and 20mm x 20mm mounting holes make it perfect for a super clean micro
quadcopter build. It supports 3-6S LiPo direct input and has 6 hardware UARTs and an I2C port.
Overview
VBAT
FrSky RX port
GND
5V

Specifications

• Tantalum Capacitors added for noiseless gyro reading
• Solder pads added for SmartAudio and Camera Control (next to Video pads)
• FPC port for FrSky FC receivers like the R9 MM-FC/RXSR-FC receiver
• This board now has 6 UART ports
• PWM pads on corner
• Upgraded BEC, 3A output
Features
• STM32 F405 MCU, Runs Betaflight firmware(supported from v3.2)
• ICM Gyro Over SPI Bus
• 20 x 20 mm Mounting holes
• Supports Lipo direct plugin (3-6S)
•
Supports 5V 3A BEC output (Buck)
• STM32 controls OSD chip over SPI in DMA mode (Betaflight OSD)
• More UARTs
Manual for R9 MM-FC (OMNIBUS F4 Nano V7)
SCL
SDA
LED
Camera
GND
5V
Cam_Ctrl
Video Input
GND
5V
Video Output
Smart Audio
VTX