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Ordinal PORT PIN
176-pin STM32F765IIK
Signal
176-pin STM32F765IIK
FMU USAGE
Functional Description
0 PA 0 ADC1_IN0 BAT1_V
Analog INPUT: Battery (aka Brick) voltage sense, typically resistive divider on Power Brick module with
low source impedance
1 PA 1 ADC1_IN1 BAT1_I
Analog INPUT: Battery (aka Brick) current sense, typically low side sense scaled by gain factor on Power
Brick module
2 PA 2 ADC1_IN2 BAT2_V
Analog INPUT: Battery (aka Brick) voltage sense, typically resistive divider on Power Brick module with
low source impedance
3 PA 3 ADC1_IN3 BAT2_I
Analog INPUT: Battery (aka Brick) current sense, typically low side sense scaled by gain factor on Power
Brick module
4 PA 4 ADC1_IN4 ADC1_SPARE_2
Analog INPUT: Can be used to sense any additonal analog voltage or current - but will be board
dependent. Leave NC if not used
5 PA 5 TIM2_CH1_IN FMU_CAP1
Digital INPUT: Typicaly used for PWM input or edge capture, route to SERVO Header - See protection
note
6 PA 6 SPI1_MISO SPI1_MISO_SENSOR1
Digital INPUT: SPI Bus 1 Master In Slave Out for Sensor bus 1 - Internal Sensors
7 PA 7 TIM14_CH1 HEATER
Digital OUTPUT: Active High, Open Circuit state should be OFF, PWM or GPIO, connected to N-Channel
FET to switch on and off resistor as heater, can be duty cycle modulated to set average power See Layout Recomendation
8 PA 8 CAN3_RX CAN3_RX
Digital INPUT: Connected to CAN Transceiver RXD signal - dronecode recommended TJA1051TK3/118
with Silent control (A HIGH level on pin S selects Silent mode TX is disabled, RX is active)
9 PA 9 USB_OTG_FS_VBUS VBUS
Digital INPUT: Provides the VBUS sensing feature for the Flight Managment Unit (FMU), voltage presence
used to enter bootloader when FMU is connected to USB, recommend NUF2042XV6 or equivalent
terminator w/ ESD protection
10 PA 10 TIM1_CH3 FMU_CH2
Digital I/O: Output: PWM, GPIO, Input: PWM Input or capture route to SERVO Header - See protection
note
11 PA 11 USB_OTG_FS_DM USB_DM
Digital I/O: USB D Minus, recommend NUF2042XV6 or equivalent terminator w/ ESD protection
12 PA 12 USB_OTG_FS_DP USB_DP
Digital I/O: USB D Plus, recommend NUF2042XV6 or equivalent terminator w/ ESD protection
13 PA 13 SWDIO JTAG-SWDIO
Digital I/O: Connected to Pin 4 of the Dronecode Debug connector (JST SM06B) for FMU. See https:
//wiki.dronecode.org/workgroup/connectors/start?s[]=connector
14 PA 14 SWCLK JTAG-SWCLK
Digital INPUT: Connected to Pin 5 of the Dronecode Debug connector (JST SM06B) for FMU. See https:
//wiki.dronecode.org/workgroup/connectors/start?s[]=connector
15 PA 15 CAN3_TX CAN3_TX
Digital OUTPUT: Connected to CAN Transceiver TXD signal - dronecode recommended TJA1051TK3/118
with Silent control (A HIGH level on pin S selects Silent mode TX is disabled, RX is active)
16 PB 0 ADC1_IN8 RSSI_IN
Analog INPUT: RSSI connected through 10K series resistor with TVS protection at connector after series
220R to connector pin (May Also be used as TBD TIM3_CH3 Capture Digital INPUT)
See circuit Recomendation
PX4IO conditional
17 PB 1 TIM3_CH4 nLED_RED
Used for status, may be a discrete LED. Does not require super a bright LED (Driven with OPEN DRAIN
ANODE can be V5 or V3.3)
Digital OUTPUT: Active Low, PWM capable pin to drive onboard Red LED (Single Red LED or R of RGB LED)
18 PB 2
available Digital GPIO
19 PB 3 TIM2_CH2_IN FMU_CAP2
Digital INPUT: Typicaly used for PWM input or edge capture, route to SERVO Header - See protection
note
20 PB 4 PB4 SPI1_DRDY1_ICM20689
Digital INPUT: Ready Interrupt from ICM20689 if sensor present, NC if sensor not present
21 PB 5 SPI6_MOSI SPI6_MOSI_EXTERNAL2
Digital OUTPUT: SPI Bus 6 Master Out Slave In for External bus 2 - External
22 PB 6 USART1_TX USART1_TX_GPS1
Digital OUTPUT: USART1 TX is used for GPS1
23 PB 7 USART1_RX USART1_RX_GPS1
Digital INPUT: USART1 RX is used for GPS1
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