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# Connector Pinout
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[Interactive Pinout ](https://rusefi.com/docs/pinouts/microrusefi/ )
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< span style = "color:red" > ** ## WARNING: for historical reasons microRusEFI pin numbers do not match Molex numbers on the plastic</ span >
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![connector ](Hardware/microRusEFI/Hardware_microRusEFI_connector.png )
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![microRusEFI photo ](Hardware/microRusEFI/Hardware_microRusEFI_connector.jpg )
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Rear side of PCB
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![microRusEFI image ](Hardware/microRusEFI/Hardware_microRusEFI_0_3_PCB_pinout.png )
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![x ](Hardware/microRusEFI/microRusEFI_connectors/MRE_reality.jpg )
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In some cases without "main relay output +12v" both pins #1 and #5 should be connected to the single source of +12v.
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Pin #1 feeds ETB H-bridge, battery voltage sense, gp5 & gp6 high-side +12v, TLE8888 H-bridges.
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# Pin Types
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These tables provide technical information about the different types of pin found on microRusEFI.
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## Power
| ID | Type | Notes & Limits |
|----|-------------| ---- |
| 12V | Power supply | 9-22V operating, 5A fuse recommended |
| pgnd | Power ground | Solidly ground directly to chassis or engine block. |
| sgnd | Signal ground | Sensor ground. ** *Do not ground to engine!***
| 5v | 5V sensor supply | 5V supply for external sensors. 200mA maximum per pin.
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## Stepper
| Pin | Name | Notes & Limits |
|------|---------------------| ------------------------------------------------------------------------------------ |
| #33 | GP4 | Coil #2 |
| #34 | GP2 | Coil #1 |
| #35 | GP1 | Coil #1 |
| #43 | GP4 | Coil #2 |
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## Input
| ID | Type | Notes & Limits | Possible functions |
|------|---------------------| ------------------------------------------------------------------------------------ | --- |
| at | Analog temperature | Analog temperature (thermistor) input. < mark > 2.7k/TBD< / mark > pullup resistor to 5v | Thermistor temperature sensor, fuel level sender (variable resistor type) |
| av | Analog voltage | Analog voltage input. 500k pull down to GND | Analog voltage sensor (MAP, TPS, acc pedal, oil pressure, etc)
| vr | Variable reluctor | VR crank input | VR sensors including crank, cam, vehicle speed
| hall | Hall cam/crank | < mark > TBD pull up to 5v< / mark > hall sensor for cam/crank | Hall sensors including crank, cam, vehicle speed
## Output
| ID | Type | Notes & Limits | Possible functions |
|----|-------------| ---- | --- |
| inj | Injector output | Low side, 2.2A maximum< br / > **Only saturated (high impedance) injectors are supported.** | Injector, general purpose low side |
| ign | Ignition output | 5V push-pull, 250mA maximum | Ignition coil, general purpose 5V push-pull
| ls | High power low side | General purpose low side output, 4.5A maximum | General purpose low side, injector
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| gp_high | General purpose high side | General purpose high side push output, 5V/12V (internally selectable based on JP2 jumper) 250mA maximum | General purpose 5V/12V high side, ignition coil
| gp_low | General purpose low side | General purpose low side pull output, 12V 500mA maximum | General purpose low side
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| gp_pp | General purpose Push-Pull | General purpose push-pull (low and high side) output, 600mA | Bipolar IDLE stepper, relays, solenoids |
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| mr | Main relay | Dedicated main relay output. Low side turned on with power, 800mA maximum. | Main relay
| etb | Electronic throttle | Dedicated electronic throttle outputs. Connect a brushed motor< br / > throttle body directly to these two pins.
## Communication
| ID | Type | Notes & Limits |
|----|-------------| ---- |
| usb | USB | USB tuning interface
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| can | CAN bus | CAN communication
USB cable green wire: USB D+ DATA+
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USB cable white wire: USB D- DATA-
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USB cable black wire: ground
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[HOWTO wire external USB ](https://youtu.be/4v2VnP-YdlQ )
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USB cable red wire: +5v (would not work via microRusEFI connector for versions < 0.5.0 )
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## Hall type Crank sensor
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See TLE8888 datasheet figure 71
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R9=DNP
R15=DNP
R17=2.7K pull-up to 5v
R12=10K
R13=0R
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![front hall ](Hardware/microRusEFI/Hardware_microRusEFI_0_1_assembled_front_hall_setup.jpg )
![front lower ](Hardware/microRusEFI/Hardware_microRusEFI_0_1_assembled_front_lower.jpg )
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# Extra pins
microRusEFI exposes the following pins in addition to the primary 48 pin connector:
J4:
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![x ](Hardware/microRusEFI/J4.png )
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| N | Name | Possible functions (not all listed!) |
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|----|-------------| ---- |
| 9 | GNS | GND
| 4 | VDD | 3.3V
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| 1 | 5V | 5V
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| 2 | 12V | 12V from Main Relay
| 3 | PB8 | I2C1_SCL or CAN1_RX
| 6 | PB9 | I2C1_SDA or CAN1_TX
| 8 | PC10 | SPI3_SCK or USART3_TX or UART4_TX
| 5 | PC11 | SPI3_MISO or USART3_RX or UART4_RX
| 10 | PC12 | SPI3_MOSI or USART3_CK or UART5_TX
| 7 | PA15 | SPI3_NSS (Chip Select)
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[J2 Interactive Pinout ](https://rusefi.com/docs/pinouts/microrusefi/main.html )
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Three GPIOs are available on J2 (SWD) connector. If you are not going to use debuger J2 connector can be used for other purposes.
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| N | Name | Possible functions (not all listed!) |
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|----|-------------| ---- |
| 7, 8 | GND | GND |
| 1, 2 | 5V | 5V |
| 3, 4 | VDD | 3.3V |
| 5 | SCK | SWD clock or PA14 gpio (no alternative functions) |
| 9 | SWDIO | SWD data or PA13 gpio (no alternative functions) |
| 6 | SWO | SWD/JTAG data out (?) or SPI1_SCK or SPI3_SCK |
| 10 | NRST | CPU reset input (active low) |
For HW version 0.5.0 and newer some additional GPIOs are available on testpoints around STM32.
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![x ](Hardware/microRusEFI/J8_9_10.png )
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[Testpoint Interactive Pinout ](https://rusefi.com/docs/pinouts/microrusefi/pads.html )
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| Tespoint | GPIO | Possible functions (not all listed!) |
|----|-------------| ---- |
| J6 | PE0 | GPIO |
| J8 | PB7 | USART1_RX or TIM4_CH2 |
| J9 | PC13 | GPIO only |
| J10 | PE6 | TIM9_CH2 |
| J11 | PE5 | TIM9_CH1 |
| J16 | PD0 | CAN1_RX |
Please refer to STM32F407 chip documentation for full list of alternative functions of GPIOs listed above.