# Connector Pinout
Rear side of PCB
# Pin Descriptions
Each pin has a *Type ID*, which can be used to look up in the following tables what the pin is for, and what functions it can perform.
| Pin Number | Name | Type ID | Default function |
| ----------:|:-------- | ------- |:---------------------------------------------------- |
| 1 | **12V** | 12V | 12V supply from main relay output, see also pin #29 |
| 2 | **GND** | pgnd | Power GND |
| 3 | **Lowside 2** | ls | Idle solenoid |
| 4 | **ETB+** | etb | ETB+ |
| 5 | **12V** | 12V | 12V supply from Key (turn on/off power) |
| 6 | **GND** | pgnd | Power GND |
| 7 | **Lowside 1** | ls | VVT |
| 8 | **ETB-** | etb | ETB- |
| 9 | **Ignition 1** | ign | Ignition 1 |
| 10 | **Ignition 2** | ign | Ignition 2 |
| 11 | **Ignition 3** | ign | Ignition 3 |
| 12 | **Ignition 4** | ign | Ignition 4 |
| 13 | **GP out 6** | gp_high | Alternator (see JP2 jumper note) |
| 14 | **GP out 5** | gp_high | (see JP2 jumper note) |
| 15 | **USB D-** | usb | USB white wire |
| 16 | **USB D+** | usb | USB green wire |
| 17 | **GND** | sgnd | Signal GND |
| 18 | **AN Temp 1** | at | CLT sensor |
| 19 | **AN Volt 4** | av | **Starting from version 0.5.0 this pin can be used as 5V input for USB connection through main connector (No need to open case to access micro-USB connector)** |
| 20 | **AN Volt 5** | av | |
| 21 | **GND** | sgnd | Signal GND |
| 22 | **AN Temp 4** | at | |
| 23 | **AN Temp 2** | at | IAT sensor |
| 24 | **AN Temp 3** | at | |
| 25 | **Cam (hall)** | hall | |
| 26 | **AN Volt 2** | av | TPS sensor |
| 27 | **AN Volt 1** | av | MAP sensor |
| 28 | **AN Volt 10** | av | |
| 29 | **Main relay** | mr | Main relay control signal (low side) |
| 30 | **AN Volt 7** | av | |
| 31 | **AN Volt 3** | av | Throttle Pedal Position Sensor (PPS) |
| 32 | **AN Volt 6** | av | External wideband O2 sensor |
| 33 | **GP out 3** | gp_low (gp_pp) | (IDLE stepper coil 2+) |
| 34 | **GP out 2** | gp_low (gp_pp) | Fan relay (IDLE stepper coil 1-) |
| 35 | **GP out 1** | gp_low (gp_pp) | Fuel pump relay (IDLE stepper coil 1+) |
| 36 | **AN Volt 8** | av | |
| 37 | **Injector 1** | inj | Injector 1 |
| 38 | **Injector 2** | inj | Injector 2 |
| 39 | **5V Sensor 2** | 5v | MAP sensor supply |
| 40 | **AN Volt 9** | av | |
| 41 | **Injector 3** | inj | Injector 3 |
| 42 | **Injector 4** | inj | Injector 4 |
| 43 | **GP out 4** | gp_low (gp_pp) | (IDLE stepper coil 2+) |
| 44 | **5V Sensor 1** | 5v | TPS sensor supply |
| 45 | **VR+/Hall** | vr/hall | Crank VR+/hall |
| 46 | **VR-** | vr | Crank VR- (do not connect if hall) |
| 47 | **CAN low** | can | CAN bus |
| 48 | **CAN high** | can | CAN bus |
In some cases without "main relay output +12v" both pins #1 and #5 should be connected to the single source of +12v.
# Pin Types
These tables provide technical information about the different types of pin found on microrusEfi.
## 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.
## Input
| ID | Type | Notes & Limits | Possible functions |
|------|---------------------| ------------------------------------------------------------------------------------ | --- |
| at | Analog temperature | Analog temperature (thermistor) input. 2.7k/TBD 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 | TBD pull up to 5v 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
**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
| 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
| gp_pp | General purpose Push-Pull | General purpose push-pull (low and high side) output, 600mA | Bipolar IDLE stepper, relays, solenoids |
| 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
throttle body directly to these two pins.
## Communication
| ID | Type | Notes & Limits |
|----|-------------| ---- |
| usb | USB | USB tuning interface
| can | CAN bus | CAN communication
USB cable green wire: USB D+ DATA+
USB cable white wire: USB D- DATA-
USB cable black wire: ground
USB cable red wire: +5v (would not work via microRusEfi connector for versions < 0.5.0)
## Hall type Crank sensor
See TLE8888 datasheet figure 71
R9=DNP
R15=DNP
R17=2.7K pull-up to 5v
R12=10K
R13=0R
# Extra pins
microRusEFI exposes the following pins in addition to the primary 48 pin connector:
J4:
| N | Name | Possible functions (not all listed!) |
|----|-------------| ---- |
| 9 | GNS | GND
| 4 | VDD | 3.3V
| 1 | 5V | 5V
| 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)
Three GPIOs are available on J2 (SWD) connector. If you are not going to use debuger J2 connector can be used for other purposes.
| N | Name | Possible functions (not all listed!) |
|----|-------------| ---- |
| 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.
Please refer to PCB layout for exact positions of this testpoints (no silk refdefs on PCB).
| 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.