rusefi_documentation/Prometheus-Assembly-MCU.md

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# Prometheus Assembly - MCU block
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## (a) - MCU
### Component List
![U5_2](Hardware/Prometheus/Prometheus_assembly_2a-comp.jpg)
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### PCB Top Side
![Orientation](Hardware/Prometheus/Prometheus_assembly_2a-pcb.jpg)
## (b) - ground/power connections
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### Component List
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![Components](Hardware/Prometheus/Prometheus_assembly_2b-comp.jpg)
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### PCB Top Side
![Placement](Hardware/Prometheus/Prometheus_assembly_2b-pcb1.jpg)
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## (c) - minimal circuitry
### Component List
![Components](Hardware/Prometheus/Prometheus_assembly_2c-comp.jpg)
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### PCB Top Side
![Placement](Hardware/Prometheus/Prometheus_assembly_2c-pcb1.jpg)
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### PCB Bottom Side
![Placement Bottom Side](Hardware/Prometheus/Prometheus_assembly_2c-pcb2.jpg)
**Warning for Rev0.1!** Be careful when soldering C42 and C43 - they should not be in contact!
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## (d) - pull-up resistors
### Component List
![Components](Hardware/Prometheus/Prometheus_assembly_2d-comp.jpg)
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### PCB Top Side
![Placement](Hardware/Prometheus/Prometheus_assembly_2d-pcb1.jpg)
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### PCB Bottom Side
![Placement Bottom Side](Hardware/Prometheus/Prometheus_assembly_2d-pcb2.jpg)
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## (e) - crystal
### Component List
![Component](Hardware/Prometheus/Prometheus_assembly_2e-comp.jpg)
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### PCB Top Side
![Placement](Hardware/Prometheus/Prometheus_assembly_2e-pcb.jpg)
The 1st pin is marked with a little dash:
![Placement Dash](Hardware/Prometheus/Prometheus_assembly_2e-pcb-dash.jpg)
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## (f) - LED and programmer connector
### Component List
![Components](Hardware/Prometheus/Prometheus_assembly_2f-comp.jpg)
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### PCB Top Side
![Placement](Hardware/Prometheus/Prometheus_assembly_2f-pcb.jpg)
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## Connecting the programmer
**Now check if MCU works using ST-Link/V2 programmer:**
Make sure that an external +12V power supply is always connected when using the board:
![Programmer](Hardware/Prometheus/Prometheus_assembly_programmer.jpg)
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### SWD Connector pinout
The programmer connector pinout (from left to right):
1 - the first pin is not used
2 - GND (ground)
3 - NRST (reset)
4 - SWCLK
5 - SWDIO
![Connector Pinout](Hardware/Prometheus/Prometheus_assembly_2f_swd_connector.jpg)