Design review V1 - Electronics
A first draft of the schematics and layout is available for review:
- In the repo, under mcattin_hw_dev branch.
- Schematics PDF version.
- Layout PDF version.
- PCB production files ZIP file.
Apart from a general review, here are some specific points to be checked:
| What | Who | Status |
|---|---|---|
| Symbols and footprints pinout | Tom checked the MCU | |
| Battery charger and fuel gauge connections (GND) | To do | |
| MCU peripherals connections | ||
| (pins can't be connected to any peripheral) | To do | |
| MCU debug port, reset | To do | |
| MCU clock sources | To do | |
| Is USB low-speed needed? (pull-up on DM line) | To do | |
| Do we need ferrites on USB power lines? | To do | |
| Is powering the LCD from a MCU pin ok? | To do | |
| Is the 150mA LDO enough? (pin compatible 250mA if needed) | To do | |
| Is anything missing? | To do |
Bootloader
To enter the bootloader, DBG_SWCLK (PF0) must be pulled high and the
EFM32 must be reset.
See application note
AN0042
=> We should find a way to run the bootloader from the main application (without having to open the case!).
Power profiling?
Foresee sensors, test points on the PCB?