Difference between revisions of "MicroBoSL"
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This verifies the status of the MCU and the USB-TTL converter. | This verifies the status of the MCU and the USB-TTL converter. | ||
| − | Next is to test the RTC. | + | Next is to test the RTC. A quick test with indicates that this too is working well. |
Revision as of 22:50, 19 January 2021
Here we will document the design of the microBoSL board , a miniaturized version of the BoSL board.
Key changes from the BoSL board to the microBoSL board:
- Upgrade SIM7000 to smaller SIM7090
- Remove much of the connectivity to achieve smaller profile
- Add NFC
- Make board much smaller. No more than 30 mm in width.
- Removed MS5803
To do this many components will have their parts changed to a smaller footprint version.
These substitutions include:
- Many passives -> mostly 0603
- ATmega328P-AU -> ATmega328P-MMH
- FT232RL -> FT232RQ
- 74HC126D -> 74HC126PW-Q100
- MCP7940NT-I/SN -> MCP7940NT-I/MNY
- MCP1700-3302E_SOT89 -> MCP1700-3302E_SOT23
20th January 2020
The micro BoSL is here:
MicroBoSL Front
A quick test reveals that programs are able to be uploaded to the device. This verifies the status of the MCU and the USB-TTL converter.
Next is to test the RTC. A quick test with indicates that this too is working well.
