Difference between revision 13 and revision 14
Changed:
< * <todo>WARNING! Current leakage through STM pin protection diodes when powered off. This causes standby I2C voltage drop and incorrect current measurement by charger chip. Issues need to be solved as current ProgArm 3 is unsafe to operate!
to
> * <todo>WARNING! Current leakage through STM pin protection diodes when powered off. This causes standby I2C voltage drop and incorrect current measurement by charger chip. Issues need to be solved as current ProgArm 3 is unsafe to operate! Temporary solution: to cut the trace that connects R-ilim to STM32 pin.
This is an upcoming version.
The work has
not started yet! Please see
Current Version.
Files
No files yet.
Undecided / Todo / Done
Current stage:
planning -> schematic -> components -> PCB -> waiting for PCBs -> testing
Ideas
- Use stm32L to improve Power Consumption.
- BMX055 instead of MPU9250.
- Redefine concept.
- Use resistor arrays.
- Use dual mosfets (6-pin SOTs).
- Redesign power system.
- Test points for I²C and SPI.
- 4.7kΩ pull-up resistors instead of 4.7kΩ.
- Consider using ARM MCU with onboard BLE frontend (i.e. freescale).
- WARNING! Current leakage through STM pin protection diodes when powered off. This causes standby I2C voltage drop and incorrect current measurement by charger chip. Issues need to be solved as current ProgArm 3 is unsafe to operate! Temporary solution: to cut the trace that connects R-ilim to STM32 pin.
- USB circuit has to have a switchable 1k5 pullup ressistor on D+ line added in order to be properly detected by PC.