ProgArm: ProgArm 0.4

Difference between revision 14 and revision 15

Summary: Moved to Progarm 0.3

Deleted:

< * <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.
< * <todo>USB circuit has to have a switchable 1k5 pullup ressistor on D+ line added in order to be properly detected by PC.

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).