Work completed
- Project description updated
- System architecture diagram defined
- U10 (MP5014) and U11 (LTC2955) added and valued
- RC delay network (R_CT/C_CT) and MCU pull-up (R9) added
- RC slew‐inrush network (R10/C10) added
- VBAT routed to U10:SOURCE; U10:VOUT to U6:VIN, U7:VIN, L1/P1→SIM800L
- SW1→U11:IN; VBAT→U11:VIN; U11:OUT→U10:ENABLE; U1.GPIO2→U11:KILL
- R_CT→U11:TMR→C_CT→GND; R10→SYS_EN→C10→GND
- SYS_EN→U6:EN, U7:EN
- ERC/DRC run and no errors remain
Success criteria
- ✅ VSYS rail gated by U10 powers U6, U7, SIM800L via LC filter
- ✅ LTC2955 long-press function (3 s) via SW1+RC controls U10
- ✅ MCU override on KILL and SYS_EN linked to U6/U7
- ✅ Pull-ups and RC slew elements placed; ERC/DRC clean
Next step
Prepare the PCB layout: review footprints, configure stackup, and select board mounting solution.