Eval-V2¶

New Features¶

• More current
• fixed PCB traces
• Fix Wakeup
• Periodic wakeups to make measurements
• Diode ? Voltage-Drop issue
  • Ideal diode with Mosfet
• High voltage (24V) ?
  • Different connectors
• Global Timeserver; It already has batteries
• Real touch keys
• Over-Temperature power off (PCB/Box)
• Buzzer?
  • indicate peridoc on/off during day time
• 4 Sectionen: SZ, WZ, MEMS, ?
  • Stoeren ungepowerte Platinen CAN?

Components¶

old:

• Traffo: tmps05-105
• 80 %
• max 1000mA, 1300mA peak

new:

• All

• AMEL20-5S277HAVZ
• 85%
• 4A max

• MPM-20-5; 20W; 85%

Ideal Diode:

• VN7140ASTR; up to 0,280 ohm, 0,120 Ohm typical
• LTC4412; 2,9V; TME 2.60EUro; External P-MOSFET needed
• MAX40200; 1A only, no external MOSFET

LTC4412 is the only available

Calculations¶

• 240V/600mA eigentlich ausreichend; 144W
• AQH3213A
• STM32F030K6T6 should draw 20µA in stop
• 700mAh=700000µAh
• 700000µAh/20µA=3500h=1458d=ca 4 years

MCU¶

• Find
• STM32F072C8T6
  • 2V, ok, Entladeaschlussspannung
  • Nur LQFP48; 4.53Euro
  • 1,85 € Reichelt STM32F072CBT6 128KB Flash
• STM32H503CBT6, STM32H503KBU6
  • 3.20Euro
• Fuer VBAT wird beim STM32H503KBU6 auch FQFP48 benoetigt.

Issues¶

Wie Straenge schalten¶

• 4 x LTC4412 umstaendlich, E.g. status ruecklesen
• Jeweils 2 Mosfets notwendig um zu isolieren, klein + gross *