Update AON5820 datasheet and correct C3 capacitor function description

- Downloaded correct AON5820 datasheet from AOS semiconductor
- Fixed C3 function description: Critical for QON-reset recovery
- C3 bridges VSYS interruption (~400ms) during charger system reset
- Ensures DC/DC re-enables when VSYS returns to prevent MCU power loss
- Technical accuracy improvement for power management documentation

Hardware/PowerProfiler/PowerProfiler.kicad_sch

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+NAMED_UNIT(*)
+SI_UNIT($,.METRE.)
+);
+#526=PRODUCT_DEFINITION_SHAPE('','',#527);
+#527=PRODUCT_DEFINITION('','',#529,#528);
+#528=PRODUCT_DEFINITION_CONTEXT('',#535,'design');
+#529=PRODUCT_DEFINITION_FORMATION_WITH_SPECIFIED_SOURCE('','',#531,
+ .NOT_KNOWN.);
+#530=PRODUCT_RELATED_PRODUCT_CATEGORY('','',(#531));
+#531=PRODUCT('FTC404030','FTC404030','FTC404030',(#533));
+#532=PRODUCT_CATEGORY('','');
+#533=PRODUCT_CONTEXT('',#535,'mechanical');
+#534=APPLICATION_PROTOCOL_DEFINITION('international standard',
+'ap242_managed_model_based_3d_engineering',2011,#535);
+#535=APPLICATION_CONTEXT('managed model based 3d engineering');
+ENDSEC;
+END-ISO-10303-21;

Hardware/PowerProfiler/lib/PowerProfiler.kicad_sym

@@ -2,6 +2,517 @@
 	(version 20241209)
 	(generator "kicad_symbol_editor")
 	(generator_version "9.0")
+	(symbol "AON5820"
+		(exclude_from_sim no)
+		(in_bom yes)
+		(on_board yes)
+		(property "Reference" "Q"
+			(at 0 6.35 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(property "Value" "AON5820"
+			(at 0 0 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(property "Footprint" "PowerProfiler:DFN2x5_6L_EP1_P"
+			(at 0 0 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(hide yes)
+			)
+		)
+		(property "Datasheet" ""
+			(at 0 0 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(hide yes)
+			)
+		)
+		(property "Description" ""
+			(at 0 0 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(hide yes)
+			)
+		)
+		(symbol "AON5820_0_1"
+			(polyline
+				(pts
+					(xy -7.62 0) (xy -3.048 0) (xy -3.048 1.778)
+				)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(polyline
+				(pts
+					(xy -4.826 1.778) (xy -4.826 -0.762) (xy -1.27 -0.762) (xy -1.27 1.778)
+				)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(circle
+				(center -4.826 0)
+				(radius 0.254)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type outline)
+				)
+			)
+			(polyline
+				(pts
+					(xy -4.318 1.778) (xy -5.334 1.778)
+				)
+				(stroke
+					(width 0.254)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(polyline
+				(pts
+					(xy -3.048 1.524) (xy -2.667 0.508) (xy -3.429 0.508) (xy -3.048 1.524)
+				)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type outline)
+				)
+			)
+			(polyline
+				(pts
+					(xy -2.667 -0.381) (xy -2.667 -1.143)
+				)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(polyline
+				(pts
+					(xy -2.667 -0.762) (xy -3.302 -0.381) (xy -3.302 -1.143) (xy -2.667 -0.762)
+				)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(polyline
+				(pts
+					(xy -2.54 1.778) (xy -3.556 1.778)
+				)
+				(stroke
+					(width 0.254)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(circle
+				(center -1.27 0)
+				(radius 0.254)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type outline)
+				)
+			)
+			(polyline
+				(pts
+					(xy -1.143 2.286) (xy -4.953 2.286)
+				)
+				(stroke
+					(width 0.254)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(polyline
+				(pts
+					(xy -0.762 1.778) (xy -1.778 1.778)
+				)
+				(stroke
+					(width 0.254)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(circle
+				(center 0 0)
+				(radius 0.254)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type outline)
+				)
+			)
+			(polyline
+				(pts
+					(xy 0.762 1.778) (xy 1.778 1.778)
+				)
+				(stroke
+					(width 0.254)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(polyline
+				(pts
+					(xy 1.143 2.286) (xy 4.953 2.286)
+				)
+				(stroke
+					(width 0.254)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(polyline
+				(pts
+					(xy 1.27 0) (xy -1.27 0)
+				)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(circle
+				(center 1.27 0)
+				(radius 0.254)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type outline)
+				)
+			)
+			(polyline
+				(pts
+					(xy 2.54 1.778) (xy 3.556 1.778)
+				)
+				(stroke
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+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(polyline
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+				)
+				(stroke
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+					(type default)
+				)
+				(fill
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+				)
+			)
+			(polyline
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+				)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(polyline
+				(pts
+					(xy 3.048 1.524) (xy 2.667 0.508) (xy 3.429 0.508) (xy 3.048 1.524)
+				)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type outline)
+				)
+			)
+			(polyline
+				(pts
+					(xy 4.318 1.778) (xy 5.334 1.778)
+				)
+				(stroke
+					(width 0.254)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(polyline
+				(pts
+					(xy 4.826 1.778) (xy 4.826 -0.762) (xy 1.27 -0.762) (xy 1.27 1.778)
+				)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(circle
+				(center 4.826 0)
+				(radius 0.254)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type outline)
+				)
+			)
+			(polyline
+				(pts
+					(xy 7.62 0) (xy 3.048 0) (xy 3.048 1.778)
+				)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+		)
+		(symbol "AON5820_1_1"
+			(polyline
+				(pts
+					(xy -7.62 3.81) (xy -4.826 3.81) (xy -4.826 2.286)
+				)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(rectangle
+				(start -6.985 5.08)
+				(end 7.62 -2.54)
+				(stroke
+					(width 0)
+					(type solid)
+				)
+				(fill
+					(type background)
+				)
+			)
+			(polyline
+				(pts
+					(xy 0 -2.54) (xy 0 0)
+				)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(polyline
+				(pts
+					(xy 7.62 3.81) (xy 4.826 3.81) (xy 4.826 2.286)
+				)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(pin input line
+				(at -10.16 3.81 0)
+				(length 2.54)
+				(name ""
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "3"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin passive line
+				(at -10.16 0 0)
+				(length 2.54)
+				(name ""
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "1"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin passive line
+				(at -10.16 0 0)
+				(length 2.54)
+				(hide yes)
+				(name ""
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "2"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin passive line
+				(at 0 -5.08 90)
+				(length 2.54)
+				(name ""
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "7"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin input line
+				(at 10.16 3.81 180)
+				(length 2.54)
+				(name ""
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "4"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin passive line
+				(at 10.16 0 180)
+				(length 2.54)
+				(name ""
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "5"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin passive line
+				(at 10.16 0 180)
+				(length 2.54)
+				(hide yes)
+				(name ""
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "6"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+		)
+		(embedded_fonts no)
+	)
 	(symbol "BQ25672"
 		(exclude_from_sim no)
 		(in_bom yes)

Hardware/PowerProfiler/lib/PowerProfiler.pretty/DFN2x5_6L_EP1_P.kicad_mod

@@ -0,0 +1,382 @@
+(footprint "DFN2x5_6L_EP1_P"
+	(version 20241229)
+	(generator "pcbnew")
+	(generator_version "9.0")
+	(layer "F.Cu")
+	(property "Reference" "REF**"
+		(at 0 -2.1 0)
+		(unlocked yes)
+		(layer "F.SilkS")
+		(uuid "44a0d549-1101-4d5b-ba2a-1266b607f3e3")
+		(effects
+			(font
+				(size 1 1)
+				(thickness 0.15)
+			)
+		)
+	)
+	(property "Value" "DFN2x5_6L_EP1_P"
+		(at 0 1 0)
+		(unlocked yes)
+		(layer "F.Fab")
+		(uuid "33b8d5c8-362e-4633-ba5d-21d5cca6502a")
+		(effects
+			(font
+				(size 1 1)
+				(thickness 0.15)
+			)
+		)
+	)
+	(property "Datasheet" ""
+		(at 0 0 0)
+		(unlocked yes)
+		(layer "F.Fab")
+		(hide yes)
+		(uuid "822b0afe-f77f-43a2-b897-5557e49ebc2b")
+		(effects
+			(font
+				(size 1 1)
+				(thickness 0.15)
+			)
+		)
+	)
+	(property "Description" ""
+		(at 0 0 0)
+		(unlocked yes)
+		(layer "F.Fab")
+		(hide yes)
+		(uuid "979c2977-32fb-47d1-8e02-ee9d1ad7f631")
+		(effects
+			(font
+				(size 1 1)
+				(thickness 0.15)
+			)
+		)
+	)
+	(attr smd)
+	(fp_rect
+		(start -1.385 -0.9)
+		(end -0.9 0.9)
+		(stroke
+			(width 0)
+			(type solid)
+		)
+		(fill yes)
+		(layer "F.Mask")
+		(uuid "3f372a89-6b8b-4290-8e6e-37757aa97f79")
+	)
+	(fp_rect
+		(start -0.9 -0.9)
+		(end 0.9 -0.7)
+		(stroke
+			(width 0)
+			(type solid)
+		)
+		(fill yes)
+		(layer "F.Mask")
+		(uuid "437c4fe3-3b65-4498-8cbb-3092b20dea95")
+	)
+	(fp_rect
+		(start -0.9 -0.3)
+		(end 0.9 0.3)
+		(stroke
+			(width 0)
+			(type solid)
+		)
+		(fill yes)
+		(layer "F.Mask")
+		(uuid "17c54e19-eefb-4cb4-8a30-22769fa63e22")
+	)
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+		(start -0.9 0.7)
+		(end 0.9 0.9)
+		(stroke
+			(width 0)
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+		)
+		(fill yes)
+		(layer "F.Mask")
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+	)
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+		(start -0.5 -0.9)
+		(end 0.5 0.9)
+		(stroke
+			(width 0)
+			(type solid)
+		)
+		(fill yes)
+		(layer "F.Mask")
+		(uuid "cf3122f2-1410-4ffa-bd3a-95e240a42250")
+	)
+	(fp_rect
+		(start 1.385 -0.9)
+		(end 0.9 0.9)
+		(stroke
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+			(type solid)
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+		(layer "F.Mask")
+		(uuid "ebc6d5a1-7eef-4f5f-8baa-09a348a60ff0")
+	)
+	(fp_circle
+		(center -0.7 -0.5)
+		(end -0.45 -0.5)
+		(stroke
+			(width 0.1)
+			(type solid)
+		)
+		(fill no)
+		(layer "F.Mask")
+		(uuid "52574f56-bb94-4404-98ae-8acf527bf158")
+	)
+	(fp_circle
+		(center -0.7 0.5)
+		(end -0.45 0.5)
+		(stroke
+			(width 0.1)
+			(type solid)
+		)
+		(fill no)
+		(layer "F.Mask")
+		(uuid "ff337c18-50c8-4182-803e-34fcf5daaf88")
+	)
+	(fp_circle
+		(center 0.7 -0.5)
+		(end 0.95 -0.5)
+		(stroke
+			(width 0.1)
+			(type solid)
+		)
+		(fill no)
+		(layer "F.Mask")
+		(uuid "fd631b03-8a39-494f-92a6-7640a9c66c59")
+	)
+	(fp_circle
+		(center 0.7 0.5)
+		(end 0.95 0.5)
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+		(start -2.3 1.05)
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+	)
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+	)
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+		(layer "F.Paste")
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+	)
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+		(uuid "d5e02262-62b7-412b-8b32-c21825bb6caa")
+	)
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+		(start 1.385 -0.9)
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+		(stroke
+			(width 0)
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doc/Hardware_PowerSupply.de.md

@@ -59,7 +59,7 @@ Das System generiert vier verschiedene Versorgungsspannungen:
 |------------|----------|---------|-----------|
 | **VDD** | Hauptversorgung (MCU, Sensoren, Flash) | [Buck-Boost-Wandler](#buck-boost-wandler-33-v) | ✓ |
 | **VDDSD** | MicroSD-Kartenslot | [Buck-Boost-Wandler](#buck-boost-wandler-33-v) | ✓ |
-| **VRTC** | RTC und MCU-VBAT | [VBackup-Multiplexer](#vbackup-multiplexer) | – |
+| **VRTC** | RTC und MCU-VBAT | [VRTC-Multiplexer](#vrtc-multiplexer) | – |
 | **VBACKUP** | RTC-Backup | [CR1220-Zelle](#backup-batterie-cr1220) | – |
 
 ### Systemarchitektur
@@ -79,11 +79,10 @@ graph TD
     end
     
     subgraph "Energiemanagement"
-        PMUX_EXT[ Power-Multiplexer<br/>Externe Quellen ]
+        CHARGER[ Ladeschaltung<br/>BQ25672 ]
-        CHARGER[ Ladeschaltung<br/>bq24296M + bq24239 ]
         DCDC[ Buck-Boost-Wandler<br/>TPS63020 ]
         LDO[ LDO-Regler<br/>XC6206P332MR-G ]
-        PMUX_BACKUP[ VBackup-Multiplexer<br/>TPS2116 ]
+        PMUX_BACKUP[ VRTC-Multiplexer<br/>Diskrete Lösung ]
         SDSWITCH[ SD-Schalter<br/>P-MOSFET ]
     end
     
@@ -94,9 +93,8 @@ graph TD
         VBACKUP[ VBACKUP<br/>3V Backup ]
     end
     
-    USBC --> PMUX_EXT
+    USBC --> CHARGER
-    DEBUG --> PMUX_EXT
+    DEBUG --> CHARGER
-    PMUX_EXT --> CHARGER
     CHARGER <--> GAUGE
     GAUGE <--> PROTECTION
     PROTECTION <--> LIPO
@@ -164,8 +162,8 @@ Die Schutzschaltung überwacht und schützt vor:
 | Innenwiderstand | R_SS(on) | typ. 13,5 mΩ |
 | Thermischer Widerstand | θ_JC | 100 K/W |
 
-**Thermische Auslegung:**
+##### Thermische Auslegung:
-Bei maximaler Strombelastung (3 A) beträgt die Verlustleistung:
+Bei einem Dauerstrom von 2 A über den Schutz-MOSFET ergibt sich:
 $$P_{loss} = R_{SS(on)} \cdot I^2 = 20\text{ mΩ} \cdot (3\text{ A})^2 = 180\text{ mW}$$
 
 Dies führt zu einer Temperaturerhöhung von:
@@ -181,7 +179,7 @@ Die Fuel Gauge überwacht kontinuierlich:
 - Verbleibende Kapazität
 - Gesundheitszustand (State of Health, SOH)
 
-**Temperaturerfassung:**
+##### Temperaturerfassung:
 - **Betriebsmodus:** Temperaturwerte vom Lader-IC über I²C
 - **Ruhemodus:** Interner Temperatursensor der Fuel Gauge
 - **Übergangsstrategie:** Gesteuerte Umschaltung durch RTC-Wake-up
@@ -255,7 +253,7 @@ Die kritische Reserve ist die verfügbare Energie zwischen 3,0 V (Deep-Power-Dow
 |----------|----------------|-----------|
 | XB4908A (Akkuschutz) | 6 μA | Datenblattangabe |
 | bq27441-G1 (Fuel Gauge) | 1 μA | Geschätzt (typ. 0,6 μA) |
-| bq24296M (Lader) | 1 μA | Ship-Modus |
+| BQ25672 (Lader) | 1 μA | Ship-Modus |
 | **Gesamtverbrauch** | **8 μA** | |
 
 **Standzeit-Berechnung:**
@@ -265,111 +263,77 @@ Diese Standzeit von über 7 Monaten gewährleistet ausreichend Schutz vor Tiefen
 
 ### Spannungswandlung
 
-#### Power-Multiplexer (Externe Quellen)
-**Implementation:** Diskrete Lösung mit P-Kanal-MOSFETs  
-**Funktion:** Intelligente Umschaltung zwischen USB-C und Debug-Anschluss
-
-![VPower-Multiplexer Schaltung](img/power_power_mux.svg)
-
-**Funktionsprinzip:**
-
-**Debug-Priorität (Standby-Zustand):**
-Die Versorgung vom Debug-Anschluss wird durch den Pull-Down-Widerstand `R1` am Gate von `Q1` durchgeschaltet, sobald eine Spannung am Debug-Anschluss anliegt. Gleichzeitig wird `Q2` durch `R3` sperrend gehalten, da sein Gate über `R3` auf 5 V gezogen wird.
-
-**USB-Priorität (Aktiv-Zustand):**
-Beim Anschluss einer USB-Versorgung wird `Q1` sofort sperrend, da das Gate von `Q1` durch `R2` auf die USB-Spannung gezogen wird. Nach einer definierten Verzögerungszeit schaltet der `bq24239` den `n_CHG_AL`-Open-Drain-Ausgang auf GND und zieht damit das Gate von `Q2` über `R4` auf Masse. `Q2` wird leitend und die Laderversorgung erfolgt vom USB-Anschluss.
-
-**Umschaltverhalten:**
-Während der Umschaltung zwischen den Quellen ist das System kurzzeitig stromlos (bei nicht angeschlossenem Akku). Dies ist akzeptabel, da es sich um einen aussergewöhnlichen Betriebszustand handelt. Die Schaltung gewährleistet:
-- Betrieb ausschliesslich vom Debug-Anschluss (ohne Akku/USB)
-- Verhinderung von Kurzschlüssen zwischen den Versorgungsquellen
-- USB-Priorisierung im Normalbetrieb (Debug-Anschluss nicht gesteckt)
-
-
 #### Ladeschaltung
-**Hauptbaustein:** bq24296M (Texas Instruments)  
+**Hauptbaustein:** BQ25672 (Texas Instruments)  
-**Zusatzbaustein:** bq24239 für erweiterte Ladegeräteerkennung
+**Typ:** Hochintegrierter Buck-Boost-Lader mit integriertem Power-Multiplexer
 
-Die Ladeschaltung wurde von der ursprünglich geplanten bq25672 auf die bq24296M umgestellt, um Layoutkomplexität zu reduzieren bei gleichzeitiger Beibehaltung aller wichtigen Funktionen.
+Der BQ25672 wurde als Hauptladeschaltung gewählt und bietet alle erforderlichen Funktionen in einem einzigen IC.
 
-**Kernfunktionen der bq24296M:**
+**Kernfunktionen des BQ25672:**
-- Einstellbarer Ladestrom bis 3 A (10-mA-Schritte über I²C)
+- Integrierter bidirektionaler Power-Multiplexer für externe Quellen
-- Einstellbare Eingangsstrombegrenzung
+- Einstellbarer Ladestrom bis 4,5 A (über I²C)
-- Hohe Effizienz durch integrierte Synchronous-Switching-Architektur
+- Einstellbare Eingangsstrombegrenzung bis 3 A
-- NVDC-Funktion (Narrow Voltage DC)
+- Buck-Boost-Architektur für optimale Effizienz
+- Automatische USB-Ladegeräteerkennung (USB BC1.2, USB-C, HVDCP)
 - Ship-Modus für minimalen Stromverbrauch
-- Integrierte Power-MOSFETs
+- Integrierte Power-MOSFETs und Schutzfunktionen
 
-**Erweiterte Ladegeräteerkennung:**
+**Systemintegration:**
-Da die bq24296M keine direkte USB-Ladegeräteerkennung bietet, wird zusätzlich der bq24239 eingesetzt:
-
-```mermaid
-flowchart TD
-    START[Externe Versorgung erkannt] --> CC{CC-Leitungen messen}
-    CC -->|> 1,31 V| C[USB-C: 3 A verfügbar]
-    CC -->|0,71 V - 1,16 V| D[USB-C: 1,5 A verfügbar]
-    CC -->|< 0,61 V| BCD{bq24239 auslesen}
-    
-    BCD -->|SDP erkannt| ENUM[USB-Enumerierung]
-    BCD -->|DCP/CDP erkannt| SET[Strombegrenzung<br/>gemäss bq24239]
-    
-    ENUM --> LIMIT[Strombegrenzung<br/>gemäss Enumerierung]
-    
-    C --> CONFIG[Ladestrom konfigurieren]
-    D --> CONFIG
-    SET --> CONFIG
-    LIMIT --> CONFIG
-```
-
-**Systemverbindung:**
 ```mermaid
 graph LR
-    USBC[USB-C-Anschluss] --> CHARGER[bq24296M]
+    USBC[USB-C-Anschluss] --> MUX[Integrierter Power-MUX]
-    USBC -- D+/D- --> DETECTOR[bq24239]
+    DEBUG[Debug-Anschluss] --> MUX
+    MUX --> CHARGER[BQ25672 Core]
     USBC -- CC1/CC2 --> MCU[Mikrocontroller]
-    
-    DETECTOR -- D+/D- --> MCU
-    DETECTOR -- Erkennungssignale --> MCU
     MCU -- I²C --> CHARGER
-    
     CHARGER --> SYSTEM[Systemversorgung]
 ```
 
+**Vorteile der integrierten Lösung:**
+- Reduzierte Bauteilanzahl durch integrierten Power-Multiplexer
+- Optimierte Effizienz durch abgestimmte Regelkreise
+- Vereinfachtes Layout ohne externe MOSFETs für Quellenumschaltung
+- Automatische Ladegeräteerkennung ohne zusätzliche ICs
+
 #### Buck-Boost-Wandler (3,3 V)
 **Baustein:** TPS63020 (Texas Instruments)  
 **Funktion:** Hauptspannungsversorgung für MCU, Sensoren und Flash-Speicher
 
 Der TPS63020 wurde aufgrund der variablen Li-Ion-Akkuspannung (3,0 V - 4,2 V) als Buck-Boost-Wandler ausgewählt.
 
-**Technische Vorteile:**
+##### Technische Vorteile:
 - Sehr hohe Effizienz über den gesamten Eingangsspannungsbereich
 - Integrierte Power-MOSFETs (kein externes Switching erforderlich)
 - Hohe Schaltfrequenz → kompakte Induktivitäten möglich
 - Ultra-low Shutdown-Strom bei Deaktivierung
 
-**Wake-up-Logik:**
+##### DC/DC-Enable-Logik (Soft-Latch-System)
-Der Wandler wird über ein Wired-OR-Gatter aus mehreren Quellen aktiviert:
+![DC/DC Enable Logik](img/power_dcdc_enable.svg)
 
-```mermaid
+###### Übersicht
-graph TD
+Die Schaltung realisiert eine intelligente "Soft-Latch"-Funktion zur Ansteuerung des Haupt-DC/DC-Wandlers. Sie ermöglicht das Ein- und Ausschalten durch verschiedene Signalquellen sowie einen dedizierten Software-Befehl bei minimalstem Ruhestrom.
-    BUTTON[Einschalttaster] --> DIODE1[Diode]
+
-    RTC[RTC-Wake-up] --> DIODE2[Diode]
+###### Funktionsbeschreibung
-    CHARGER[Lader-Wake-up] --> DIODE3[Diode]
+Die zentrale Steuerleitung **DC/DC Enable** wird durch Pull-Down-Widerstand R6 (1,8MΩ) im Ruhezustand auf LOW gehalten. Ein HIGH-Pegel aktiviert den DC/DC-Wandler.
-    
+
-    DIODE1 --> OR[Wired-OR]
+**Einschaltvorgang:**
-    DIODE2 --> OR
+Mehrere diodenentkoppelte Signalquellen können das System aktivieren:
-    DIODE3 --> OR
+- **Active-Low-Quellen:** Button, RTC, Fuel Gauge (über D1-D3 direkt zu Q2-Gate)
-    
+- **Active-High-Quellen:** VBUS USB, VDEBUG (über D4/D5 → Q1 → Q2-Gate-Inverter)
-    OR --> NMOS[N-MOSFET<br/>Inverter]
+
-    
+**Selbsthaltung (Latching):**
-    MCU[Mikrocontroller] --> LATCH[Self-Latching]
+Sobald 3V3 DC/DC stabil ist, wird diese über R5 und D6 auf die Enable-Leitung zurückgeführt. Die Diode D6 verhindert Rückfluss von VRTC zur 3,3V-Schiene.
-    
+
-    NMOS --> DIODE4[Diode]
+**Ausschaltvorgang:**
-    LATCH --> DIODE5[Diode]
+Ein HIGH-Signal am GPIO OFF schaltet Q3 durch, der die Enable-Leitung aktiv auf GND zieht und die Selbsthaltung überstimmt.
-    
+
-    DIODE4 --> ENABLE[TPS63020<br/>Enable-Eingang]
+###### Schlüsselkomponenten
-    DIODE5 --> ENABLE
+- **Multi-Input-OR-Gatter:** Dioden D1-D5 + Transistoren Q1/Q2
-```
+- **Ausschalt-Schalter:** Q3 für zuverlässige Enable-Beendigung
+- **Stützkondensator C3:** Überbrückt kritische Versorgungsunterbrechungen während QON-Taster-Reset. Wenn der Lader durch langes Drücken des QON-Tasters einen System-Reset durchführt, fällt VSYS für ca. 400ms aus und damit auch die DC/DC-Ausgangsspannung. C3 hält das ENABLE-Signal während dieser kritischen Phase stabil, sodass der DC/DC-Wandler sofort wieder einschaltet, sobald VSYS zurückkehrt. Ohne C3 würde der Mikrocontroller keine Speisung erhalten und das System nicht mehr starten.
+- **Entprell-Kondensator C2:** RC-Tiefpassfilter für sauberes Taster-Signal
+- **Shutdown-Filter C1/R1/R2:** Schutz vor versehentlichem Ausschalten durch Störimpulse
+- **Schutzwiderstand R3:** Strombegrenzung bei gleichzeitigen Ein-/Ausschaltbefehlen
 
 #### SD-Karten-Schalter
 **Implementation:** P-Kanal-MOSFET (Load Switch)  
@@ -383,19 +347,19 @@ SD-Karten können auch im Idle-Zustand signifikanten Stromverbrauch aufweisen. D
 **Baustein:** XC6206P332MR-G (Torex)  
 **Funktion:** RTC- und VBAT-Versorgung bei deaktiviertem DC/DC-Wandler
 
-**Schlüsselparameter:**
+##### Schlüsselparameter:
 - Eigenverbrauch: 1 μA (typisch)
 - Dropout-Spannung: 160 mV @ 100 mA
 - Ausgangsspannung: 3,3 V ±2%
 
 **Dropout-Verhalten:**
-Bei Akkuspannungen unter 3,3 V arbeitet der LDO im Dropout-Bereich, wobei die Ausgangsspannung der Eingangsspannung minus Dropout-Spannung folgt. Dies kann zu I²C-Pegelkonflikten führen, weshalb der VBackup-Multiplexer bei aktivem DC/DC-Wandler auf VDD umschaltet.
+Bei Akkuspannungen unter 3,3 V arbeitet der LDO im Dropout-Bereich, wobei die Ausgangsspannung der Eingangsspannung minus Dropout-Spannung folgt. Dies kann zu I²C-Pegelkonflikten führen, weshalb der VRTC-Multiplexer bei aktivem DC/DC-Wandler auf VDD umschaltet.
 
-#### VBackup-Multiplexer
+#### VRTC-Multiplexer
 **Implementation:** Diskrete Lösung mit Schottky-Dioden und P-Kanal-MOSFET  
 **Funktion:** Intelligente Umschaltung zwischen DC/DC-Wandler und LDO für VRTC
 
-![VBackup-Multiplexer Schaltung](img/power_backup_mux.svg)
+![VRTC-Multiplexer Schaltung](img/power_backup_mux.svg)
 
 **Funktionsprinzip:**
 
@@ -420,6 +384,67 @@ Der Stromfluss vom LDO über `D1` wird unterbunden, da die Ausgangsspannung des
 
 ## Bauteilauslegung
 
+### Ladeelektronik
+
+Basierend auf den Anforderungen des Designs (max. Ladestrom 4,5 A, max. Eingangsstrom 3 A) und der System-Topologie (BQ25672, TPS63020) wurden die folgenden Hauptkomponenten für die Leistungselektronik ausgewählt und bewertet.
+
+#### Induktivitäten
+
+Es werden zwei unterschiedliche, für ihren jeweiligen Zweck optimierte Induktivitäten verwendet.
+
+**Lader (BQ25672):**
+- **Betriebspunkt:** f_SW = 750 kHz (Modus für hohe Effizienz)
+- **Benötigte Induktivität:** L = 2,2 μH
+- **Gewähltes Bauteil:** FTC404030S2R2MGCA (Cjiang)
+
+**Begründung:**
+Die Auswahl erfolgte aufgrund der hohen Robustheit des Bauteils. Die Nennströme der Induktivität bieten eine grosse Sicherheitsmarge gegenüber den Anforderungen der Applikation:
+- **Thermischer Nennstrom (I_rms):** 8,5 A (deutlich über dem max. Ladestrom von 4,5 A, was eine geringe Eigenerwärmung sicherstellt)
+- **Sättigungsstrom (I_sat):** 9,5 A (deutlich über dem zu erwartenden Spitzenstrom von ca. 5,3 A, was eine hohe Stabilität des Wandlers garantiert)
+
+**Systemwandler 3,3 V (TPS63020):**
+- **Betriebspunkt:** f_SW ≈ 2,4 MHz
+- **Benötigte Induktivität:** L ≈ 1,0 μH
+- **Gewähltes Bauteil:** FTC252010S1R0MBCA (Cjiang)
+
+**Begründung:**
+Die Auswahl erfolgte im Hinblick auf optimale elektrische Performance und kompakte Baugrösse für den Low-Power-Wandler:
+- **Induktivität:** Der Wert von 1,0 μH ist ideal für das schnelle Einschwingverhalten (Transient Response) des hochfrequenten TPS63020-Reglers
+- **Baugrösse:** Mit 2,5 × 2,0 mm ist die Spule angemessen klein für diesen Schaltungsteil
+- **Strombelastbarkeit:** Die Nennströme (I_rms = 4,1 A, I_sat = 4,8 A) sind für die maximale Last von 300 mA massiv überdimensioniert und stellen kein Risiko dar
+
+#### Eingangs-MOSFETs
+
+Für den bidirektionalen Eingangs-Schalter wird ein Dual-N-Kanal-MOSFET in Back-to-Back-Konfiguration (Common Drain) eingesetzt.
+
+**Gewähltes Bauteil:** AON5820 (Alpha & Omega Semiconductor)  
+**Betriebsbedingungen (Worst-Case):** Eingangsstrom I_IN(max) = 3 A, Gate-Ansteuerung V_GS ≥ 6 V
+
+**Berechnung der Verlustleistung und Erwärmung:**
+
+Die Berechnung basiert auf dem maximalen "heissen" Widerstand des Bauteils, um eine sichere Auslegung zu gewährleisten.
+
+*Bestimmung des R_DS(on):*
+- Maximaler Widerstand bei 25°C aus Datenblatt: R_DS(on)@25°C,4.5V = 9,5 mΩ
+- Temperaturkoeffizient für 125°C (aus Fig. 4): k_T ≈ 1,6
+- "Heisser" Widerstand pro FET: R_DS(on),hot = R_DS(on)@25°C × k_T = 9,5 mΩ × 1,6 = 15,2 mΩ
+
+*Gesamtwiderstand der Back-to-Back-Schaltung:*
+$$R_{total,hot} = 2 \times R_{DS(on),hot} = 2 \times 15,2\text{ mΩ} = 30,4\text{ mΩ}$$
+
+*Spannungsabfall bei 3 A:*
+$$V_{Abfall} = I_{IN} \times R_{total,hot} = 3\text{ A} \times 0,0304\text{ Ω} ≈ 91\text{ mV}$$
+
+*Verlustleistung bei 3 A:*
+$$P_{Verlust} = I_{IN}^2 \times R_{total,hot} = (3\text{ A})^2 \times 0,0304\text{ Ω} ≈ 274\text{ mW}$$
+
+*Resultierende Temperaturerhöhung (ΔT):*
+- Thermischer Widerstand aus Datenblatt: R_θJA = 75°C/W (Max, Steady-State)
+- ΔT = P_Verlust × R_θJA = 0,274 W × 75°C/W ≈ 20,5°C
+
+**Bewertung:**
+Eine maximale Verlustleistung von ca. 274 mW führt zu einer Erwärmung von ca. 21°C über der Umgebungstemperatur. Dies ist thermisch unkritisch und liegt weit innerhalb der Spezifikationen des Bauteils. Ein Platinenlayout, das die Kühlfläche des zentralen Drain-Pads berücksichtigt ("Best Practice"), ist für eine zuverlässige Wärmeabfuhr ausreichend.
+
 ### N-Kanal-MOSFETs
 **Baustein:** AO3400A  
 **Anwendung:** Digitale Schalter und Inverter
@@ -429,33 +454,78 @@ Da N-Kanal-MOSFETs in diesem Design ausschliesslich für Logikfunktionen eingese
 **Alternative:** Jeder andere Logic-Level-N-Kanal-MOSFET kann verwendet werden.
 
 ### P-Kanal-MOSFETs
-**Baustein:** MDD2301  
-**Anwendungen:** Power-Multiplexer, Backup-MUX, SD-Kartenversorgung
 
-Der kritischste Anwendungsfall ist der Power-Multiplexer mit bis zu 3 A Strombelastung.
+#### Allgemeine Anwendungen
+**Baustein:** AO3401A  
+**Anwendung:** Digitale Schalter und Load-Switches
 
-**Technische Daten:**
+Für allgemeine P-Kanal-MOSFET-Anwendungen (analoge Ergänzung zum AO3400A) wird der AO3401A als kostengünstiger Standard-Typ eingesetzt. Er bietet ausreichende Parameter für alle Logic-Level-Anwendungen bei geringen bis mittleren Strömen.
 
-| Parameter | Wert |
+**Alternative:** Jeder andere Logic-Level-P-Kanal-MOSFET kann verwendet werden.
-|-----------|------|
-| Gehäuse | SOT-23 |
-| R_DS(on) @ 4,5 V | typ. 33 mΩ, max. 45 mΩ |
-| R_DS(on) @ 2,5 V | typ. 46 mΩ, max. 60 mΩ |
-| Thermischer Widerstand | R_θJA = 100 K/W |
-| Leckstrom | I_DSS < 1 μA @ -10 V |
 
-**Thermische Auslegung (Power-Multiplexer bei 3 A, Worst Case):**
+#### Hochstrom-Anwendungen
+**Baustein:** AON5820 für BQ25672-Schalter, AO3401A für SD/VRTC-Schalter
+**Anwendungen:** Bidirektionale Schalter (BQ25672), VRTC-Schalter, SD-Kartenversorgung
 
-Verlustleistung:
+##### MOSFET-Verteilung nach Anwendung:
-$$P_{loss} = R_{DS(on)} \cdot I^2 = 45\text{ mΩ} \cdot (3\text{ A})^2 = 405\text{ mW}$$
+- **AON5820 (N-Channel):** Bidirektionale Schalter im BQ25672 (Ladungspumpe verfügbar)
+- **AO3401A (P-Channel):** SD-Karten- und VRTC-Schalter (nur 3,3V-Logik verfügbar)
 
-Temperaturerhöhung:
+Diese differenzierte Auswahl optimiert sowohl die elektrischen Eigenschaften als auch die Ansteuerungskompatibilität.
-$$\Delta T = P_{loss} \cdot R_{\theta JA} = 405\text{ mW} \cdot 100\text{ K/W} = 40,5\text{ K}$$
 
-**Spannungsabfall-Analyse (Backup-MUX bei 2 mA):**
+##### Anwendung im VRTC-Schalter:
-$$\Delta U = R_{DS(on)} \cdot I = 45\text{ mΩ} \cdot 2\text{ mA} = 0,09\text{ mV}$$
+Der VRTC-Pfad erfordert nur unidirektionalen Schutz (DC/DC → VRTC), daher genügt ein einzelner P-Channel MOSFET:
+- **Konfiguration:** Source an 3,3V (DC/DC), Drain an VRTC
+- **Logik:** Gate LOW → VRTC aktiv, Gate HIGH → VRTC getrennt
+- **Vorteil:** Bei Ausfall bleibt VRTC isoliert vom DC/DC-Converter
 
-Beide Anwendungsfälle liegen deutlich innerhalb der Spezifikationsgrenzen.
+##### Thermische Auslegung (VRTC-Schalter bei 2 mA):
+Bei den geringen Strömen im VRTC-Pfad ist die Verlustleistung vernachlässigbar:
+$$P_{loss} = I^2 \times R_{DS(on)} = (2\text{ mA})^2 \times 50\text{ mΩ} ≈ 0,2\text{ μW}$$
+
+##### Anwendung bei SD-Kartenversorgung:
+Für die SD-Kartenversorgung wird der **AO3401A** (P-Channel) verwendet, da nur 3,3V Gate-Spannung verfügbar ist.
+
+##### MOSFET-Auswahl für 3,3V-Logik:
+- **Problem mit N-Channel (AON5820):** VGS = 3,3V reicht nicht für vollständiges Durchschalten
+- **Lösung P-Channel (AO3401A):** VGS = 0V → EIN, VGS = 3,3V → AUS
+- **RDS(on) bei VGS = -3,3V:** 50 mΩ typ. (deutlich besser als N-Channel bei unzureichender VGS)
+
+##### Thermische Auslegung (SD-Karte bei Schreibvorgängen):
+- Maximaler Schreibstrom: 100 mA (kurzzeitig)
+- Verlustleistung: $P_{loss} = I^2 \times R_{DS(on)} = (100\text{ mA})^2 \times 50\text{ mΩ} = 500\text{ μW}$
+- Temperaturerhöhung: $\Delta T = 500\text{ μW} \times 250\text{ K/W} = 0,125\text{ K}$
+- **Spannungsabfall:** $V_{drop} = I \times R_{DS(on)} = 100\text{ mA} \times 50\text{ mΩ} = 5\text{ mV}$
+
+##### Soft-Start-Auslegung mittels RC-Gatebeschaltung:
+Die SD-Karte ist mit 10 μF + 100 nF gepuffert. Um Einschaltströme zu begrenzen, wird eine RC-Schaltung am Gate implementiert:
+
+###### Auslegungskriterien:
+- Kondensatorladung: $Q = C \times V = 10,1\text{ μF} \times 3,3\text{ V} = 33,3\text{ μC}$
+- Zulässiger Ladestrom: $I_{max} = 100\text{ mA}$ (thermisch unkritisch)
+- Mindest-Anstiegszeit: $t_{rise,min} = \frac{Q}{I_{max}} = \frac{33,3\text{ μC}}{100\text{ mA}} = 333\text{ μs}$
+
+###### RC-Dimensionierung:
+- Gate-Kapazität des AO3401A: $C_{gate} ≈ 350\text{ pF}$
+- Mindest-Gate-Zeitkonstante: $\tau_{gate,min} = \frac{t_{rise,min}}{3} ≈ 100\text{ μs}$
+- **Auslegungsformel:** $R_{min} = \frac{\tau_{gate,min}}{C_{gewählt}}$
+
+###### Praktische Beispiele:
+- Mit C = 100 nF: $R_{min} = \frac{100\text{ μs}}{100\text{ nF}} = 1\text{ kΩ}$
+- Mit C = 10 nF: $R_{min} = \frac{100\text{ μs}}{10\text{ nF}} = 10\text{ kΩ}$
+- Mit C = 1 nF: $R_{min} = \frac{100\text{ μs}}{1\text{ nF}} = 100\text{ kΩ}$
+
+###### Empfohlene Beschaltung:
+- **Mindestempfehlung:** R = 1 kΩ, C = 100 nF (schnell und verfügbar)
+- **Konservativ:** R = 10 kΩ, C = 10 nF (langsamere Flanken)
+
+###### Bewertung 1 kΩ/100 nF:
+- Anstiegszeit: ≈ 300 μs (3 × τ = 3 × 100 μs)
+- Ladestrom bleibt unter 100 mA
+- Spannungsabfall nur 5 mV → vernachlässigbar
+- Schnelle SD-Karten-Verfügbarkeit für zeitkritische Anwendungen
+
+Alle Anwendungsfälle liegen deutlich innerhalb der Spezifikationsgrenzen.
 
 ## Referenzen und Datenblätter
 
@@ -464,7 +534,7 @@ Alle Datenblätter der verwendeten Bauteile sind in diesem Repository verfügbar
 ### Energiemanagement-ICs
 - **[XB4908A](datasheets/LiIon%20Protection/XB4908.pdf)** - Li-Ion-Schutzschaltung mit integrierten MOSFETs (XySemi)
 - **[bq27441-G1](datasheets/Fuel%20Gauge/bq27441-g1.pdf)** - Fuel Gauge IC (Texas Instruments)
-- **[bq24296M](datasheets/Charger/bq24296m.pdf)** - Hocheffizienter Lader-IC mit integrierter Synchronous-Switching-Architektur (Texas Instruments)
+- **[BQ25672](datasheets/Charger/bq25672.pdf)** - Hochintegrierter Buck-Boost-Lader mit Power-Multiplexer (Texas Instruments)
 
 ### USB-Erkennung
 - **[bq24230](datasheets/USB%20Detection/bq24230.pdf)** - USB-Ladegeräteerkennung und -charakterisierung (Texas Instruments)
@@ -476,7 +546,8 @@ Alle Datenblätter der verwendeten Bauteile sind in diesem Repository verfügbar
 
 ### Diskrete Halbleiter
 - **[AO3400A](datasheets/MOSFET/ao3400a.pdf)** - N-Kanal-Logic-Level-MOSFET für digitale Schaltanwendungen (Alpha & Omega Semiconductor)
-- **[MDD2301](datasheets/MOSFET/mdd2301.pdf)** - P-Kanal-Power-MOSFET für Leistungsschalter bis 3 A (Diodes Incorporated)
+- **[AO3401A](datasheets/MOSFET/ao3401a.pdf)** - P-Kanal-Logic-Level-MOSFET für digitale Schaltanwendungen (Alpha & Omega Semiconductor)
+- **[AON5820](datasheets/MOSFET/aon5820.pdf)** - Dual-N-Kanal-Power-MOSFET für bidirektionale Schalter bis 3 A (Alpha & Omega Semiconductor)
 
 ---
 

doc/README.de.md

@@ -2,5 +2,7 @@
 Dieses Verzeichnis enthält die Dokumentation zum Projekt.
 Im Verzeichnis [datasheets](datasheets) sind die Datenblätter der verwendeten Komponenten enthalten, sofern diese relevant sind. Ich habe mir gespart, zu jedem Widerstand das Datenblatt herunterzuladen.
 
+## Konzept
+
 ## Design
 [Energieversorgung](Hardware_PowerSupply.de.md)