ab1805-t3

@@ -33,5 +33,132 @@   "author": {     "name": "Ray",     "email": "[email protected]"+  },+  "component": {+    "mpn": "AB1805-T3",+    "manufacturer": "Abracon LLC",+    "package": "QFN-16(3x3)",+    "pin_count": 17,+    "category": "Real-time Clocks (RTC)",+    "parts": {+      "symbol": "ab1805-t3.kicad_sym",+      "footprint": "ab1805-t3.kicad_mod",+      "model_3d": "ab1805-t3-etched.glb",+      "model_3d_plain": "ab1805-t3.glb",+      "model_3d_step": "ab1805-t3-etched.step",+      "model_3d_step_plain": "ab1805-t3.step",+      "lbr": "ab1805-t3.lbr"+    },+    "pins": [+      {+        "number": "1",+        "name": "nRST",+        "type": "output",+        "description": "Active-low external reset output (open-drain). Requires an external pull-up when used; polarity is set by the RSP register bit (defaults to active-low on POR). Can be left floating if unused."+      },+      {+        "number": "2",+        "name": "WDI",+        "type": "input",+        "description": "Watchdog Timer reset input. Can also generate the External 2 interrupt (polarity via EX2P, enabled by EX2E); state readable in the WDIN bit. No internal pull; must be tied to VCC or VSS if unused to avoid extra current."+      },+      {+        "number": "3",+        "name": "nEXTR",+        "type": "input",+        "description": "Active-low external reset input. When low with RS1E set, drives nRST to its asserted state. No internal pull; must be tied to VCC or VSS if unused."+      },+      {+        "number": "4",+        "name": "PSW/nIRQ2",+        "type": "output",+        "description": "Secondary interrupt / power-switch output (open-drain). Selectable via OUT2S: OUTB value, SQW, /IRQ, /AIRQ, TIRQ, or a ~1 Ω power-switch to VSS (~50 mA continuous, 150 mA 1 s pulse) when PWR2 is set. May be left floating if unused."+      },+      {+        "number": "5",+        "name": "VBAT",+        "type": "power_in",+        "description": "Battery-backup power input (1.5-3.6 V). Also feeds the internal analog comparator input. Tie directly to VSS if no backup battery is used."+      },+      {+        "number": "6",+        "name": "SDA",+        "type": "bidirectional",+        "description": "I2C serial data line (up to 400 kHz). Open-drain; requires an external pull-up resistor to VCC."+      },+      {+        "number": "7",+        "name": "SCL",+        "type": "input",+        "description": "I2C serial clock input (up to 400 kHz). Requires an external pull-up resistor to VCC."+      },+      {+        "number": "8",+        "name": "CLKOUT/nIRQ3",+        "type": "output",+        "description": "Push-pull square-wave / clock / interrupt 3 output. Selectable to drive the OUT bit value or the SQW output when SQWE is set."+      },+      {+        "number": "9",+        "name": "VSS",+        "type": "power_in",+        "description": "Ground return. Must be connected together with the thermal pad (pin 17)."+      },+      {+        "number": "10",+        "name": "EXTI",+        "type": "input",+        "description": "External interrupt input. Generates the External 1 interrupt (polarity via EX1P, enabled by EX1E); state readable in the EXIN bit. No internal pull; must be tied to VCC or VSS if unused to avoid extra current."+      },+      {+        "number": "11",+        "name": "FOUT/nIRQ",+        "type": "output",+        "description": "Primary interrupt / function output (open-drain, requires external pull-up). Selectable via OUT1S: OUT bit, inverted combined IRQ, SQW output when SQWE is set, or inverted alarm interrupt AIRQ. Held low on power-up until the AB1805 exits reset and is accessible via the serial interface."+      },+      {+        "number": "12",+        "name": "nTIRQ",+        "type": "output",+        "description": "Active-low timer interrupt output (open-drain, only present on the I2C variant). Requires an external pull-up when used; may be left floating if unused."+      },+      {+        "number": "13",+        "name": "VCC",+        "type": "power_in",+        "description": "Primary system supply input (1.5-3.6 V; absolute max 3.8 V). Must be connected if a single supply is used."+      },+      {+        "number": "14",+        "name": "AF",+        "type": "passive",+        "description": "Autocalibration filter pin. Requires an external 47 pF ceramic capacitor from this pin to VSS for accurate Autocalibration-mode timing."+      },+      {+        "number": "15",+        "name": "XO",+        "type": "output",+        "description": "32.768 kHz crystal oscillator output. Integrated load capacitor and feedback resistor; connect directly to the crystal (no external caps required)."+      },+      {+        "number": "16",+        "name": "XI",+        "type": "input",+        "description": "32.768 kHz crystal oscillator input. Integrated load capacitor and feedback resistor; connect directly to the crystal (no external caps required)."+      },+      {+        "number": "17",+        "name": "VSS",+        "type": "power_in",+        "description": "Exposed thermal / ground pad on the bottom of the QFN-16 package. Must be connected to VSS."+      }+    ],+    "provenance": {+      "rebuilt": "component block rebuilt 2026-10-05 from this page's own README pinout table and .kicad_sym (pins cross-checked), no re-extraction"+    },+    "viewers": {+      "symbol": "viewers/symbol.html",+      "footprint": "viewers/footprint.html"+    }   }-}\ No newline at end of file+}