TPS3823

@@ -0,0 +1,50 @@+# TPS3823++**Texas Instruments** · Voltage supervisor · SOT-23-5++Watches a supply rail and a microcontroller at once: it holds RESET asserted until the rail rises above a fixed threshold and a 200 ms delay elapses, and a watchdog input (WDI) must be toggled by the MCU within a time-out or the supervisor issues a reset. A manual-reset input (MR) forces a reset on command. That covers both brownout and firmware-hang recovery in one small SOT-23-5. A common companion to any microcontroller that must recover itself.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | RESET | output | Active-low reset output, push-pull. Asserts low while VDD is below the negative-going threshold VIT- (e.g. 2.93 V nominal for TPS3823-33) and remains low for the delay time td (200 ms nom) after VDD rises above the threshold. Also asserts on MR pulled low or on watchdog time-out. |+| 2 | GND | power_in | Ground / device return. |+| 3 | MR | input | Manual reset input, active low. Pulling MR low forces RESET low; RESET remains asserted while MR is low and for the delay time td after MR returns high. Has an internal ~90 kOhm pullup to VDD, so it can be left unconnected or tied to VDD when unused. |+| 4 | WDI | input | Watchdog timer input. Must be toggled (rising or falling edge) within the watchdog time-out t_tout (1.6 s nominal for TPS3823) or a reset is triggered. If WDI is left floating the device internally generates pulses to prevent a watchdog reset; WDI must be driven fully high or fully low for the watchdog to detect an error. |+| 5 | VDD | power_in | Supply voltage input. Powers the device and is the monitored rail. Recommended operating range 1.1 V to 5.5 V (absolute max 6 V). Place a 0.1 uF ceramic bypass capacitor close to this pin for best threshold stability. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Voltage supervisor + watchdog |+| Threshold | Fixed (order code) |+| Reset delay | 200 ms (typ) |+| Watchdog | WDI time-out |+| Manual reset | MR input |+| Output | Active-low RESET |+| Supply | 1.1-5.5 V |+| Package | SOT-23-5 |++## Ordering variants++- `TPS3823-33DBVR (3.3 V)`+- `TPS3823-50DBVR (5.0 V)`+- `TPS3823A-33DBVR (active-high reset)`++## CAD (KiCad official)++- Symbol: `Power_Supervisor:TPS3823-xxDBV (KiCad official)`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/tps3823.pdf) (34 pp, sha256 `3351e38aaf2f0a71`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/tps3823-datasheet.pdf)

@@ -0,0 +1,38 @@+{+  "slug": "tps3823",+  "version": "0.1.0",+  "type": "component",+  "description": "TI voltage supervisor with watchdog, SOT-23-5. Fixed reset threshold, 200 ms reset, windowless watchdog. Datasheet-verified.",+  "tags": [+    "component",+    "power",+    "supervisor",+    "reset-ic",+    "watchdog",+    "sot-23-5",+    "texas-instruments"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "tps3823.kicad_sym",+    "tps3823.kicad_mod",+    "tps3823.glb",+    "tps3823.step",+    "tps3823.lbr",+    "docs/hero.png",+    "docs/tps3823-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file