Texas Instruments TPS3850G12DRCR

Overview

TPS3850G12DRCR from Texas Instruments is a precision voltage supervisor IC with integrated programmable window watchdog timer, designed for high-reliability power-rail monitoring in microcontroller and SoC systems. It delivers 0.8% threshold accuracy over –40°C to +125°C, supports 1.6 V–6.5 V supply range, features open-drain RESET and WDO outputs, and enables ±4% or ±7% fault windows on rails from 0.9 V to 5.0 V - used in ultrasound scanners and active antenna systems.

For engineers reviewing the TPS3850G12DRCR datasheet, TPS3850G12DRCR pinout, TPS3850G12DRCR application, or TPS3850G12DRCR equivalent, this page provides verified functional identity, validated 10-pin VSON package mapping, confirmed watchdog timing ratios (1:2, 1:4, 3:4), factory- and capacitor-programmable reset/watchdog delays, and real-world use cases in medical, telecom, and industrial embedded systems.

Technical Context

The TPS3850G12DRCR implements dual independent timing paths: one for RESET delay (programmed via CRST pin using capacitor or 10-kΩ pullup) and another for window watchdog boundaries (set by CWD pin plus SET0/SET1 logic). Its precision window comparator uses trimmed internal references and achieves 0.5% hysteresis, enabling robust immunity to rail noise and glitch-induced false triggers.

Watchdog operation requires a falling edge on WDI within a dynamically defined time window bounded by tWDL and tWDU - both configurable across eight combinations of CWD connection (NC, 10-kΩ, capacitor) and SET0/SET1 states. The device disables watchdog functionality when SET0 = SET1 = 1 and CWD = NC or 10-kΩ, supporting development-mode safety.

Key Specifications

Pinout & Package

TPS3850G12DRCR is housed in a 3.00-mm × 3.00-mm, 10-pin VSON (DRC) package with exposed thermal pad connected internally to GND. The package supports automated optical inspection and offers low thermal resistance (R_θJA = 52.3°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision and watchdog timer applications.

Compared with TPS3851G12DRCR and MAX6373KA29+T, the TPS3850G12DRCR uniquely balances precision window supervision, field-programmable watchdog timing, and minimal 10-pin VSON footprint - making it optimal for space-constrained, high-integrity systems where both OV/UV detection and dynamic firmware health checking are mandatory.

Availability

TPS3850G12DRCR is available at Aetrix Electronics and suitable for ultrasound scanners, active antenna systems, robot servo drives, and infusion pumps requiring stable component supply across extended temperature and long product lifecycles.

Supply support for TPS3850G12DRCR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in high-reliability power management ICs.

The TPS3850G12DRCR belongs to TI's precision voltage supervisor family, engineered specifically for mission-critical embedded systems demanding simultaneous rail monitoring and deterministic watchdog enforcement - such as medical imaging, 5G infrastructure, and industrial automation.

FAQ

What is the function of the CRST pin on the TPS3850G12DRCR?

The CRST pin on the TPS3850G12DRCR programs the reset timeout period. It accepts an external capacitor (0.1–1000 nF) to set delays from 703 µs to 3.22 s, a 10-kΩ pullup to VDD for factory-programmed 8.5–11.5 ms, or can be left unconnected for default 170–230 ms. Internal evaluation takes 381 µs after SENSE enters valid window.

Does the TPS3850G12DRCR support both overvoltage and undervoltage detection on the same rail?

Yes, the TPS3850G12DRCR performs simultaneous overvoltage (VIT+(OV)) and undervoltage (VIT-(UV)) detection on the SENSE pin with 0.8% accuracy across –40°C to +125°C. It supports common rails from 0.9 V to 5.0 V and offers ±4% or ±7% fault windows with 0.5% hysteresis to prevent oscillation near thresholds.

How does the window watchdog timer operate on the TPS3850G12DRCR?

The TPS3850G12DRCR window watchdog requires a falling edge on WDI between tWDL (lower boundary) and tWDU (upper boundary). Boundaries are set by CWD pin (capacitor/resistor/NC) and SET0/SET1 logic, yielding ratios like 1:2 or 3:4. WDO asserts low for tRST duration only when RESET is high and watchdog is enabled.

What package type and dimensions does the TPS3850G12DRCR use?

The TPS3850G12DRCR uses a 3.00-mm × 3.00-mm, 10-pin VSON package (DRC variant) with exposed thermal pad. Pin pitch is 0.5 mm, body thickness is 0.5 mm, and thermal pad must be soldered to PCB ground for R_θJA = 52.3°C/W performance.

Can the watchdog function be disabled on the TPS3850G12DRCR during development?

Yes, the watchdog on the TPS3850G12DRCR can be disabled by setting SET0 = SET1 = 1 while connecting CWD to NC or a 10-kΩ pullup to VDD. In this mode, WDI is ignored, and WDO remains high-impedance - enabling safe firmware debugging without unintended timeouts in robot servo drive prototypes.