Texas Instruments TPS3852G18QDRBRQ1

Overview

TPS3852G18QDRBRQ1 from Texas Instruments is a high-accuracy AEC-Q100 Grade 1 voltage supervisor with integrated window watchdog timer, featuring 0.8% undervoltage threshold accuracy over –40°C to +125°C, ±15% factory-programmed watchdog/reset timing accuracy, and 10 µA typical supply current. It monitors 1.8 V rails in automotive ADAS and telematics control units.

For engineers reviewing the TPS3852G18QDRBRQ1 datasheet, TPS3852G18QDRBRQ1 pinout, TPS3852G18QDRBRQ1 application, or TPS3852G18QDRBRQ1 equivalent, key selection criteria include its precision 1.8 V monitoring capability, programmable window watchdog with dual boundary timing (tWDL/tWDU), open-drain RESET/WDO outputs, manual reset input (MR), and wettable-flank 3-mm × 3-mm VSON package for optical solder inspection.

Technical Context

The TPS3852G18QDRBRQ1 implements a precision undervoltage detection circuit with 0.5% hysteresis and a dedicated window watchdog state machine that requires WDI falling edges to occur strictly between tWDL(max) and tWDU(min). Its internal 375 nA CWD charging current enables capacitor-based timing adjustment or factory-set delays via CWD pin configuration (NC or 10 kΩ pullup).

It operates across 1.6 V–6.5 V supply range with AEC-Q100 Grade 1 qualification (–40°C to +125°C ambient), HBM ±2000 V / CDM ±750 V ESD rating, and supports both fixed-reset delay (tRST = 200 ms typ) and independent watchdog fault flagging via WDO-without triggering full system reset.

Key Specifications

Pinout & Package

TPS3852G18QDRBRQ1 is housed in an 8-pin VSON package (3.00 mm × 3.00 mm) with exposed thermal pad connected internally to GND. The package features wettable flanks for AOI-compatible solder joint verification.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor with watchdog applications.

Compared with TPS3852G18QDRBRQ1, TPS3851G18QDRBRQ1 offers identical precision supervision but omits window watchdog logic, while MAX6373KA18+T trades AEC-Q100 compliance and programmability for higher threshold accuracy in legacy SOIC packaging - making TPS3852G18QDRBRQ1 uniquely suited for ASIL-B automotive systems requiring both precision and timing-fault discrimination.

Availability

TPS3852G18QDRBRQ1 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, telematics control units, vision processor boards, and FPGA-based safety controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3852G18QDRBRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive-grade ICs and functional safety solutions.

The TPS385x-Q1 product line delivers AEC-Q100 qualified voltage supervisors with integrated window watchdogs specifically designed for ASIL-B automotive systems including ADAS, infotainment, and chassis control units.

FAQ

What is the nominal monitored voltage for TPS3852G18QDRBRQ1?

The TPS3852G18QDRBRQ1 is factory-configured for 1.8 V rail supervision, with undervoltage threshold V_ITN = 1.8 V × (1 − 0.8%) = 1.784 V (typical). This value is laser-trimmed during production and maintains ±0.8% accuracy across –40°C to +125°C, as confirmed in the SBVS285 datasheet Section 6.5.

How does the CWD pin configure watchdog timing on TPS3852G18QDRBRQ1?

The CWD pin on TPS3852G18QDRBRQ1 selects watchdog timing mode: unconnected (NC) or pulled up to VDD with 10 kΩ resistor enables factory-programmed t_WDL/t_WDU (800/1600 ms typ); connecting a capacitor (100 pF–1 µF) to GND enables user-adjustable timing per t_WDU(s) = 77.4 × C_CWD(µF) + 0.055. Internal 375 nA current source charges C_CWD to determine boundaries.

Can TPS3852G18QDRBRQ1 be used for 3.3 V rail supervision?

No - TPS3852G18QDRBRQ1 is specifically trimmed for 1.8 V nominal monitoring. For 3.3 V rails, Texas Instruments specifies TPS3852G33QDRBRQ1 (V_ITN = 3.3 V). Using TPS3852G18QDRBRQ1 on 3.3 V would assert RESET continuously since VDD exceeds V_ITN + V_HYST by >1.5 V, violating intended supervision range.

What is the function of the SET1 pin on TPS3852G18QDRBRQ1?

The SET1 pin on TPS3852G18QDRBRQ1 controls watchdog enable/disable: grounding SET1 disables the watchdog timer, forcing WDO into high-impedance state and ignoring WDI inputs. This is essential during firmware development or FPGA configuration to prevent spurious timeouts. When SET1 is high, watchdog operates normally with window timing enforcement.

Does TPS3852G18QDRBRQ1 support simultaneous RESET and WDO assertion?

No - TPS3852G18QDRBRQ1 asserts WDO only when RESET is high. When RESET is low (e.g., during undervoltage or MR assertion), WDO enters high-impedance state regardless of WDI activity. This design isolates watchdog fault signaling from power-fail conditions, enabling independent diagnostic reporting during normal operation.