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Texas Instruments TPS3852H33DRBR
- Part No.:
- TPS3852H33DRBR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS3852H33DRBR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:2,677
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Product details
Overview
TPS3852H33DRBR from Texas Instruments is a precision voltage supervisor IC with integrated window watchdog timer, designed for 3.3-V rail monitoring in safety-critical systems. It delivers ±0.8% undervoltage threshold accuracy over –40°C to +125°C, 200-ms reset timeout (±15%), and programmable watchdog timing via CWD pin or factory defaults. Used in microcontroller power sequencing and fault detection.
For engineers reviewing the TPS3852H33DRBR datasheet, TPS3852H33DRBR pinout, TPS3852H33DRBR application, or TPS3852H33DRBR equivalent, key selection criteria include VITN = 3.168 V (3.3 V nominal), open-drain RESET/WDO outputs, manual reset (MR) support, SET1 watchdog enable/disable control, and VSON-8 package compatibility with tight-tolerance industrial and medical power rails.
Technical Context
The TPS3852H33DRBR implements a precision bandgap-based undervoltage comparator with 0.5% hysteresis and a state-machine-driven window watchdog timer. Its dual-threshold detection (VITN and VITN + VHYST) ensures stable reset assertion/deassertion during supply transients, while the independent WDO output enables fault isolation without full system reset.
Watchdog timing is determined either by internal factory-programmed delays (e.g., tWDL = 800 ms typ, tWDU = 1600 ms typ when CWD unconnected and SET1 = 1) or externally via CWD capacitor (0.1–1000 nF), with 375-nA constant-current charging and 1.21-V threshold. MR input overrides watchdog behavior and forces RESET assertion regardless of VDD level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VITN Accuracy | ±0.8% over –40°C to +125°C - guarantees reliable reset before microcontroller minimum supply tolerance is violated. |
| tRST | 200 ms ±15% - fixed reset timeout ensures sufficient hold time for processor initialization and clock stabilization. |
| VDD Range | 1.6 V to 6.5 V - supports wide-input supervision across 1.8-V, 2.5-V, 3.3-V, and 5-V rails without external scaling. |
| IDD | 10 µA typical - ultra-low quiescent current enables use in always-on, battery-backed, or energy-sensitive systems. |
| Hysteresis | 0.5% - prevents chatter on noisy supplies and eliminates need for external RC filtering in most industrial environments. |
| Watchdog Type | Window mode - requires WDI falling edge within tWDL(max) and tWDU(min); detects both early and late faults missed by standard watchdogs. |
| Output Type | Open-drain RESET and WDO - allows flexible pull-up to any compatible rail (e.g., 1.8 V, 3.3 V, or 5 V) and wired-OR connectivity. |
Pinout & Package
TPS3852H33DRBR is housed in a 3.00-mm × 3.00-mm, 8-pin VSON (DRB) package with exposed thermal pad connected internally to GND. The package supports high-density PCB layouts and provides low thermal resistance (RθJB = 25.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Supply input | Monitored rail input; must be ≥1.6 V for valid operation; bypass capacitor (0.1 µF) recommended for noise immunity. |
| CWD (Pin 2) | Watchdog timing control | Selects watchdog window: floating or 10-kΩ pull-up → factory defaults; capacitor to GND → user-programmable timing. |
| MR (Pin 3) | Manual reset input | Active-low asynchronous reset trigger; internally pulled up; asserts RESET regardless of VDD level or watchdog state. |
| GND (Pin 4) | Ground reference | Primary return path; thermal pad must be soldered to large-area ground plane for thermal and EMI performance. |
| SET1 (Pin 5) | Watchdog enable/disable | Logic low disables watchdog; WDI ignored; WDO goes high-Z; required to drive WDI to VDD or GND when disabled. |
| WDI (Pin 6) | Watchdog input | Falling-edge-triggered; must pulse within tWDL/tWDU window; ignored when RESET asserted or watchdog disabled. |
| WDO (Pin 7) | Watchdog output | Open-drain fault indicator; asserts low only when watchdog times out and RESET is high; enables selective fault response. |
| RESET (Pin 8) | Reset output | Open-drain system reset signal; asserts low on VDD < VITN or MR low; deasserts after tRST once VDD > VITN + VHYST. |
Key Features
| Feature | Design Value |
|---|---|
| Precision undervoltage monitoring | VITN = 3.168 V (for 3.3-V rail) with ±0.8% accuracy ensures compliance with tight MCU supply specs like ARM Cortex-M4/M7. |
| Factory-programmed watchdog timing | tWDL = 800 ms / tWDU = 1600 ms (typ) with ±15% accuracy eliminates external timing components and calibration effort. |
| User-programmable watchdog window | Capacitor-based timing (0.1–1000 nF) enables adjustable tWDU from 62.7 ms to 77.5 s - supports diverse firmware boot and runtime intervals. |
| Dual independent outputs | Separate open-drain RESET and WDO allow decoupled system reset and diagnostic signaling - critical for ASIL-B/C automotive and IEC 62304 medical designs. |
| Glitch-immune MR and WDI inputs | 5-µs minimum pulse width and built-in noise filtering prevent spurious resets in electrically harsh environments (e.g., motor drives, telematics). |
Applications
| Microcontroller Power Sequencing | Safety-Critical Telematics |
|---|---|
|
Use Scenario: Ensuring clean startup and brownout recovery for automotive infotainment MCUs operating from 3.3-V domain. IC Role / Device Role / Timing Role: Voltage supervisor and window watchdog - monitors VDD, asserts RESET on undervoltage, and validates firmware execution timing via WDI. Use Value: Prevents MCU lockup due to supply sag or software hang; WDO flag enables error logging without disrupting CAN communication stack. |
Use Scenario: Fault detection in ADAS domain controllers where continuous software health verification is mandated per ISO 26262. IC Role / Device Role / Timing Role: Independent watchdog timer with windowed timing - detects both stuck-at and runaway code conditions missed by single-boundary timers. Use Value: Enables fail-safe state transitions (e.g., torque limitation) upon WDO assertion, meeting ASIL-B diagnostic coverage requirements. |
| Industrial PLC I/O Modules | Patient Monitoring Equipment |
|
Use Scenario: Supervising 3.3-V FPGA configuration and real-time control logic in programmable logic controllers exposed to 8 kV ESD and conducted noise. IC Role / Device Role / Timing Role: Precision voltage monitor with 0.5% hysteresis and MR input - rejects transient noise while guaranteeing deterministic reset behavior. Use Value: Eliminates false resets during relay switching events; MR allows controlled reinitialization during field firmware updates. |
Use Scenario: Power integrity assurance for battery-powered ECG/SpO₂ modules requiring uninterrupted operation per IEC 60601-1 clause 15. IC Role / Device Role / Timing Role: Low-IDD (10 µA) supervisor with POR and UVLO - maintains supervision during standby while minimizing battery drain. Use Value: Extends battery life beyond 72 hours; ±0.8% VITN accuracy ensures reset occurs before analog front-end ADC reference drift exceeds clinical limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision and window watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3851H33DRBR | Single-threshold (non-window) watchdog; identical VITN, accuracy, and package; lacks WDO pin and window timing capability. | Suitable for simpler MCU reset-only use cases; cannot detect early watchdog timeouts or support diagnostic flagging. | Choose when window watchdog functionality is unnecessary and BOM cost reduction is prioritized over fault diagnostics. |
| MAX6373KA33+T | 3.3-V fixed-threshold supervisor with push-pull RESET; no watchdog; ±1.5% VITN accuracy; SO-8 package; higher IDD (25 µA). | Limited to basic power-on/brownout reset; no firmware execution monitoring; incompatible pinout and timing architecture. | Select only for legacy drop-in replacement where watchdog features are unused and SO-8 footprint is mandatory. |
Compared with TPS3852H33DRBR, TPS3851H33DRBR removes window watchdog capability but retains identical supervision accuracy and footprint, while MAX6373KA33+T offers lower integration and reduced precision-making TPS3852H33DRBR the sole option supporting ASIL-B-compliant dual-boundary fault detection in VSON-8.
Availability
TPS3852H33DRBR is available at Aetrix Electronics and suitable for industrial control systems, automotive telematics units, and medical patient monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TPS3852H33DRBR 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 power management, signal chain, and high-reliability IC design.
The TPS385x family was developed specifically for functional safety applications demanding precise voltage monitoring and robust window watchdog functionality in automotive, industrial, and medical systems.
FAQ
What is the exact undervoltage threshold voltage (VITN) for TPS3852H33DRBR?
The TPS3852H33DRBR has a nominal undervoltage threshold VITN of 3.168 V, corresponding to 96% of its 3.3-V nominal monitored rail. This value is guaranteed with ±0.8% accuracy across –40°C to +125°C, as confirmed in the Electrical Characteristics table of the SBVS302 datasheet.
Does TPS3852H33DRBR support both factory-programmed and user-adjustable watchdog timing?
Yes, TPS3852H33DRBR supports both modes: factory-programmed watchdog windows (e.g., tWDL = 800 ms / tWDU = 1600 ms typ when CWD is unconnected and SET1 = 1) and user-adjustable timing via capacitor on CWD pin (0.1–1000 nF), enabling tWDU from 62.7 ms to 77.5 s using the equation tWDU(s) = 77.4 × CCWD(µF) + 0.055.
How does the manual reset (MR) pin interact with the watchdog function in TPS3852H33DRBR?
When MR is asserted low, TPS3852H33DRBR immediately forces RESET low and disables the watchdog timer - ignoring all WDI activity. WDO enters high-impedance state. After MR is released, RESET remains low for tRST (200 ms typ), then deasserts if VDD > VITN + VHYST, and watchdog resumes normal operation if SET1 = 1.
What is the purpose of the SET1 pin on TPS3852H33DRBR, and how should it be used?
The SET1 pin on TPS3852H33DRBR enables or disables the window watchdog timer: grounding SET1 disables watchdog operation and forces WDO high-Z, while pulling SET1 high enables normal watchdog timing. When disabled, WDI must be driven to VDD or GND to avoid increased IDD; this feature simplifies development and debug phases.
Can TPS3852H33DRBR be used to supervise rails other than 3.3 V?
Yes, TPS3852H33DRBR can supervise any rail between 1.6 V and 6.5 V, including 1.8 V, 2.5 V, and 5 V. Its VITN is fixed at 3.168 V, so external resistor dividers are required for non-3.3-V rails. The device's 0.8% accuracy and 0.5% hysteresis remain valid, but divider tolerance and temperature drift must be accounted for in system design.
TPS3852H33DRBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.3V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SON (3x3)
TPS3852H33DRBR FAQ
1.How can I place an order for TPS3852H33DRBR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3852H33DRBR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS3852H33DRBR reliable?
The price and inventory of TPS3852H33DRBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3852H33DRBR is usually 5 days.
3.What payment methods are accepted for TPS3852H33DRBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3852H33DRBR transactions.
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4.How is shipping managed for TPS3852H33DRBR?
TPS3852H33DRBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3852H33DRBR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS3852H33DRBR?
For technical support, including TPS3852H33DRBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3852H33DRBR requirements.
6.How does Aetrix verify that TPS3852H33DRBR is sourced from the original manufacturer or authorized distributors?
All TPS3852H33DRBR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS3852H33DRBR meets industry standards.
7.What is the process for return or replacement of TPS3852H33DRBR?
All TPS3852H33DRBR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3852H33DRBR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS3852H33DRBR part is unused and in its original packaging.
Return procedure for TPS3852H33DRBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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