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Analog Devices Inc./Maxim Integrated MAX20478BATBF/VY+
- Part No.:
- MAX20478BATBF/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX20478BATBF/VY+.pdf
- Description:
- MAX20478BATBF/VY+
- Quantity:
- Payment:
- Shipping:
Inventory:1,792
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Product details
Overview
MAX20478BATBF/VY+ from Analog Devices is a fully integrated ASIL D-compliant automotive voltage monitor SoC with three configurable voltage inputs (IN1–IN3), programmable windowed watchdog, and dual reset outputs (RESET1/RESET2). It supports 0.5V–3.6875V monitoring on IN1/IN2 (12.5mV steps) and 0.5V–5.6V on IN3 (20mV steps), ±0.8% threshold accuracy, and operates from -40°C to +125°C. Used in ADAS power supervision for microcontroller health assurance.
For engineers reviewing the MAX20478BATBF/VY+ datasheet, MAX20478BATBF/VY+ pinout, MAX20478BATBF/VY+ application, or MAX20478BATBF/VY+ equivalent, key selection factors include ASIL D compliance, triple-input voltage monitoring resolution, windowed watchdog timing configurability, OTP-based configuration integrity, and AEC-Q100 Grade 0 qualification for under-hood deployment.
Technical Context
The MAX20478BATBF/VY+ implements a digitally configurable analog monitoring architecture with on-chip reference (VREF), internal oscillator, and error-correcting OTP memory for permanent configuration storage. Its three independent input channels support simultaneous OV/UV detection with selectable thresholds (90–110% of nominal) and ±0.8% absolute accuracy over temperature.
Watchdog functionality includes windowed timeout detection with programmable enable/disable via WDDIS, and dual open-drain RESET outputs with independent assertion timing control. All monitoring logic and reset generation are hardened for automotive fault tolerance per ISO 26262 ASIL D requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.35V to 5.50V - supports direct connection to automotive 3.3V or 5V rails without external regulators. |
| Input Voltage Range (IN1/IN2) | 0.5V to 3.6875V in 12.5mV steps - enables precise monitoring of core logic supplies (e.g., 1.2V, 1.8V, 3.3V). |
| Input Voltage Range (IN3) | 0.5V to 5.6V in 20mV steps - accommodates higher-voltage analog or sensor supplies (e.g., 5V ADC references). |
| OV/UV Threshold Accuracy | ±0.8% - ensures reliable fault detection across full temperature range (-40°C to +125°C) without calibration. |
| Operating Current | 125µA - minimizes quiescent load on always-on battery domains in vehicle ECU sleep modes. |
| Package | 10-pin side-wettable TDFN (3mm × 3mm) - enables automated optical inspection (AOI) and improves solder joint reliability in automotive reflow. |
Pinout & Package
10-pin side-wettable TDFN package with exposed thermal pad (3mm × 3mm), optimized for high-reliability automotive PCB assembly and thermal dissipation in constrained spaces.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 2.35V–5.50V; powers internal analog/digital blocks and reference circuitry. |
| GND | Ground reference | Common return path for all analog and digital functions; connects to exposed pad for thermal and EMI performance. |
| IN1, IN2, IN3 | Monitor input terminals | Three independent analog inputs; each supports programmable OV/UV thresholds with ±0.8% accuracy. |
| RESET1, RESET2 | Open-drain reset outputs | Configurable active-low reset signals for MCU or SoC power-on reset and fault recovery sequencing. |
| WDI | Watchdog input | Edge-triggered input for windowed watchdog timer; requires periodic toggling to prevent timeout assertion. |
| WDDIS | Watchdog disable control | Active-high digital input to permanently disable watchdog function during debug or safe mode. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D compliance | Fully certified per ISO 26262 for safety-critical automotive systems requiring highest functional safety integrity. |
| Triple independent voltage monitors | Simultaneous monitoring of three distinct supply rails (e.g., MCU core, I/O, sensor bias) with separate OV/UV thresholds. |
| Windowed watchdog | Detects both early and late watchdog pulses, preventing false resets due to clock jitter or software timing drift. |
| OTP with ECC | One-time-programmable configuration memory with error-correcting code ensures tamper-resistant, field-verified settings across lifetime. |
| AEC-Q100 Grade 0 | Qualified for operation up to +150°C junction temperature, enabling placement near high-heat sources in engine compartments. |
Applications
| ADAS Power Supervision | Autonomous Driving SoC Monitoring |
|---|---|
Use Scenario: Real-time voltage supervision of camera ECU power rails during active vision processing. IC Role / Device Role / Timing Role: Monitors 1.2V core, 1.8V I/O, and 3.3V interface supplies; asserts RESET1 on any OV/UV fault to initiate controlled shutdown. Use Value: Prevents corrupted image data or unsafe actuator commands caused by undervoltage brownout or overvoltage surge. | Use Scenario: Health monitoring of multi-core AI accelerator SoC with distributed voltage domains. IC Role / Device Role / Timing Role: Simultaneously tracks 0.85V GPU core, 1.2V memory interface, and 5V sensor hub supply; triggers RESET2 on watchdog timeout. Use Value: Enables fail-safe fallback to redundant compute path before thermal or logic faults propagate. |
| Remote Sensor Node Supervision | Automotive Gateway Microcontroller Watchdog |
Use Scenario: Compact battery-powered radar sensor module operating in low-power wake-up cycles. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output and 5V transceiver supply; uses ultra-low 125µA current to extend battery life. Use Value: Maintains system-level power integrity while minimizing standby current impact on 10-year battery lifespan. | Use Scenario: Central vehicle gateway managing CAN FD, Ethernet, and LIN communication stacks. IC Role / Device Role / Timing Role: Provides windowed watchdog supervision of main MCU firmware execution and dual reset control for peripheral isolation. Use Value: Detects software lockup or bus arbitration failure without requiring external timing components or PCB space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20477BATBF/VY+ | Two-input variant (IN1/IN2 only); identical watchdog, reset, and OTP features; same package and ASIL D compliance. | Lacks IN3 monitoring channel - unsuitable where third rail (e.g., 5V sensor bias) must be supervised. | Select MAX20477BATBF/VY+ only when system has exactly two critical supplies to monitor. |
| TLV809EADBZR | Single-channel 3.3V supervisor with fixed OV threshold (1.5% accuracy), no watchdog, no OTP, no AEC-Q100 Grade 0 rating. | Not ASIL D capable; limited to non-safety-critical subsystems like infotainment USB power sequencing. | Use TLV809EADBZR only for cost-sensitive, non-safety applications with single-rail monitoring needs. |
Compared with MAX20477BATBF/VY+, the MAX20478BATBF/VY+ adds a third monitoring channel for expanded system coverage; compared with TLV809EADBZR, it delivers ASIL D certification, windowed watchdog, and triple-rail precision-enabling deployment in safety-critical ADAS ECUs without architectural compromise.
Availability
MAX20478BATBF/VY+ is available at Aetrix Electronics and suitable for advanced driver-assistance systems, autonomous driving processing units, and remote sensor modules requiring stable component supply across extended automotive temperature ranges and long production lifecycles.
Supply support for MAX20478BATBF/VY+ 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The MAX20478 product line delivers ASIL D-certified, highly integrated power supervision SoCs specifically engineered for functional safety compliance in automotive ECUs, reducing design complexity and validation effort for ADAS and autonomous systems.
FAQ
What is the primary safety certification of the MAX20478BATBF/VY+?
The MAX20478BATBF/VY+ is certified to ASIL D per ISO 26262, with full documentation of fault injection test results, FMEDA analysis, and diagnostic coverage metrics. This certification applies to the complete device including its OTP configuration, watchdog logic, and dual reset outputs - making MAX20478BATBF/VY+ suitable for use in safety-critical automotive functions such as brake-by-wire and steering control monitoring.
How many voltage inputs does the MAX20478BATBF/VY+ support, and what are their ranges?
The MAX20478BATBF/VY+ supports three independent voltage inputs: IN1 and IN2 monitor 0.5V–3.6875V in 12.5mV steps, while IN3 monitors 0.5V–5.6V in 20mV steps. Each input has separately programmable OV/UV thresholds with ±0.8% accuracy. This triple-input capability is fixed for MAX20478BATBF/VY+ and distinguishes it from the two-input MAX20477BATBF/VY+ variant.
Does the MAX20478BATBF/VY+ require external passive components for basic operation?
The MAX20478BATBF/VY+ requires only one external component - a 100nF bypass capacitor on VDD - for stable operation. No external resistors, timing capacitors, or pull-up/pull-down networks are needed for voltage monitoring, watchdog, or reset functionality. This minimal BOM reduces PCB area, assembly cost, and qualification effort for MAX20478BATBF/VY+ designs.
What is the purpose of the WDDIS pin on the MAX20478BATBF/VY+?
The WDDIS pin on the MAX20478BATBF/VY+ is an active-high digital input that permanently disables the windowed watchdog timer when asserted. This allows deterministic deactivation during factory programming, diagnostic modes, or fail-safe states without altering OTP configuration. Unlike software-controlled watchdog disable, WDDIS provides hardware-level override that remains effective even if MCU firmware is unresponsive - a key requirement for MAX20478BATBF/VY+ ASIL D compliance.
Is the MAX20478BATBF/VY+ qualified for under-hood automotive environments?
Yes, the MAX20478BATBF/VY+ is AEC-Q100 Grade 0 qualified, rated for operation from -40°C to +125°C ambient temperature with guaranteed performance up to +150°C junction temperature. Its side-wettable TDFN package supports automated optical inspection and robust solder joints, making MAX20478BATBF/VY+ suitable for engine control units, transmission controllers, and other under-hood applications demanding long-term reliability.
MAX20478BATBF/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Monitor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 10-TDFN (3x3)
MAX20478BATBF/VY+ FAQ
1.How can I place an order for MAX20478BATBF/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20478BATBF/VY+ 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 MAX20478BATBF/VY+ reliable?
The price and inventory of MAX20478BATBF/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20478BATBF/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20478BATBF/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20478BATBF/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20478BATBF/VY+?
MAX20478BATBF/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20478BATBF/VY+ 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 MAX20478BATBF/VY+?
For technical support, including MAX20478BATBF/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20478BATBF/VY+ requirements.
6.How does Aetrix verify that MAX20478BATBF/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20478BATBF/VY+ 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 MAX20478BATBF/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20478BATBF/VY+?
All MAX20478BATBF/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20478BATBF/VY+, 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 MAX20478BATBF/VY+ part is unused and in its original packaging.
Return procedure for MAX20478BATBF/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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