BD87B29FVM-CTR

Overview

The BD87B29FVM-CTR is an automotive-grade voltage detector IC with an integrated watchdog timer, manufactured by Rohm Semiconductor. It features a typical detection voltage of 2.9V with ±2.0% precision and supports a reset active voltage range from 2V to 20V. The device utilizes an open-drain output type and operates within a temperature range of -40°C to 125°C. Key electrical parameters include a circuit current of 4.5µA when ON and 3µA when OFF, with a hysteresis voltage defined as VDET multiplied by 0.036. The watchdog timer activates within the range of VDET plus hysteresis up to 20V. Packaged in an SSOP-6 format, it meets AEC-Q100 Grade 1 standards for functional safety support.

Feature Summary

• Integrates under-voltage detection reset and watchdog timer functions for microcontroller supervision
• Maintains low static current consumption across wide input voltage ranges up to 20V
• Allows external adjustment of reset delay time and watchdog monitoring duration via capacitors
• Supports selectable fixed or variable reset detection voltages through external resistors

Applications

• Microcontroller system reset supervision in automotive environments
• Watchdog timer implementation for clock signal monitoring
• Redundancy enhancement in vehicle electronic control units
• Power supply monitoring for safety-critical automotive subsystems

Procurement Notes

Verify that the specific part number matches the required package configuration and thermal specifications for your application. Confirm compliance with AEC-Q100 Grade 1 requirements if functional safety analysis is necessary. Ensure external component values for timing adjustments align with the datasheet recommendations to maintain accurate reset and watchdog intervals. Check RoHS status and packaging details before finalizing procurement orders.

Selection Notes

Select this component when both voltage monitoring and watchdog timer capabilities are required in a single package. Consider the 2.9V threshold and ±2.0% precision for applications needing stable reset points. Evaluate the SSOP-6 footprint against available PCB space. Verify that the open-drain output compatibility matches the target microcontroller's input requirements. Assess the need for adjustable timing features versus fixed internal delays.

Part Context

This device belongs to Rohm's automotive voltage detector series designed for high reliability. It complements other models like the BD87B46FVM-CTR which offers different voltage thresholds. The integration of watchdog functionality distinguishes it from basic reset ICs, providing comprehensive system protection. It is engineered specifically for harsh automotive conditions, ensuring long-term stability and performance.

Replacement Considerations

Direct substitutes may include other Rohm automotive voltage detectors with similar pinouts and functionalities, such as variants within the BD87Bxx series. Verify equivalent voltage thresholds, package dimensions, and thermal characteristics before substitution. Cross-reference AEC-Q100 certification levels to ensure maintained safety integrity.