BU91796BMUF-ME2

Overview

The BU91796BMUF-ME2 is an automotive-grade LCD segment driver manufactured by ROHM Semiconductor. It supports up to 80 segments with a 1/4 duty and 1/3 bias configuration. The device operates on a 2-wire serial interface (I2C) with a maximum clock frequency of 300 kHz. It functions within a supply voltage range of 2.5 V to 6 V, drawing a maximum power supply current of 30 uA. Power dissipation is rated at 700 mW. The component is housed in a VQFN-32-FBV050 package and meets AEC-Q100 Grade 2 standards for operation between -40°C and +105°C.

Feature Summary

• Supports low duty cycle driving for LCD displays with up to 80 segments using 1/4 duty and 1/3 bias ratios.
• Integrates display RAM to reduce microcontroller load and eliminate the need for external components.
• Features wettable flank VQFN packaging to facilitate visual inspection of solder joints and enhance mounting reliability.
• Complies with AEC-Q100 Grade 2 qualification standards for automotive environmental and operational requirements.

Applications

• Automotive instrument cluster displays
• Vehicle information system screens
• Dashboard indicator panels

Procurement Notes

Verify the specific suffix ME2 against the official datasheet to confirm the package variant and tape-and-reel specifications. Confirm that the AEC-Q100 Grade 2 rating aligns with your target automotive application environment. Check for any functional safety support documentation if required for system-level safety analysis. Ensure compatibility with the 2-wire serial interface protocol used in the host design.

Selection Notes

Select this component when designing automotive displays requiring high reliability and compact footprint. The VQFN-32-FBV050 package offers a small 5x5 mm form factor suitable for space-constrained PCB layouts. The integrated RAM simplifies firmware development by handling segment data storage internally. Verify that the 2.5 V to 6 V operating range matches the system power supply rails.

Part Context

This part belongs to the BU91796 series of low-duty LCD segment drivers designed specifically for automotive applications. It shares core functionalities with variants like the BU91796MUF-ME2 but differs in package type and qualification grade. The series is characterized by low power consumption and robust performance under extreme temperature conditions typical of vehicle interiors.

Replacement Considerations

The BU91796MUF-ME2 is listed as an alias or related variant in public records. However, it utilizes a different package (VQFN-32FV5050 vs VQFN-32-FBV050). Direct substitution requires verifying pinout compatibility and ensuring the alternative package meets the mechanical constraints of the existing board design.