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Low Duty LCD Segment Driver For Automotive COG Application - BU91R66CH-M (New)

BU91R66CH-M is a 1/4, 1/3, 1/2 Duty or Static COG type LCD driver that can be used for automotive applications and can drive up to 960 LCD Segments.
This driver can be cascaded up-to maximum of 4 drivers for larger LCD panel application. It supports VA LCD displays, which has better optical performance with higher LCD voltage driving and higher frame frequency driving.
This driver includes read function for display data and command registers, wherein it is possible to detect malfunction due to noise. It can also support other error detections such as interface checksum detection, glass breaking detection, logic error detection and SEG / COM toggle detection.
A defective mounting of COG can easily be controlled by using terminals to measure ITO resistance. It can support operating temperature of up to +105°C and compliant for AEC-Q100, as required for Automotive Application.

Part Number | BU91R66CH-M3BW
Status | Active
Package | Au Bump chip
Unit Quantity | 7200
Minimum Package Quantity | 7200
Packing Type | Tray
RoHS | Yes


Common Standard

AEC-Q100 (Automotive Grade)



Segment Element



1/4, 1/3, 1/2, Static


1/3, 1/2

Elements of MUX 1:1


Elements of MUX 1:2


Elements of MUX 1:3


Elements of MUX 1:4


Interface [line serial]

2wire / 3wire

Interface Voltage (Min.)[V]


Interface Voltage (Max.)[V]


Power Supply for LCD (Min.)[V]


Power Supply for LCD (Max.)[V]


LCD Driving Waveform


Operating Temperature (Min.)[°C]


Operating Temperature (Max.)[°C]



  • AEC-Q100 Compliant
  • 1/4, 1/3, 1/2 Duty or Static Drive Selectable
    1/4 Duty Drive: Max 960 Segments
    1/3 Duty Drive: Max 720 Segments
    1/2 Duty Drive: Max 480 Segments
    Static Drive: Max 240 Segments
  • Integrated Buffer AMP for LCD Driving
  • Integrated Oscillator Circuit for LCD frame frequency
  • Support External Clock Input
  • Integrated EVR Function to Adjust LCD Contrast
  • Integrated Power On Reset Circuit
  • No External Components
  • Low Power Consumption Design
  • Support INHb terminal to control Display ON/OFF
  • Configurable COM Driving Order
  • Support Max 4 Drivers Cascade Connection (BU91R64 / R65 / R66CH-M Available)
  • Support Register and Display Data Read-back Function
  • Support LCD Contact Resistance Measurement
  • Support Error Detection and Status Read Function
    Glass Breaking Detection
    Interface Checksum
    Logic Error Detection
    SEG / COM Toggle Detection