Lumissil IS32LT3138

The IS32LT3138 is an 18 channel, current sink LED driver that allows up to 64 devices to be cascaded, for a total of 1152 individually controlled channels. It is targeted at the automotive lighting market utilizing hundreds of LEDs for achieving vivid and bright animations as found in welcome and rear lamps that span the entire width of a vehicle. The IS32LT3138 supports a high-speed 1MHz UART interface compatible with the CANFD physical layer and integrates Cyclical Redundancy Checks (CRC), a powerful error-detection and correction method for reliable communication between the MCU and other IS32LT3138 devices.

Key features

• 1MHz UART compatible with the CANFD physical layer
• Programmable watchdog timer and CRC functions
• 12-bit PWM dimming and 7-bit analog dimming registers
• EMC performance: slew rate control, clock spread spectrum, channel and clock phase shift

Additional features

• Wide input voltage supply from 4.5V to 16V
• Maximum output voltage 16V
• UART Communication Interface
  • Compatible with CANFD physical layer, 1MHz maximum
  • With CRC to ensure robust communication
  • 64 addressable devices
  • Fail safe mode with watch dog timer
     
• 18 channels capable of 100mA each
  • ±4.5% @ 100mA bit-to-bit output current mismatch
  • ±5% @ 100mA device-to-device output current accuracy
     
• 64 steps (6-bit) global current setting
• Individual 128 steps (7-bit) DC current adjustment to each channel
• Combined for higher current capability with same current accuracy
  • Minimum headroom voltage of 0.5V (Max.) at 100mA
     
• Individual PWM dimming to each channel
  • 4096 steps (12-bit) PWM duty cycle setting
    • 7+5-bit at 24kHz
    • 12-bit at 244Hz
    • 8-bit at 24kHz
  • Phase delay minimizes inrush current (6 groups)
     
• Slew rate control and spread spectrum optimize EMI performance
• DC Binning support (ADJR pin)
• Fault protection with reporting
• AEC-Q100 qualification in progress
• Operating temperature range (-40°C ~ +125°C)
• WFQFN-32 (5mm×5mm) package
• RoHS & Halogen-Free, and TSCA compliance

Applications

• Animation rear light
• Animation tail light
• Animation daytime running light
• Animation welcome light