IS32LT3183A 4-Channel LED Controller

Lumissil's IS32LT3183A is a fully-integrated LIN RGB+W LED controller consisting of a LIN transceiver, a LIN protocol engine, four configurable high-voltage GPIO outputs, and a programmable MCU. It is ideal for cost-effective ambient light modules connected to the automotive LIN bus and is compliant with all the latest LIN standards assuring interoperability with current and future automotive lighting in door trim, dashboard, and other lighting applications.

The IS32LT3183A is designed for ambient and animated automotive lighting applications compliant with LIN 2.0 A/2.1 A/2.2 A as well as SAE J2602 bus standards. For accurate color rendition, the integrated math co-processor and Flash memory handle color calibration, software animation patterns, LED fade, and color transition functions. The four independent outputs have built-in direct and indirect temperature monitoring that enables temperature compensation to ensure accurate color and brightness levels over the full operating temperature range of -40°C to +125°C.

The IS32LT3183A's flexible GPIOs can be programmed for either LED driver or serial bus interface functionality. They can be configured as an I²C master or SPI master interface to create a LIN to serial bus bridge or they can be configured as standard I/Os with ADC, interrupt and de-bounce capability. When configured as an LED driver, the four high voltage I/Os can be programmed to sink up to 60 mA of LED current with 16-bit PWM dimming and spread spectrum for lowering the EMI noise floor.

The IS32LT3183A's integrated MCU is a single-cycle 8051-based CPU with a watchdog timer, math co-processor with 32 kB Flash and 2 kB SRAM ECC-protected memory for fast reliable data manipulations. For ease of use it supports a node auto-addressing capability using the bus shunt method (BSM) to detect the relative position of slave devices within the automotive LIN bus. The LIN master can then send RGB color, intensity, and control instructions to a specific IS32LT3183A device and read back its operating status and error information at 19.2 kbps data rates.

The IS32LT3183A can operate from a wide 5.5 V to18 V range for reliable performance even when the vehicle’s supply fluctuates, such as during stop-start operation. It also includes built-in protection features such as 40 V load dump, battery overvoltage, and undervoltage detection. To minimize current consumption, the IS32LT3183A supports a sleep mode with LIN bus wakeup capability. An integrated 12-bit SAR ADC can be used for power management, GPIO analog readback, and LED temperature/aging compensation algorithms.