TLC5942RHBT

Overview

The TLC5942RHBT is a Texas Instruments LED driver IC featuring 16 constant current outputs in a VQFN-32 package. It supports 12-bit PWM dimming and includes a 7-bit grayscale dot correction capability for uniform brightness. The device operates on a supply voltage range of 3 V to 5.5 V, with an output current of 50 mA per channel and a maximum output voltage of 32 V. It utilizes a serial interface for data input and features an internal oscillator operating at 30 MHz. The component functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates 12-bit PWM dimming resolution for precise light control across all channels.
• Includes 7-bit grayscale dot correction to ensure consistent visual appearance among LEDs.
• Provides constant current regulation with programmable output current levels.

Applications

• High-resolution segment display systems
• LED matrix backlighting applications
• General-purpose LED lighting control circuits

Procurement Notes

Verify the specific suffix 'RHBT' corresponds to the VQFN-32 package and tape-and-reel delivery format. Confirm that the required 50 mA output current and 32 V compliance voltage align with the target LED load specifications. Ensure the design accounts for the thermal performance limits defined in the datasheet for the selected operating environment.

Selection Notes

Select this component when 16 individually addressable channels with high-resolution grayscale control are required. The integrated dot correction feature makes it suitable for applications demanding high visual uniformity without external calibration hardware. Consider the VQFN-32 footprint constraints and the need for a serial data interface compatible with standard microcontrollers or shift registers.

Part Context

This part belongs to the TLC594x series of LED drivers from Texas Instruments, designed for multi-channel LED control. Unlike the TLC59401 which offers higher current, or the TLC5947 with more channels, the TLC5942 balances channel count with moderate current drive and advanced correction features. It shares architectural similarities with other members of the family but differs in specific electrical ratings and pin configurations.

Replacement Considerations

Potential substitutes include the TLC5942RHBR (same function, different reel packaging) or the TLC59401RHBR if higher output current is acceptable. The TLC5946RHBT may be considered if 16 channels are needed but different interface requirements apply. Verify pin compatibility and thermal characteristics before substitution.

FAQ

What is the purpose of the 7-bit grayscale dot correction?

It allows for per-channel adjustment to compensate for manufacturing variations in LED forward voltage, ensuring uniform brightness across the display.

How is the output current determined?

The output current is set by an external resistor connected to the Iref pin, allowing for programmable current levels up to the maximum rating.