Texas Instruments LP5867 7x6 LED Matrix Driver
Texas Instruments LP5867 7x6 LED Matrix Driver is a high-performance LED matrix driver that integrates six constant current sinks with N (N = 7) switching MOSFETs to support N × 6 LED dots or N × 2 RGB LEDs. The LP5867 integrates seven MOSFETs for up to 42 LED dots or 14 RGB LEDs.
The LP5867 supports both analog dimming and PWM dimming methods. For analog dimming, each LED dot can be adjusted with 256 steps. The integrated 8-bit or 16-bit configurable PWM generators enable smooth and audible-noise-free dimming control for PWM dimming. Each LED dot can also be arbitrarily mapped into 8-bit Group PWM to achieve dimming control together.
The Texas Instruments LP5867 device implements full addressable SRAM to minimize the data traffic. The ghost-cancellation circuitry is integrated to eliminate both upside and downside ghosting. The LP5867 also supports LED open and short detection functions. Both 1MHz (maximum) I2C and 12MHz (maximum) SPI are available in LP5867.
Features
- LED matrix topology
- Six constant current sinks with seven scan switches for 42 LED dots
- Configurable for 1 to 7 scan switches
- Operating voltage range
- VCC/VLED range of 2.7V to 5.5V
- Logic pins compatible with 1.8V, 3.3V, and 5V
- Six constant current sinks with high precision
- 0.1mA to 50mA per current sink when VCC ≥ 3.3V
- Device-to-device error: ±3% when channel current = 50mA
- Channel-to-channel error: ±3% when channel current = 50mA
- Phase-shift for balanced transient power
- Ultra-low power consumption
- Shutdown mode: ICC ≤ 1µA when EN = Low
- Standby mode: ICC ≤ 10µA when EN = High and CHIP_EN = 0 (data retained)
- Active mode: ICC = 4.2mA (typ.) when channel current = 5mA
- Full addressable SRAM to minimize data traffic
- Flexible dimming options
- Individual ON/OFF control for each LED dot
- Analog dimming (current gain control)
- Global 7-step Maximum Current (MC) setting for all LED dots
- Three groups of 7-bit Color Current (CC) RGB setting
- Individual 8-bit Dot Current (DC) setting for each LED dot
- PWM dimming with audible-noise-free frequency
- Global 8-bit PWM dimming for all LED dots
- Three programmable groups of 8-bit PWM dimming for LED dot arbitrary mapping
- Individual 8-bit or 16-bit PWM dimming for each LED dot
- Individual LED dot open/short detection
- De-ghosting and low brightness compensation
- Interface options
- 1MHz (max.) I2C interface when IFS = Low
- 12MHz (max.) SPI interface when IFS = High
Applications
- LED animation and indication for
- Portable electronics
- Wearables
- Internet-of-Things (IoT)
Simplified Schematic
Related Development Tool
Texas Instruments LP5867EVM Evaluation Module
Designed to evaluate the characteristics and usage of the LP5867 LED matrix driver.