LP5868中文资料8 × 18 LED matrix driver with 8-bit analog and 8-/16-bit PWM dimming数据手册TI规格书

描述 Description

Electronic devices are becoming smarter, requiring to use larger quantity of LEDs for animation and indication purposes. A high performance LED matrix driver is required to improve user experience with small solution size.

The LP586x devices are a family of high performance LED matrix drivers. The device integrates 18 constant current sinks with N (N = 1/2/4/6/8/11) switching MOSFETs to support N × 18 LED dots or N × 6 RGB LEDs. The LP5868 integrates eight MOSFETs for up to 144 LED dots or 48 RGB LEDs.

The LP5868 supports both analog dimming and PWM dimming methods. For analog dimming, each LED dot can be adjusted with 256 steps. For PWM dimming, the integrated 8-bit or 16-bit configurable PWM generators enable smooth and audible-noise-free dimming control. Each LED dot can also be arbitrarily mapped into 8-bit group PWM to achieve dimming control together.

The LP5868 device implements full addressable SRAM to minimize the data traffic. The ghost-cancellation circuitry is integrated to eliminate both upside and downside ghosting. The LP5868 also supports LED open and short detection functions. Both 1-MHz (maximum) I2C and 12-MHz (maximum) SPI are available in LP5868.

特性 Features

• LED matrix topology:
• Configurable for 1 to 8 scan switches
• Operating voltage range:
• Logic pins compatible with 1.8 V, 3.3 V, and 5 V
• 18 constant current sinks with high precision:
• Device-to-device error: ±3% when channel current = 50 mA
• Phase-shift for balanced transient power
• Ultra-low power consumption:
• Standby mode: ICC ≤ 10 uA when EN = High and CHIP_EN = 0 (data retained)
• Flexible dimming options:
• Analog dimming (current gain control)
• 3 groups of 7-bit Color Current (CC) setting for red, green, and blue
• PWM dimming with audible-noise-free frequency
• 3 programmable groups of 8-bit PWM dimming for LED dot arbitrary mapping
• Full addressable SRAM to minimize data traffic
• Deghosting and low brightness compensation
• 1-MHz (max.) I2C interface when IFS = Low
• 12-MHz (max.) SPI interface when IFS = High