Leadis LDS6040触摸控制和LED驱动方案

Leadis 公司的LDS6040是PureTouch容性触摸控制器,并集成了键盘LED驱动器和
VibeTonz®-Ready Haptics驱动器,从而能实现基于触摸的输入控制,包括滑动, 滚轮和按键. LDS6040具有15个传感器输入,每个传感器的更新速率为2ms,其中的8个传感器输入用来配置LED驱动器,驱动高达8mA的电流,而LED调光则由不同的瞬变时间实现,在最大输出电流时有32种调光.LED是由驱动器连接到传感器输入而自动激活的,因此不需要主处理器来点亮LED.因此可广泛应用在手机,MP3/MP4,游戏机,遥控和电视机等.本文介绍了LDS6040的主要特性,方框图以及应用电路框图.

LDS6040 PureTouch™ Capacitive Touch Controller with Integrated Keypad LED Driver and VibeTonz®-Ready Haptics Driver

The LDS6040 is a programmable touch controller with integrated VibeTonz®-Ready haptics driver and keypad LED drivers for use with capacitive sensor arrays implementing touch-based input controls including sliders, scroll wheels, and buttons. Featuring 15 sensor inputs, the LDS6040 provides fast update rates of 2ms per sensor input with on-chip automatic calibration logic continuously monitoring the environment to adjust ambient baseline levels to increase touch accuracy.

Eight of the 15 sensor inputs are configurable as LED drivers capable of driving up to 8mA of current, with 16mA available for a single LED by connecting to two LED drivers simultaneously. LED dimming may be configured over various transition times, with 32 dimming steps available at maximum current drive. Automatic activation of LED with a valid touch event is achieved by associating an LED driver to a sensor input, alleviating the need for the host processor to turn on the LED.

The device operates with a 1.8V touch supply voltage and LED and haptics supply voltage ranges of 3V to 5V. Consuming less than 150uW (typical) of power in full power mode (haptics in shutdown, no LEDs driving), the LDS6040 enables extremely low power consumption in full power mode. Both SPI-compatible and I2C-compatible interfaces are supported with a general-purpose input/output (GPIO) and interrupt output for additional communication with the host processor. The LDS6040 is packaged in a 5mm x 5mm 40ld TQFN package with maximum thickness of 0.8mm.

LDS6040主要特性:
Versatile, Accurate Capacitanceto-Digital Converter (CDC)
16-bit, 500kHz sigmadelta CDC
15 capacitance sensor input channels
2ms update rate per active sensor
Full-Featured Haptics Driver
Drives both linear and rotating actuators
Intelligent PWM input enabling automatic standby mode
Internal voltage regulator enables direct connection to Vbattery with no degradation
in haptics effects
Integrated Keypad LED Drivers
C7-C14 sensor inputs configurable as keypad LED drivers
8mA maximum driving current (16mA available by ganging two outputs to a single LED)
Flexible dimming control
Processor-free synchronization with touch events Integrated, Automatic Calibration Algorithms
Environmental compensation
On-chip RAM to store calibration data
Integrated Touch Preference Modes
Strongest Single Touch
Strongest Two Touches
Unrestricted (All) Touches

LDS6040应用:
Mobile handsets and smartphones
Personal music and media players (MP3/MP4)
Gaming devices
Remote controls
Television, A/V



图1.LDS6040方框图



图2.LDS6040应用方框图