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首页FT5x16系列:单芯片多点触控液晶屏控制器
FT5x16系列:单芯片多点触控液晶屏控制器
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更新于2024-07-23
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"该资料是关于七寸液晶屏的,特别是FocalTech Systems Co., Ltd生产的FT5x16系列单芯片电容式触摸面板控制器。" 本文介绍的FT5x16系列集成电路是专为实现电容式触摸功能而设计的,内置微控制器单元(MCU),适用于七寸液晶屏。它们采用互电容技术,支持真正的多点触控,最多可识别5个触点的X和Y坐标。这种技术使得FT5x16系列非常适合应用于便携式设备,如手机、MIDs(移动互联网设备)和GPS导航设备。 FT5x16系列包括两种型号:FT5216和FT5316。它们的主要区别在于感应线的数量,FT5216支持多达16条发射线(TX lines)加10条接收线(RX lines),而FT5316则可以支持到21条发射线和12条接收线。这允许它们适应不同尺寸和复杂度的触摸面板设计。 FT5x16系列的一个关键特性是其抗RF干扰的能力,这意味着在有无线信号的环境中仍能保持稳定的工作。此外,这些控制器具有自动校准功能,对环境电容变化不敏感,确保了触摸面板在各种条件下都能准确工作。全可编程扫描序列支持功能允许用户自定义扫描模式,以优化性能并适应特定的应用场景。 FT5x16系列是针对七寸液晶屏设计的高性能电容式触摸解决方案,具备多点触控、抗干扰和自动校准等优势,旨在提供可靠且灵活的用户体验。对于开发便携式设备的工程师来说,这是设计先进人机交互界面的理想选择。
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FT5x16
DATASHEET- Preliminary
THIS DOCUMENT CONTAINS INFORMATION PROPRIETARY TO FOCALTECH SYSTEMS CO.,LTD., AND MAY NOT BE
REPRODUCED, DISCLOSED OR USED IN WHOLE OR PART WITHOUT THE EXPRESS WRITTEN PERMISSION OF FOCALTECH
SYSTEMS CO.,LTD.
Copyright © 2012, FocalTech Systems CO.,Ltd . All rights reserved Version 1.0 ︱Page 2 of 18
The main function for the AFE and AFE controller is to interface with the touch panel. It scans the panel by sending AC signals to the
panel and processes the received signals from the panel. So, it supports both Transmit (TX) and Receive (RX) functions. Key para-
meters to configure this circuit can be sent via serial interfaces, which will be explained in detail in a later section.
Enhanced MCU with DSP accelerator
For the Enhanced MCU, larger program and data memories are supported. Furthermore, a Flash ROM is implemented to store pro-
grams and some key parameters.
Complex signal processing algorithms are implemented by MCU and DSP accelerator to detect the touches reliably. Communication
protocol software is also implemented on this MCU to exchange data and control information with the host processor.
External Interface
I2C/SPI: an interface for data exchange with host
INT: an interrupt signal to inform the host processor that touch data is ready for read
RESETN: an external low signal reset the chip. the port is also use to wakeup the FT5x16 from the Hibernate mode.
A watch dog timer is implemented to ensure the robustness of the chip.
A voltage regulator to generate 1.8V for digital circuits from the input VDD3 supply
Power On Reset (POR) is active until VDDD is higher than some level and hold decades of
μs.
2.2 MCU
This section describes some critical features and operations supported by the enhanced MCU.
Figure 2-2 shows the overall structure of the MCU block. In addition to the enhanced MCU core, we have added the following circuits,
Program Memory: 32KB Flash
Data Memory: 4KB SRAM
A DSP accelerator is cooperate with MCU to process the Complex algorithms
Timer: A number of timers are available to generate different clocks
Master Clock: 24MHz
Clock Manager: To control various clocks under different operation conditions of the system
Figure 2-2 MCU Block Diagram
2.3 Operation Modes
FT5x16 operates in the following three modes:
Active Mode
When in this mode, FT5x16 actively scans the panel. The default scan rate is 60 frames per second. The host processor can configure
FT5x16 to speed up or to slow down.
Monitor Mode
When in this mode, FT5x16 scans the panel at a reduced speed. The default scan rate is 25 frames per second and the host processor
can increase or decrease this rate. When in this mode, most algorithms are stopped. A simpler algorithm is being executed to determine
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