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AK4185_10 PDF预览

AK4185_10

更新时间: 2024-11-18 07:16:11
品牌 Logo 应用领域
AKM 控制器
页数 文件大小 规格书
30页 515K
描述
Low Power Touch Screen Controller with SPI? Interface

AK4185_10 数据手册

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[AK4185]  
AK4185  
Low Power Touch Screen Controller with SPI™ Interface  
GENERAL DESCRIPTION  
The AK4185 is a 4-wire/ 5-wire resistive touch screen controller that incorporates 12bit SAR A/D  
converter. The AK4185 operates down to 1.6V supply voltage in order to connect a low voltage  
microprocessor. The AK4185 has both an automatic continuous measurement and a measurement data  
calculation function. The functions that normally require external processing, such as calculating the  
average screen input value, are processed by the AK4185. In addition, a new sequential mode achieves  
short coordinate measurement time while greatly reducing the microprocessor overhead. The AK4185  
can detect the pressed screen location by performing two A/D conversions and it can also measure touch  
pressure. The AK4185 is the best fit for cellular phone, DSC, DVC, smart phone, or other portable  
devices.  
FEATURES  
„ 4-wire or 5-wire Touch Screen Interface  
„ SPITM Serial Interface  
„ 12bit SAR A/D Converter with S/H circuit  
„ Sampling Rate: 300Ksps  
„ Pen Pressure Measurement (4-wire)  
„ Continuous Read Function (External Clock Mode)  
„ Integrated Internal Osc (Sequence Mode)  
„ Integrated Median Averaging Filter  
„ Low Voltage Operation: VDD = 1.6V ~ 3.6V  
„ PENIRQN Buffer Output  
„ Low Power Consumption: 240μA at 1.8V  
„ Auto Power Down  
„ Package: 12pin CSP (1.96mm x 1.46mm, pitch 0.5mm)  
„ Software Compatible with AK4182A  
VDD  
CSN  
DIN  
XP/BR  
YP/TR  
4/5wire  
Touch  
Screen  
Drivers  
Interface  
SPI  
Serial I/F  
&
VREF+  
AIN+  
AIN-  
SAR  
ADC  
SCLK  
Control  
Logic  
XN/TL  
YN/BL  
MUX  
DOUT  
VREF-  
IN/  
WIPER  
PENIRQN  
TEMP  
Internal  
Osc  
VSS  
Figure 1. Block Diagram  
SPITM is a registered trademark of Motorola, Inc.  
MS0954-E-05  
2010/10  
- 1 -  

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