基于SX8652设计的4线和5线电阻触摸屏控制技术
sx8652是semtech公司的非常低功耗高度可靠的 4线和5线电阻触摸屏控制器,输入电压从1.65v到3.7v,具有工作在74ksps的精密高速12位sar adc,吞吐量为5000(x-y)座标/秒.关断模式小于1ua,spi串行接口.主要应用在手机,数码相机,激光打印机和mp3播放器.本文介绍了sx8652主要特性, 简化方框图以及4线和5线触摸屏应用框图与sx8652 评估板电路图.
the sx8652 is a very low power, high reliability controller for 4-wire and 5-wire resistive touch screens used in pdas, portable instruments and point-of-sales terminal applications. it features a wide input supply range from 1.65v to 3.7v and low power modes to preserve current when the screen is unintentionally touched.
to compute touch screen x-y coordinates and touch pressure with precision, a low power 12-bit analog-digital converter is activated with the possibility to enable on-chip data averaging processing algorithms to reduce host activity and suppress system noise.
the touch screen controller inputs have been specially designed to provide robust on-chip esd protection of up to ±15kv in both hbm and contact discharge, and eliminates the need for external protection devices. the sx8652 is controlled by a high speed spi™ serial interface.
the sx8652 is available in a 4.0 mm x 3.0 mm 14-dfn package and a 1.5 mm x 2.0 mm wafer level chip scale package (wlcsp) for space conscience applications.
extremely low power consumption: 23ua@1.8v 8ksps
superior on-chip esd protection
_±15kv hbm (x+,x-,y+,y-)
_±2kv cdm
_±25kv air gap discharge
_±15kv contact discharge
_±300v mm
sx86524主要特性:
single 1.65v to 3.7v supply/reference
4-wire or 5-wire resistive touch screen interface
integrated preprocessing block to reduce host loading and bus activity
four user programmable operation modes provides
flexibility to address different application needs
_manual, automatic, pen detect, pen trigger
low noise ratiometric conversion
precision, high speed 12-bit sar adc operating at 74k sps
throughput: 5000 (x-y) coordinates/second (c/s) with 7-sample averaging
low power shut-down mode < 1ua
spi™ serial interface
touch pressure measurement (4-wire)
auxiliary input (4-wire) for alternate adc input or start of conversion trigger
hardware & software reset
-40℃ to +85℃ operation
pb-free, halogen free, rohs/weee compliant product
windows ce 6.0, linux driver support available
packages: 14-ld (4.0 mm x 3.0 mm) dfn 12-ball (1.5 mm x 2.0 mm) wlcsp
sx86524应用:
cell phone
digital still camera
laser printer
mp3 player
图1.sx8652简化方框图
图2.sx8652应用框图
图3.sx8652 4线触摸屏应用框图
图4.sx8652 5线触摸屏应用框图
sx8652 评估板
the sx8652evk is the board for evaluation of the 4/5 wire resistive touch screen controller sx8652. it is provided with a 4-wire touch screen to ease the evaluation.
no external supply is needed to power the board. a usb cable is provided to connect the evk to a windows based pc for operation of the software.
the evaluation kit is composed of the following parts:
i) the board with the sx8652 and the touch screen on the top
ii) a usb cable to connect the board to the pc
iii) a cdrom with the installation files and the user guide
iv) a stylus to write on the touch screen
this evaluation board contains the following main components that can be identified from the schematics in section
sx8652 in dfn package
ft2232d with the quartz : usb to spi controller
m93c46 eeprom : usb initialization information
sn74lvc8t245 : level shifter
sc1563:regulator for 3.3v and 1.85v
4-wire touchscreen connected in j5
图5.sx8652 评估板电路图
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the sx8652 is a very low power, high reliability controller for 4-wire and 5-wire resistive touch screens used in pdas, portable instruments and point-of-sales terminal applications. it features a wide input supply range from 1.65v to 3.7v and low power modes to preserve current when the screen is unintentionally touched.
to compute touch screen x-y coordinates and touch pressure with precision, a low power 12-bit analog-digital converter is activated with the possibility to enable on-chip data averaging processing algorithms to reduce host activity and suppress system noise.
the touch screen controller inputs have been specially designed to provide robust on-chip esd protection of up to ±15kv in both hbm and contact discharge, and eliminates the need for external protection devices. the sx8652 is controlled by a high speed spi™ serial interface.
the sx8652 is available in a 4.0 mm x 3.0 mm 14-dfn package and a 1.5 mm x 2.0 mm wafer level chip scale package (wlcsp) for space conscience applications.
extremely low power consumption: 23ua@1.8v 8ksps
superior on-chip esd protection
_±15kv hbm (x+,x-,y+,y-)
_±2kv cdm
_±25kv air gap discharge
_±15kv contact discharge
_±300v mm
sx86524主要特性:
single 1.65v to 3.7v supply/reference
4-wire or 5-wire resistive touch screen interface
integrated preprocessing block to reduce host loading and bus activity
four user programmable operation modes provides
flexibility to address different application needs
_manual, automatic, pen detect, pen trigger
low noise ratiometric conversion
precision, high speed 12-bit sar adc operating at 74k sps
throughput: 5000 (x-y) coordinates/second (c/s) with 7-sample averaging
low power shut-down mode < 1ua
spi™ serial interface
touch pressure measurement (4-wire)
auxiliary input (4-wire) for alternate adc input or start of conversion trigger
hardware & software reset
-40℃ to +85℃ operation
pb-free, halogen free, rohs/weee compliant product
windows ce 6.0, linux driver support available
packages: 14-ld (4.0 mm x 3.0 mm) dfn 12-ball (1.5 mm x 2.0 mm) wlcsp
sx86524应用:
cell phone
digital still camera
laser printer
mp3 player
图1.sx8652简化方框图
图2.sx8652应用框图
图3.sx8652 4线触摸屏应用框图
图4.sx8652 5线触摸屏应用框图
sx8652 评估板
the sx8652evk is the board for evaluation of the 4/5 wire resistive touch screen controller sx8652. it is provided with a 4-wire touch screen to ease the evaluation.
no external supply is needed to power the board. a usb cable is provided to connect the evk to a windows based pc for operation of the software.
the evaluation kit is composed of the following parts:
i) the board with the sx8652 and the touch screen on the top
ii) a usb cable to connect the board to the pc
iii) a cdrom with the installation files and the user guide
iv) a stylus to write on the touch screen
this evaluation board contains the following main components that can be identified from the schematics in section
sx8652 in dfn package
ft2232d with the quartz : usb to spi controller
m93c46 eeprom : usb initialization information
sn74lvc8t245 : level shifter
sc1563:regulator for 3.3v and 1.85v
4-wire touchscreen connected in j5
图5.sx8652 评估板电路图
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