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BU21029MUV-E2 Datasheet(PDF) 3 Page - Rohm |
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BU21029MUV-E2 Datasheet(HTML) 3 Page - Rohm |
3 / 29 page 3/26 Datasheet Datasheet BU21029MUV TSZ02201-0Y1Y0F300110-1-2 © 2011 ROHM Co., Ltd. All rights reserved. 11.Nov.2013 Rev.004 www.rohm.co.jp TSZ22111・15・001 ●Block Diagram ●OVERVIEW BU21029MUV is a controller for 4-wire resistive touch screens. It has built-in 12-bit SAR A/D converter, clock oscillator, power on reset circuit, and LDO regulator for internal blocks and operates with 1.65-3.60V single power supply. Aside from being able to detect single point coordinates and touch pressure like existing 4-wire resistive touch screen controllers can, it can also detect dual coordinates by generating data based on the prearranged touch screen parameters. Communication between BU21029MUV controller and the host processor uses 2-wire serial interface. The BU21029MUV, being the I2C slave device, is controlled by the host processor by writing to its registers. This way, the host processor sets whether the touch screen controller operates under command control mode or under automatic control mode. In automatic control mode, the host processor reads the touch data saved by the controller in its internal registers at any time. Preprocess A/D conversion is continuously done for several times in one driving time. Data is median average processed; meaning data is sorted and calculation that takes the average from the center of the sorted data is performed. Interrupt control The BU21029MUV sends an interrupt signal to the host processor through INT, an active-low pin, whenever it detects touch on the screen. In automatic control mode, this happens after the scan of the first touch is completed. 2-point detection function The 2-point detection function of BU21029MUV can be used by calibrating the circuit for 2-point detection based on the inherent panel perimeters (registers 0x3, 0x4). Since the characteristics of each touch panel differ significantly, it is necessary for the host processor to execute the calibration of parameters to match the 2-point detection circuit of BU21029MUV with every touch panel. Power control After a conversion function has been completed, the BU21029MUV automatically powers down in order to reduce current consumption. In automatic control mode, scanning restarts automatically from power down when the touch screen is operated. Power on reset BU21029MUV has built-in power-on-reset circuit. If the host processor will not be used to control RSTB pin, RSTB pin can be shorted to VDD. This way, the registers of BU21029MUV initialize upon power-on. |
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