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BU21025GUL-E2 Scheda tecnica(PDF) 10 Page - Rohm |
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BU21025GUL-E2 Scheda tecnica(HTML) 10 Page - Rohm |
10 / 19 page BU21025GUL TSZ02201-0Y2Y0F300050-1-2 © 2012 ROHM Co., Ltd. All rights reserved. 7.AUG.2012 Rev.002 www.rohm.com TSZ22111・15・001 10/15 Datasheet Datasheet Touch Detection A touch detection function of BU21025GUL is automatically enabled after wakeup. BU21025GUL inform that touch screen is touched or not by INT pin when touch detection is enabled. Output level of INT becomes low during screen is touched. In this state, XP pin is pulled-up high by pull-up resistor (RPU) and YN pin is connected to GND. A resistance of RPU is selectable from either 50 kohm (default) or 90 kohm by the setup command. When the screen isn’t touched, XP is connected to VDD trough the pull-up resistor. When the screen is touched, XP is connected to GND trough the screen and BU21025GUL detect touch. When a received command is not setup (1011), the touch detection is disabled and RPU is disconnected from XP pin. And output level of INT is fixed high or low by each command (see Table 3 for details about operation code). When BU21025GUL receives software reset command (0101), touch detection is enabled after the 2 nd acknowledge timing. When BU21025GUL receives A/D conversion with PD=0 commandn touch detection is enabled after an A/D conversion is finished. When BU21025GUL receives a driving screen voltage or an A/D conversion with PD=1 command, touch detection is not enable automatically. A method for re-enable the touch detection is sending new command that return to enable touch detection. The set power command is almost same as an A/D conversion command. ON GND XP YP XN YN ON RPU INT VDD OFF Control logic Figure 4. Touch Detection Circuit Digital Filter BU21025GUL has a Median Average Filter (MAF) as a digital filter for noise reduction. When the MAF is enabled, BU21025GUL operates A/D conversion 7 times and stores converted data. Next, these stored data are sorted. An output data of MAF is an average value of middle three values of the sorted data. An abnormal value becomes difficult to affect the results. So noise reduction performance of MAF is higher than one of normal average filter. When the MAF is disabled, BU21025GUL operates A/D conversion one times and output the converted data The MAF is enabled in defaults and is changed by the setup command. |
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