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BU21029MUV-E2 Scheda tecnica(PDF) 11 Page - Rohm |
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BU21029MUV-E2 Scheda tecnica(HTML) 11 Page - Rohm |
11 / 29 page 11/26 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 ●Specification of Touch Detection BU21029MUV executes its touch detection function by outputting an interrupt signal at pin INT once it is able to detect touch. The circuit diagram of the touch detection function is shown on the following figure. XP YP YN PGND 50kΩ 90kΩ PVDD PU90K (register) Control Logic INT Short when touch screen is touched High when XP or YP dirvers ON GND ON Figure 4. Touch detection circuit When the touch panel is connected to the panel interface terminals (XP, XN, YP, YN), pin XP is connected to PVDD through an internal pull-up resistor inside the IC and pin YN is connected to PGND. During a no-touch state, BU21029MUV will be on standby. During this time, INT outputs "H" through an internal pull-up resistor. Since pins XP and YN are connected to the touch screen through contact resistance, the resistance ratio of the internal pull-up resistance and the touch screen resistance is able to detect the voltage drop at pin XP whenever the screen is touched. This results to an "L" output at INT. When touch is detected and pins XP and YP is put to drive state by each scanning operation, the internal pull-up resistance is disconnected from pin XP and the output of pin INT is held at "L". |
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