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BU21025GUL-E2 Scheda tecnica(PDF) 10 Page - Rohm

Il numero della parte BU21025GUL-E2
Spiegazioni elettronici  4-wire Resistive Touch Screen Controller
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Produttore elettronici  ROHM [Rohm]
Homepage  http://www.rohm.com
Logo ROHM - Rohm

BU21025GUL-E2 Scheda tecnica(HTML) 10 Page - Rohm

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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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