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BU21025GUL データシート(PDF) 9 Page - Rohm

部品番号 BU21025GUL
部品情報  4-wire Resistive Touch Screen Controller
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メーカー  ROHM [Rohm]
ホームページ  http://www.rohm.com
Logo ROHM - Rohm

BU21025GUL データシート(HTML) 9 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
9/15
Datasheet
Datasheet
●Block Diagram
●Overview
Power On Reset
BU21025GUL requests that the Power On Reset Timing should be observed. If the Power On Reset Timing not be
observed, BU21025GUL may wakeup with a random state. The touch detection and 2-wire serial interface is enabled after
taking the device ready time.
A/D Converter
BU21025GUL has a 12-bit Successive Approximation Resistor (SAR) Analog to Digital (A/D) converter. This A/D converter
is used for measuring X and Y position and Auxiliary input voltage. Output format is in straight binary as shown in Table 5.
Table 5. A/D Convertor Output Format
INPUT VOLTAGE
OUTPUT
(VREF - 1.5LSB) ~ VREF
FFFh
(VREF - 2.5LSB) ~ (VREF - 1.5LSB)
FFEh
(VREF - 3.5LSB) ~ (VREF - 2.5LSB)
FFDh
:
:
1.5LSB ~ 2.5LSB
002h
0.5LSB ~ 1.5LSB
001h
0 ~ 0.5LSB
000h
Note: VREF = VREFP – VREFN, LSB = VREF / 4096
Touch Screen I/F
A touch screen interface is consisted many switches. These switches are used for the driving screen voltage and selection
an input of the A/D converter. State of these switches is selected by a command that sent from the master.


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