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BU21026MUV-E2 Datenblatt(PDF) 4 Page - Rohm

Teilenummer BU21026MUV-E2
Bauteilbeschribung  4-wire Resistive Touch Screen Controller
Download  23 Pages
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Hersteller  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BU21026MUV-E2 Datenblatt(HTML) 4 Page - Rohm

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TSZ02201-0L5L0FF00890-1-2
© 2016 ROHM Co., Ltd. All rights reserved.
4.Aug.2016 Rev.001
www.rohm.com
TSZ22111 • 15 • 001
BU21026MUV
Block Diagram(s)
Touch Screen
Interface
Clock
Oscillator
A/D
Converter
Control
Logic
&
2-wire Serial
Interface
INT
Digital Filter
Touch
Detection
SDA
SCL
AD1
AD0
Power On
Reset
XP
YP
XN
YN
AUX
VDD
GND
Description of Block(s)
Power on Reset
BU21026MUV requests that the Power on Reset Timing should be observed. If the Power on Reset Timing not be observed,
BU21026MUV 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
BU21026MUV 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 below
table.
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 / 4095
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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