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BU21025GUL データシート(PDF) 7 Page - Rohm

部品番号 BU21025GUL
部品情報  4-wire Resistive Touch Screen Controller
Download  19 Pages
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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) 7 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
7/15
Datasheet
Datasheet
Write Protocol
An command write is started in BU21025GUL when the master sends the start condition, the slave address of
BU21025GUL, and zero in bit 0( 8
th bit) for writing, as shown in Table 1. If the slave address is matched with its own,
BU21025GUL issues an acknowledge to the master. When the master receives the acknowledge from BU21025GUL, the
master send the command byte. When BU21025GUL received next 8 bits, it issues another acknowledge to the master.
After the acknowledge is received by the master, the master sends the stop or repeated start condition for ending write.
Figure 1. Write Protocol
If a receiving command in BU21025GUL is not the software reset or setup, BU21025GUL starts driving screen voltage
when C0 is latched by rising edge of SCL. Next, if the received type of operation code is measurement, BU21025GUL starts
acquisition in A/D converter when next falling edge of SCL. BU21025GUL stops acquisition and starts A/D conversion when
BU21025GUL receive the stop or repeated start condition.
When BU21025GUL receives a command other than software reset during the A/D conversion, the command is ignored.
And if the command is ignored, BU21025GUL doesn’t return an acknowledge at the ACK timing behind the command byte.
(18
th timing in Figure. 1)


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