BU21021GUL Datasheet, PDF (9/13 Pages) Rohm – 4-wire resistive Touch Screen Controller

BU21021GUL
●Typical Application circuit
BU21021GUL has two selectable host interfaces (4-wire SPI and 2-wire serial).
The figure below shows the example of circuit when each interface is used.
(Show by the terminal display though BU21021GUL is CSP package.)
Option(*1)
Option(*2)
Option(*3)
For reject and reduce the noise from touch screen / LCD module or wiring.
It is not necessary to mount EEPROM when firmware download setting is host.
Connect to ECL/EDA to VSS.
Please connect EEPROM when firmware download setting is EEPROM.
In using with Slave address = BAh case, connect SEL_CSB to VDD.
Datasheet
Figure 8. Application circuit 1 (4-wire SPI)
Figure 9. Application circuit 2 (2-wire serial bus)
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
9/10
TSZ02201-0Y1Y0F300060-1-2
19.Jun.2012 Rev.001