BU21028FV-M Datasheet, PDF (19/36 Pages) Rohm – 4-wire Resistive Touch Screen Controller

BU21028FV-M
Calibration sequence flow chart
From main
Count = Count + 1
White box: Control flow
Charcoal gray box: Divergence by the use function
Light gray box: For periodic calibration
Count > 9
No
Yes
Check user interface on system
Use 2-points
operation
Use only 1 point touch or
Unknown
Enable interrupt MASK on HOST
Send STOP command
(STP = 1)
Send calibration command
(CF = 0x5)
Wait for finish calibration by below way
・Check INT pin
・Check register(CALIB_DONE)
(page=0, addr.=0x0D bit1)
・Wait for more than 10ms
Use Auto mode
No
Yes
Send scan_XYZ command
(CF = 0x0)
Return main
(Note) It is not essential about the “Check user interface”. Please carry it out as needed.
(Note) Please adjust the threshold of Count (“Count > 9” above flowchart) depending on a period of periodic calibration.
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TSZ02201-0L5L0F300720-1-2
27.May.2016 Rev.002