BU21028FV-M Datasheet, PDF (18/36 Pages) Rohm – 4-wire Resistive Touch Screen Controller

BU21028FV-M
Sensing timing chart (Auto mode)
HOST
INT
SCAN XYZ
(CF=0x0)
BU21029
Detecting
touch
Z1 coordinate
tConv4
Sample and Conversion
Z2 coordinate
X coordinate
Y coordinate
tINTVL
Wait (INTVL_TIME)
Figure 8. Touch screen scan flow 3 (XYZ scan)
tPON
= 710us
tDLY1
= 1.5us
tADC
= 18us
tDLY2
= 1.0us
tTIME_ST_ADC = register (addr.0x2)
tINTVL
= register (addr.0x2)
tSMPL
= register (addr.0x1)
tConv4
= tPON + tDLY1 + (tTIME_ST_ADC + (tADC * tSMPL) * 2 + tDLY2) * 3
(*1) Time is calculated with the oscillating frequency of the internal OSC is 8MHz.
(*2) In the case of PDM=1, every tPON(s) is zero except for the first one.
(*3) The order of taking each touch data, etc. cannot be changed.
Read
result of SCAN XYZ
Sample and Conversion
Z1 coordinate Z2.
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TSZ02201-0L5L0F300720-1-2
27.May.2016 Rev.002