BU21049GUL Datasheet, PDF (14/26 Pages) Rohm – 4-wire Resistive Touch Screen Controller

BU21049GUL
Datasheet
Touch screen scan flow 1 (X and Y scan)
Turn On
HOST
X+ and X-
Drivers
(CF=0x8)
INT
BU21049
Detecting
touch
SCAN X
(CF=0xC)
Waiting for
scan command
tConv1
Sample and Conversion
for X coordinate
Read
result of
SCAN X
Turn On
Y+ and Y-
Drivers
(CF=0x9)
SCAN Y
(CF=0xD)
tConv1
Detecting
touch
Waiting for Sample and Conversion
scan command
for Y coordinate
Read
result of
SCAN Y
Detecting
touch
Touch screen scan flow 2 (Z1 and Z2 scan)
Turn On
HOST
X+ and Y-
Drivers
(CF=0xA)
INT
BU21049
Detecting
touch
SCAN Z
(CF=0xE)
tConv1
Waiting for Sample and Conversion
scan command
for Z1 coordinate
tConv2
Sample and Conversion
for Z2 coordinate
Read
result of
SCAN Z1
Read
result of
SCAN Z2
Detecting
touch
tPON = 710us
tDLY1 = 1.5us
tADC = 18us
tDLY2 = 1.0us
tTIME_ST_ADC = register (addr.0x2)
tSMPL = register (addr.0x1)
tConv1 = tPON + tDLY1 + (tTIME_ST_ADC + (tADC * tSMPL) + tDLY2)
tConv2 = tDLY1 + (tADC * tSMPL) + tDLY2
(*1) Time is calculated with the oscillating frequency of the internal OSC is 8MHz.
(*2) In the case of PDM=1, tPON(s) is set to zero except for the first time.
(*3) A dashed line part is required only when set apply time to a panel more than tTIME_ST_ADC.
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TSZ22111・15・001
14/23
TSZ02201-0Y1Y0F300010-1-2
31.JAN.2012 Rev.001