BU21049GUL Datasheet, PDF (18/26 Pages) Rohm – 4-wire Resistive Touch Screen Controller

BU21049GUL
Datasheet
●Register description
PAGE=0, ADDR=0x0
D7
D6
D5
RSV0 RSV0 CALIB
Bits D7-D6, D3-D0: RSV0
Reserved. Set 0 these bits.
D4
INTRM
D3
RSV0
D2
RSV0
D1
RSV0
D0
RSV0
Bit D5 : CALIB
Internal parameter setting-1 for calibration of dual touch detection
0= NOT use calibration result
1= Use calibration result
Bit D4 : INTRM
Setting of INT states in case that BU21049GUL is active after convert operation by “PDM” setting.
0= depend on “pen-down”
1= always output “0”
PAGE=0, ADDR=0x1 : CFR1
D7
D6
D5
D4
D3
D2
D1
D0
MAV
AVE
-
SMPL
Bit D7: MAV
Median Average Filter
0= Off
1= On
Bits D6-D4: AVE
AVE+1= The number of average samples setting for MAV. If AVE more than SMPL, it is even out SMPL.
Bits D2-D0: SMPL
SMPL+1= The number of conversion samples setting for MAV.
Ex. In the case of CFR1 = 0xA6 (the number of average samples is 3 and the number of conversion samples is 7)
Conversion result
{ 1676, 1688, 1656, 1677, 1659, 1702, 4095 }
Sorted result
{ 1656, 1659, 1676, 1677, 1688, 1702, 4095 }
Chose 3 center data
{ 1656, 1659, 1676, 1677, 1688, 1702, 4095 }
Average above 3 data = ( 1676 + 1677 + 1688 ) / 3 =1680 (vs averaged all six data = 2022)
www.rohm.co
© 2011 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
18/23
TSZ02201-0Y1Y0F300010-1-2
31.JAN.2012 Rev.001