BU21029MUV Datasheet, PDF (20/29 Pages) Rohm – 4-wire Resistive Touch Screen Controller

BU21029MUV
Datasheet
Table 17. EVR Register (PAGE=0, ADDR=0x3 to 0x5, Reset value=0x10)
D7
D6
D5
D4
D3
D2
D1
D0
EVR_*[7:0]
Bits D7-D0: EVR_*
This is gain setting 1 for dual touch detection. When using 2-point detection function, it is necessary to set this before
conversion. It corresponds to X, Y and XY (Z). It is not necessary to change EVR_XY from initial value.
Table 18. PIMIR Register (PAGE=0, ADDR=0x9 to 0xA, Reset value=0x0F)
D7
D6
D5
D4
D3
D2
D1
D0
-
-
-
PIMIR_*[4:0]
Bits D4-D0: PIMIR_*
This is gain setting 2 for dual touch detection. It is not necessary to change this from the initial value.
It corresponds to X and Y.
Table 19. CFR3 Register (PAGE=0, ADDR=0xB, Reset value=0x72)
D7
D6
D5
D4
D3
D2
D1
D0
RM8 STRETCH PU90K DUAL
PIDAC_OFS[3:0]
Bit D7: RM8
Coordinate resolution setting
0= 12bit
1= 8bit
Bit D6: STRETCH
SCL_STRETCH function setting
0= off
1= on
Bit D5 : PU90K
Internal pull-up resistance for touch detection setting
0= about 50kΩ
1= about 90kΩ
Bit D4: DUAL
Dual touch detection function setting
0= Off
1= On
Bits D3-D0: PIDAC_OFS
Dual touch detection circuit adjustment setting. It is not necessary to change this from initial value.
Table 20. LDO Register (PAGE=0, ADDR=0xC, Reset value=0x00)
D7
D6
D5
D4
D3
D2
D1
D0
-
PVDD[2:0]
-
AVDD[2:0]
Bits D6-D4: PVDD
Regulator for panel output setting.
By increasing voltage, influence of exogenous noise from the panel interface is reduced.
Table 21. PVDD setting
value output
0
1.500V
1
1.556V
2
1.615V
3
1.680V
4
1.750V
5
1.826V
6
1.909V
7
2.000V
Bits D2-D0: AVDD
The output voltage setting of the analog circuit regulator
The relationship of setting value and output voltage is same as PVDD.
It is not possible to change from the initial value when VDD or PVDD is lower than 2.5V.
www.rohm.co.jp
© 2011 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
20/26
TSZ02201-0Y1Y0F300110-1-2
11.Nov.2013 Rev.004