BU21028FV-M Datasheet, PDF (25/36 Pages) Rohm – 4-wire Resistive Touch Screen Controller

BU21028FV-M
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
-
RSV1 RSV0 RSV0
-
RSV1
Bit D6 : RSV1
Bit D5-D4 : RSV0
Bit D2 : RSV1
Bit D1-D0 : RSV0
D1
RSV0
D0
RSV0
Please set 44h at initialize register in the power on sequence flow chart.
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TSZ02201-0L5L0F300720-1-2
27.May.2016 Rev.002