XPT2046 查看數據表（PDF） - Unspecified
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XPT2046 Datasheet PDF : 30 Pages
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XPT2046 Touch Screen Controller
Another important consideration for power dissipation is the reference mode of the converter. In the single-ended
reference mode, the touch panel drivers are ON only when the analog input voltage is being acquired (see Figure
12 and Table 1). The external device (e.g., a resistive touch screen), therefore, is only powered during the
acquisition period. In the differential reference mode, the external device must be powered throughout the
acquisition and conversion periods (see Figure 12). If the conversion rate is high, this could substantially increase
power dissipation.CS also puts the XPT2046 into power-down mode. When CS goes high, the XPT2046
immediately goes into power-down mode and does not complete the current conversion. The internal reference,
however, does not turn off with CS going high. To turn the reference off, an additional write is required before CS
goes high (PD1 = 0).When the XPT2046 first powers up, the device draws about 20μA of current until a control
byte is written to it with PD0 = 0 to put it into power-down mode. This can be avoided if the XPT2046 is powered
up with CS = 0 and DCLK = IOVDD.
Demo
P1
IOVCC
R1 R2 R3 R4
J1
Socket
J3
Socket
P5 Header 4
4
3
2
1
ax+ R13
ay+ R15
ax- R16
ay- R17
P4 Header 4
4
3
2
1
ay-
ax-
ay+
ax+
0
0
0
0
C1 C2 C3
104 104 106
J5
Socket
D1
W1
Jumper
+VCC
LED3R22
1K
L1
100uH
C12 104 C13 106
J8
Socket
W2
Jumper
W3
Jumper
W4
Jumper
+VCC U1
Header 6
IOVCC U2
47K 47K47K 47K R5 51
5
VBAT 11
VREF13
IOVCC
IOVC1C4
X+ 6
Y+ 7
X- 8
Y- 9
+VCC
VBAT
VREF
IOVDD
DCLK
CS
DIN
DOUT
BUSY
X+
PENIRQ
Y+
AUX
X-
Y-
GND
TSC2046IRGVR
4DCLK R6
3CS R8
2DIN R10
1 6DOUT R1 1
1BUSY R12
1p5en R14
12AUX
51
51
51
51
51
51
10
20
VCC OE1
OE2
1
19
18
16
14
12
9
7
5
3
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
A1
A2
A3
A4
A5
A6
A7
A8
2
4
6
8
11
13
15
17
R7 51
R9 51
C4 C5 C6 C7
104 104 104 104
P3
4
3
2
1
ay-
ax-
ay+
ax+
J4
Socket
GND 10
SN74LVC244ADB
U3A M74HC07M1R
R18 R19 R20 R21
47K 47K 47K 47K
J6
Header 4
1
2
Socket
IOVCC
P6
1
C9
2
104
C8
104
U3B
R23
3
IOVCC
3
4
U3D
1K C10 104 C11 106
Header 3
9
8
J9
Socket
D2 +VCC
LED3 5
VBAT 11
VREF 13
U4
+VCC
VBAT
VREF
IOVCC14
IOVDD
X+ 6
Y+ 7
X- 8
Y- 9
X+
Y+
X-
Y-
DCLK
CS
DIN
DOUT
BUSY
PENIRQ
AUX
GND
4 DCLK
3 CS
2 DIN
16 DOUT
1 BUSY
15 pen
12 AUX
10
R24
100K
M74HC07M1R
U3C
5
6
IOVCC
M74HC07M1R
J7
C14 104 C15 104
Socket
11
R25 R26 R27
1K 1K 1K
13
M74HC07M1R
U3E
10
M74HC07M1R
U3F
12
M74HC07M1R
TSC2046IRGVR
J2
1
14
2
27
15
3
26
16
4
17
5
18
6
19
7
20
8
21
9
22
10
23
11
24
12
25
13
D Connector25
Figure 19. Demo
Copyright©2007, SHENZHEN XPTEK TECHNOLOGY CO.,LTD http://www.xptek.com.cn
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