AK4185 AKM [Asahi Kasei Microsystems], AK4185 Datasheet - Page 24

• Manufacturer Part Number: AK4185
• Manufacturer: AKM [Asahi Kasei Microsystems]

Figure
demonstrates the optimum layout, power supply arrangements and measurement results.
<4-wire Touch Screen Input>
MS0954-E-00
24,
Notes:
Figure 25
- The DOUT pin is floating except when communicating with the micro-controller. Therefore, a pull-up or
- VSS of the AK4185 should be distributed separately from the ground of external controllers.
- All digital input pins (CSN, SCLK, DIN pins) must not be left floating.
Analog Supply
pull-down resistor around 100kΩ must be connected to the DOUT pin of the AK4185.
Auxiliary Analog Input
1.6∼3.6V
shows the system connection diagram for the AK4185. The evaluation board [AKD4185]
10µ
+
Figure 24. Typical Connection Diagram
0.1µ
SYSTEM DESIGN
VDD
XP
IN
PENIRQN
Touch Screen
- 24 -
Top View
CSN
YP
4-wire
DOUT
DIN
XN
SCLK
VSS
YN
Analog Ground
0.01µ *
0.01µ *
0.01µ *
0.01µ *
Digital Ground
µP
[AK4185]
2008/05