AK4180 Datasheet, PDF (3/17 Pages) Asahi Kasei Microsystems – Touch Screen Controller

[ASAHI KASEI]
[AK4180]
No.
Signal Name
1 VCC
2 XP
3 YP
4 XN
5 YN
6 GND
7 VBAT
8 IN1
9 VREF
10 IN2
11 PENIRQN
12 DOUT
13 BUSY
14 DIN
15 CSN
16 DCLK
Pin/Function
I/O
Description
- Power Supply
I/O Touch Screen X+ plate Voltage supply
„ X axis Measurement: Supplies the voltage
„ Y axis Measurement: This pin is used as the input for the A/D converter
„ Pen Pressure Measurement: This pin is the input to the A/D converter at Z1 measurement.
„ Temperature/VBAT/IN1/IN2 Measurement: OPEN state
„ Powerdown State: is pulled up by an internal resistor (typ.20k ohm).
I/O Touch Screen Y+ plate Voltage supply
„ Y axis Measurement: Supplies the voltage
„ X axis Measurement: This pin is used as the input for the A/D converter
„ Pen Pressure Measurement: Supplies the voltage.
„ Temperature/VBAT/IN1/IN2 Measurement: OPEN state
„ Powerdown State: OPEN state.
I/O Touch Screen X- plate Voltage supply
„ X axis Measurement: Supplies the voltage
„ Y axis Measurement: OPEN state
„ Pen Pressure Measurement: Supplies the voltage.
„ Temperature/VBAT/IN1/IN2 Measurement: OPEN state
„ Powerdown State: OPEN state
I/O Touch Screen Y- plate Voltage supply
„ Y axis Measurement: Supplies the voltage
„ X axis Measurement: OPEN state
„ Pen Pressure Measurement: This pin is the input to the A/D converter at Z2 measurement.
„ Temperature/VBAT/IN1/IN2 Measurement: OPEN state
„ Powerdown State: connected to GND.
- Ground
I Analog Input for Battery Monitor
I Auxiliary 1 Analog Input
I/O Voltage Reference Input/Output
Outputs 2.5V
I Auxiliary 2 Analog Input
O Pen Interrupt Output
This pin should be pulled up via a 100k-ohm resistor.
O Serial A/D Data Output
Outputs A/D data serially at the falling edge of DCLK. MSB is output at the falling edge of
BUSY signal.
DOUT is “L” at CSN=”L” except that A/D data is output.
This pin is Hi-Z state at CSN=”H”
O BUSY Output
This pin goes to low at CSN = “L”. BUSY signal is “H” only for the period between the falling
edge of 8DCLK and the falling edge of 9DCLK.
This pin is Hi-Z state at CSN=”H”
I Serial Data Input
Inputs 8-bit control command data serially when CSN=”L”
AK4180 latches at the rising edge of DCLK. Please keep “L” except when issuing commands.
I Chip Select Input
Enables writing to the registers when CSN=”L”. CSN=”H” and DIN=”H” force the internal
registers to initial value, 00h. (Full Powerdown)
I External Clock Input
<MS0195-E-01>
3
2003/02