AK4184 Datasheet, PDF (4/36 Pages) Asahi Kasei Microsystems – TSC with Keypad Scanner and GPIO Expander

[AK4184]
No. Pin Name
A1 NC
B1 KEYIRQN
C2 BUSY
C1 DOUT
D2 DIN
D1 SCLK
E2 CSN
E1 RESETN
F2 PENIRQN
G1 NC
F1 VSS1
G2 YN
F3 XN
G3 YP
F4 XP
G4 AVDD
PIN/FUNCTION
I/O
Function
- No Connection
No internal bonding. This pin should be open or connected to the ground.
O Keypad Interrupt (Active Low)
This pin is “L” on a key press (when the AK4184 is allowed to detect a key press). This
pin is “H” after a debounce scan is completed. This is always “H” when the device is in
key interrupt disable state.
O BUSY output
Keypad scanner: This pin stays “H” when the keypad scanner is on the debounce scan.
Touch Screen controller: This pin stays “H” from the end of sampling time to the timing
of the MSB data out.
O Serial Data Output
Data is clocked at SCLK falling edge. DOUT pin is “L” when this part does not produce
data at the CSN=“L”. This pin is Hi-Z when CSN keeps “H”
I Serial Data Input
Data is clocked on the rising edge of SCLK. Must keep “L” while not issuing command.
I External Clock Input
I Chip Select Input (Active Low)
Enables writing data to registers when CSN pin = “L”
I Device Reset (Active Low)
O Pen Interrupt Output (Active Low)
PENIRQN pin is “L” when touch-screen pressed is detected and the CSN pin is “H”.
This pin is “H” irrespective of touch screen press when pen interrupt is not enabled. The
state is dependent upon power down mode. See „ Power-down control and „ Pen
Interrupt for reference.
- No Connection
No internal bonding. This pin should be open or connected to the ground.
- Analog Ground
I/O Touch Screen Y- plate Voltage Supply
„ Y axis measurement: Supplies voltage to the Y- position input
„ X axis measurement: OPEN state
„ Pen Pressure Measurement: This pin is the input for the A/D converter for Z2
measurement.
„ Pen Waiting State: connected to GND.
I/O Touch Screen X- plate Voltage Supply
„ X axis measurement: Supplies voltage to the X- position input
„ Y axis measurement: OPEN state
„ Pen Pressure Measurement: Supplies the voltage to X- position input of the touch
panel
„ Pen Waiting State: OPEN state
I/O Touch Screen Y+ plate Voltage Supply
„ X axis measurement: Supplies voltage to the X- position input
„ Y axis measurement: OPEN state
„ Pen Pressure measurement voltage supply
„ Pen Waiting State: OPEN state
I/O Touch Screen X+ plate Voltage Supply
„ X axis measurement: Supplies voltage to the X+ position input
„ Y axis measurement: This pin is used for the input to the A/D converter
„ Pen Pressure measurement: This pin is the input for the A/D converter for Z1
measurement.
„ Pen Waiting State: Pulled up by an internal resistor (typ.50KΩ).
- Analog Power Supply 2.5V ~ 3.6V
MS0603-E-00
4
2007/04