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±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
PENIRQ returns high only after a touch-screen scan is
completed. PENIRQ does not go low again until one of
the touch-screen data registers is read. Figures 8a and
8b show the timing diagrams for the PENIRQ pin.
Keypad Interrupt Request ( KEYIRQ )
The KEYIRQ output can be used to alert the host con-
troller of a key press. The KEYIRQ output is normally
high and goes low after a key press is detected.
KEYIRQ returns high only after a key-press scan is
completed. KEYIRQ does not go low again until one of
R_
KEYIRQ
BUSY
the key-press data registers is read. Figures 9a and 9b
show the timing diagrams for the KEYIRQ pin.
Busy Indicator ( BUSY )
BUSY informs the host processor that a scan is in
progress. BUSY is normally high and goes low and
stays low during each functional operation. The host
controller should wait until BUSY is high again before
CS
DOUT
DATA
READ
TOUCH-
SCREEN
DATA
using the serial interface.
Digital Interface
The MAX1233/MAX1234 interface to the host controller
through a standard 3-wire serial interface at up to
10MHz. DIN and CS are the digital inputs to the
MAX1233/MAX1234. DOUT is the serial data output.
Data is clocked out at the SCLK falling edge and is
high impedance when CS is high. When performing an
ADC scan, CS must de-assert high before the end of
the first conversion, otherwise the conversion results
Figure 9a. Timing Diagram for Key-Press-Initiated Debounce
Scan
R_
KEYIRQ
BUSY
will not be stored. PENIRQ and KEYIRQ communicate
interrupts from the touch-screen and keypad controllers
to the host processor when a screen touch or a key
press is detected. BUSY informs the host processor that
a scan is in progress. In addition to these digital I/Os, the
row and column pins of the keypad controller can be
programmed as GPIO pins.
CS
DIN
DOUT
DATA
READ
TOUCH-
SCREEN
Communications Protocol
The MAX1233/MAX1234 are controlled by reading from
and writing to registers through the 3-wire serial inter-
face. These registers are addressed through a 16-bit
command that is sent prior to the data. The command
is shown in Table 2.
The first 16 bits after the falling edge of CS contain the
command word. The command word begins with an
R/ W bit, which specifies the direction of data flow on
the serial bus. Bits 14 through 7 are reserved for future
use. Bit 6 specifies the page of memory in which the
Table 2. Command Word Format
DATA
Figure 9b. Timing Diagram for Host-Initiated Keypad
Debounce Scan
desired register is located. The last 6 bits specify the
address of the desired register. The next 16 bits of data
are read from or written to the address specified in the
command word. After 32 clock cycles, the interface
automatically increments its address pointer and con-
tinues reading or writing until the rising edge of CS , or
until it reaches the end of the page.
BIT15
MSB
R/ W
BIT14
RES
BIT13
RES
BIT12
RES
BIT11
RES
BIT10
RES
BIT9
RES
BIT8
RES
BIT7
RES
BIT6
PAGE
BIT5
ADD5
BIT4
ADD4
BIT3
ADD3
BIT2
ADD2
BIT1
ADD1
BIT0
LSB
ADD0
18
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