MAX1233ETI+T Maxim Integrated Products, MAX1233ETI+T Datasheet - Page 20

• Manufacturer Part Number: MAX1233ETI+T
• Description: IC CNTRLR TOUCH 28-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Resistiver

Specifications of MAX1233ETI+T

• Touch Panel Interface: 4-Wire
• Number Of Inputs/keys: 1, 4 x 4 Keypad
• Resolution (bits): 8, 10, 12 b
• Data Interface: MICROWIRE™, QSPI™, Serial, SPI™
• Data Rate/sampling Rate (sps, Bps): 50k
• Voltage Reference: External, Internal
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Applications: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
In order to read the entire first page of memory, for
example, the host processor must send the
MAX1233/MAX1234 the command 0x8000
MAX1233/MAX1234 then begin clocking out 16-bit data
starting with the X-data register. In order to write to the
second page of memory, the host processor sends the
MAX1233/MAX1234 the command 0x0040
ceeding data is then written in 16-bit words beginning
with the ADC control register. Figures 10a and 10b show
a complete write and read operation, respectively,
between the processor and the MAX1233/MAX1234.
Figure 10a. Timing Diagram of Write Operation
Figure 10b. Timing Diagram of Read Operation
Table 4. ADC Control Register (Write 0x0040/Read 0x8040)
20
PENSTS
BIT15
______________________________________________________________________________________
DOUT
SCLK
DOUT
SCLK
TIMING NOT TO SCALE.
THREE-STATE
DIN
DIN
CS
CS
D15 IS READ/WRITE BIT
ADSTS
BIT14
LOW FOR WRITE
THREE-
STATE
D15 D14
D15
BIT13 BIT12 BIT11 BIT10
A/D3
D15–D0 COMMAND
WORD
A/D2
D15–D0 COMMAND WORD
A/D1
A/D0
D0
H
. The suc-
D15
RES1
BIT9
H
. The
READ OPERATION
WRITE OPERATION
RES0
DATA WORD
BIT8
D0
The MAX1233/MAX1234s’ internal memory is divided
into two pages—one for data and one for control, each
of which contains thirty-two 16-bit registers.
Table 3 provides a summary of all registers and bit
locations of the MAX1233/MAX1234.
The ADC measures touch position, touch pressure, bat-
tery voltage, auxiliary analog inputs, and temperature.
The ADC control register determines which input is
selected and converted. Tables 4 and 5 show the for-
mat and bit descriptions for the ADC control register.
AVG1 AVG0 CNR1 CNR0
BIT7
D15
BIT6
D0
D15–D0 DATA WORD
BIT5
D15
BIT4
DATA WORD
BIT3
ST2
ADC Control Register
Control Registers
BIT2
ST1
D0
THREE-
STATE
D0
Memory Map
BIT1
ST0
THREE-STATE
BIT0
RFV