MAX1234ETI+T Maxim Integrated Products, MAX1234ETI+T Datasheet - Page 36

• Manufacturer Part Number: MAX1234ETI+T
• Description: IC CNTRLR TOUCH 28-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Resistiver

Specifications of MAX1234ETI+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: Internal
• Voltage - Supply: 4.75 V ~ 5.25 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
Figure 21. Touch-Initiated X- and Y- Coordinate Screen Scan
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YES
NO
NO
CONVERT X- COORDINATES
TURN ON DRIVERS: Y+, Y-
STORE X- COORDINATES
IS TOUCH-SCREEN
AVERAGING DONE?
SETTLING DONE?
POWER UP ADC
IN X- REGISTER
UNREAD SCAN
SET BUSY LOW
START CLOCK
PENIRQ LOW
ARE THERE
IS PENSTS
RESULTS?
SCREEN
BIT = 1?
IS DATA
TOUCH
SET
NO
YES
YES
YES
NO
X- AND Y- SCREEN SCAN
PENIRQ-INITIATED
HOST-INITIATED
(FIGURE 23)
GO TO
SCAN
NO
NO
CONVERT Y- COORDINATES
STORE Y- COORDINATES IN
TURN ON DRIVERS: X+. X-
RESET PENIRQ HIGH
AVERAGING DONE?
POWER DOWN ADC
IS TOUCH-SCREEN
SETTLING DONE?
TURN OFF CLOCK
POWER UP ADC
SET BUSY HIGH
POWER DOWN
Y- REGISTER
IS DATA
DONE
ADC
YES
YES