MAX1233ETI+ Maxim Integrated Products, MAX1233ETI+ Datasheet - Page 37
![IC CNTRLR TOUCH 28-TQFN](/photos/6/61/66150/28-tqfn_21-0139h_sml.jpg)
MAX1233ETI+
Manufacturer Part Number
MAX1233ETI+
Description
IC CNTRLR TOUCH 28-TQFN
Manufacturer
Maxim Integrated Products
Type
Resistiver
Datasheet
1.MAX1234ETIT.pdf
(44 pages)
Specifications of MAX1233ETI+
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
Figure 22. Touch-Initiated X- , Y-, and Z- Coordinate Screen Scan
Controllers Include DAC and Keypad Controller
YES
NO
NO
______________________________________________________________________________________
CONVERT X- COORDINATES
TURN ON DRIVERS: Y+, Y-
IS TOUCH-SCREEN
AVERAGING DONE?
SETTLING DONE?
POWER UP ADC
UNREAD SCAN
SET BUSY LOW
START CLOCK
PENIRQ LOW
ARE THERE
IS PENSTS
RESULTS?
SCREEN
BIT = 1?
IS DATA
TOUCH
SET
±15kV ESD-Protected Touch-Screen
NO
YES
YES
HOST-INITIATED
(FIGURE 24)
GO TO
SCAN
X, Y, AND Z SCREEN SCAN
PENIRQ-INITIATED
NO
NO
NO
STORE Y- COORDINATES IN
CONVERT Y- COORDINATES
TURN ON DRIVERS: Y+, X-
TURN ON DRIVERS: X+, X-
STORE X- COORDINATES
POWER DOWN ADC
IS TOUCH-SCREEN
AVERAGING DONE?
POWER DOWN ADC
IS TOUCH-SCREEN
SETTLING DONE?
SETTLING DONE?
POWER UP ADC
IN X- REGISTER
POWER UP ADC
Y- REGISTER
IS DATA
YES
YES
YES
NO
NO
CONVERT Z
CONVERT Z
STORE Z
STORE Z
RESET PENIRQ HIGH
AVERAGING DONE?
AVERAGING DONE?
TURN OFF CLOCK
IN Z
IN Z
SET BUSY HIGH
POWER UP ADC
1
1
2
2
IS DATA
IS DATA
- COORDINATES
- REGISTER
- COORDINATES
- REGISTER
DONE
1
2
- COORDINATES
COORDINATES
YES
YES
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