MAX1233ETI+ Maxim Integrated Products, MAX1233ETI+ Datasheet - Page 40
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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
±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
Figure 25. Key-Press-Initiated Debounce Scan
40
______________________________________________________________________________________
YES
KEY-PRESS-INITIATED DEBOUNCE SCAN
SCAN AND DEBOUNCE KEYS
RESULTS IN REGISTER
STORE KEYPAD SCAN
UNREAD DEBOUNCE
RESET KEYIRQ HIGH
IS KEYSTS1 = 1?
SET BUSY HIGH
SET BUSY LOW
START CLOCK
KEYIRQ LOW
ARE THERE
RESULTS?
KEYPAD
TOUCH
DONE
SET
NO
YES
NO
GO TO HOST-INITIATED
DEBOUNCE SCAN
Figure 26. Host-Initiated Debounce Scan
YES
HOST-INITIATED DEBOUNCE SCAN
SCAN AND DEBOUNCE KEYS
RESULTS IN REGISTER
STORE KEYPAD SCAN
UNREAD DEBOUNCE
CONTROL REGISTER
RESET KEYIRQ HIGH
IS KEYSTS1 = 1?
SET BUSY HIGH
SET BUSY LOW
HOST WRITES
START CLOCK
KEYIRQ LOW
ARE THERE
RESULTS?
KEYPAD
TOUCH
DONE
ADC
SET
NO
NO
YES
GO TO KEY-PRESS-INITIATED
DEBOUNCE SCAN