MAX1234ETI+T Maxim Integrated Products, MAX1234ETI+T Datasheet - Page 39

• 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

Figure 24. Host-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-
STORE X- COORDINATES
CONTROL REGISTER
AVERAGING DONE?
POWER DOWN ADC
IS TOUCH-SCREEN
±15kV ESD-Protected Touch-Screen
SETTLING DONE?
POWER UP ADC
UNREAD SCAN
SET BUSY LOW
IN X- REGISTER
HOST WRITES
START CLOCK
PENIRQ LOW
ARE THERE
IS PENSTS
RESULTS?
SCREEN
BIT = 1?
IS DATA
TOUCH
ADC
SET
NO
NO
YES
YES
YES
TOUCH-INITIATED
(FIGURE 22)
GO TO
SCAN
X-, Y-, AND Z- SCREEN SCAN
HOST-INITIATED
NO
NO
STORE Y- COORDINATES IN
CONVERT Y- COORDINATES
TURN ON DRIVERS: X+, X-
IS TOUCH-SCREEN
AVERAGING DONE?
POWER DOWN ADC
SETTLING DONE?
POWER UP ADC
Y- REGISTER
IS DATA
YES
YES
NO
NO
NO
CONVERT Z
CONVERT Z
TURN ON DRIVERS: Y+, X-
STORE Z
STORE Z
RESET PENIRQ HIGH
POWER DOWN ADC
IS TOUCH-SCREEN
AVERAGING DONE?
AVERAGING DONE?
TURN OFF CLOCK
SETTLING DONE?
IIN Z
IN Z
SET BUSY HIGH
POWER UP ADC
1
2
1
IS DATA
IS DATA
2
- COORDINATES
- REGISTER
- COORDINATES
- REGISTER
2
DONE
1
- COORDINATES
- COORDINATES
YES
YES
YES
39