MAX1234ETI+T Maxim Integrated Products, MAX1234ETI+T Datasheet - Page 24

• 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
Table 17. Keypad Control Register (Write 0x0041/Read 0x8041)
Table 18. Keypad Control Register Bit Descriptions (Write 0x0041/Read 0x8041)
Table 19. KEYSTS1/KEYSTS0 Functions
Table 20. Keypad Debounce Time Control
24
DBN2
KEYSTS1
KEYSTS1
15 (MSB)
BIT15
0
0
0
0
1
1
1
1
[7:0]
______________________________________________________________________________________
BIT
14
13
12
11
10
0
1
0
1
9
8
DBN1
0
0
1
1
0
0
1
1
KEYSTS0 DBN2
BIT14
KEYSTS0
KEYSTS1
KEYSTS0
DBN0
NAME
DBN2
DBN1
DBN0
HLD2
HLD1
HLD0
0
1
0
1
0
1
0
1
0
0
0
1
1
BIT13
Debounce time: 2
Debounce time: 10
Debounce time: 20
Debounce time: 50
Debounce time: 60
Debounce time: 80
Debounce time: 100
Debounce time: 120
Read: keypad interrupt status; Write: set interrupt initiated keypad scans
Read: keypad scan status; Write: stop keypad scan
Keypad debounce time control
Keypad debounce time control
Keypad debounce time control
Keypad hold time control
Keypad hold time control
Keypad hold time control
Reserved
No button press detected;
scan or debounce in progress
Button press detected;
scan or debounce in progress
No button press detected;
data available
Button press detected;
data available
BIT12
DBN1
FUNCTION (ms)
READ FUNCTION
BIT11
DBN0
BIT10
HLD2
HLD
BIT9
Scans keypad once and waits to detect a button press. Upon
detection, issues an interrupt and waits for the host’s instruction
before scanning.
Stops any ongoing scan and waits to detect a button press. Upon
detection, issues an interrupt and scans the keypad.
Stops any ongoing scan and waits to detect a button press. Upon
detection, issues an interrupt and waits for the host’s instruction
before scanning.
Stops any ongoing scan and powers down the button press
detection circuit. No button presses are detected in this mode.
HLD
BIT8
DESCRIPTION
BIT7
0
BIT6
0
WRITE FUNCTION
BIT5
0
BIT4
0
BIT3
0
BIT2
0
BIT1
0
BIT0
0