MAX7359 Maxim, MAX7359 Datasheet - Page 18

• Manufacturer Part Number: MAX7359
• Description: The MAX7359 I²C interfaced peripheral provides microprocessors with management of up to 64 key switches
• Manufacturer: Maxim

2-Wire Interfaced Low-EMI
Key Switch Controller/GPO
Figure 9. Ghost-Key Phenomenon
18
______________________________________________________________________________________
+3.3V
GND
+5V
V
µC
CC
SDA
SCL
INT
+3.3V
KEY-SWITCH MATRIX
+1.8V
REGULAR KEY-PRESS
EVENT
V
COL6/PORT6
COL7/PORT7
AD0
SCL
SDA
INT
CC
MAX7359
GND
GHOST-KEY
EVENT
COL5/PORT5
COL4/PORT4
COL3/PORT3
COL2/PORT2
ROW0
ROW1
ROW2
ROW3
ROW4
ROW5
ROW6
ROW7
COL1
COL0
Typical Application Circuits (continued)
Figure 10. Valid Three-Key Combinations
KEY 1
KEY 0
KEY 2
KEY 3
KEY 4
KEY 5
KEY 6
KEY 7
KEY-SWITCH MATRIX
KEY 10
KEY 11
KEY 12
KEY 13
KEY 14
KEY 15
KEY 8
KEY 9
EXAMPLES OF VALID THREE-KEY COMBINATIONS
KEY 16
KEY 17
KEY 18
KEY 19
KEY 20
KEY 21
KEY 22
KEY 23
KEY 24
KEY 25
KEY 26
KEY 27
KEY 28
KEY 29
KEY 30
KEY 31
KEY-SWITCH MATRIX
KEY 32
KEY 33
KEY 34
KEY 35
KEY 36
KEY 37
KEY 38
KEY 39
KEY 40
KEY 41
KEY 42
KEY 43
KEY 44
KEY 45
KEY 46
KEY 47