Datasheet

Keypad
Control
Control
Registers
and FIFO
Oscillator
(32 kHz)
Power-On
Reset
SDA
SCL
I C Bus
Control
2
RESET
INT
Interrupt
Control
V
CC
ROW0 COL9–
TCA8418E
www.ti.com SCPS222B –MAY 2010–REVISED SEPTEMBER 2010
SWITCHING CHARACTERISTICS
STANDARD MODE,
FAST MODE, FAST
MODE PLUS (FM+)
PARAMETER FROM TO UNIT
I
2
C BUS
MIN MAX
Key event or Key
20 60
unlock or Overflow
GPI_INT with
INT 40 120
ROW0–7,
Debounce_DIS_Low
t
IV
Interrupt valid time ms
COL0–9
GPI_INT with
10 30
Debounce_DIS_High
CAD_INT INT, CAD_INT 20 60
SCL INT
t
IR
Interrupt reset delay time 200 ns
SCL CAD_INT
ROW0–7,
t
PV
Output data valid SCL 400 ns
COL0–9
t
PS
Input data setup time P port SCL 0 ns
t
PH
Input data hold time P port SCL 300 ns
KEYPAD SWITCHING CHARACTERISTICS
STANDARD MODE, FAST MODE, FAST
MODE PLUS (FM+)
PARAMETER UNIT
I
2
C BUS
MIN MAX
Key press to detection delay 25 ms
Key release to detection delay 25 ms
Keypad unlock timer 7 s
Keypad interrupt mask timer 31 s
Debounce 60 ms
LOGIC DIAGRAM (POSITIVE LOGIC)
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