TCA8418 Datasheet, PDF (7/37 Pages) Texas Instruments – I2C CONTROLLED KEYPAD SCAN IC WITH INTEGRATED ESD PROTECTION

TCA8418
www.ti.com ......................................................................................................................................................................................... SCPS215 – SEPTEMBER 2009
SWITCHING CHARACTERISTICS
PARAMETER
t_IV
Interrupt valid time
t_IR
Interrupt reset delay time
t_PV
Output data valid
t_PS
Input data setup time
t_PH
Input data hold time
Key event or Key
unlock or Overflow
GPI_INT with
Debounce_DIS_Low
GPI_INT with
Debounce_DIS_High
CAD_INT
FROM
ROW0–7,
COL0–9
SCL
SCL
SCL
P port
P port
STANDARD MODE,
FAST MODE, FAST
TO
MODE PLUS (FM+)
I²C BUS
UNIT
MIN
MAX
20
60
INT
INT, CAD_INT
INT
CAD_INT
ROW0–7,
COL0–9
SCL
SCL
40
120
µs
10
30
20
60
200 ns
400 ns
0
ns
300
ns
KEYPAD SWITCHING CHARACTERISTICS
PARAMETER
Key press to detection delay
Key release to detection delay
Keypad unlock timer
Keypad interrupt mask timer
Debounce
STANDARD MODE, FAST MODE, FAST
MODE PLUS (FM+)
I²C BUS
MIN
MAX
25
25
7
31
60
UNIT
µs
µs
s
s
ms
LOGIC DIAGRAM (POSITIVE LOGIC)
INT
Interrupt
Control
SCL
SDA
V_CC
RESET
I²C Bus
Control
Power-On
Reset
Oscillator
(32 kHz)
Control
Registers
and FIFO
Keypad
Control
ROW0–COL9
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): TCA8418
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