TCA8418E_15 Datasheet, PDF (39/50 Pages) Texas Instruments – I2C Controlled Keypad Scan IC With Integrated ESD Protection

www.ti.com
Typical Application (continued)
ROW0
ROW1
ROW2
ROW3
TCA8418E
SCPS222C – MAY 2010 – REVISED OCTOBER 2015
1
2
3
4
5
6
7
8
9
*
0
#
COL0 COL1 COL2
Figure 32. Example Keypad
Since the TCA8418E will report keys pressed according to the values in the key value table, it will be important
to know what the TCA8418E’s values for these key locations are.
According to the key event table, the key presses are assigned in the following way:
Table 26. Key Event Table
Keypad Button
1
2
3
4
5
6
7
8
9
*
0
#
Key Event Table
Value (Decimal)
1
2
3
11
12
13
21
22
23
31
32
33
Copyright © 2010–2015, Texas Instruments Incorporated
Product Folder Links: TCA8418E
Submit Documentation Feedback
39