3
2
1
OFF-OFF-ON
ON
OFF
(6 5 4)
3
2
1
OFF-OFF-OFF
ON
OFF
(6 5 4)
3
2
1
OFF-ON-OFF
ON
OFF
(6 5 4)
3
2
1
ON-OFF-OFF
ON
OFF
(6 5 4)
3
2
1
ON-OFF-OFF
ON
OFF
(6 5 4)
Table 2-2. Switch Configuration
4-Level Input
Setting
Switch Settings (3-2-1 or 6-5-4)
0
Tie 1k
Ω
to GND
R
Tie 20k
Ω
to GND
F
Float (leave pin open)
1
Tie 1k
Ω
to VIN or VDD
NOTE:
Since each 4-level input setting is controlled by a set of three adjacent switches, only one of
the three switches can be in the
ON
position at any time.
7
SNLU171 – September 2014
4-Level IO Control
Copyright © 2014, Texas Instruments Incorporated
