Datasheet

PCA9701_PCA9702 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 7 — 26 September 2014 9 of 29
NXP Semiconductors
PCA9701; PCA9702
18 V tolerant SPI 16-bit/8-bit GPI with INT
7.3.1 V
IL
, V
IH
and switching points
A minimum LOW threshold of 2.0 V is guaranteed for the logical switching points for the
inputs. See Figure 7
for details.
The V
IL
is specified as a maximum of 0.40  V
DD
and is 2.0 V at 4.5 V V
DD
. This means
that if the user applies 2.0 V or less to the input (with V
DD
= 4.5 V), or as the voltage
passes this threshold, they will always see a LOW.
The V
IH
is specified as a minimum of 0.7  V
DD
. This means that if the user applies 3.15 V
or more to the input (with V
DD
= 4.5 V), or as the voltage passes this threshold, they will
always see a HIGH.
Fig 7. Logic level thresholds for general purpose inputs
002aae128
V
I
V
DD
hysteresis
minimum
0 V
0.4V
DD
0.7V
DD
HIGH
LOW
V
IH
V
IL
possible ground shift