Datasheet
PCA9703 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved.
Product data sheet Rev. 4 — 5 September 2014 9 of 28
NXP Semiconductors
PCA9703
18 V tolerant SPI 16-bit GPI with maskable INT
The minimum required series resistance for applications with input voltages above 5.5 V
is 100 k. For applications requiring an applied voltage above 27 V, Equation 1
is
recommended to determine the series resistor. Failure to include the appropriate input
series resistor may result in product failure and will void the warranty.
(1)
The series resistor should be place physically as close as possible to the connected input
to reduce the effective node capacitance. The input response time is effected by the RC
time constant of the series resistor and the input node capacitance.
7.4.1 V
IL
, V
IH
and switching points
A minimum LOW threshold of 2.5 V is guaranteed for the logical switching points for the
inputs. See Figure 5
for details.
The V
IL
is specified as a maximum of 0.55 V
DD
and is 2.5 V at 4.5 V V
DD
. This means
that if the user applies 2.5 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 0.8 V
DD
. This means that if the user applies 3.6 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.
R
s
voltage applied 17 V–
I
I
------------------------------------------------------------
=
Fig 5. Logic level thresholds
002aae101
V
I
V
DD
hysteresis
minimum = 0.04V
DD
0 V
0.55V
DD
0.8V
DD
HIGH
LOW
V
IH
V
IL
possible ground shift