8
DPS70
Inputs
2.2.1. DPS70 Frequency Input Capabilities
Direct coupled frequency inputs allow you to read the frequency of external
signals that have a ground reference and no DC offset. These inputs are ideal for
use with hall-effect type sensors.
The following table provides specifications for the DPS70's direct coupled
frequency inputs:
Direct Coupled Frequency Input Specifications
Item
MIN
NOM
MAX
UNIT
Negative going switching threshold
1.56
V
Positive going switching threshold
3.82
V
Input capacitance at pin
.005
µF
Over-voltage
36
V
Frequency accuracy
5
%
Frequency range
(note 1)
0
10000
Hz
Pull-up/down resistor
10
kΩ
Note 1: Electrically signals to 0 are possible, but the software will limit the minimum measureable frequency
2.2.2. DPS70 Frequency Input Installation Connections
As with analog inputs, direct-coupled frequency inputs are also susceptible to
system noise and ground shift.
