10
DPS70
Inputs
Digital Input 1 to Digital Input 3 can be configured as wake-up inputs. When the
unit is in inactive power mode and a high signal is applied to a digital input
configured as a wake-up input, the unit will enter normal operating mode and
begin to operate.
Note:
A digital input that is configured as a wake-up input must also be
hardware configured as an active-high input (pull-down resistor) to
prevent the system from continuously remaining powered up.
The following table provides specifications for the DPS70's digital inputs:
Digital Input Specifications - HW configurable as Active-High or Active-Low
Item
Min
Nom
Max
Unit
Input voltage range
0
32
V
Over-voltage
36
V
Inductive load protection
no
Input capacitance
.05
µF
Response time to step input
1.5
ms
Input high threshold
4.62
V
Input low threshold
1.98
V
Active-High Configuration
Input resistance to ground
1.2
kΩ
High threshold @ 9 V
1
kΩ
Low threshold @ 16 V
8.2
kΩ
Active-Low configuration
Input resistance to 3.3 V
(note 1)
1.2
kΩ
High threshold
700
Ω
Low threshold
200
Ω
Note 1: Active low has pull-up to 3.3V through a diode to prevent backfeeding into power supply.
2.3.2. Digital Input Installation Connections
A digital input is typically connected to a switch that is either open or closed.
When the input is active-low
▪
When the switch is open, the pull-up resistor ensures that voltage exists on the
input signal, which will be interpreted by the DPS70 as inactive
▪
When the switch is closed, the input is connected to ground, which will be
interpreted by the DPS70 as active
