Vansco VMM3120, User Manual

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14 VMM3120
Inputs
3.1.3. Power Control Digital Inputs
The VMM3120 has 1 active-high power control digital inputs that are used for
waking up (turning on) the product, as follows:

INPUT1_D to INPUT2_D
3.1.3.1. Power Control Digital Input Capabilities
The VMM3120 has an active high power control digital input that must be
activated to power up the VMM3120.
The following table provides specifications for the VMM3120's power control
digital inputs:
Power Control Digital Input Specifications
Item MIN NOM MAX UNIT
Input voltage range 0 - 32 V
Pull-up/pull-down resistance (24 V system) 2.8 k - -
Ω
Minimum negative going threshold 1.56 - - V
Maximum positive going threshold - - 3.65 V
Cutoff frequency (hardware) - 170 - Hz
Overvoltage - - 36 V
Wetting current - - 10 mA
Note: The power control digital input voltage must be greater than 4.0 V
before it is considered an active high input.
The power control digital input wakes-up the VMM3120 when switched high to a
voltage of 4.0 V or greater, and turns the VMM3120 off when switched low to a
voltage less than 1.5 V. The VMM3120 will also shut off when an open circuit
condition occurs on the power control digital input.
3.1.3.2. Power Control Digital Inputs Configuration
The digital inputs (INPUT1_D and INPUT2_D) are configured as power control
digital inputs. When the inputs are configured as power control, then the wetting
current must also be configured.
When INPUT1_D and/or INPUT2_D are configured as a power control input:

The VMM3120 will only power up when the power control input is active and
only shut down when it is inactive.

The wetting current must be configured according to the following:

Because all power control digital inputs must be active high, they must
have an internal pull-down resistor. The pull-down resistance for digital
inputs is 2.8 kΩ.