The VMM2404 has 8 solid-state FET technology outputs designed for low to
medium current and high inrush inductive load switching. Output currents can
range up to 3.0 A.
The VMM2404 has 2 types of outputs:
High-side outputs
Low-side outputs with current sense
Note: A high-side and a low-side output can be used to create a half-bridge.
An H-bridge output can be created from 2 half-bridges, allowing 2 full H-
bridge outputs to be produced (refer to Controlling a Linear Actuator for an
example of how to use an H-bridge).
4.1. High-side outputs
The VMM2404 has 4 high-side outputs:
OUTPUT1_3A_HS to OUTPUT4_3A_HS
4.1.1. High-Side Output Capabilities
High-side outputs are used for switching voltages to loads using either a pulse
width modulated (PWM) signal, or an on/off signal. They can also test for various
fault conditions, which can be used for software diagnostics (see High-Side
Output Diagnostics and Fault Protection for more details).
All high-side outputs come with internal flyback diodes that provide protection
when driving inductive loads.
When a high-side output is used as a PWM signal, a pulsed output signal is
provided by the VMM2404, where the percentage of time that the output is
“on” vs. “off” is determined by the duty cycle of the signal, and the duty cycle
is determined by the application software.
When a high-side output is used as an on/off signal, the output provides
battery voltage when in the “on” state (the application software is responsible
for switching high-side outputs On and Off).
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