4.1.3.1. Short Circuit
Short-circuit faults occur when a high-side output pin is shorted to ground. Refer
to the VMM2404 Platform Framework API document distributed with the SDK
for details on how to recover from a short circuit.
4.1.3.2. Open Load
Open load faults occur when a low-side output pin is open circuit (not connected
to a load). The use of this feature operates is defined in the VMM2404 Platform
Framework API document distributed with the SDK.
Note: Low-side outputs must be on to detect an open-load fault.
4.1.3.3. Short-to-Battery
Short-to-battery faults occur when a high-side output pin is connected to battery
voltage.
The high-side output circuit uses voltage on the output pin to determine if a short-
to-battery condition exists.
Note: To detect a short-to-battery fault, high-side outputs must be off.
4.2. Low-Side Outputs with Current Sense
The VMM2404 has 4 low-side outputs:
OUTPUT5_3A_LS to OUTPUT8_3A_LS
4.2.1. Low-Side Outputs with Current Sense Capabilities
Low-side outputs with current sense are used for switching grounds to loads using
either a pulse width modulated (PWM) signal, or an on/off signal. They also have
the ability to sense current that is provided to loads, through an amplifier circuit.
When a low-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.
Note: Current flow gets interrupted when using low-side outputs as a PWM
signal, because the outputs are not On continuously. Therefore, current
feedback control systems should use a high-side output for PWM signals, and
a low-side output (turned on at 100%) for sensing current.
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