FUNCTIONAL DEVICE OPERATION
SUPPLIES
Figure 25. Transient Waveforms
SHORT-CIRCUIT PROTECTION
The higher current LDOs and those most accessible in product applications include short-circuit detection and protection
(VVIDEO, VAUDIO, VCAM, VSD, VGEN1, VGEN2, and VGEN3). The short-circuit protection (SCP) system includes debounced
fault condition detection, regulator shutdown, and processor interrupt generation, to contain failures and minimize chance of
product damage. If a short-circuit condition is detected, the LDO will be disabled by resetting its VxEN bit while at the same time
an interrupt SCPI will be generated to flag the fault to the system processor.
The SCPI interrupt is maskable through the SCPM mask bit.
The SCP feature is enabled by setting the REGSCPEN bit. If this bit is not set, then not only is no interrupt generated, but also
the regulators will not automatically be disabled upon a short-circuit detection. However, the built-in current limiter will continue
to limit the output current of the regulator. Note that by default, the REGSCPEN bit is not set, so at startup none of the regulators
that are in an overload condition will be disabled
VAUDIO AND VVIDEO SUPPLIES
The primary applications of these power supplies are for audio, and TV-DAC. However these supplies could also be used for
other peripherals if one of these functions is not required. Low Power modes and programmable Standby options can be used
to optimize power efficiency during Deep Sleep modes.
13892
Analog Integrated Circuit Device Data
84
Freescale Semiconductor
FREESCALE [ Freescale ]
