13892 datasheet(84/156 Pages) FREESCALE

84 / 156 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

13892

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 Datasheet(PDF) 84 Page - Freescale Semiconductor, Inc