13892 datasheet(86/158 Pages) FREESCALE

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FUNCTIONAL DEVICE OPERATION

SUPPLIES

Analog Integrated Circuit Device Data



Freescale Semiconductor

MC13892

PERIPHERAL INTERFACING

IC interfaces in the lineups generally fall in two categories: low voltage IO primarily associated with the AP IC and certain

peripherals at SPIVCC level (powered from SW4), and a higher voltage interface level associated with other peripherals not

compatible with the 1.8 V SPIVCC. VIOHI is provided at a fixed 2.775 V level for such interfaces, and may also be applied to

other system needs within the guidelines of the regulator specifications. The input VINIOHI is not only used by the VIOHI

regulator, but also by other blocks, therefore it should always be connected to BP, even if the VIOHI regulator is not used by the

system.

VIOHI has an internal PMOS pass FET which will support loads up to 100 mA.

CAMERA

The camera module is supplied by the regulator VCAM. This allows powering the entire module independent of the rest of

other parts of the system, as well as to select from a number of VCAM output levels for camera vendor flexibility. In applications

with a dual camera, it is anticipated that only one of the two cameras is active at a time, allowing the VCAM supply to be shared

between them.

VCAM has an internal PMOS pass FET which will support up to 2.0 Mpixel Camera modules (<65 mA). To support higher

resolution cameras, an external PNP is provided. The external PNP configuration is offered to avoid excess on-chip power

dissipation at high loads, and large differential between BP and output settings. For lower current requirements, an integrated

PMOS pass FET is included. The input pin for the integrated PMOS option is shared with the base current drive pin for the PNP

option. The external PNP configuration must be committed as a hardwired board level implementation, while the operating mode

is selected through the VCAMCONFIG bit after startup. The VCAM is not automatically enabled during the power up sequence,

allowing software to properly set the VCAMCONFIG bit before the regulator is activated. The recommended PNP device is the

ON Semiconductor NSS12100XV6T1G which is capable of handling up to 250 mW of continuous dissipation at a minimum

footprint and 75 °C of ambient. For use cases where up to 500 mW of dissipation is required, the recommended PNP device is

the ON Semiconductor NSS12100UW3TCG. For stability reasons a small minimum ESR may be required.

The input VINCAM should always be connected to BP, even if the VCAM regulator is not used by the system.

MULTI-MEDIA CARD SUPPLY

This supply domain is generally intended for user accessible multi-media cards, such as Micro-SD (TransFlash), RS-MMC,

and the like. An external PNP is utilized for this LDO to avoid excess on-chip power dissipation at high loads and large differential

between BP and output settings. The external PNP device is always connected to the BP line in the application. VSD may also

be applied to other system needs within the guidelines of the regulator specifications. The recommended PNP device is the ON

Semiconductor NSS12100XV6T1G, which is capable of handling up to 250 mW of continuous dissipation at a minimum footprint

and 75 °C of ambient. For use cases where up to 500 mW of dissipation is required, the recommended PNP device is the ON

Semiconductor NSS12100UW3TCG. For stability reasons a small minimum ESR may be required. At the 1.8 V set point, the

VSD regulator can be powered from an external buck regulator (2.2 V typ) for an efficiency advantage and reduced power

dissipation in the pass devices.

Table 56. VCAM Voltage Control

Parameter

Value

Output Voltage

ILoad max

VCAMCONFIG=0

Internal Pass FET

VCAMCONFIG=1

External PNP

VCAM[1:0]

2.5 V

65 mA

250 mA

2.6 V

65 mA

250 mA

2.75 V

65 mA

250 mA

3.00 V

65 mA

250 mA

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