900844 datasheet(36/118 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

900844

FUNCTIONAL DEVICE OPERATION

SYSTEM CONTROL INTERFACE

Figure 11. General Exit Standby Diagram

Figure 12. Optimized Exit Standby Diagram

The power-on default AOACCTLVxx register setting for the VCCP, VCCPDDR, VCCA, and VCC180 rails, are to be turned on

by the assertion of the EXITSTBY signal. However, every regulator has an AOACCTLVxx register setting, and can be configured

to turn on, turn off, or have no change. The power-on default AOACCTLVxx register setting for all other regulators is set to no

change. Note that the VDDQ regulator has to be enabled in order for the VCCA regulator to turn on.

THERMTRIPB Pin

THERMTRIPB is an active low Thermal Trip input signal. It is asserted by the CPU to indicate a catastrophic thermal event.

On the falling edge of THERMTRIPB, the PMIC has 500 ms to sequence off all rails from the highest to lowest. The PMIC will

turn on automatically upon detecting a turn on event, at which point the cold boot flow should be followed as shown in Turn on

Events.

The PMIC provides a weak (50 -100 k

Ω) pull-up to VCCPAOAC. The PMIC only responds to a THERMTRIPB signal if the

VCCP regulator is on. The platform controller hub output driver is a nominal 55 Ω.

The THERMTRIPB pin follows the DC Signaling specifications in Table 3 with a reference of 1.05 V (VCCPAOAC).

VIDEN[1:0] & VID[6:0] Pins

Both VCC and VNN regulators are variable in the CPU and supply two different sub-systems. The CPU implements a VID

mechanism that minimizes the number of required pins. The VID for VNN and VCC are multiplexed on to the same set of pins,

and a separate 2-bit enable/ID is defined to specify to which sub-system the driven VID corresponds. One of the combinations

notifies that the VID is invalid. This is used when the CPU is in C6/Standby, to tri-state the VID pins to save power.

EXIT_STBY

SPI BUS

VR Stats

VR_COMP#

IDLE

Existing Mode

VR Reconfigure

New Mode

tVR_COMP

AOACCTLVxx

copied to TVxx

Status

EXIT_STBY

SPI BUS

VR Status

VR_COMP#

IDLE

Existing Mode

VR Reconfigure

New Mode

tVR_COMP

AOACCTLVxx

copied to CTLVxx

μsec

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