900844 Datasheet, PDF (36/118 Pages) Freescale Semiconductor, Inc – Integrated Power Management IC for Ultra-mobile and Embedded Applications

FUNCTIONAL DEVICE OPERATION
SYSTEM CONTROL INTERFACE
EXIT_STBY
SPI BUS
VR Statsus
VR_COMP#
AOACCTLVxx
copied to TVxx
Existing Mode
IDLE
VR Reconfigure
t_{VR_COMP}
Figure 11. General Exit Standby Diagram
New Mode
30 μsec
EXIT_STBY
SPI BUS
AOACCTLVxx
copied to CTLVxx
IDLE
VR Status
VR_COMP#
Existing Mode
VR Reconfigure
New Mode
t_{VR_COMP}
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 V_DDQ regulator has to be enabled in order for the V_CCA 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 kΩ) pull-up to VCCPAOAC. The PMIC only responds to a THERMTRIPB signal if the
V_CCP 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.
900844
36
Analog Integrated Circuit Device Data
Freescale Semiconductor