900844 Datasheet, PDF (52/118 Pages) Freescale Semiconductor, Inc – Integrated Power Management IC for Ultra-mobile and Embedded Applications

FUNCTIONAL DEVICE OPERATION
POWER STATES AND CONTROL
POWER STATES
Figure 18 shows the flow of power, the different power states, and the conditions necessary to transition between the different
states. This diagram serves as the basis for the description in the remainder of this section.
NO PWR
VBAT < VBATOFF
VCOIN < VCOINOFF
VBAT > VBATOFF
RTC STATE
* RTC Is Powered
* Time of Day is kept
* Keep alive registers are powered
* All other Circuits OFF
VBAT < VLOWBAT &
VCOIN > VCOINOFF
VBAT > VLOWBAT
RAMP UP
VBAT > VLOWBAT
BAT Operation
* VPWR = VBAT
* VPWR > VPWRUVR
BATDET INT= 1
* Internal supplies/references ON
* Logic is Reset
* Initial power sequence
performed
* SPI Ready
* SCU Interrupted
VBAT < VBATOFF &
VCOIN < VCOINOFF
VBAT < VBATOFF &
VCOIN < VCOINOFF
VPWR < VPWRUVF &
VCOIN > VCOINOFF
ACTIVE STATE
SCU CONTROL
(BAT Operation)
VBAT < Vtrkl &
VCOIN > VCOINOFF
* VPWR = VBAT
RDSTATE = 0x00
* SCU takes control
* SCU Sets the system
Figure 18. 900844 Power States
900844
52
Analog Integrated Circuit Device Data
Freescale Semiconductor