900844 Datasheet, PDF (55/118 Pages) Freescale Semiconductor, Inc – Integrated Power Management IC for Ultra-mobile and Embedded Applications

Table 22. 900844 Initial Power Up Timing
Parameter
Description
t₆
V21 turn on delay
t₇
V21 ramp-up
t₈
VPMIC turn on delay
t₉
VPMIC ramp-up
t₁₀
PWRGD delay
t₁₁
RESET delay
t₁₂
PMICINT delay
FUNCTIONAL DEVICE OPERATION
POWER STATES AND CONTROL
Min
Typ
Max
0 μs
-
31 μs
-
-
100 μs
0 μs
-
31 μs
-
-
700 μs
70 ms
-
90 ms
1.0 μs
-
31 μs
31 μs
-
124 μs
TURN OFF EVENTS
The following conditions cause the 900844 to power off the system, including the SCU, but the 900844 internal circuitry and
logic are still active:
• PWRBTN pressed for more than 5 seconds. See Power Button Functionality (PWRBTN).
• The 900844 junction temperature is above the thermal shutdown threshold. See Thermal Management for more details.
• A THERMTRIPB assertion. See THERMTRIPB Pin for more details.
Power Button Functionality (PWRBTN)
The Power Button is pulled up internally through a 132 k resistor to the V_COREDIG output voltage node. See Figure 20 for more
details.
.
V_COREDIG
PWRBTN
132k
Figure 20. PWRBTN Circuit Diagram
Figure 21 describes the functionality of the PWRBTN
Figure 21. PWRBTN Function Flow Diagram
Analog Integrated Circuit Device Data
Freescale Semiconductor
900844
55