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MC34708 датащи(PDF) 41 Page - Freescale Semiconductor, Inc

номер детали MC34708
подробное описание детали  Power Management Integrated Circuit (PMIC) for i.MX50/53 Families
PDF  159 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC34708 датащи(HTML) 41 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
41
Freescale Semiconductor
MC34708
Functional Block Description
7.5.3.6
Timers
The different timers as used by the state machine are listed by the following. This listing does not include RTC timers for
timekeeping. A synchronization error of up to one clock period may occur with respect to the occurrence of an asynchronous
event, the duration listed below is therefore the effective minimum time period.
7.5.3.6.1
Timing Diagrams
A Turn On event timing diagrams shown in Figure 7.
Figure 7. Power Up Timing Diagram
Table 26. Timer Main Characteristics
Timer
Duration
Clock
Under-voltage Timer
4.0 ms
32 k/32
Reset Timer
40 ms
32 k/32
Watchdog Timer
128 ms
32 k/32
Power Cut Timer
Programmable 0 to 8 seconds
in 31.25 ms steps
32 k/1024
RESETB
WDI
INT
UV Masking
8 ms
20 ms
12 ms
Power Up Sequencer
Turn On Verification
128 ms
2- Cold Start
1- Off
System Core Active
3- Watchdog
4- On
1- Off
3- Watchdog
Power up of the system upon a Turn On Event followed by a transition to the On state if WDI is pulled high
... or transition to Off state if WDI remains low
Turn On Event
Sequencer time slots
WDI Pulled Low
= Indeterminate State
ow
Turn on Event is based on PWRON being pulled low
8 ms



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