MC33989PEG Freescale Semiconductor, MC33989PEG Datasheet - Page 28

• Manufacturer Part Number: MC33989PEG
• Description: SBC-HS
• Manufacturer: Freescale Semiconductor

FUNCTIONAL DEVICE OPERATION
RESET AND WATCHDOG PINS, SOFTWARE WATCHDOG OPERATIONS
28
33989
STATE MACHINE DESCRIPTION:
30.
31.
32.
33.
34.
35.
36.
37.
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39.
40.
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43.
1
Notes These two SPI commands must be sent consecutively in this sequence.
Nostop = Nostop bit = 1
! Nostop = Nostop bit = 0
BATFAIL = Batfail bit = 1
! BATFAIL = Batfail bit = 0
V
V
V
WD: Trigger = TIM1 register write operation.
V
WD: Timeout = TIM1 register not written before WD timeout period expired, or WD written in incorrect time window if window WD
selected (except stop mode). In Normal Request mode timeout is 355 ms
SPI: Sleep = SPI write command to MCR register, data sleep
SPI: Stop = SPI write command to MCR register, data stop
SPI: Normal = SPI write command to MCR register, data normal
SPI: Stand-by = SPI write command to MCR register, data stand-by
30.
2
DD1
DD1
DD1
SUP
Power
Down
3
Over Temperature = V
low = V
low >100 ms = V
> BFew = V
If WD activated.
4
Reset
denotes priority
DD1
below reset threshold
SUP
(V DD1 High Temperature OR (V DD1 1 Low > 100ms & V SUP >BFew)) & Nostop &!BATFAIL
> Battery Fall Early Warning (6.1 V typical)
DD1
below reset threshold for more than 100 ms
DD1
Figure 13. State Machine (Not Valid in Debug Modes)
Reset Counter (3.4
ms) Expired
thermal shutdown occurs
V DD1 Low OR WD:
Timeout 350 ms
&!Nostop
WD: Timeout OR V DD1 Low
WD: Timeout OR V DD1 Low
1
1
Normal
Wake-up
Stop
2
2
4
WD:
SPI: Stop & CS
Low to High
p2.2
Transition
3
SPI: Stand-by
& WD Trigger
Timeout
(350 ms p3) ms.
&
Analog Integrated Circuit Device Data
Normal
Nostop
Stand-by
1
1
Freescale Semiconductor
Sleep