FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Watchdog: Timeout OR V
DD
Low
Watchdog: Time-out & Nostop &!BATFAIL
SPI: Stand-by and
Watchdog Trigger
2
Reset Counter (3.4 ms)
Expired
1
3
Standby
Reset
Normal Request
1
V
Low OR Watchdog:
DD
Timeout 350 ms & Nostop
4
2
Power
Down
1
Normal
Stop
SPI: Stop & CS
LOW to HIGH
Transition
1
Watchdog: Timeout OR V
Low
DD
Wake-Up
(V
DD
High Temperature OR [V
Low > 100 ms & V
> BFew]) & Nostop &!BATFAIL
DD
SUP
Sleep
Denotes priority
1
2
3
4
State Machine Description
Nostop = Nostop bit = 1
!Nostop = Nostop bit = 0
BATFAIL = Batfail bit = 1
!BATFAIL = Batfail bit = 0
Watchdog: Timeout = TIM1 register not written before watchdog timeout period
expired, or watchdog written in incorrect time window if watchdog window
selected (except Stop mode). In Normal Request mode, timeout is 355 ms
p2.2 (350 ms p3) ms.
V
V
V
Overtemperature = V
thermal shutdown occurs
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: Standby = SPI write command to MCR register, data standby
DD
DD
DD
DD
below reset threshold
LOW = V
DD
LOW > 100 ms = V
below reset threshold for more than 100 ms
DD
Watchdog: Trigger = TIM1 subregister write operation
> BFew = V > Battery Fail Early Warning (6.1 V typical)
V
SUP
SUP
Notes
42. These two SPI commands must be sent consecutively in this sequence.
43. If watchdog activated.
Figure 13. SBC State Diagram (Not Valid in Debug Modes)
Power-Up
Reset
Operation after power-up if no trigger appears
Operation after reset of BATFAIL if no trigger appears
Normal
Request
Yes
Batfail
No
No
No
Yes
Trigger
Yes
No Stop
Sleep
Normal
Figure 14. Operation After SBC Power-Up
33742
Analog Integrated Circuit Device Data
Freescale Semiconductor
29
FREESCALE [ Freescale ]
