mc33742 Freescale Semiconductor, Inc, mc33742 Datasheet - Page 29

• Manufacturer Part Number: mc33742
• Description: Mc33742 System Basis Chip Sbc With Enhanced High-speed Can Transceiver
• Manufacturer: Freescale Semiconductor, Inc

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