MC33989PEG Freescale Semiconductor, MC33989PEG Datasheet - Page 46

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

TYPICAL APPLICATIONS
SUPPLEMENTAL APPLICATION NOTES
WAKE-UP TIMING: STOP MODE
wake-up time described is the time from the wake-up event to the SBC INT pin. The wake-up time is the sum of several timings:
wake-up signal detection, the INT pulse, and a minimum delay between INT and SBC ready to operate. At the end of the wake-
up time, the SBC is ready to operate, however the MCU might have already been in a restart operation.
LX Wake-up
CAN Wake-up
TCAN analysis.
• T
• T1: Third pulse on CAN to INT pulse: typ 80 µs.
• The total time is 113 µs in this case.
CS Wake-up
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33989
• T1: Is dependent on the selected cyclic sense timing in the TIM2 register (5.0 to 400 ms). LX is sampled
• 10 µs before the end of cyclic sense on time. If the LX correct wake-up level happens just after the sample point, the wake-
• T2: It is the same time as LX to VDD1 turn on: typ 100 µs
• T3 & T4: same as page
• The total time is 11.5 ms (for a cyclic sense total time of 5.0 ms) in this example.
The following paragraphs describe the wake-up events from stop mode, and the sequence of the signals at the SBC level. The
Below is the case where the SBC is in stop mode and is awakened by an LX positive edge
• T1(L0 high level to INT pulse): typ 100 µs.
• The total time is 133 µs in this case.
The case below describes the signal for CAN wake-up. Refer to page
The figure below describes the wake up from a CS signal transition, while the SBC is in Stop mode.
CAN
up will be detected at the next HS1 activation and a complete period is lost.
CAN
INT
:
refer to page
L0
INT
51
t1
Wake-up signalled to MCU.
for more details.
tCAN
40
t INT + t S-1STSPI (33μs max)
Wake-up signalled to MCU.
t1
Figure 30. CAN Wake-up
Figure 29. Lx Wake-up
t INT + t S-1STSPI (33μs max)
SBC ready to accept SPI command.
51
for more details on CAN wake-up signals and the
SBC ready to accept SPI command.
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