MC33989PEG Freescale Semiconductor, MC33989PEG Datasheet - Page 45

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

LX Wakes up SBC from Sleep Mode
CAN Wake-up
TCAN analysis.
LX with Cyclic Sense
Analog Integrated Circuit Device Data
Freescale Semiconductor
Below is the case where the SBC is in sleep mode and is awaked by LX positive edge.
• T1 (LX high level to V
• T2: V
• T3 (VDD1>RST-TH (4.6 V by default) to reset high): parameter Rest dur: 4.0 ms max.
• The total time is 6.6 ms in this example.
The following case describes the signal for CAN wake-up. Refer to page
• T1(third valid CAN dominant pulse to V
• T2 and T3 identical to page
• The total time is 6.58 ms in this example.
The case below is a description of the wake-up by LX input associated with the cyclic sense function.
charging time with the regulator output current limitation: T2 = (C x U)/I. With C = 100 mF, I
so T2 = 2.5 ms).
VDD1
RST
DD1
LX
LX
VDD1
RESET
HS1
RST
RESET
rising time is dependent on the capacitor and the load connected to V
CAN
VDD1
RST
DD1
t1
turn on): typ 100 µs.
40
tCAN
above
t1
DD1
Figure 28. Wake-up by LX Input
Figure 26. SBC in Sleep Mode
t2
turn on): typ 80 µs.
Figure 27. CAN Wake-up
t1
t2
t3
t3
t2
51
for more details on CAN wake-up signals and the
t4
DD1
. It can be approximated by the capacitor
SUPPLEMENTAL APPLICATION NOTES
t3
DD1
= 200 mA min., U = 5.0 V
TYPICAL APPLICATIONS
33989
45