MC33989PEG Freescale Semiconductor, MC33989PEG Datasheet - Page 15

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

Table 4. Dynamic Electrical Characteristics (continued)
values noted reflect the approximate parameter means at T
consumption receiver (WU receiver). Then the signal passes through a pulse width filter, which discards the undesired pulses.
The pulse must have a width bigger than 0.5 µs and smaller than 500 µs to be accepted. When a pulse is discarded the pulse
counter is reset and no wake signal is generated, otherwise when a pulse is accepted the pulse counter is incremental and after
three pulses the wake signal is asserted.
is generated. This is accomplished by the wake timeout generator. The wake-up cycle is completed (and the wake flag reset)
when the CAN interface is brought to CAN Normal mode.
Analog Integrated Circuit Device Data
Freescale Semiconductor
Non Differential Slew Rate (CANL or CANH)
Characteristics noted under conditions 7.0 V ≤ V
The block diagram in
Each one of the pulses must be spaced by no more than 500 µs. In that case, the pulse counter is reset and no wake signal
The wake-up capability of the CAN can be disabled, refer to SPI interface and register section, CAN register.
Slew Rate 3
Slew Rate 2
Slew Rate 1
Slew Rate 0
CANL
CANH
Standby
Figure 4
Characteristic
WU Receiver
illustrates how the wake-up signal is generated. First the CAN signal is detected by a low
Figure 5. Transient Test Pulse for L0:L3 Inputs
GND
Figure 4. Wake-up Block Diagram
ISO 7637 part1, test pulses 1, 2, 3a and 3b.
Pulse Width
LX
Note: Waveform in accordance to
Filter
SUP
≤ 18 V, - 40°C ≤ T
10 k
Pulse OK
Narrow
Pulse
A
1nF
= 25°C under nominal conditions, unless otherwise noted.
Transient Pulse
A
Symbol
Generator
Generator
≤ 125°C, GND = 0 V, unless otherwise noted. Typical
Timeout
(Note)
t
t
t
t
Counter
SL3
SL2
SL1
SL0
GND
RST
+
Timeout
DYNAMIC ELECTRICAL CHARACTERISTICS
Min
4.0
3.0
2.0
1.0
Latch
RST
ELECTRICAL CHARACTERISTICS
13.5
Typ
8.0
5.0
19
WU
OUT
Max
40
20
15
10
Unit
V/µs
33989
15