DYNAMIC ELECTRICAL CHARACTERISTICS Figure 4." />
參數(shù)資料
型號： MC33989DWR2
廠商： Freescale Semiconductor
文件頁數(shù)： 7/72頁
文件大小： 0K
描述： IC SYSTEM BASE W/CAN 28-SOIC
標(biāo)準(zhǔn)包裝： 1
控制器類型： 系統(tǒng)基礎(chǔ)芯片
接口： CAN
電源電壓： 5.5 V ~ 18 V
電流 - 電源： 45mA
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 28-SOIC W
包裝： 剪切帶 (CT)
配用： KIT33989DWEVB-ND - KIT EVAL 33989DW HS SBC
其它名稱： MC33989DWR2CT
Analog Integrated Circuit Device Data
Freescale Semiconductor
15
33989
ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
Figure 4. Wake-up Block Diagram
The block diagram in Figure 4 illustrates how the wake-up signal is generated. First the CAN signal is detected by a low
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 s and smaller than 500 s 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.
Figure 5. Transient Test Pulse for L0:L3 Inputs
Each one of the pulses must be spaced by no more than 500 s. In that case, the pulse counter is reset and no wake signal
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.
The wake-up capability of the CAN can be disabled, refer to SPI interface and register section, CAN register.
Non Differential Slew Rate (CANL or CANH)
Slew Rate 3
Slew Rate 2
Slew Rate 1
Slew Rate 0
tSL3
tSL2
tSL1
tSL0
4.0
3.0
2.0
1.0
19
13.5
8.0
5.0
40
20
15
10
V/s
Table 4. Dynamic Electrical Characteristics (continued)
Characteristics noted under conditions 7.0 V
VSUP 18 V, -40C TA 125C, GND = 0 V, unless otherwise noted. Typical
values noted reflect the approximate parameter means at TA = 25°C under nominal conditions, unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
+
WU
OUT
Latch
RST
Timeout
RST
Counter
Pulse OK
Narrow
Pulse
Pulse Width
Filter
Timeout
Generator
Standby
WU Receiver
CANH
CANL
LX
Transient Pulse
GND
Generator
1nF
(Note)
10 k
Note: Waveform in accordance to
ISO 7637 part1, test pulses 1, 2, 3a and 3b.
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