SUPPLEMENTAL APPLICATION NOTES Figure 37. Bus Term" />
參數(shù)資料
型號： MC33989DWR2
廠商： Freescale Semiconductor
文件頁數(shù)： 48/72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
52
Freescale Semiconductor
33989
TYPICAL APPLICATIONS
SUPPLEMENTAL APPLICATION NOTES
Figure 37. Bus Termination
CAN Mode versus SBC Modes
The table below indicates the CAN interface modes versus the SBC modes as well as the status of TX, RX and the CAN bus
pins.
Table 35. CAN vs SBC Modes
How to Test the MC33989 CAN Interface
The CAN interface can be easily set up and tested. MC33989 can be connected as in the following figure. V2 is connected to
V1. The device is supplied with nominal supply (12 V at VSUP input pin). After power on, reset the device, enter normal request
mode, and the CAN interface is set in normal mode, slew rate 0. TX can be driven by a signal generator. RX will report the bus
state. The figure below is a simple test schematic.
SBC mode
External
ballast
for V2
CAN mode
V2
voltage
TX
RX
CANH/CANL
(disconnected
from other
nodes)
Unpowered
YES
Unpowered
0 V
LOW
Floating to gnd
Reset (with ballast)
YES
0 V
LOW
Floating to gnd
Normal request (with ballast)
YES
0 V
LOW
Floating to gnd
Normal
YES
Normal Slew rate
0,1,2,3
5.0 V
Internal pull-up
to V2.
Report bus state
High if bus
recessive, Low if
dominant
Bus recessive
CANH = CANL =
2.5 V
Normal
YES
Sleep mode
5.0 V
Floating to gnd
Standby with external ballast
YES
Normal or sleep
0 V
LOW
Floating to gnd
Standby without external
ballast, V2 connected to V1
NO
Normal
5.0 V
Same as
normal mode
Same as normal
mode
Same as normal
mode
Standby without external
ballast, V2 connected to V1
NO
Sleep
5.0 V
5 V
Floating to gnd
Sleep
—
Sleep
0 V
LOW
Floating to gnd
Stop
—
Sleep
0 V
LOW
Floating to gnd
TX
RX
CANH
CANL
RT
Gnd
CAN bus
MC33989
(partial drawing)
TX
RX
CANH
CANL
RT /2
Gnd
CAN bus
MC33989
(partial drawing)
Split termination concept
Differential termination concept
RT /2
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