Supply and V
參數(shù)資料
型號： MC33389DDW
廠商： Freescale Semiconductor
文件頁數(shù)： 11/49頁
文件大?。?/td> 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： 管件
Analog Integrated Circuit Device Data
Freescale Semiconductor
19
33389
FUNCTIONAL DEVICE OPERATION
Supply and VBAT Block
VBAT Monitoring—VBAT is the main power supply coming
from the battery voltage after an external protection diode
(for reverse battery). VBAT is monitored for under voltage
and over voltage.
VBAT Under Voltage—VBAT is monitored for under voltage
if it is below 4.0 V the BatFail flag is set in the VSSR
register and a maskable interrupt is sent to the
microcontroller.
VBAT Over Voltage— When VBAT is > 20 V, the BatHigh
flag is set in the VSSR register. A maskable interrupt is
sent to the microcontroller. No specific action is taken to
reduce current consumption (to limit power dissipation).
This is to allow the entire flexibility to the microcontroller for
a decision.
CAN Transceiver
The device incorporates a low speed 125 kBaud CAN
physical interface. Its electrical parameters for the CANL,
CANH, RTL,RTH, RX, and TX pins are identical to the 33388,
stand alone CAN physical interface.
The mode control for the CAN transceiver (Normal, VBAT
Stand-by, Sleep, etc.) are selectable through the 33389 SPI
interface.
Baud Rate up to 125 kBit/s
Supports unshielded bus wires
Short-circuit proof to battery and ground in 12 V powered
systems
Supports single-wire transmission modes with ground
offset voltages up to 1.5 V
Automatic switching to single wire mode in case of bus
failures
Automatic reset to differential mode if bus failure is
removed
Low Electromagnetic Interference (EMI) due to built-in
slope control and signal symmetry
Fully integrated receiver filters
Thermally protected
Bus lines protected against automotive transients
Low current Bus Stand-by mode with wake-up capability
via the bus
An unpowered node does not disturb the bus lines
Figure 5. CAN Simplified Block Diagram
CONSEQUENCE OF FAILURE DETECTIONS
S1 is the switch from RTH to Ground
S2 is the switch from RTL to V2 and
S3 is the switch from RTL to VBAT
Each failure type provides data concerning which switch is
open and which driver is disabled.
Failure 1: Nothing done
Failure 2: Nothing done
Failure3: S1 open. Driver CANH is disabled
Failure4: S2 and S3 open. Driver CANL is disabled
Failure5: Nothing done
Failure6: S2 and S3 open. Driver CANL disabled
Failure7: S2 and S3 open. Driver CANL disabled
Failure8: S1 Open. CANH driver disable
CAN Transceiver Description
The CAN transceiver is an interface between CAN
protocol controller and the physical bus. It is intended for low
—
In Sleep Mode, During
Disable Time of Cyclic
Sense if Configured
—
Over Temp Threshold Reached
—
V1 Disabled (for any reason)
—
V2 Over Temperature Shutdown
Table 8. V3 Control
Termination
Protection
RX
TX
CAN_H
CAN_L
RTH
RTL
VDD2
SPI
Transmitter
Receiver
- Fail Detect
- Receive Mode
VDD2 VBAT
CAN Transceiver Register
Drivers
CAN transceiver simplified block diagram
12.5k
S3
S2
S1
VDD BAT
RTL
CANH
CANL
RTH
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