MC33389CDW Freescale, MC33389CDW Datasheet - Page 19

• Manufacturer Part Number: MC33389CDW
• Manufacturer: Freescale

Specifications of MC33389CDW

• Number Of Transceivers: 1
• Power Down Mode: Sleep/Standby
• Operating Supply Voltage (max): 27V
• Operating Supply Voltage (typ): 9/12/15/18/24V
• Operating Supply Voltage (min): 5.5V
• Package Type: SOIC W
• Supply Current: 7mA
• Operating Temperature (max): 125C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 28
• Lead Free Status / RoHS Status: Not Compliant

TX
RX
Table 8. V3 Control
Supply and V
• V
• V
• V
CAN Transceiver
physical interface. Its electrical parameters for the CANL,
CONSEQUENCE OF FAILURE DETECTIONS
open and which driver is disabled.
Analog Integrated Circuit Device Data
Freescale Semiconductor
CAN transceiver simplified block diagram
from the battery voltage after an external protection diode
(for reverse battery). V
and over 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.
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.
The device incorporates a low speed 125 kBaud CAN
S1 is the switch from RTH to Ground
S2 is the switch from RTL to V2 and
S3 is the switch from RTL to V
Each failure type provides data concerning which switch is
Failure 1: Nothing done
Failure 2: Nothing done
Failure3: S1 open. Driver CANH is disabled
BAT
BAT
BAT
Transmitter
Receiver
Under Voltage—V
Monitoring—V
Over Voltage— When V
V DD2
- Fail Detect
- Receive Mode
—
—
—
—
BAT
CAN Transceiver Register
Block
Protection
BAT
BAT
BAT
is the main power supply coming
V2 Over Temperature Shutdown
is monitored for under voltage
Over Temp Threshold Reached
is monitored for under voltage
V1 Disabled (for any reason)
V DD2 V BAT
BAT
Termination
BAT
In Sleep Mode, During
Disable Time of Cyclic
Sense if Configured
Drivers
is > 20 V, the BatHigh
Figure 5. CAN Simplified Block Diagram
CAN_H
CAN_L
RTL
RTH
SPI
CANH, RTL,RTH, RX, and TX pins are identical to the 33388,
stand alone CAN physical interface.
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
• Supports single-wire transmission modes with ground
• Automatic switching to single wire mode in case of bus
• Automatic reset to differential mode if bus failure is
• Low Electromagnetic Interference (EMI) due to built-in
• Fully integrated receiver filters
• Thermally protected
• Bus lines protected against automotive transients
• Low current Bus Stand-by mode with wake-up capability
• An unpowered node does not disturb the bus lines
Failure8: S1 Open. CANH driver disable
CAN Transceiver Description
protocol controller and the physical bus. It is intended for low
The mode control for the CAN transceiver (Normal, V
systems
offset voltages up to 1.5 V
failures
removed
slope control and signal symmetry
via the bus
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
The CAN transceiver is an interface between CAN
V
DD BAT
S2
FUNCTIONAL DEVICE OPERATION
12.5k
S3
S1
RTL
CANH
CANL
RTH
33389
BAT
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