MC33889BDW Freescale, MC33889BDW Datasheet - Page 30

• Manufacturer Part Number: MC33889BDW
• Manufacturer: Freescale

Specifications of MC33889BDW

• Number Of Transceivers: 1
• Standard Supported: CAN 2.0
• Operating Supply Voltage (max): 18V
• Operating Supply Voltage (min): 5.5V
• Package Type: SOIC W
• Supply Current: 45mA
• 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

CAN TRANSCEIVER DESCRIPTION
General description
CAN driver:
(5V). The CANL driver is a “low side” switch to gnd.The turn
on and turn off time is controlled in order to control the slew
rate, and the CANH and CANL driver have a current limitation
as well as an over temperature shutdown.
failure is detected on the CAN bus (ex: CANH driver is
disabled in case CANH is shorted to V
one of the drivers is controlled by the CAN logic and the
communication continues via the other drivers. When the
failure is removed the logic detects a failure recovery and
automatically reenables the associated driver.
detection.
Bus termination:
which are connected to GND, VDD or VBAT through
dedicated RTL and RTH pins and internal switches Srh, Srl,
30
33889
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
The CANH driver is a “high side” switch to the V2 voltage
The CAN H or CANL driver can be disabled in case a
The CAN drivers are also disabled in case of a Tx failure
The bus is terminated by pull up and pull down resistors,
TXD
RXD
V2
VSE-L (3.05V)
SPI
VSE-H (1.85V)
Rx multiplexer
CANH
CANL
Figure 12. Simplified Block Diagram of the CAN Transceiver of the MC33889
Failure detection
mode control
SL
CAN
SH
Tx driver
DD
). The disabling of
Lwake
Vdiff
Driver
Vwake-L (3V)
CANL
Stvbat
Vsup
Stvbat. Each node must have a resistor connected between
CANH and RTH and between CANL and RTL. The resistor
value should be between 500 and 16000 ohms.
Transmitter Function
correspond respectively to Low and High states of the TX
input pin.
is <1.4V, the voltage at CANH is >3.6V, and the differential
voltage between CANH and CANL line is >2.2V (3.6V-1.4V).
are off. The CANL line is pulled up to 5V via the RTL pin and
RTL resistor, and the CANH line is pull down via the RTH and
RTH resistor. The resultant voltage at CANL is 5V and 0V at
CANH. The differential voltage is -5V (0V - 5V). The
recessive state can be over written by any other node forcing
a Dominant state.
CAN bus levels are called Dominant and Recessive, and
Dominant state:
The CANH and CANL drivers are on. The voltage at CANL
Recessive state:
This is a weak state, where the CANH and CANL drivers
Driver
Hwake
Vwake-H (2V)
SRL
CANH
SRH
V2
Analog Integrated Circuit Device Data
V2
Freescale Semiconductor
CANH
RTH
CANL
RTL
GND
RtH
RtL