MCZ33905BS3EK Freescale Semiconductor, MCZ33905BS3EK Datasheet - Page 54

• Manufacturer Part Number: MCZ33905BS3EK
• Description: IC SBC CAN HS 3.3V 32SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MCZ33905BS3EK

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

interface. It exist in a LS driver between CANL and GND, and
a HS driver from CANH to 5 V-CAN. Two differential
receivers are connected between CANH and CANL to detect
a bus state and to Wake-Up from CAN Sleep Mode. An
Can Interface Supply
The CAN interface also has a supply pass from the battery
line through the VSUP/2 pin. This pass is used in CAN Sleep
Mode to allow Wake-Up detection.
the CAN interface current is sourced from the 5 V-CAN pin.
During CAN LP Mode, the current is sourced from the VSUP/
2 pin.
TXD/RXD Mode
are ON. In this mode, the CAN lines are controlled by the TXD
pin level and the CAN bus state is reported on the RXD pin.
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CAN INTERFACE
CAN INTERFACE DESCRIPTION
The figure below is a high level schematic of the CAN
The supply voltage for the CAN driver is the 5 V-CAN pin.
During CAN communication (transmission and reception),
In TXD/RXD Mode, both the CAN driver and the receiver
5 V-CAN
RXD
TXD
SPI & State machine
SPI & State machine
5 V-CAN
SPI & State machine
Figure 35. CAN Interface Block Diagram
CAN INTERFACE DESCRIPTION
CAN INTERFACE
2.5 V
Thermal
Failure Detection
& Management
Differential
Detection
Pattern
Receiver
Driver
internal 2.5 V reference provides the 2.5 V recessive levels
via the matched R
to GND in CAN Sleep Mode. A dedicated split buffer provides
a low-impedance 2.5 V to the SPLIT pin, for recessive level
stabilization.
driver and receiver.The SPLIT pin is active and a 2.5 V
biasing is provided on the SPLIT output pin.
Receive Only Mode
CAN receiver active. In this mode, the device is only able to
report the CAN state on the RXD pin. The TXD pin has no
effect on CAN bus lines. The 5 V-CAN regulator must be ON.
The SPLIT pin is active and a 2.5 V biasing is provided on the
SPLIT output pin.
Operation in TXD/RXD Mode
Normal Mode and the TXD pin is recessive.
Driver
The 5 V-CAN regulator must be ON. It supplies the CAN
This mode is used to disable the CAN driver, but leave the
The CAN driver will be enabled as soon as the device is in
5 V-CAN
R
R
VSUP/2
Wake-up
IN
IN
Receiver
IN
QL
QH
Buffer
resistors. The resistors can be switched
Analog Integrated Circuit Device Data
CANH
CANL
SPLIT
Freescale Semiconductor