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L9669
FAULT TOLERANT CAN TRANSCEIVER
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L9669December 2000 L9669 FAULT TOLERANT DIFFERENTIAL
CAN TRANSCEIVER OPERATING SUPPLY VOLTAGE 6V TO 28V,
TRANSIENTS UP TO 40V LOW QUIESCENT CURRENT IN STANDBY
MODE (<160μA) AND SLEEP MODE (<65μA) ON CHIP DIAGNOSIS FOR ERRORS ON THE
PHYSICAL BUSLINES WITH MICRO
CONTROLLER INTERFACE OPTIMIZED EMI BEHAVIOUR DUE TO LIMITED
AND SYMMETRIC SLOPES OF CAN SIGNALS AUTOMATIC SWITCHING TO SINGLE WIRE
MODE UPON BUS FAILURES TWO-EDGE SENSITIVE WAKE-UP PIN
DESCRIPTIONThe L9669 is an integrated circuit which contains a
CAN physical line interface. It integrates all main lo-
cal functions for automotive body electronic applica-
tions connected to a CAN bus.
PRODUCT PREVIEWFAULT TOLERANT CAN TRANSCEIVER
Figure 1. Block Diagram
L9669 2/12
Figure 2. Pin Connection top view.
Table 1. Pin Functions
Table 2. Thermal Data
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L9669
Table 3. Absolute Maximum RatingsFor externally applied voltages or currents exceeding these limits damage of the circuit may occur!
Notes:1. All pins of the IC are protected against ESD. The verification is performed according to MIL 883C, human body model with= 1.5kΩ, C= 100pF and discharge voltage ±2000V, corresponding to a maximum discharge energy of 0.2mJ. Voltage forced means voltage limited to specified values while current is not limited. Current forced means voltage unlimited but
current limited to specified value.
Table 4. Electrical CharacteristcsVCC= 5V, VS= 14V, Tj =-40°C to 150°C unless otherwise specified.
L9669 4/12
Table 4. Electrical Characteristcs (continued)VCC= 5V, VS= 14V, Tj =-40°C to 150°C unless otherwise specified.
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L9669
Table 4. Electrical Characteristcs (continued)VCC= 5V, VS= 14V, Tj =-40°C to 150°C unless otherwise specified.
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1.0 FUNCTIONAL DESCRIPTIONThe L9669 is a monolithic integrated circuit which provides all main functions for an automotive body CAN sys-
tem. The device guarantees a clearly defined behavior in case of failure to avoid permanent CAN bus errors. It
is primarily intended for low speed applications in passenger cars.
1.1 Transceiver Supports double wire unshielded busses Baud rates up to 125 kBaud Single wire operation possible (automatic switching to single wire upon bus failures) Bus not loaded in case of unpowered transceiver
The CAN transceiver stage is able to transfer serial data on two independent communication wires either differ-
entially (normal operation) or in case of a single wire fault on the remaining line. The physical bitcoding is done
using dominant (transmitter active) and overwritable recessive states. Too long dominant phases are detected
internally and further transmission is automatically disabled (malfunction of protocol unit does not affect com-
munication on the bus (“fail safe mechanism”)).
1.2 Modes of OperationFive different functional modes exist to enable or establish the usage of low power or receive only operation.
Note: Wake-up interrupts are released when entering RXonly or normal mode.
Table 4. Electrical Characteristcs (continued)VCC= 5V, VS= 14V, Tj =-40°C to 150°C unless otherwise specified.
