FUNCTIONAL DESCRIPTION

The L9615 is used as an interface between a

CAN controller and the physical bus. The device

provides transmitting capability to the CAN con-

troller.

The transmitter outputs C_H and C_L are pro-

tected against short circuits and electrical tran-

sients which may occur in an automotive environ-

ment. In case of short circuit (C_H to C_L, C_H to

B) the protection circuit recognizes this fault con-

ditionand the transmitter output stages are dis-

abled with a delay of max. 10

µs to prevent de-

struction of the IC and high consumption of

output stages would be disabled immediately.

Pin ASC makes it possible to select two different

modes of operation: High speed (

≤500kBaud) and

low speed (

≤125kBaud).

The ASC pin is tied to GND for normal operation

at

≤500kBaud. For slower speed operation at

≤125kBaud the rise and fall slope of the bus out-

put can be decreased to reduce EMI by connect-

FUNCTIONAL TABLE

TXO

C_H

C_L

Bus State

RXO

L

H

L

Dominant

L

H or

Floating

Floating

Floating

Recessive

H

Ω between C_H and C_L)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Signal Delay TXO to C_H, C_L

50

ns

Differential Output Slew Rate

(Transmitter)

20

50

V/

µs

520

V/

µs

150

ns

300

ns

CONTROLLER

L9615

L9615

CONTROLLER

CAN BUS

SYSTEM n

C_H

C_L

SYSTEM m

D96AT247A

TYPICAL APPLICATION

L9615

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