L9615 데이터 시트보기 (PDF) - STMicroelectronics

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L9615

CAN BUS TRANSCEIVER

STMicroelectronics 

L9615

DINAMIC CHARACTERISTICS (CA = 47pF between C_H and C_L; VS = 5V; tR < 5ns;

CRXO = 20pF between RXO and B; RA = 60Ω between C_H and C_L)

Symbol

tOT

SR

tOR

tOTR

Parameter

Signal Delay TXO to C_H, C_L

Differential Output Slew Rate

(Transmitter)

Signal Delay C_H, C_L to RXO

Signal Delay TXO to RXO

Test Condition

VASC = 0V

VASC = VS

VASC = 0V

VASC = 0V

Min.

20

5

Typ.

Max.

50

50

20

150

300

Unit

ns

V/µs

V/µs

ns

ns

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. 10µs to prevent de-

struction of the IC and high consumption of

supply current IS. If VC_L >VC_Lmax the transmitter

output stages would be disabled immediately.

Pin ASC makes it possible to select two different

TYPICAL APPLICATION

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-

ingg the ASC pin to VS.

FUNCTIONAL TABLE

TXO

L

H or

Floating

C_H

H

Floating

VS/2

C_L

L

Floating

VS/2

Bus State

Dominant

Recessive

RXO

L

H

VCOM

VSn

SYSTEM n

CONTROLLER

L9615

VGNDn

VGNDD

VGNDm

RA

VSm

SYSTEM m

CAN BUS

L9615

CONTROLLER

C_H

RA

VDiff

C_L

VGNDm

D96AT247A

4/8

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