L9615
CAN BUS TRANSCEIVER
L9615 MEETS ISO/DIS 11898 UP TO
500KBAUD
TRANSMITTER
- GENERATION OF DIFFERENTIAL OUTPUT
SIGNALS
- SHORT CIRCUIT PROTECTED FROM -5V
TO 36V, DETECTION & SHUTDOWN
- SLOPE CONTROL TO REDUCE RFI AND EMI
- TWO STATES ADJUSTABLE SLOPE
CONTROL (
500KBAUD/
125KBAUD)
RECEIVER
- DIFFERENZIAL INPUT WITH HIGH
INTERFERENCE SUPPRESSION
- COMMON MODE INPUT VOLTAGE RANGE
(V
COM
) FROM -2V TO V
S
+3V
PACKAGE: SO 8
DESCRIPTION
The L9615 is a bidirectional transceiver for signal
conditioning and processing in connection with a
CAN controller. Data rates of up to 500KBAUD
are supported using either shielded or non-
shielded pair of lines.
February 1998
1
&
RX0
TX0
RX1
V
S
C_H
C_L
D96AT245
1
V
S
+
-
td
1
&
1
1
+
-
M
M
M
GND
3
7
6
2
ASC
V
REF
V
CLmax
1
8
4
5
RECEIVER
PROTECTION
TRANSMITTER
BLOCK DIAGRAM
SO8
ORDERING NUMBER: L9615D
1/8
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
Supply Voltage
-0.3 to 7
V
V
C_H
, V
C_L
Bus Voltage at C_H, C_L (VS 0 to 5.5V)
-5 to 36
V
I
C_H
, I
C_L
Off State Leakage Current at C_H, C_L ( VS =0 to 5.5V,
V
C_H
= -5 to 36V, V
C_L
= -5 to 36 )
-3 to 5
mA
V
DC
DC Voltage at TXO, ASC (VS 0 to 5.5V)
GND -0.3 to V
S
+0.3
V
I
RXO
Output Current at RXO (V
S
0 to 5.5V)
-0.3 to 1
mA
T
stg
, T
J
Storage and Junction Temperature Range
-40 to 150
C
T
op
Operating Temperature Range
-40 to 110
C
All voltages, except bus voltage, are defined with respect to pin 2
Positive currents flow into the IC.
THERMAL DATA
Symbol
Parameter
Value
Unit
PIN FUNCTIONS
N.
Name
Function
1
TXO
Transmitter Input
2
GND
Ground
3
V
S
Supply Voltage
4
RXO
Receive Output
5
RX1
Reference Voltage
6
C_L
Low Side Bus Output
7
C_H
High Side Bus Output
8
ASC
Adjustable Slope Control
TX0
GND
V
S
RX0
RX1
C_L
C_H
ASC
1
3
2
4
6
5
7
8
D96AT246
PIN CONNECTION
L9615
2/8
ELECTRICAL CHARACTERISTICS (T
OP
= -40 to 110C; V
S
= 4.5 to 5.5V; Dominat: VTXO = GND; Re-
cessive: VTXO = V
S
; All voltages, except bus voltage, are defined with respect to pin 2. Positive currents
flow into the IC unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Supply Voltage
4.5
5
5.5
V
I
S
Supply Current
Dominant
80
mA
Recessive
20
mA
TRANSMITTER SECTION (R
A
= 60
between C_H and C_L)
C
TXO
TXO Input Capacitance
0V < V
TXO
< V
S
25
pF
V
TXO
TXO High Level Input Voltage
0.7 V
S
V
S
TXO Low Level Input Voltage
0
0.3 V
S
I
TXO
TXO High Level Input Current
V
TXO
= V
S
-2
0
2
A
TXO Low Level Input Current
V
TXO
= GND
-275
0
-25
A
C
ASC
ASC Input Capacitance
0V < V
ASC
< V
S
25
pF
V
ASC
ASC Input Voltage for High
Speed
0
0.1 V
S
ASC Input Voltage for Low Speed
0.9 V
S
VS
I
ASC
ASC Input Current
V
ASC
= V
S
25
275
A
V
ASC
= 0V
-2
0
2
A
V
C_H
, V
C_L
Bus Voltage Recessive
Recessive
0.4 V
S
0.5 Vs
0.6 Vs
I
C_H
, I
C_L
Leakage Current Recessive
VC_L = V
C_H
= -2 to 7V
-0.7
0.7
mA
V
C_L
= V
C_H
= 1 to 4V
-0.3
0.3
mA
R
IN(C_H
,
C_L)
Input Resistence
Recessive
5
50
K
R
Diff(C_H
,
C_L)
Differential Input Resistence
Recessive
10
100
K
V
Diff
=
V
C_H
- V
C_L)
Differential Output Voltage
Dominant, R
A
1.5
3
V
V
Diff
=
V
C_H
- V
C_L)
Differential Output Voltage
Recessive
-500
0
50
mV
t
d
Short Circuit Detection Time
C_H to C_L ; C_H to B
R
CS
< 1
1
5
10
s
I
A
Supply Current in Case of Short
Circuit, C_H to C_L, C_H to B
(time = t
d
)
150
mA
V
C_Lmax
Overvoltage Protection
Threshold on C_L
7
8
10
V
RECEIVE SECTION
V
RXO
RXO High Level Output Voltage
V
Diff
< 0.5V; I
RXO
= 0.3mA;
V
C_H
= -2 to 7V; V
C_L
= -2 to 7V;
0.9 V
S
Vs
V
RXO Low Level Output Voltage
V
Diff
> 0.9V; I
RXO
= 1mA;
V
C_H
= -2 to 7V; V
C_L
= -2 to 7V;
0.5
V
V
S
=
V
C_H
-V
C_L
Input Signal Threshold
V
C_H
= -2 to 7V; V
C_L
= -2 to 7V;
500
700
900
mV
V
COM
= (V
C_H
+V
C_L
)/2
Input Common Mode Voltage
Range
-2
7
V
V
HYS
Differential Input Hysteresis
150
mV
REFERENCE OUTPUT
V
RX1
Reference Voltage
I
RX1
= 0
0.45 V
S
0.5 V
S
0.55 V
S
V
R
RX1
Output Resistance
2
9
K
L9615
3/8
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
s to prevent de-
struction of the IC and high consumption of
supply current I
S
. If V
C_L
>V
C_Lmax
the transmitter
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-
ingg the ASC pin to V
S
.
FUNCTIONAL TABLE
TXO
C_H
C_L
Bus State
RXO
L
H
L
Dominant
L
H or
Floating
Floating
V
S
/2
Floating
V
S
/2
Recessive
H
DINAMIC CHARACTERISTICS (C
A
= 47pF between C_H and C_L; V
S
= 5V; t
R
< 5ns;
C
RXO
= 20pF between RXO and B; R
A
= 60
between C_H and C_L)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
t
OT
Signal Delay TXO to C_H, C_L
50
ns
S
R
Differential Output Slew Rate
(Transmitter)
V
ASC
= 0V
20
50
V/
s
V
ASC
= V
S
5
20
V/
s
t
OR
Signal Delay C_H, C_L to R
XO
V
ASC
= 0V
150
ns
t
OTR
Signal Delay T
XO
to R
XO
V
ASC
= 0V
300
ns
CONTROLLER
L9615
L9615
CONTROLLER
CAN BUS
SYSTEM n
V
COM
R
A
V
Sn
V
GNDn
V
GNDD
V
GNDm
R
A
V
Diff
C_H
C_L
SYSTEM m
V
GNDm
V
Sm
D96AT247A
TYPICAL APPLICATION
L9615
4/8
t
OTR
t
OTR
t
OR
t
OR
0.5V
0.9V
t
OT
t
OT
t
R
t
R
V
TX0
V
Diff
V
RX0
D96AT248
TIMING DIAGRAM
MONITORING
(BIT COMPARISON)
CAN
CONTROLLER
1
CAN
CONTROLLER
2
CAN
TRANSCELVER
1
CAN
TRANSCELVER
2
250Kbit/sec
250Kbit/sec
HP8640
30
30
EQUIVALENT TERMINATING
RESISTOR 2 x 120
PARALLEL AT LINE ENDS
6.8
F
6.8
F
100
450
Ust (Noise signal)
50
40dB
90%AM, 1KHz
10MHz
1MHz
100MHz
500MHz
1GHz
NOISE RESISTANT
NOT NOISE RESISTANT
L9615
min. request boundary
(automotive industry)
U
ST
(V)
30V
SS
20V
SS
10V
SS
D96AT249B
EMC PERFORMANCE (RECEIVER)
L9615
5/8
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