PCA82C250
CAN controller interface
Rev. 06 — 25 August 2011
Product data sheet
1. General description
The PCA82C250 is the interface between a CAN protocol controller and the physical bus.
The device provides differential transmit capability to the bus and differential receive
capability to the CAN controller.
2. Features and benefits
Fully compatible with the
“ISO 11898”
standard
High speed (up to 1 MBd)
Bus lines protected against transients in an automotive environment
Slope control to reduce Radio Frequency Interference (RFI)
Differential receiver with wide common-mode range for high immunity against
ElectroMagnetic Interference (EMI)
Thermally protected
Short-circuit proof to battery and ground
Low-current Standby mode
An unpowered node does not disturb the bus lines
At least 110 nodes can be connected
3. Applications
High-speed automotive applications (up to 1 MBd).
4. Quick reference data
Table 1.
Symbol
V
CC
I
CC
1/t
bit
V
CAN
V
diff
t
PD
T
amb
Quick reference data
Parameter
supply voltage
supply current
maximum transmission speed
CANH, CANL input/output voltage
differential bus voltage
propagation delay
ambient temperature
High-speed mode
Standby mode
non-return-to-zero
Conditions
Min
4.5
-
1
8
1.5
-
40
Max
5.5
170
-
+18
3.0
50
+125
Unit
V
A
MBd
V
V
ns
C
NXP Semiconductors
PCA82C250
CAN controller interface
5. Ordering information
Table 2.
Ordering information
Package
Name
PCA82C250T
SO8
Description
plastic small outline package; 8 leads; body width 3.9 mm
Version
SOT96-1
Type number
6. Block diagram
V
CC
3
TXD
1
PROTECTION
Rs
8
SLOPE/
STANDBY
DRIVER
HS
7
CANH
RXD
4
RECEIVER
6
CANL
V
ref
5
REFERENCE
VOLTAGE
PCA82C250
2
GND
mka669
Fig 1.
Block diagram
7. Pinning information
7.1 Pinning
TXD 1
GND 2
8 Rs
7
CANH
CANL
V
ref
PCA82C250
V
CC
RXD
3
4
mka670
6
5
Fig 2.
Pin configuration
PCA89C250
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 06 — 25 August 2011
2 of 18
NXP Semiconductors
PCA82C250
CAN controller interface
7.2 Pin description
Table 3.
Symbol
TXD
GND
V
CC
RXD
V
ref
CANL
CANH
Rs
Pin description
Pin
1
2
3
4
5
6
7
8
Description
transmit data input
ground
supply voltage
receive data output
reference voltage output
LOW-level CAN voltage input/output
HIGH-level CAN voltage input/output
slope resistor input
8. Functional description
The PCA82C250 is the interface between a CAN protocol controller and the physical bus.
It is primarily intended for high-speed automotive applications (up to 1 MBd). The device
provides differential transmit capability to the bus and differential receive capability to the
CAN controller. It is fully compatible with the
“ISO 11898”
standard.
A current limiting circuit protects the transmitter output stage against short-circuit to
positive and negative battery voltage. Although the power dissipation is increased during
this fault condition, this feature will prevent destruction of the transmitter output stage.
If the junction temperature exceeds a value of approximately 160
C,
the limiting current
of both transmitter outputs is decreased. Because the transmitter is responsible for the
major part of the power dissipation, this will result in reduced power dissipation and hence
a lower chip temperature. All other parts of the PCA82C250 will remain in operation. The
thermal protection is needed, in particular, when a bus line is short-circuited.
The CANH and CANL lines are also protected against electrical transients which may
occur in an automotive environment.
Pin 8 (Rs) allows three different modes of operation to be selected: High-speed, Slope
control and Standby.
For high-speed operation, the transmitter output transistors are simply switched on and off
as fast as possible. In this mode, no measures are taken to limit the rise and fall slope.
Use of a shielded cable is recommended to avoid RFI problems. The High-speed mode is
selected by connecting pin 8 to ground.
For lower speeds or shorter bus length, an unshielded twisted pair or a parallel pair of
wires can be used for the bus. To reduce RFI, the rise and fall slope should be limited. The
rise and fall slope can be programmed with a resistor connected from pin 8 to ground. The
slope is proportional to the current output at pin 8.
If a HIGH level is applied to pin 8, the circuit enters a low-current Standby mode. In this
mode, the transmitter is switched off and the receiver is switched to a low current. If
dominant bits are detected (differential bus voltage >0.9 V), RXD will be switched to a
PCA89C250
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 06 — 25 August 2011
3 of 18
NXP Semiconductors
PCA82C250
CAN controller interface
LOW level. The microcontroller should react to this condition by switching the transceiver
back to normal operation (via pin 8). Because the receiver is slow in Standby mode, the
first message will be lost.
Table 4.
Supply
4.5 V to 5.5 V
4.5 V to 5.5 V
< 2 V (not powered)
2 V < V
CC
< 4.5 V
2 V < V
CC
< 4.5 V
[1]
X = don’t care.
Truth table of the CAN transceiver
TXD
0
X
[1]
>0.75V
CC
X
[1]
CANH
HIGH
floating
floating
floating if
V
Rs
> 0.75V
CC
CANL
LOW
floating
floating
floating
Bus state
dominant
recessive
recessive
recessive
RXD
0
1
X
[1]
X
[1]
X
[1]
1 (or floating) floating
floating if
recessive
V
Rs
> 0.75V
CC
Table 5.
Pin Rs summary
Mode
Standby
Slope control
High-speed
Resulting voltage or current at pin Rs
I
Rs
<
10 A
0.4V
CC
< V
Rs
< 0.6V
CC
I
Rs
<
500 A
Condition forced at pin Rs
V
Rs
> 0.75V
CC
10 A
< I
Rs
<
200 A
V
Rs
< 0.3V
CC
9. Limiting values
Table 6.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are referenced
to pin 2; positive input current.
Symbol Parameter
V
CC
V
n
V
6, 7
V
trt
T
stg
T
amb
T
vj
V
esd
supply voltage
DC voltage at pins 1, 4, 5 and 8
DC voltage at pins 6 and 7
transient voltage at pins 6 and 7
storage temperature
ambient temperature
virtual junction temperature
electrostatic discharge voltage
[1]
[2]
[3]
Conditions
Min
0.3
0.3
Max
+9.0
+18.0
+100
+150
+125
+150
+2000
+200
Unit
V
V
V
C
C
C
V
V
V
CC
+ 0.3 V
0 V < V
CC
< 5.5 V;
no time limit
see
Figure 8
8.0
150
55
40
40
2000
200
[1]
In accordance with
“IEC 60747-1”.
An alternative definition of virtual junction temperature is:
T
vj
= T
amb
+ P
d
R
th(vj-a)
, where R
th(j-a)
is a fixed value to be used for the calculation of T
vj
. The rating for T
vj
limits the allowable combinations of power dissipation (P
d
) and ambient temperature (T
amb
).
Classification A: human body model; C = 100 pF; R = 1500
;
V =
2000
V.
Classification B: machine model; C = 200 pF; R = 25
;
V =
200
V.
[2]
[3]
PCA89C250
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 06 — 25 August 2011
4 of 18
NXP Semiconductors
PCA82C250
CAN controller interface
10. Thermal characteristics
Table 7.
Symbol
R
th(j-a)
Thermal characteristics
Parameter
thermal resistance from junction to ambient
Conditions
in free air
Typ
160
Unit
K/W
11. Characteristics
Table 8.
Characteristics
V
CC
= 4.5 to 5.5 V; T
amb
=
40 to +125
C; R
L
= 60
; I
8
>
10
A; unless otherwise specified; all voltages referenced to
ground (pin 2); positive input current; all parameters are guaranteed over the ambient temperature range by design, but only
100 % tested at +25
C.
Symbol Parameter
Supply
I
3
supply current
dominant; V
1
= 1 V
recessive; V
1
= 4 V; R
8
= 47 k
recessive; V
1
= 4 V; V
8
= 1 V
Standby; T
amb
< 90
C
DC bus transmitter
V
IH
V
IL
I
IH
I
IL
V
6,7
I
LO
V
7
V
6
V
6, 7
HIGH-level input voltage
LOW-level input voltage
HIGH-level input current
LOW-level input current
recessive bus voltage
off-state output leakage current
CANH output voltage
CANL output voltage
difference between output
voltage at pins 6 and 7
output recessive
output dominant
V
1
= 4 V
V
1
= 1 V
V
1
= 4 V; no load
2
V < (V
6,
V
7
) < 7 V
5
V < (V
6,
V
7
) < 18 V
V
1
= 1 V
V
1
= 1 V
V
1
= 1 V
V
1
= 1 V; R
L
= 45
;
V
CC
4.9 V
V
1
= 4 V; no load
I
sc7
I
sc6
V
diff(r)
short-circuit CANH current
short-circuit CANL current
differential input voltage
(recessive)
differential input voltage
(dominant)
differential input hysteresis
HIGH-level output voltage
V
7
=
5
V; V
CC
5 V
V
7
=
5
V; V
CC
= 5.5 V
V
6
= 18 V
0.7V
CC
0.3
200
100
2.0
2
5
2.75
0.5
1.5
1.5
500
-
-
-
1.0
7
V < (V
6,
V
7
) < 12 V;
not Standby mode
7
V < (V
6,
V
7
) < 12 V;
not Standby mode
see
Figure 5
pin 4; I
4
=
100 A
1.0
0.9
1.0
-
0.8V
CC
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
150
-
V
CC
+ 0.3 V
0.3V
CC
+30
600
3.0
+1
+12
4.5
2.25
3.0
-
+50
105
120
160
+0.5
+0.4
5.0
5.0
-
V
CC
V
A
A
V
mA
mA
V
V
V
V
mV
mA
mA
mA
V
V
V
V
mV
V
[1]
Conditions
Min
-
-
-
-
Typ
-
-
-
100
Max
70
14
18
170
Unit
mA
mA
mA
A
DC bus receiver: V
1
= 4 V; pins 6 and 7 externally driven;
2
V < (V
6,
V
7
) < 7 V; unless otherwise specified
V
diff(d)
V
diff(hys)
V
OH
PCA89C250
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 06 — 25 August 2011
5 of 18
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