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PCA82C250-PCA82C250T
CAN controller interface
1. General descriptionThe 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
PCA82C250
CAN controller interface
Rev. 06 — 25 August 2011 Product data sheet
Table 1. Quick reference dataVCC supply voltage 4.5 5.5 V
ICC supply current Standby mode - 170 A
1/tbit maximum transmission speed non-return-to-zero 1 - MBd
VCAN CANH, CANL input/output voltage 8+18 V
Vdiff differential bus voltage 1.5 3.0 V
tPD propagation delay High-speed mode - 50 ns
Tamb ambient temperature 40 +125 C
NXP Semiconductors PCA82C250
CAN controller interface
5. Ordering information
6. Block diagram
7. Pinning information
7.1 Pinning
Table 2. Ordering informationPCA82C250T SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96-1
NXP Semiconductors PCA82C250
CAN controller interface
7.2 Pin description
8. Functional descriptionThe 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 pin8.
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
Table 3. Pin descriptionTXD 1 transmit data input
GND 2 ground
VCC 3 supply voltage
RXD 4 receive data output
Vref 5 reference voltage output
CANL 6 LOW-level CAN voltage input/output
CANH 7 HIGH-level CAN voltage input/output 8 slope resistor input
NXP Semiconductors PCA82C250
CAN controller interfaceLOW 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.
[1] X= don’t care.
9. Limiting values[1] In accordance with “IEC 60747-1”. An alternative definition of virtual junction temperature is:
Tvj =Tamb +Pd Rth(vj-a), where Rth(j-a) is a fixed value to be used for the calculation of Tvj. The rating for Tvj
limits the allowable combinations of power dissipation (Pd) and ambient temperature (Tamb).
[2] Classification A: human body model; C= 100 pF; R= 1500 ; V= 2000V.
[3] Classification B: machine model; C= 200 pF; R=25 ; V= 200V.
Table 4. Truth table of the CAN transceiver4.5Vto 5.5V 0 HIGH LOW dominant 0
4.5Vto 5.5V 1 (or floating) floating floating recessive 12 V (not powered) X[1] floating floating recessive X[1]
2V
0.75VCC floating floating recessive X[1]
2VVRs >0.75VCC
floating if
VRs> 0.75VCC
recessive X[1]
Table 5. Pin Rs summary
VRs >0.75VCC Standby IRs<10 A
10 AVRs <0.3VCC High-speed IRs< 500A
Table 6. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are referenced
to pin 2; positive input current.
VCC supply voltage 0.3 +9.0 V DC voltage at pins1,4, 5 and8 0.3 VCC +0.3V
V6,7 DC voltage at pins 6 and7 0V< VCC <5.5V; time limit 8.0 +18.0 V
Vtrt transient voltage at pins 6 and7 see Figure8 150 +100 V
Tstg storage temperature 55 +150 C
Tamb ambient temperature 40 +125 C
Tvj virtual junction temperature [1] 40 +150 C
Vesd electrostatic discharge voltage [2] 2000 +2000 V
[3] 200 +200 V
NXP Semiconductors PCA82C250
CAN controller interface
10. Thermal characteristics
11. Characteristics
Table 7. Thermal characteristics
Rth(j-a) thermal resistance from junction to ambient in free air 160 K/W
Table 8. Characteristics
VCC= 4.5to 5.5 V; Tamb= 40to +125 C; RL =60 ; I8> 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.
Supply supply current dominant; V1 =1V - - 70 mA
recessive; V1 =4V; R8 =47k -- 14 mA
recessive; V1 =4V; V8 =1V - - 18 mA
Standby; Tamb <90C [1]- 100 170 A
DC bus transmitter
VIH HIGH-level input voltage output recessive 0.7VCC -VCC +0.3V
VIL LOW-level input voltage output dominant 0.3 - 0.3VCC V
IIH HIGH-level input current V1 =4V 200 - +30 A
IIL LOW-level input current V1 =1V 100 - 600 A
V6,7 recessive bus voltage V1=4 V; no load 2.0 - 3.0 V
ILO off-state output leakage current 2V<(V6,V7)<7V 2- +1 mA
5V<(V6,V7)<18V 5- +12 mA CANH output voltage V1 =1V 2.75 - 4.5 V CANL output voltage V1=1V 0.5 - 2.25 V
V6,7 difference between output
voltage at pins 6 and7=1V 1.5 - 3.0 V =1V; RL =45 ; VCC 4.9V 1.5 - - V=4 V; no load 500 - +50 mV
Isc7 short-circuit CANH current V7= 5V; VCC 5V - - 105 mA= 5V; VCC =5.5V - - 120 mA
Isc6 short-circuit CANL current V6=18V - - 160 mA
DC bus receiver: V1=4 V; pins 6 and 7 externally driven; 2V<(V6, V7)<7 V; unless otherwise specified
Vdiff(r) differential input voltage
(recessive) 1.0 - +0.5 V
7V<(V6, V7)<12V;
not Standby mode 1.0 - +0.4 V
Vdiff(d) differential input voltage
(dominant)
0.9 - 5.0 V
7V<(V6, V7)<12V;
not Standby mode
1.0 - 5.0 V
Vdiff(hys) differential input hysteresis see Figure5 -150 - mV
VOH HIGH-level output voltage pin 4; I4= 100 A0.8VCC -VCC V
NXP Semiconductors PCA82C250
CAN controller interface
[1] I1 =I4=I5 =0mA; 0VVOL LOW-level output voltage pin 4; I4=1 mA 0 - 0.2VCC V =10mA 0 - 1.5 V input resistance CANH, CANL 5 - 25 k
Rdiff differential input resistance 20 - 100 k input capacitance CANH, CANL - - 20 pF
Cdiff differential input capacitance - - 10 pF
Reference output
Vref reference output voltage V8 =1V; 50 A
Timing (CL= 100 pF; see Figure 3, Figure 4, Figure 6 and Figure7)
tbit minimum bit time Rext =0 -- 1 s
tonTXD delay TXD to bus active Rext =0 - - 50 ns
toffTXD delay TXD to bus inactive Rext =0 -40 80 ns
tonRXD delay TXD to receiver active Rext =0 - 55 120 ns
toffRXD delay TXD to receiver inactive Rext =0 ; VCC <5.1 V; Tamb <+85C - 82 150 ns
Rext =0 ; VCC <5.1 V; Tamb <+125C - 82 170 ns
Rext =0 ; VCC <5.5 V; Tamb <+85C - 90 170 ns
Rext =0 ; VCC <5.5 V; Tamb <+125C - 90 190 ns
tonRXD delay TXD to receiver active Rext =47k - 390 520 ns
Rext =24k - 260 320 ns
toffRXD delay TXD to receiver inactive Rext =47k - 260 450 ns
Rext =24k - 210 320 ns
SR differential output voltage
slew rate
Rext =47k -14 - V/s
tWAKE wake-up time from Standby via pin8 - - 20 s
tdRXDL bus dominant to RXD LOW V8=4 V; Standby mode - - 3 s
Standby/Slope Control (pin8) input voltage for high-speed - - 0.3VCC V input current for high-speed V8 =0V - - 500 A
Vstb input voltage for Standby mode 0.75VCC -- V
Islope slope control mode current 10 - 200 A
Vslope slope control mode voltage 0.4VCC -0.6VCC V
Table 8. Characteristics …continued
VCC= 4.5to 5.5 V; Tamb= 40to +125 C; RL =60 ; I8> 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.
NXP Semiconductors PCA82C250
CAN controller interface
NXP Semiconductors PCA82C250
CAN controller interface
NXP Semiconductors PCA82C250
CAN controller interface
12. Application information
