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PCA82C251T
CAN transceiver for 24 V systems
1. General descriptionThe PCA82C251 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 11898-24 V” standard Slope control to reduce Radio Frequency Interference (RFI) Thermally protected Short-circuit proof to battery and ground in 24 V powered systems Low-current Standby mode An unpowered node does not disturb the bus lines At least 110 nodes can be connected High speed (up to 1 MBd) High immunity against electromagnetic interference.
3. Applications High-speed applications (up to 1 MBd) in trucks and busses.
4. Quick reference data
PCA82C251
CAN transceiver for 24 V systems
Rev. 04 — 25 August 2011 Product data sheet
Table 1. Quick reference dataVCC supply voltage 4.5 5.5 V
ICC supply current Standby mode - 275 A
1/tbit maximum transmission speed non-return-to-zero 1 - MBd
VCAN CANH, CANL input/output voltage 36 +36 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 PCA82C251
CAN transceiver for 24 V systems
5. Ordering information
6. Block diagram
7. Pinning information
7.1 Pinning
Table 2. Ordering informationPCA82C251T SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96-1
NXP Semiconductors PCA82C251
CAN transceiver for 24 V systems
7.2 Pin description
8. Functional descriptionThe PCA82C251 is the interface between a CAN protocol controller and the physical bus.
It is primarily intended for applications up to 1 MBd in trucks and buses. The device
provides differential transmit capability to the bus and differential receive capability to the
CAN controller. It is fully compatible with the “ISO 11898-24 V” standard.
A current-limiting circuit protects the transmitter output stage against short-circuits to
positive and negative battery voltage. Although power dissipation will increase as a result
of a short circuit fault condition, this feature will prevent destruction of the transmitter
output stage.
If the junction temperature exceeds approximately 160 C, the limiting current of both
transmitter outputs is decreased. Because the transmitter is responsible for most of the
power dissipated, this will result in reduced power dissipation and hence a lower chip
temperature. All other parts of the IC will remain operational. 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 slopes. A
shielded cable is recommended to avoid RFI problems. High-speed mode is selected by
connecting pin 8 to ground.
Slope control mode allows the use of an unshielded twisted pair or a parallel pair of wires
as bus lines. To reduce RFI, the rise and fall slopes should be limited. The rise and fall
slopes 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 PCA82C251
CAN transceiver for 24 V systemsLOW level. The microcontroller should react to this condition by switching the transceiver
back to normal operation (via pin 8). Because the receiver is slower in Standby mode, the
first message will be lost at higher bit rates.
[1] If another bus node is transmitting a dominant bit, then RXD is logic 0.
[2] X= don’t care.
9. Limiting values[1] TXD is LOW. Short-circuit protection provided for slew rates up to 5 V/s for voltages above +30V.
[2] Short-circuit applied when TXD is HIGH, followed by TXD switched to LOW.
[3] 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).
[4] Classification A: human body model; C= 100 pF; R= 1500 ; V= 2000V.
[5] 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 1[1]
4.5V< VCC <5.5V X[2] floating if
VRs >0.75VCC
floating if
VRs> 0.75VCC
floating X[1]
0V
Table 5. Pin Rs summary
VRs >0.75VCC Standby IRs <10A A< IRs <200A Slope control 0.4VCC VRs <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 +7.0 V DC voltage at pins1,4, 5 and8 0.3 VCC +0.3V DC voltage at pin 6 (CANL) 0V< VCC< 5.5 V; TXD HIGH or floating 36 +36 V
0V0VVtrt transient voltage at pins 6 and7 see Figure8 200 +200 V
Tstg storage temperature 55 +150 C
Tamb ambient temperature 40 +125 C
Tvj virtual junction temperature [3] 40 +150 C
VESD electrostatic discharge voltage [4] 2500 +2500 V
[5] 250 +250 V
NXP Semiconductors PCA82C251
CAN transceiver for 24 V systems
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= 4.5Vto 5.5 V; Tamb= 40 C to +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; VCC =5.1V - - 78 mA
dominant; V1 =1V; VCC =5.25V - - 80 mA
dominant; V1 =1V; VCC =5.5V - - 85 mA
recessive; V1 =4V; R8 =47k -- 10 mA
Standby [1]- - 275 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 - 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- +2 mA
5V<(V6, V7)<36V 10 - +10 mA CANH output voltage V1 =1V; VCC =4.75V to 5.5V 3.0 - 4.5 V =1V; VCC= 4.5 V to 4.75V 2.75 4.5 CANL output voltage V1=1V 0.5 - 2.0 V
V6,7 difference between output
voltage at pins 6 and7=1V 1.5 - 3.0 V =1V; RL =45 1.5 - - V=4 V; no load 500 - +50 mV
Isc7 short-circuit CANH current V7= 5V - - 200 mA= 36V - 100- mA
Isc6 short-circuit CANL current V6=36V - - 200 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)
[2] 1.0 - +0.5 V
7V<(V6,V7)<12V [2] 1.0 - +0.4 V
Vdiff(d) differential input voltage
(dominant)
0.9 - 5.0 V
7V<(V6,V7)<12 V; not Standby
mode
1.0 - 5.0 V
Standby mode 0.97 - 5.0 V
Standby mode; VCC= 4.5 V to 5.10V 0.91 - 5.0 V
NXP Semiconductors PCA82C251
CAN transceiver for 24 V systems
[1] I1 =I4=I5 =0mA; 0V[2] This is valid for the receiver in all modes: High-speed, Slope control and Standby.
Vdiff(hys) differential input hysteresis see Figure5 - 150 - mV
VOH HIGH-level output voltage pin 4; I4= 100 A0.8VCC -VCC V
VOL 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
Reference output
Vref reference output voltage V8 =1V; I5 <50 A0.45VCC- 0.55VCC V =4V; I5 <5 A0.4VCC -0.6VCC V
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 ; Tamb <+85C
VCC= 4.5 V to 5.1V 80 150 ns
Rext =0 ; VCC= 4.5 V to 5.1V - 80 170 ns
Rext =0 ; Tamb <+85C - 90 170 ns
Rext =0k - 90 190 ns
Rext =47k - 290 400 ns
tonRXD delay TXD to receiver active Rext =47k - 440 550 ns
SR CANH, CANL slew rate Rext =47k -7 - V/s
tWAKE wake-up time from Standby
(via pin8)
see Figure6 -- 20 s
tdRXDL bus dominant to RXD LOW V8=4 V; see Figure7 -- 3 s
Standby/Slope control (pin8)
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= 4.5Vto 5.5 V; Tamb= 40 C to +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 PCA82C251
CAN transceiver for 24 V systems
NXP Semiconductors PCA82C251
CAN transceiver for 24 V systems
