Philips PCA82C250-N4, PCA82C250T-N4 Datasheet

INTEGRATED CIRCUITS

DATA SHEET

PCA82C250

CAN controller interface

Product specification

2000 Jan 13

Supersedes data of 1997 Oct 21

File under Integrated Circuits, IC18

Philips Semiconductors	Product specification
CAN controller interface	PCA82C250

FEATURES

∙Fully compatible with the “ISO 11898” standard

∙High speed (up to 1 Mbaud)

∙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.

QUICK REFERENCE DATA

APPLICATIONS

∙ High-speed applications (up to 1 Mbaud) in cars.

GENERAL DESCRIPTION

The PCA82C250 is the interface between the CAN protocol controller and the physical bus. The device provides differential transmit capability to the bus and differential receive capability to the CAN controller.

SYMBOL		PARAMETER	CONDITIONS	MIN.	MAX.	UNIT
VCC	supply voltage			4.5	5.5	V
ICC	supply current		standby mode	−	170	μA
1/tbit	maximum transmission speed		non-return-to-zero	1	−	Mbaud
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
ORDERING INFORMATION
TYPE			PACKAGE
NUMBER	NAME		DESCRIPTION			CODE
PCA82C250	DIP8	plastic dual in-line package; 8 leads (300 mil)				SOT97-1
PCA82C250T	SO8	plastic small outline package; 8 leads; body width 3.9 mm				SOT96-1
PCA82C250U	−	bare die; 2790 × 1780 × 380 μm				−

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Philips Semiconductors	Product specification
CAN controller interface	PCA82C250
BLOCK DIAGRAM

		VCC
		3
1		PROTECTION
TXD
8	SLOPE/	DRIVER
Rs	STANDBY	HS
			7
4			CANH
		RECEIVER
RXD			6
			CANL
5	REFERENCE
Vref	VOLTAGE	PCA82C250
		2
		GND	MKA669

		Fig.1	Block diagram.
PINNING
SYMBOL	PIN	DESCRIPTION
TXD	1	transmit data input			handbook, halfpage
GND	2	ground			TXD	1		8	Rs
VCC	3	supply voltage			GND	2	PCA82C250	7	CANH
RXD	4	receive data output			VCC	3		6	CANL
Vref	5	reference voltage output
					RXD	4		5	Vref
CANL	6	LOW-level CAN voltage
		input/output					MKA670
CANH	7	HIGH-level CAN voltage
		input/output			Fig.2		Pin configuration.
Rs	8	slope resistor input

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Philips Semiconductors	Product specification
CAN controller interface	PCA82C250

FUNCTIONAL DESCRIPTION

The PCA82C250 is the interface between the CAN protocol controller and the physical bus. It is primarily intended for high-speed applications (up to 1 Mbaud) in cars. 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 a reduced power dissipation and hence a lower chip temperature. All other parts of the IC will remain in operation. The thermal protection is particularly needed 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 or 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 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 1 Truth table of the CAN transceiver

SUPPLY				TXD	CANH	CANL		BUS STATE		RXD
4.5 to 5.5 V				0	HIGH	LOW		dominant		0
4.5 to 5.5 V				1 (or floating)	floating	floating		recessive		1
<2 V (not powered)				X(1)	floating	floating		recessive		X(1)
2 V < V	CC	< 4.5 V		>0.75V	floating	floating		recessive		X(1)
				CC
2 V < VCC < 4.5 V				X(1)	floating if	floating if		recessive		X(1)
					VRs > 0.75VCC	VRs > 0.75VCC
Note
1. X = don’t care.
Table 2 Pin Rs summary
CONDITION FORCED AT PIN Rs					MODE	RESULTING VOLTAGE OR CURRENT AT PIN Rs
		VRs > 0.75VCC			standby			IRs < ï10 mAï
	-10 mA < IRs < -200 mA				slope control		0.4VCC < VRs < 0.6VCC
		VRs < 0.3VCC			high-speed			IRs < -500 mA

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Philips Semiconductors	Product specification
CAN controller interface	PCA82C250

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 60134); all voltages are referenced to pin 2; positive input current.

SYMBOL	PARAMETER	CONDITIONS	MIN.	MAX.	UNIT
VCC	supply voltage		−0.3	+9.0	V
Vn	DC voltage at pins 1, 4, 5 and 8		−0.3	VCC + 0.3	V
V6, 7	DC voltage at pins 6 and 7	0 V < VCC < 5.5 V;	−8.0	+18.0	V
		no time limit
Vtrt	transient voltage at pins 6 and 7	see Fig.8	−150	+100	V
Tstg	storage temperature		−55	+150	°C
Tamb	ambient temperature		−40	+125	°C
Tvj	virtual junction temperature	note 1	−40	+150	°C
Vesd	electrostatic discharge voltage	note 2	−2000	+2000	V
		note 3	−200	+200	V

Notes

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 Ω; V = ±2000 V.

3.Classification B: machine model; C = 200 pF; R = 25 Ω; V = ±200 V.

THERMAL CHARACTERISTICS

SYMBOL	PARAMETER	CONDITIONS	VALUE	UNIT
Rth(j-a)	thermal resistance from junction to ambient	in free air
	PCA82C250		100	K/W
	PCA82C250T		160	K/W

QUALITY SPECIFICATION

According to “SNW-FQ-611 part E”.

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Philips Semiconductors	Product specification
CAN controller interface	PCA82C250

CHARACTERISTICS

VCC = 4.5 to 5.5 V; Tamb = -40 to +125 °C; RL = 60 W; I8 > -10 mA; 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	CONDITIONS	MIN.	TYP.	MAX.	UNIT
Supply
I3	supply current	dominant; V1 = 1 V	-	-	70	mA
		recessive; V1 = 4 V;	-	-	14	mA
		R8 = 47 kW
		recessive; V1 = 4 V;	-	-	18	mA
		V8 = 1 V
		standby; Tamb < 90 °C;	-	100	170	mA
		note 1
DC bus transmitter
VIH	HIGH-level input voltage	output recessive	0.7VCC	-	VCC + 0.3	V
VIL	LOW-level input voltage	output dominant	-0.3	-	0.3VCC	V
IIH	HIGH-level input current	V1 = 4 V	-200	-	+30	mA
IIL	LOW-level input current	V1 = 1 V	-100	-	-600	mA
V6,7	recessive bus voltage	V1 = 4 V; no load	2.0	-	3.0	V
ILO	off-state output leakage current	-2 V < (V6,V7) < 7 V	-2	-	+1	mA
		-5 V < (V6,V7) < 18 V	-5	-	+12	mA
V7	CANH output voltage	V1 = 1 V	2.75	-	4.5	V
V6	CANL output voltage	V1 = 1 V	0.5	-	2.25	V
DV6, 7	difference between output	V1 = 1 V	1.5	-	3.0	V
	voltage at pins 6 and 7	V1 = 1 V; RL = 45 W;	1.5	-	-	V
		VCC ³ 4.9 V
		V1 = 4 V; no load	-500	-	+50	mV
Isc7	short-circuit CANH current	V7 = -5 V; VCC £ 5 V	-	-	-105	mA
		V7 = -5 V; VCC = 5.5 V	-	-	-120	mA
Isc6	short-circuit CANL current	V6 = 18 V	-	-	160	mA

DC bus receiver: V1 = 4 V; pins 6 and 7 externally driven; -2 V < (V6, V7) < 7 V; unless otherwise specified

Vdiff(r)	differential input voltage			-1.0	-	+0.5	V
	(recessive)	-7 V < (V6, V7) < 12 V;		-1.0	-	+0.4	V
		not standby mode
Vdiff(d)	differential input voltage			0.9	-	5.0	V
	(dominant)	-7 V < (V6, V7) < 12 V;		1.0	-	5.0	V
		not standby mode
Vdiff(hys)	differential input hysteresis	see Fig.5		-	150	-	mV
VOH	HIGH-level output voltage	I4	= -100 mA	0.8VCC	-	VCC	V
	(pin 4)
VOL	LOW-level output voltage (pin 4)	I4	= 1 mA	0	-	0.2VCC	V
		I4	= 10 mA	0	-	1.5	V
Ri	CANH, CANL input resistance			5	-	25	kW

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