Philips AU5790D14, AU5790D Datasheet

INTEGRATED CIRCUITS

AU5790

Single wire CAN transceiver

Product data

2001 May 18

Supersedes data of 2001 Jan 31

IC18 Data Handbook

P s

on o s

Philips Semiconductors	Product data
Single wire CAN transceiver	AU5790

FEATURES

•Supports in-vehicle class B multiplexing via a single bus line with ground return

•33 kbps CAN bus speed with loading as per J2411

•83 kbps high-speed transmission mode

•Low RFI due to output waveshaping

•Direct battery operation with protection against load dump, jump start and transients

•Bus terminal protected against short-circuits and transients in the automotive environment

•Built-in loss of ground protection

•Thermal overload protection

•Supports communication between control units even when network in low-power state

•70 μA typical power consumption in sleep mode

•8- and 14-pin small outline packages

•±8 kV ESD protection on bus and battery pins

DESCRIPTION

The AU5790 is a line transceiver, primarily intended for in-vehicle multiplex applications. The device provides an interface between a

CAN data link controller and a single wire physical bus line. The achievable bus speed is primarily a function of the network time constant and bit timing, e.g., up to 33.3 kbps with a network including 32 bus nodes. The AU5790 provides advanced sleep/wake-up functions to minimize power consumption when a vehicle is parked, while offering the desired control functions of the network at the same time. Fast transfer of larger blocks of data is supported using the high-speed data transmission mode.

QUICK REFERENCE DATA

SYMBOL	PARAMETER	CONDITIONS	MIN.	TYP.	MAX.	UNIT
VBAT	Operating supply voltage		5.3	13	27	V
Tamb	Operating ambient temperature range		±40		+125	°C
VBATld	Battery voltage	load dump; 1s			+40	V
VCANHN	Bus output voltage		3.65		4.55	V
VT	Bus input threshold		1.8		2.2	V
tTrN	Bus output delay, rising edge		3		6.3	μs
tTfN	Bus output delay, falling edge		3		9	μs
tDN	Bus input delay		0.3		1	μs
IBATS	Sleep mode supply current			70	100	μA

ORDERING INFORMATION

DESCRIPTION	TEMPERATURE RANGE	ORDER CODE	DWG #
SO8: 8-pin plastic small outline package	±40 °C to +125 °C	AU5790D	SOT96±1
SO14: 14-pin plastic small outline package	±40 °C to +125 °C	AU5790D14	SOT108±1

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853-2237 26343

Philips Semiconductors	Product data
Single wire CAN transceiver	AU5790

BLOCK DIAGRAM

	BATTERY (+12V)
	BAT
	1
	VOLTAGE	TEMP.
	REFERENCE	PROTECTION
				CANH
TxD		OUTPUT	7	(BUS)
		BUFFER
NSTB	3
(Mode 0)
	MODE
	CONTROL	BUS
EN	6	RECEIVER
(Mode 1)
				RT
RxD
	4		5
		LOSS OF
		GROUND
		PROTECTION		RTH
				(LOAD)
		AU5790
	8
	GND

SL01199

Figure 1. Block Diagram

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Philips Semiconductors	Product data
Single wire CAN transceiver	AU5790

SO8 PIN CONFIGURATION

	TxD	1					8		GND
NSTB (Mode 0)		2					7		CANH (BUS)
EN (Mode 1)					AU5790				RTH (Load)
		3					6
	RxD
		4					5		BAT
					SO8				SL01198
SO8 PIN DESCRIPTION
SYM-	PIN				DESCRIPTION
BOL
TxD	1		Transmit data input: high = transmitter passive;
			low = transmitter active
NSTB	2		Stand-by control: high = normal and
(Mode 0)			high-speed mode; low = sleep and wake-up
			mode
EN	3		Enable control: high = normal and wake-up
(Mode 1)			mode; low = sleep and high-speed mode
RxD	4		Receive data output: low = active bus condition
			detected; float/high = passive bus condition
			detected
BAT	5		Battery supply input (12 V nom.)
RTH	6		Switched ground pin: pulls the load to ground,
(LOAD)			except in case the module ground is
			disconnected
CANH	7		Bus line transmit input/output
(BUS)
GND	8		Ground

SO14 PIN CONFIGURATION

	GND	1						14		GND
	TxD	2						13		N.C.
NSTB (Mode 0)
		3						12		CANH (BUS)
EN (Mode 1)						AU5790				RTH (Load)
		4						11
										BAT
	RxD	5						10
	N.C.									N.C.
		6						9
	GND									GND
		7				SO14		8
									SL01251
SO14 PIN DESCRIPTION
SYM-	PIN					DESCRIPTION
BOL
GND	1		Ground
TxD	2		Transmit data input: high = transmitter passive;
			low = transmitter active
NSTB	3		Stand-by control: high = normal and
(Mode 0)			high-speed mode; low = sleep and wake-up
			mode
EN	4		Enable control: high = normal and wake-up
(Mode 1)			mode; low = sleep and high-speed mode
RxD	5		Receive data output: low = active bus condition
			detected; float/high = passive bus condition
			detected
N.C.	6		No connection
GND	7		Ground
GND	8		Ground
N.C.	9		No connection
BAT	10		Battery supply input (12 V nom.)
RTH	11		Switched ground pin: pulls the load to ground,
(LOAD)			except in case the module ground is
			disconnected
CANH	12		Bus line transmit input/output
(BUS)
N.C.	13		No connection
GND	14		Ground

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Philips Semiconductors	Product data
Single wire CAN transceiver	AU5790

FUNCTIONAL DESCRIPTION

The AU5790 is an integrated line transceiver IC that interfaces a CAN protocol controller to the vehicle's multiplexed bus line. It is primarily intended for automotive ªClass Bº multiplexing applications in passenger cars using a single wire bus line with ground return. The achievable bit rate is primarily a function of the network time constant and the bit timing parameters. For example, the maximum bus speed is 33 kpbs with bus loading as specified in J2411 for a full

32 node bus, while 41.6 kbps at is possible with modified bus loading. The AU5790 also supports low-power sleep mode to help meet ignition-off current draw requirements.

The protocol controller feeds the transmit data stream to the transceiver's TxD input. The AU5790 transceiver converts the TxD data input to a bus signal with controlled slew rate and waveshaping to minimize emissions. The bus output signal is transmitted via the CANH in/output, connected to the physical bus line. If TxD is low, then a typical voltage of 4 V is output at the CANH pin. If TxD is high then the CANH output is pulled passive low via the local bus load resistance RT. To provide protection against a disconnection of the module ground, the resistor RT is connected to the RTH pin of the AU5790. By providing this switched ground pin, no current can flow from the floating module ground to the bus. The bus receiver detects the data stream on the bus line. The data signal is output at the RxD pin being connected to a CAN controller. The AU5790 provides appropriate filtering to ensure low susceptibility against electromagnetic interference. Further enhancement is possible with applying an external capacitor between CANH and ground potential.

The device features low bus output leakage current at power supply failure situations.

If the NSTB and EN control inputs are pulled low or floating, the

AU5790 enters a low-power or ªsleepº mode. This mode is dedicated to minimizing ignition-off current drain, to enhance system efficiency. In sleep mode, the bus transmit function is disabled, e.g. the CANH output is inactive even when TxD is pulled low. An internal network active detector monitors the bus for any occurrence

of signal edges on the bus line. If such edges are detected, this will be signalled to the CAN controller via the RxD output. Normal transmission mode will be entered again upon a high level being applied to the NSTB and EN control inputs. These signals are typically being provided by a controller device.

Sleeping bus nodes will generally ignore normal communication on the bus. They should be activated using the dedicated wake-up mode. When NSTB is low and EN is high the AU5790 enters wake-up mode i.e. it sends data with an increased signal level. This will result in an activation of other bus nodes being attached to the network.

The AU5790 also provides a high-speed transmission mode supporting bit rates up to 100 kbps. If the NSTB input is pulled high and the EN input is low, then the internal waveshaping function is disabled, i.e. the bus driver is turned on and off as fast as possible to support high-speed transmission of data. Consequently, the EMC performance is degraded in this mode compared to the normal transmission mode. In high-speed transmission mode the AU5790 supports the same bus signal level as specified for the CANH output in normal mode.

The AU5790 features special robustness at its BAT and CANH pins.

Hence the device is well suited for applications in the automotive environment. The BAT input is protected against 40 V load dump and jump start condition. The CANH output is protected against wiring fault conditions, e.g., short circuit to ground or battery voltage, as well as typical automotive transients. In addition, an over-temperature shutdown function with hysteresis is incorporated protecting the device under system fault conditions. In case of the chip temperature reaching the trip point, the AU5790 will latch-off the transmit function. The transmit function is available again after a small decrease of the chip temperature. The AU5790 contains a power-on reset circuit. For Vbat < 2.5 V, the CANH output drive will be turned off, the output will be passive, and RxD will be high. For

2.5 V < Vbat < 5.3 V, the CANH output drive may operate normally or be turned off.

Table 1. Control Input Summary

NSTB	EN	TxD	Description			CANH	RxD
0	0	Don't Care	Sleep mode	0	V		float (high)
0	1	Tx-data	Wake-up transmission mode	0	V, 12 V		bus state1
1	0	Tx-data	High-speed transmission mode	0	V, 4	V	bus state1
1	1	Tx-data	Normal transmission mode	0	V, 4	V	bus state1

NOTE:

1.RxD outputs the bus state. If the bus level is below the receiver threshold (i.e., all transmitters passive), then RxD will be floating (i.e., high, considering external pull-up resistance). Otherwise, if the bus level is above the receiver threshold (i.e., at least one transmitter is active), then RxD will be low.

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Philips Semiconductors	Product data
Single wire CAN transceiver	AU5790

ABSOLUTE MAXIMUM RATINGS

According to the IEC 134 Absolute Maximum System: operation is not guaranteed under these conditions; all voltages are referenced to pin 8 (GND); positive currents flow into the IC, unless otherwise specified.

SYMBOL	PARAMETER	CONDITIONS	MIN.	MAX.	UNIT
VBAT	Supply voltage	Steady state	±0.3	+27	V
VBATld	Short-term supply voltage	Load dump; ISO7637/1 test pulse 5		+40	V
		(SAE J1113, test pulse 5), T < 1s
VBATtr2	Transient supply voltage	ISO 7637/1 test pulse 2 (SAE J1113,		+100	V
		test pulse 2), with series diode and
		bypass cap of 100 nF between BAT and
		GND pins, Note 2.
VBATtr3	Transient supply voltage	ISO 7637/1 pulses 3a and 3b	±150	+100	V
		(SAE J1113 test pulse 3a and 3b),
		Note 2.
V	CANH voltage	VBAT > 2 V	±10	+18	V
CANH_1
V	CANH voltage	VBAT < 2 V	±16	+18	V
CANH_0
VCANHtr1	Transient bus voltage	ISO 7637/1 test pulse 1, Notes 1 and 2	±100		V
VCANHtr2	Transient bus voltage	ISO 7637/1 test pulse 2, Notes 1 and 2		+100	V
VCANHtr3	Transient bus voltage	ISO 7637/1 test pulses 3a, 3b,	±150	+100	V
		Notes 1 and 2
VRTH1	Pin RTH voltage	VBAT > 2 V, voltage applied to pin RTH	±10	+18	V
		via a 2 kΩ series resistor
VRTH0	Pin RTH voltage	VBAT < 2 V, voltage applied to pin RTH	±16	+18	V
		via a 2 kΩ series resistor
VI	DC voltage on pins TxD, EN, RxD, NSTB		±0.3	+7	V
ESDBAHB	ESD capability of pin BAT	Direct contact discharge,	±8	+8	kV
		R=1.5 kΩ, C=100 pF
ESDCHHB	ESD capability of pin CANH	Direct contact discharge,	±8	+8	kV
		R=1.5 kΩ, C=100 pF
ESDRTHB	ESD capability of pin RTH	Direct contact discharge,	±8	+8	kV
		R=1.5 kΩ + 3 kΩ, C=100 pF
ESDLGHB	ESD capability of pins TxD, NSTB, EN, RxD, and	Direct contact discharge,	±2	+2	kV
	RTH	R=1.5 kΩ , C=100 pF
RTmin	Bus load resistance RT being connected to pin		2		kΩ
	RTH
Tamb	Operating ambient temperature		±40	+125	°
					C
Tstg	Storage temperature		±40	+150	°C
Tvj	Junction temperature		±40	+150	°C

NOTES:

1.Test pulses are coupled to CANH through a series capacitance of 1 nF.

2.Rise time for test pulse 1: tr < 1 μs; pulse 2: tr < 100 ns; pulses 3a/3b: tr < 5 ns.

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