Philips AU5790D14, AU5790D Datasheet

INTEGRATED CIRCUITS

AU5790

Single wire CAN transceiver

Product data Supersedes data of 2001 Jan 31 IC18 Data Handbook

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2001 May 18

Philips Semiconductors Product data

AU5790Single wire CAN transceiver

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

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.

•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

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

BAT

amb

BATld

CANHN

TrN

TfN

BATS

Operating supply voltage 5.3 13 27 V Operating ambient temperature range –40 +125 °C Battery voltage load dump; 1s +40 V Bus output voltage 3.65 4.55 V Bus input threshold 1.8 2.2 V Bus output delay, rising edge 3 6.3 µs Bus output delay, falling edge 3 9 µs Bus input delay 0.3 1 µs 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

2001 May 18 853-2237 26343

Philips Semiconductors Product data

AU5790Single wire CAN transceiver

BLOCK DIAGRAM

BATTERY (+12V)

BAT

TxD

NSTB

(Mode 0)

(Mode 1)

RxD

VOLTAGE

REFERENCE

MODE

CONTROL

TEMP.

PROTECTION

OUTPUT BUFFER

BUS

RECEIVER

LOSS OF

GROUND

PROTECTION

CANH (BUS)

RTH (LOAD)

2001 May 18

AU5790

GND

SL01199

Figure 1. Block Diagram

Philips Semiconductors Product data

AU5790Single wire CAN transceiver

SO8 PIN CONFIGURA TION

TxD

NSTB (Mode 0)

GND

CANH (BUS)

AU5790

EN (Mode 1)

RxD

SO8

RTH (Load)

BAT

SL01198

SO8 PIN DESCRIPTION

SYM-

BOL

TxD 1 Transmit data input: high = transmitter passive;

NSTB (Mode 0)

EN (Mode 1)

RxD 4 Receive data output: low = active bus condition

BAT 5 Battery supply input (12 V nom.) RTH

(LOAD)

CANH (BUS)

GND 8 Ground

PIN DESCRIPTION

low = transmitter active

2 Stand-by control: high = normal and

high-speed mode; low = sleep and wake-up mode

3 Enable control: high = normal and wake-up

mode; low = sleep and high-speed mode

detected; float/high = passive bus condition detected

6 Switched ground pin: pulls the load to ground,

except in case the module ground is disconnected

7 Bus line transmit input/output

SO14 PIN CONFIGURATION

GND

TxD

NSTB (Mode 0)

EN (Mode 1)

RxD

N.C.

GND

AU5790

SO14

GND

N.C.

CANH (BUS)

RTH (Load)

BAT

N.C.

GND

SL01251

SO14 PIN DESCRIPTION

SYM-

BOL

GND 1 Ground TxD 2 Transmit data input: high = transmitter passive;

NSTB (Mode 0)

EN (Mode 1)

RxD 5 Receive data output: low = active bus condition

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

(LOAD)

CANH

(BUS)

N.C. 13 No connection GND 14 Ground

PIN DESCRIPTION

low = transmitter active

3 Stand-by control: high = normal and

high-speed mode; low = sleep and wake-up mode

4 Enable control: high = normal and wake-up

mode; low = sleep and high-speed mode

detected; float/high = passive bus condition detected

11 Switched ground pin: pulls the load to ground,

except in case the module ground is disconnected

12 Bus line transmit input/output

2001 May 18

Philips Semiconductors Product data

AU5790Single wire CAN transceiver

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 “Class B” 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 R module ground, the resistor R 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 “sleep” 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

. To provide protection against a disconnection of the

is connected to the RTH pin of the

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 BA T 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 V

< 2.5 V, the CANH output drive will

bat

be turned off, the output will be passive, and RxD will be high. For

2.5 V < V

< 5.3 V, the CANH output drive may operate normally or

bat

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 state 1 0 Tx-data High-speed transmission mode 0 V, 4 V bus state 1 1 Tx-data Normal transmission mode 0 V, 4 V bus state

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.

2001 May 18

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Philips Semiconductors Product data

AU5790Single wire CAN transceiver

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

BAT

BATld

BATtr2

BATtr3

CANH_1

CANH_0

CANHtr1

CANHtr2

CANHtr3

RTH1

RTH0

ESD

BAHB

ESD

CHHB

ESD

RTHB

ESD

LGHB

Tmin

amb

stg

Supply voltage Steady state –0.3 +27 V Short-term supply voltage Load dump; ISO7637/1 test pulse 5

Transient supply voltage ISO 7637/1 test pulse 2 (SAE J1113,

Transient supply voltage ISO 7637/1 pulses 3a and 3b

CANH voltage V CANH voltage V Transient bus voltage ISO 7637/1 test pulse 1, Notes 1 and 2 –100 V Transient bus voltage ISO 7637/1 test pulse 2, Notes 1 and 2 +100 V Transient bus voltage ISO 7637/1 test pulses 3a, 3b,

Pin RTH voltage V

DC voltage on pins TxD, EN, RxD, NSTB –0.3 +7 V ESD capability of pin BAT Direct contact discharge,

ESD capability of pin CANH Direct contact discharge,

ESD capability of pin RTH Direct contact discharge,

ESD capability of pins TxD, NSTB, EN, RxD, and RTH

Bus load resistance RT being connected to pin RTH

Operating ambient temperature –40 +125 Storage temperature –40 +150 °C 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: t

PARAMETER CONDITIONS MIN. MAX. UNIT

+40 V

(SAE J1113, test pulse 5), T < 1s

+100 V test pulse 2), with series diode and bypass cap of 100 nF between BAT and GND pins, Note 2.

–150 +100 V (SAE J1113 test pulse 3a and 3b), Note 2.

> 2 V –10 +18 V

BAT

< 2 V –16 +18 V

BAT

–150 +100 V Notes 1 and 2

> 2 V, voltage applied to pin RTH

BAT

via a 2 kΩ series resistor

< 2 V, voltage applied to pin RTH

BAT

via a 2 kΩ series resistor

–10 +18 V

–16 +18 V

–8 +8 kV

R=1.5 kΩ, C=100 pF

–8 +8 kV

R=1.5 kΩ, C=100 pF

–8 +8 kV

R=1.5 kΩ + 3 kΩ, C=100 pF Direct contact discharge,

–2 +2 kV

R=1.5 kΩ , C=100 pF

2 kΩ

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

°C

2001 May 18

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