Datasheet L9669 Datasheet (SGS Thomson Microelectronics)

FAULT TOLERANT CAN TRANSCEIVER

■ FAULT TOLERANT DIFFERENTIAL

CAN TRANSCEIVER

■ OPERATING SUPPLY VO LT AG E 6V TO 28V,

TRANSIENTS UP TO 40V

■ LOW QUIESCENT CURRENT IN STANDBY

MODE (100

■ ON CHIP DIAGNOSIS FO R ERRORS ON THE

PHYSICAL BUSLINES WITH MICRO
CONTROLLER INTERFACE

■

OPTIMIZED EMI BEHAVIOUR DUE TO LIMITED
AND SYMM ETRIC SLOPES OF CAN SIGNALS

■ AUTOMATIC SWITCHING TO SINGLE WIRE

MODE UPON BUS FAILURES

■ TWO-EDGE SENSITIVE WAKE-UP PIN

■ SUPPORTS TRANSMISS ION WITH G ROUND

SHIFT VOLTAGES:
SINGLE WIRE: 1.5V
DIFFERENTIAL WIRE: 3v

■ AN UNPOWERED NODE OR UNSUFFICIENT

µA) AND SLEEP MOD E (37 µ A)

L9669

SO14

ORDERING NUMBER: L9669

SUPPLIES DO NOT DISTURB THE BUS
LINES

DESCRIPTION

The L9669 is an integrated circuit which contains a
CAN physical line interface. It integrates all main lo­cal functions for automotive body electronic applica­tions connected to a CAN bus.

Figure 1. Block Diagram

KL30
(+12V)

5Vint

75k

7

WAKE

VCC

12.5k

2

TXD

5

NSTB

6

EN

99AT0001

Wake-up

Control

Low

Power

Control

100k100k

INHVS

14 1

TXD

Control

Receiver

Error

Management

& Diagnosis

Voltage

Regulator

13

GND

CANH
Driver

CANH
Driver

+5V

VCC

10

Filter

CANH T ermination

CANL T ermination

CANH

11
12

CANL

R

RTH

3

RXD

8

RTH

9

RTL

4

NERR

R

RTL

CAN
BUSLINE

July 2003

1/13

L9669

Figure 2. Pin Connection top view.

INH

TXD

RXD

NERR

NSTB

EN

WAKE

99AT0002

1
2
3
4
5
6
7

Table 1. Pin Functions

N° Pin Function

1INH
2TXD
3RXD
4NERR
5NSTB

Inhibit Output
Transmit Data Input
Receive Data Output
Error/Diagnostic Output
Not Standby Input

- for switching external 5V Regulator

- active LOW dominant Bit transmission

- active LOW dominant Bit reception

- Digital control signal for low power modes

- active LOW error/Wake-up and Diagnostic output

14
13
12
11
10

VS
GND
CANL
CANH
VCC

9

RTL

8

RTH

6EN

7 WAKE

8RTH

9RTL
10 VCC
11 CANH
12 CANL
13 GND Ground
14 VS

Enable Input/Diagnostic Clock

Digital control signal for low power modes/Diagnostic clock

Wake-Up Input

switching INH to VS

Termination Resistor for CANH
Termination Resistor for CANL
Supply Voltage Input
High Voltage Bus Line
Low Voltage Bus Line

Battery Voltage Input

- If level of V

- +5V

- High: dominant state

- Low: dominant state

- +12V

-

changes the device initiates a wake-up from sleep mode by

WAKE

- controlled by internal error management

- controlled by internal error management

Table 2. Thermal Data

Symbol Parameter Value Unit

R

thj-amb

Thermal resistance junction to ambient 120 °C/W

2/13

Table 3. Absolute Maximum Ratings

For externally applied voltages or currents exceeding these limits damage of the circuit may occur!

Symbol Parameter Value Unit

L9669

V

S-DC

V

S-P

V

CC

V

CANH,L-DC

V

V

WAKE

T

STG

T

Notes: 1. All pins of t he IC are pr otected aga inst ESD. T he verifica tion is perfor med accord ing to MIL 883C, hu man body mo del with

2. Voltage forced means voltage l i m i ted to spec i fied values while current is not l i m i ted. Current force d m eans voltage unlimi t ed but

DC operating battery voltage -0.3 to +28 V
Pulse operating battery voltage (t<400ms) -0.3 to +40 V
Supply voltage -0.3 to +6 V
DC voltage CANH, CANL -28 to +40 V
Voltage TXD, RXD, NERR, NSTB, EN -0.3 to VCC+0.3 V

X

Voltage WAKE -0.3 to VS+0.3 V
Storage temperature -55 to +150

Operating junction temperature -40 to +150

j

R = 1.5kΩ, C = 100pF and discharge vol t age ±2kV, corresponding to a m aximum discharge energy of 0.2mJ.
current li m i ted to specified value.

o

C

o

C

Table 4. Electrical Characteristcs

VCC= 4.75V to 5.25V, VS= 6V to 28V, Tj=-40°C to 150°C unless otherwise specified.

Item Symbol Parameter Test Condition Min. Typ. Max. Unit

1 Supplies

1.1 I

SSL

Supply current in sleep mode

= IVS)

(I

SSL

V

= 0V, VS = 14V 37 65 µA

CC

1.2 I

1.3 I

SSB

SND

Supply current in standby mode

= IVS + I

(I

SSB

Supply current in normal mode
(I

SND

2 CAN Line Interface

2.1 V

Differential receiver recessive to

r-d

dominant threshold
V

CANH

2.2 V

Differential receiver dominant to

d-r

recessive threshold
V

CANH

2.3 V

2.4 V

2.5 V

CANHr

CANHd

CANLr

CANH recessive output voltage V

CANH dominant output voltage V

CANL recessive output voltage V

= IVS + I

- V

CANL

- V

CANL

VCC

VCC

I

= 0 110 160 µA

INH

)

V

= 14V, V

)

S

(dominant state)

TXD

= 0

27 mA

no load at CAN

No bus errors.

= 5V

V

CC

No bus errors.

= 5V

V

CC

= V

TXD
RTH

TXD

TXD
RTH

CC

< 4kΩ

= 0V

= -40mA

= V

CC

< 4kΩ

R

I

CANH

R

-3.50 -2.20 V

-3.85 -2.5 V

0.35 V

VCC-

1.4

VCC-

0.2

V

V

3/13

L9669

Table 4. Electrical Characteristcs (continued)

VCC= 4.75V to 5.25V, VS= 6V to 28V, Tj=-40°C to 150°C unless otherwise specified.

Item Symbol Parameter Test Condition Min. Typ. Max. Unit

2.6 V

2.7 I

2.8 I

2.9 I

2.10 I

2.11

V

2.12

2.13 V

2.14 V

2.15

CANLd

CANH

CANL

CANHl

CANLl

CANHWK

V

CANLWK

CANHs

CANLs

V

CANHOV

CANL dominant output voltage V

CANH output current V

CANL output current V

CANH leakage current V

TXD

I

CANL

CANH

V

TXD

CANL

V

TXD

CANH

= 0V

= 40mA

= 0V

= 0V

= 5V

= 0V

= 14V

1.4 V

-160 -110 -70 mA

70 110 160 mA

0 µA

Sleep mode.

CANL leakage current V

CANL

= 0V

0 µA

Sleep mode.

CANH wake-up voltage Sleep/standby mode. 1.2 1.9 2.7 V

CANL wake-up voltage Sleep/standby mode. 2.4 3.1 3.8 V

CANH single ended receiver
threshold

CANL single ended receiver
threshold

CANH overvoltage detection
threshold

Normal mode.

= 5V

V

CC

Normal mode.

= 5V

V

CC

Normal mode.

= 5V

V

CC

1.5 1.8 2.15 V

2.7 3.1 3.4 V

7.2 V

2.16 V

CANLOV

2.17 t

2.18 t

2.19 t

2.20 t

2.21 t

wuCAN

2.22 t

drd

ddr

r,f

r,f

wuWK

CANL overvoltage detection
threshold

Propagation delay
TXD to RXD
recessive to dominant

Propagation delay
TXD to RXD
recessive to dominant

CANH, CANL output
rise/fall time
dominant to recessive

CANH, CANL output
rise/fall time
dominant to recessive

Minimum dominant time for
wake-up on CANH or CANL

Minimum pulse time for
wake-up on WAKE

Normal mode.

= 5V

V

CC

10% to 90%

= C2 = 3.3nF

C

1

7.2 V

1 1.6 µs

R1 = 100Ω

10% to 90%

= C2 = 3.3nF

C

1

2.2 µs

R1 = 100Ω

10% to 90%

= C2 = 3.3nF

C

1

0.6 1.5 µs

R1 = 100Ω

10% to 90%

= C2 = 3.3nF

C

1

2.6 6 µs

R1 = 100Ω

Sleep/standby mode. 8 44 µs

Sleep/standby mode 4 44 µs

4/13

Table 4. Electrical Characteristcs (continued)
VCC= 4.75V to 5.25V, VS= 6V to 28V, Tj=-40°C to 150°C unless otherwise specified.

Item Symbol Parameter Test Condition Min. Typ. Max. Unit

3 Termination RTH, RTL

L9669

3.1 R

3.2 I

3.3 R

3.4 I

3.5 R

3.6 V

3.7 R

RTH

RTH

RTL

RTL

RTL-VS

RTH

RTH,

RTL

4 Input TXD

4.1 V

TXDh

Internal RTHto GND
switch-on resistance

Internal RTHto GND
pull down current

Internal RTLto VCC
switch-on resistance

Internal RTLto VCC
pull up current

Internal RTLto VS
termination resistance

Normal mode.
No errors.

= 1V

V

RTH

Normal mode.
Error 3.

= 1V

V

RTH

Normal mode.
No errors.

= VCC - 1V

V

RTL

Normal mode.
Error 4, 6 or 7.

= VCC - 1.5V

V

RTL

Sleep/standby mode.

= 1V, 5V

V

RTL

81326kΩ

RTH output voltage Sleep/stan dby mode

= 1mA

I

RTH

External termination resistance 0.5 16 kΩ

TXD high level input voltage VCC-

45 Ω

75 µA

45 Ω

-75 µA

1V

V

CC

0.9

V

4.2 V

4.3 I

4.4 I

TXDl

TXDh

TXDl

TXD low level input voltage 0 0.9 V

TXD high level input current V

TXD low level input current V

5 Outputs RXD, NERR

5.1 V

5.2 V

High level output voltage VCC-

Xh

Low level output voltage 0 0.9 V

Xl

6 Output INH

6.1 V

6.2 I

dropI

High level voltage drop

= VS - V

(V

dropI

Leakage current V

Il

INH

= 4 V -200 -25 µA

TXD

= 1 V -800 -100 µA

TXD

V

CC

V

0.9

I

= -0.18mA

)

INH

Not sleep mode.

= 0V

INH

-5 5 µA

1V

Sleep mode.

5/13

L9669

Table 4. Electrical Characteristcs (continued)

VCC= 4.75V to 5.25V, VS= 6V to 28V, Tj=-40°C to 150°C unless otherwise specified.

Item Symbol Parameter Test Condition Min. Typ. Max. Unit

7 Inputs NSTB, EN

7.1 V

7.2 V

7.3 I

7.4 I

High level input voltage VCC-

Xh

Low level input voltage 0 0.9 V

Xl

High level input current VX = 4 V 10 150 µA

Xh

Low level input current VX = 1 V 2 40 µA

Xl

8 Input WAKE

8.1 V

8.2 V

WAKEh

WAKEl

WAKE high level input voltage 3 V

WAKE low level input voltage 0 0.9 V

9 Thermal shutdown

9.1 T

Shutdown junction temperature 170 °C

jsd

10 CAN Error detection

10.1 t

10.2 t

10.3 t

fail38d

fail46710d

fail38r

Error 3, 8 detection time Normal/RXonly mode. 1.6 3.6 ms

Error 4, 6, 7, 10 detection time Normal/RXonly mode. 0.4 1.6 ms

Error 3, 8 recovery time Normal/RXonly mode. 0.4 1.6 ms

0.9

V

CC

S

V

V

10.4 t

10.5 t

10.6 t

10.7 t

10.8 t

10.9 t

10.10 N

10.11 N

10.12 t

10.13 t

6/13

fail47r

fail6r

fail10r

fail38ds

fail4rs

fail348rs

edge-d

edge-r

Dmax

Hmin

Error 4, 7 recovery time Normal/RXonly mode. 10 50 µs

Error 6 recovery time Normal/RXonly mode. 0.2 0.75 ms

Error 10 recovery time Normal/RXonly mode. 0.7 4 µs

Error 3, 8 detection time Sleep/standby mode. 1.6 3.6 ms

Error 4 recovery time Sleep/standby mode. 0.4 1.6 ms

Error 3, 4, 8 recovery time Sleep/standby mode. 0.4 1.6 ms

Edge count difference between
CANH and CANL for detection

Edge count difference between
CANH and CANL for recovery

Normal/RXonly mode.
Error 1, 2, 5 or 9.

Normal/RXonly mode.
Error 1, 2, 5 or 9.

3 Edges

3 Edges

Diagnostic timeout 15 80 µs

minimum hold time

80 µs

go to sleep

L9669

1. FUNCTIONAL DESCRIPTION

The L9669 is a monolithic integrated circuit which provides all main functions for an automotive body CAN sys­tem. The device guarantees a clearly defined behavior in case of failure to avoid permanent CAN bus errors. It
is primarily intended for low speed applications in passenger cars.

1.1 Transceiver

– Supports double wire unshielded busses
– Baud rates up to 125 kBaud
– Single wire operation possible (automatic switching to single wire upon bus failures)
– Bus not loaded in case of unpowered transceiver

The CAN transceiver st age is able to t ransfer ser ial data on two independ ent communi cation w ires e ither differ­entially (normal operation) or in case of a single wire fault on the remaining line. The physical bitcoding is done
using dominant (transmitter active) and overwritable recessive states. Too long dominant phases are detected
internally and further transmission is automatically disabled (malfunction of protocol unit does not affect com­munication on the bus (“fail safe mechanism”)).

1.2 Modes of Operation

Five different functional modes exist to enable or establish the usage of low power or receive only operation.

NSTB EN Mode INH NERR RXD RTL

0 0 standby VS
0 0 sleep
0 1 “go to sleep”

floating

active LOW wake-up interrupt signal

(if VCC is present)

switched to VS

(typ. 13kΩ)

1 1 normal

RXonly

VS

10

Power on

Note: Wake-up interrupts are released when entering RXonly or normal mode.

active LOW

error flag

active LOW
VS power-on
flag if VCC is

present

HIGH=recessi ve

LOW=dominant

received data

active LOW

wake-up interrupt

signal if VCC is

present

switched to VCC

switched to VS

The following state diagr am sh ows these modes and the po ssibl e state i nter actions depending on the input sig­nals NSTB and EN.

7/13

L9669

Figure 3.

NSTB = 1

EN = 0

NSTB = 0

EN = 0

Standby Mode

NSTB EN INH

00VS

NSTB = 0

EN = 1

NSTB = 1

EN = 0

NSTB = 0

EN = 0

NSTB = 1

EN = 1

Power on

Mode

RX only

Mode

NSTB EN INH

10

99AT0003

VS

NSTB = 0

EN = 1

"Go to Sleep" Mode

NSTB EN INH

0 1 Float.

NSTB = 0

EN = 0

Sleep Mode

NSTB EN INH

0 0 Float.

NSTB = 0

EN = 1

Normal Mode

NSTB EN INH

11VS

Wake-up

8/13

L9669

1.3 Error Mana g em e nt

Ten different errors on the physical buslines can be distinguished:

N Type of Errors

Errors caused by damage of the datalines or isolation

1 CANH wire interrupted (floating or tied to termination) 0 0
2 CANL wire interrupted (floating or tied to termination) 0 0
3 CANH short circuit to VS (overvoltage condition) 1 1
4 CANL short circuit to GND (permanently dominant) 2 0
5 CANH short circuit to GND (permanently recessive) 0 2
6 CANL short circuit to VS (overvoltage condition) 1 1
7 CANL shorted to CANH 2 2

Errors caused by misbehaviour of transceiver stage

8 CANH short circuit to VCC (permanently dominant) 2 0
9 CANL short circuit to VCC (permanently recessive) 0 2

Errors caused by defective protocol unit

10 CANH, CANL driven dominant for more than 1.3 ms 2 2

Not all of these errors leads to a breakdown of the whole communication. S o the errors can be categorized into
“negligible” (severity 0), “problematic” (severity 1) and “severe” (severity 2).

Severity

RX TX

Negligible Errors
Transmitter

Error 1, 2, 4 or 8: In all cases data still can be transmitted in differential mode.

Receiver

Error 1, 2, 5 or 9: In all cases data still can be received in differential mode.

Prob le m a t ic Erro rs
Transmitter

Error 3 or 6: Data are transmitted using the remaining dataline (single wire).

Receiver

Error 3 or 6: Data are received using the remaining dataline (single wire).

Severe Errors
Transmitter

Error 5 or 9: Data are transmitted using the remaining dataline after short circuit detection.
Error 7: Data are transmitted on CANH or CANL after overcurrent was detected.
Error 10: Transmission is terminated (fail safe).

Receiver

Error 7: Data are received on CANH or CANL after detection of permanent dominant state.
Error 4 or 8: Data are received on CANH or CANL after short circuit was detected.
Error 10: Data are received normally, error is detected by protocol unit.

Upon any e rror i n nor mal or RXonly mode th e NERR output w ill be forced LOW and rel eased af ter erro r recover y.

9/13

L9669

1.4 Diagn osis

A serial interface i s avai lable to retriev e diagnosti c informatio ns. Di agnostic data can be reques ted by usi ng EN
as serial clock and evaluating NERR.

Figure 4.

NSTB

EN

t

Dmax

No Bus Errors

99AT0004

Bus Error

NERR

Mode

(Example)

detected

E1

or E5E2or E9

Normal RXonly Standby

Delay between falling slope at EN and reaction at NERR: 0.7µs...3.0µs
(NERR is synchronized with internal clock).

E3 E4

Diagnosis

Readout is initialized by a negative edge on EN and acknowledged by NERR entering HIGH state. Following
the next negative edge the first error status bit is displayed on NERR according to the data table below. If no
edge on EN is detected fo r a time longer tha n t

diagnosis is disabled and oper ation c ontinuous in the mode

Dmax

given by NSTB and EN with NERR showing bus errors or wake-up correspondingly. If the clock continues, the
readout sequence starts over again with the initial bit set HIGH.

The following errors are displayable (sequence listed in chronological order):
– error status bit 1 (LSB): HIGH if Error 1 or 5
– error status bit 2: HIGH if Error 2 or 9
– error status bit 3: HIGH if Error 3
– error status bit 4: HIGH if Error 4
– error status bit 5: HIGH if Error 6
– error status bit 6: HIGH if Error 8
– error status bit 7: HIGH if Error 10
– error status bit 8: HIGH if Thermal shutdown of Transceiver

1.5 Protections

A current limiting circuit protects the transmitter outputs against short-circuit to battery, ground and shorted
wires.
If the junction temperature exceeds a maximum value, the transmitter output stages are disabled.

10/13

2. APPLICATION CIRCUIT DIAGRAM
Figure 5.

CAN
BUS
LINE

7

L9669

KL30 (+12V)

WAKE

99AT0005

RTH

8

R

RTH

CANH

11

CANL

12

R

RTL

RTL

9

CAN

Transceiver

13

GND

14

1

10

2
3
4
5
6

3. TEST CIRCUIT FOR DYNAMIC CHARACTERISTICS
Figure 6.

+5V

+14V

VS

INH

VCC

TXD
RXD
NERR
NSTB
EN

+5V

CAN

Controller

Voltage

Regulator

99AT0006

NSTB

EN

WAKE

TXD

NERR

5

6

7

2

4

20pF

INH VS

14 10

1

3

RXD GND

13

VCC

12

11

9

8

RTL

CANL

CANH

RTH

R

1

R

1

C

1

C

2

C

1

11/13

L9669

DIM.

MIN.. TYP. MAX.. MIN.. TYP.. MAX..

A 1.75 0.069
a1 0.1 0.25 0.004 0.009
a2 1.6 0.063

b 0.35 0.46 0.014 0.018
b1 0.19 0.25 0.007 0.010

C 0.5 0.020

c1 45˚ (typ.)

D (1) 8.55 8.75 0.336 0.344

E 5.8 6.2 0.228 0.244

e 1.27 0.050
e3 7.62 0.300

F (1) 3.8 4 0.150 0.157

G 4.6 5.3 0.181 0.209

L 0.4 1.27 0.016 0.050

M 0 .68 0.027

S8˚

(1) D and F do not include mold flash or protrusions. Mold flash or
potrusions shall not exceed 0.15mm (.006inch).

mm inch

(max.)

OUTLINE AND

MECHANICAL DATA

SO14

12/13

L9669

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implic ation or otherwise unde r any patent or patent rights of STMicroelectroni cs. Specifications me nt i oned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics produ ct s are not
authorized for use as crit i cal component s in l i fe support dev i ces or systems without express written approval of STMic roelectronics.

The ST logo is a registered trademark of STMicroelectronics

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13/13