Technical Data

Microelectronics

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CF150CCAN BUS TRANSCEIVER

The CF150 is a bidirectional transceiver for signal conditioning and processing in connectionwith a CAN controller. Data rates of up to 500 kBaud are supported using either shielded ornon-shielded pair of lines.

FEATURES

- CF 150 meets ISO/DIS 11898 up to 500 kBaud- Transmitter

- Generation of differential output signals- Short circuit protected from -5 V to +36 V, detection & shutdown- Slope control to reduce RFI and EMI- Two states adjustable slope control (≤500 kBaud / ≤125 kBaud)

- Receiver - Differential input with high interference suppression- Common mode input voltage range (VCOM) from -5 V to 12 V

- Package: SOIC 8

BLOCK DIAGRAM

1&

& td

≥1

1

1

Receiver

C_L

C_H

TX0

RX0

RX1

Protection

VREF

VS

VCLmax

1

A

B

ASC

Transmitter

Pin Pin3

7

6

2

1

8

4

5

1

2

3

4 5

6

7

8 ASC

C_H

C_L

RX1

TXO

B

A

RXO

PIN DESCRIPTION

Pin Name Description

1 TXO Transmitter input

2 B Ground

3 A Supply voltage

4 RXO Receive output

5 RX1 Reference voltage

6 C_L Low side bus output

7 C_H High side bus output

8 ASC Adjustable slope control

PINNING

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Page 3 of 10

MAXIMUM RATINGS

All voltages, except bus voltage, are defined with respect to pin B. Positive currents flow into the IC.

Rating Condition Symbol Min. Max. Unit

Supply voltage (A) VA -0,3 7 V

Bus voltage (C_H,C_L) 0V < VA < 5,5V VC_H, VC_L -5 36 V

Off state leakage current at C_H, C_L

0V < VA

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TRANSMITTER SECTIONRA: 60 Ω between C_H and C_L

Rating Conditions Symbol Min. Typ. Max. Unit

TXO Input capacitance VB < VTXO

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DYNAMIC CHARACTERISTICSGeneral conditions:CA: 47 pF between C_H and C_L, VA=5V, tR 0,9VIRXO=1mA-2V < VC_H < 7V-2V < VC_L < 7V

VRXO 0,5 V

Input signal threshold -2V < VC_H < 7V-2V < VC_L < 7V

VS=VC_H-VC_L

500 700 900 mV

Differential input hysteresis VHYS 100 mV

REFERENCE OUTPUT

Rating Conditions Symbol Min. Typ. Max. Unit

Reference voltage IRX1=0 VRX1 0,45VA 0,5VA

0,55VA

V

Output resistance RRX1 2 20 kΩ

Rating Conditions Symbol Min. Typ. Max. Unit

Signal delay TXO to C_H,C_L tOT 50 ns

Differential output slew rate(Transmitter)

VASC = VB SR 20 50 V/µs

VASC = VA SR 5 20 V/µs

Signal delay C_H,C_L to RXO VASC = VB tOR 150 ns

Signal delay TXO to RXO VASC = VB tOTR 300 ns

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FUNCTIONAL DESCRIPTION

The CF150 is used as an interface between a CAN controller and the physical bus. The deviceprovides transmitting capability to the CAN controller.

The transmitter outputs C_H and C_L are protected against short circuits. In case of short cir-cuit (C_H to C_L, C_H to B) the protection circuit recognizes this fault condition and the trans-mitter output stages are disabled with a delay of max. 10 µs to prevent destruction of the IC andhigh consumption of supply current IA. If VC_L > VC_Lmax the transmitter output stages wouldbe disabled immediately.

Pin ASC makes it possible to select two different modes of operation: High speed (≤500kBaud)and low speed (≤125kBaud).

The ASC pin is tied to VB for normal operation at ≤500kBaud. For slower speed operation at≤125kBaud the rise and fall slope of the bus output can be decreased to reduce EMI by con-necting the ASC pin to VA .

APPLICATION NOTE

FUNCTIONAL TABLE

TXO C_H C_L Bus State RXO

L H L Dominant L

Hor Floating

FloatingVA/2

FloatingVA/2

Recessive H

Controller

System n

System mCAN Bus

RA

RA

CF150

CF150 Controller

VBD

VBn

VBm

VAn

VAm

VCOM

VDiff

C_H

C_L

VBm

tR tR

tOT tOT

tOTR tOTR

VTXO

VDiff

VRXO

tOR

0,9V0,5V

tOR

TIMING DIAGRAM

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30Ω

30Ω

CAN CAN

CAN

Monitoring(Bit com-

6,8µF

40dB

100Ω

450Ω 50Ω

2Û

hp 8640

90%AM, 1kHz

30VSS

10VSS

20VSS

10MHz 100MHz 1GHz

CF150C

min. request boundary

1MHz

noise resistant

6,8µF

Ust (Noise signal, 2Û ~ 50Ust)

CAN

Transceiver

Transceiver

250Kbit/sec

250Kbit/sec

1

2

equivalent terminating resistor2 x 120Ω parallel at line ends

1Controller

2Controller

0,1Ust

(automotive industry)

parison)

not noise resistant

UST[V]

f500MHz

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EMC PERFORMANCE OF CF150C (RECEIVER)*

APPENDIX

*) Typical behavior, not tested

TX0

B

A

RX0 RX1

C_L

C_H

ASC

30Ω

30Ω

50Ω

+5V

80dBµV

50Ω

µV TEK 495Analyzer

CAN-Transceiver without EMC reducing measures CF150C with EMC reducing measures

4,7nF

4,7nF

equivalent terminating resistor2 x 120Ω parallel at line ends

TX0

B

A

RX0 RX1

C_L

C_H

ASC

30Ω

30Ω

50Ω

+5V

250kHz

50Ω

µV TEK 495Analyzer

4,7nF

Transceiversending

5V

equivalent terminating resistor2 x 120Ω parallel at line ends

CAN-Transceiver without EMC reducing measures CF150C with EMC reducing measures

Page 9 of 10

EMC PERFORMANCE OF CF150C (TRANSMITTER)*

APPENDIX

*) Typical behavior, not tested

Robert Bosch GmbHAbteilung K8/VKFPostfach 134272703 ReutlingenTel.: (07121) 35-2979Fax: (07121) 35-2170

9/98For further information:

Robert Bosch CorporationAutomotive Group (UO/SAM2)38000 Hills Tech DriveFarmington Hills, MI 48331-3417Tel.: (248) 553-1390Fax: (248) 553-7926

Robert Bosch K.K.Bosch Technical Center9-1, Ushikubo 3-chomeTsuzuki-ku, Yokohama 224Tel.: 045 (912) 8282Fax: 045 (912) 9573

Package: SOIC 8 - Narrow

be

e3

E

L

S

D

M

Ref. Data Book mm Typ Min Max _____________________________A 1.75_____________________________a1 0.10 0.25_____________________________a2 1.65_____________________________b 0.35 0.48_____________________________b1 0.19 0.25_____________________________C 0.50 _____________________________c1 45o_____________________________D see variations _____________________________E 5.8 6.2 _____________________________e 1.27 _____________________________e3 see variations _____________________________F 3.8 4.0 _____________________________L 0.4 1.27_____________________________M 0.6 _____________________________S 8o_____________________________

Variations D/ mm _____________________________

N Typ Min Max _____________________________ 8 4.8 5.0 _____________________________14 8.55 8.75_____________________________16 9.8 10.0 _____________________________

Variations e3/mm _____________________________

N Typ Min Max _____________________________ 8 3.81 _____________________________14 7.62 _____________________________16 8.89 _____________________________