SI9241AEY-T1-E3 Vishay, SI9241AEY-T1-E3 Datasheet

SI9241AEY-T1-E3

Manufacturer Part Number

SI9241AEY-T1-E3

Description

IC SINGLE-ENDED BUS TXRX 8-SOIC

Manufacturer

Vishay

Type

Transceiverr

Datasheets

1.SI9241AEY-T1-E3.pdf (6 pages)

2.SI9241AEY-T1-E3.pdf (3 pages)

Specifications of SI9241AEY-T1-E3

Logic Type

Single-Ended Bus Transceiver

Number Of Drivers/receivers

1/1

Voltage - Supply

4.5 V ~ 5.5 V

Mounting Type

Surface Mount

Package / Case

8-SOIC (3.9mm Width)

Number Of Channels Per Chip

Output Level

CMOS, LSTTL

Output Type

Open Drain

Supply Voltage (max)

36 V

Supply Voltage (min)

6 V

Maximum Operating Temperature

+ 125 C

Minimum Operating Temperature

- 40 C

Mounting Style

SMD/SMT

No. Of Channels

Input Level

3.5V

Logic Case Style

SOIC

No. Of Pins

Supply Voltage Range

4.5V To 5.5V

Operating Temperature Range

-40Â°C To +125Â°C

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Protocol

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Other names

SI9241AEY-T1-E3TR

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A series of compact, single-ended bus drivers for automotive

diagnostic applications enables communication over the

relatively long distances between testing equipment and

automotive electronic control units, while protecting sensitive

logic devices from the hazards of the automotive environment.

The Si9241AEY and Si9243EY are the first narrow-body, small

outline products on the market to meet the ISO 9141 standard for

this application.

ISO 9141 is an international standard for communications

between automobiles and diagnostic testers. It specifies a serial

data communication bus between the vehicle’s Electronic Control

Units (ECUs) and the diagnostic test SAE OBDII Scan Tool (SAE

J 1978). ISO 9141 has been adopted by the California Air

Resources Board for all cars sold in California with feedback fuel

control systems. Similar rules are being adopted in New York,

New Jersey, Massachusetts, and Maryland, and are expected to

affect the design of most cars sold in the United States.

Figure 1 is a system configuration for the ISO 9141 specification.

The primary form of communication is with the single-ended

K-Line. The K-Line passes data bidirectionally, as well as

transferring all address information during initialization.

The optional L-Line is unidirectional and is only used to pass

address information from the diagnostic tester to the ECUs during

initialization. The L-Line is in a 1-state during all other events. The

K-Line will mimic the L-Line’s address initialization.

Document Number: 70573

16-Jan-01

ECU 1

FIGURE 1. Possible System Configuration

Driver ICs for Automotive Diagnostic Communications

Connector According to

ECU 2

SAE J1978

Arrows indicate direction

of data flow.

Meet ISO 9141 Standards

Diagnostic Tester

According to

SAE J1978

Vishay Siliconix ISO 9141 Drivers

Vishay Siliconix has produced two drivers to meet ISO 9141

configurations. Each driver is housed in a small-outline

surface-mount package with on-board fault protection to protect

the controller and tester from the automotive environment.

Both drivers have short circuit and over-temperature protection

and open load detection. The devices protect against voltage

transients ( –3 V

9141 (–1 V to 40 V).

The Drivers

The Si9241AEY (Figure 2) is designed for the user that needs

only K-Line communication. The ECU controls the K output

through Transmit Pin (Tx) and Chip Select Bar (CS). The fault

detection circuitry monitors Tx and K to determine open and

shorted loads. If K is high when Tx is low, the K-Line is shorted.

Conversely, if K is low when Tx is high, the K-Line is open.

Over-temperature protection is always enabled, so a fault is

determined whenever the junction temperature exceeds 150_C.

All faults are latched until chip select bar is set high.

If chip select is not to be used, TX and CS Bar should be tied

together, so all faults will reset when TX toggles high.

The Si9243EY (Figure 3) is designed for users that need both K

and L Lines for communication. It is packaged in an SO-8 for

space savings, but due to pin limitation, it does not have a chip

select function. For the same reason, the Fault Detection signal

is not bonded out. The fault detection and protection circuitry are

active, and the device will shut down in the event of a fault.

FAULT

FIGURE 2. Si9241A K-Line Only Driver

BAT

, K and L] v 45 V), which exceed ISO

Detector

Fault

Vishay Siliconix

GND

–

www.vishay.com

AN602

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SI9241AEY-T1-E3 Summary of contents

Page 1

... V 9141 (– V). The Drivers The Si9241AEY (Figure 2) is designed for the user that needs only K-Line communication. The ECU controls the K output through Transmit Pin (Tx) and Chip Select Bar (CS). The fault detection circuitry monitors Tx and K to determine open and shorted loads ...

Page 2

... Logic “0” Logic “1” V BAT The Vishay Siliconix drivers operate to the above specifications, but with a slightly tighter transmission requirement: Logic “1” minimum w 0.91*V A logic bit transition must be less than 10% of the total bit time. The transition time is measured between the 80% and 20% battery points ...

Page 3

... N/A Conclusion must have b Vishay Siliconix’ ISO 9141 bus driver series is produced to save the automotive designer time and space while improving the overall reliability of the diagnostic system. Each driver exceeds the ISO 9141 transient and data requirements, as well saving significant space overall to a discrete solution. With these factors ...

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