Features

Single-Ended Transceiver

Survives Shorts and Transients on Automotive Bus

Wide Power Supply Voltage Range

ISO 9141 Compatible

Open Drain Fault Output

Benefits

Single-Wire Multiplexer Interface

ISO Diagnosis Bus

Applications

Automobiles

Trucks

Tractors

Description

The Si9241EY is a monolithic bus transceiver designed to

provide bidirectional serial communication in automotive

diagnostic applications.

The device incorporates protection against overvoltages

and short circuits to GND or VB. The transceiver pin is

protected and can be driven beyond the VB voltage.

A fault output provides an active low in case of a short

circuit or an open load. In the event of an over temperature

condition, the output is immediately switched off and a fault

indicated. This condition can only be reset once the over

temperature condition is removed, and CS is toggled high.

For bi-directional communication, CS must be High for

“receive” and Low for “transmit”. If CS is Low, while IC

is receiving data, an incorrect fault signal will occur. To

inhibit the open load and short detect, tie CS and TX

together.

The Si9241EY is built on the Siliconix BiC/DMOS

process. An epitaxial layer prevents latchup.

The RX output is capable of driving CMOS or

1
LSTTL load.

The Si9241EY is available in a space efficient 8-pin SO

package. It operates reliably over the automotive

temperature range (–40 to 125C).