SI9243 datasheet(4/7 Pages) VISHAY

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Document Number: 70788

S11-0975-Rev. F, 16-May-11

Vishay Siliconix

Si9243A

This document is subject to change without notice.

THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

PIN CONFIGURATION

FUNCTIONAL DESCRIPTION

The Si9243AEY can be either in transmit or receive mode

and it contains over temperature, and short circuit VBAT fault

detection circuits.

The voltage on the K and L pins are internally compared to

VBAT/2. If the voltage on the K or L pin is less than VBAT/2 then

RXK or RXL output will be "low". If the voltage on the K or L

pin is greater than VBAT/2 then RXK or RXL output will be

"high".

In order to be in transmit mode, TX must be set "low". The TX

signal is then internally inverted and turns the MOSFET on,

causing the K pin to be "low". In transmit mode, the

processor monitors the RXK and TX. When the two mirror

each other there is no fault. In the event of over temperature,

or short circuit to VBAT, the Si9243AEY will turn off the K

output to protect the IC. The K pin will stay in high impedance

and RXK will follow the K pin. The fault will be reset when TX

is toggled high. RXK, RXL and TX pins have internal pull up

resistor to VDD while K and L pins have internal pull down

resistors. When any one of the TX, VBAT or GND pins is open

the K output is off.

When the TX pin is set "high" the Si9243AEY is in receive

mode and the internal MOSFET is turned off. RXL and RXK

outputs will follow L and K inputs respectively.

Top View

Narrow Body

RXL

RXK

VBAT

GND

SO Package

VDD

ORDERING INFORMATION

Part Number

Temperature Range

Si9243AEY-T1

- 40 to 125 °C

Si9243AEY-T1-E3 (Lead (Pb)-free)

PIN DESCRIPTION

Pin Number

Symbol

Description

RXK

K Receiver, Output

RXL

L Receiver, Output

VDD

Positive Power Supply

Transmit, Input

GND

Ground Connection

K Transmit/Receive, Bidirectional

VBAT

Battery Power Supply

L Transmit, Input

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