9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

The TMUX7462F is part of the fault protected switches and multiplexers family of devices. The abilty to protect

downstream components from overvoltage events up to ±60 V and latch-up immunity features makes these

switches and multiplexers suitable for harsh environments.

9.2 Typical Application

The need to monitor remote sensors is common among factory automation control systems. For example,

an analog input module or mixed module (AI, AO, DI, and DO) of a programmable logic controller (PLC)

will interface to a field transmitter to monitor various process sensors at remote locations around the factory.

A switch or multiplexer is often used to connect multiple inputs from the system and reduce the number of

downstream channels.

There are a number of fault cases that may occur that can be damaging to many of the integrated circuits. Such

fault conditions may include, but are not limited to, human error due to miswiring, component failure, wire shorts,

electromagnetic interference (EMI), transient distrubances, and more.

PLC Anaog Input / Output Module

V

Fault

Protected

Mux Inputs

S1

S2

S3

S4

D1

D2

D3

D4

TMUX7462F

V

DD

V

SS

+15V -15V

+10V -10V

+24V

Wire

Short

Fault!

High voltage

offset shift

Fault!

Does not require logic control

pins from MCU/processor

Analog Input

Signals

Analog Output

Signals

Field Module

DAC

DAC

+

±

+15V

-15V

-

+

+10V

-10V

-

+

+10V

-10V

ADC

IN1

IN2

Figure 9-1. Typical Application

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TMUX7462F

SCDS394A – MARCH 2021 – REVISED OCTOBER 2021

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