L6364 datasheet(2/60 Pages) STMICROELECTRONICS

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Description

The L6364 is a dual channel transceiver for industrial sensor applications.

It has been designed to support even the IO-Link standard and acts as a bridge between a microcontroller with a

sensor or actuator function and a 24 V supply and signaling cable.

In normal operation the L6364 is configured at start up by the microcontroller via the SPI interface. Typically, the

L6364 then operates as a Single Input Output device driving the output lines as configured by the microcontroller.

If the device is connected to an IO-Link master, then the master can initiate communication and exchange data

with the microcontroller while the L6364 acts as a physical layer for the communication.

The L6364 integrates a surge pulse suppressor circuit featuring the protection of the process side pins (VPLUS,

CQ, DIO, PGND) against up to ±1.5 kV/50 us withstand pulses applied with 500 Ω coupling. Also, the same pins

are protected against reverse polarity (Section 20 Surge pulse and reverse polarity protections).

The two symmetrical input/output stages (CQ and DIO) can be used either for the communication through the

24 V data bus or to drive industrial loads. Each output stage can be configured (Hi-Z, High Side, Low Side,

Push-Pull) and protected against overload by the ISET programmable threshold (110 mA to 250 mA). Also, the

JOIN mode configuration allows to reduce power dissipation and to double overload threshold by shorting CQ and

DIO on the application.

The IC embeds two linear regulators (V3V3 and V5V) than can work either directly supplied by the external supply

rail (VPLUS) or by the high efficiency and configurable (VSET, fSET) embedded DC-DC converter. The output

voltage of the DC-DC can be used as additional supply rail for the application. The total current capability (IOUT) of

the internal regulators and DC-DC is 50 mA.

The logic core of the IC is internally supplied by the V3V3 rail and communicates with the external microcontroller

by an SPI (slave) interface, an interrupt signal (INT) and direct driving of DIO line (CTLD). The VDIG pin defines

the voltage rail of these digital signals: it enables the IC to work even with microcontroller supplied by different

rails than V3V3.

The internal logic embeds an IO-Link UART peripheral that can be configured by the microcontroller in one of

the three possible options: Transparent, Single-octet or Multi-octet (Section 8 IO-Link UART peripheral). In

Transparent mode the IC works purely as a physical layer between the microcontroller and the 24 V data bus:

the workload for the management of the input/output data is fully demanded to the firmware running on the

microcontroller. In Single-octet and Multi-octet modes the IC itself does a set of IO-Link required checks on the

input/output data with consequent drastic reduction of the workload for the microcontroller. The Multi-octet is

usually preferred when the data transfer with the IO-Link master can be managed by the available 8-bits registers

buffer: the IC generates an interrupt to microcontroller when all data in the buffer are ready. If IO-Link data

transfer exceeds the IC buffer capability, then Single-octet can be used instead: in this case the IC generates an

interrupt at every octet ready.

The L6364 offers two programmable pins (LED1 and LED2) acting as LED drivers with configurable current

capability (up to 8 mA, each).

L6364

Description

DS13363 - Rev 4

page 2/60

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