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MAX14821

IO-Link Device Transceiver

Maxim Integrated 

MAX14821

IO-Link Device Transceiver

General Description

The MAX14821 transceiver is suitable for IO-Link®

devices and 24V binary sensors/actuators. All specified

IO-Link data rates are supported. In IO-Link applications,

the transceiver acts as the physical layer interface to

a microcontroller running the data-link layer protocol.

Additional 24V digital inputs and outputs are provided.

Two internal linear regulators generate common sensor

and actuator power requirements: 5V and 3.3V.

On-board C/Q and DO drivers are independently configurable

for push-pull, high-side (PNP), or low-side (NPN) operation.

The device detects the IO-Link C/Q wake-up condition

and generates a wake-up signal on the active-low WU

output. The C/Q and DI inputs have selectable current

loads for use in actuators.

An SPI™ interface allows configuration and monitoring

of the device. Extensive alarm conditions are detected

and communicated through the IRQ output and the SPI

interface. The device features reverse-polarity, short-circuit,

and thermal protection. All power lines are monitored for

undervoltage conditions.

The C/Q and DO drivers are specified for sourcing/sinking

up to 100mA.

The device is available in a 2.5mm x 2.5mm, 25-pin wafer-

level package (WLP) and a 4mm x 4mm, 24-pin TQFN

package. Both are specified over the extended -40NC to

+85NC temperature range.

Benefits and Features

●● Standards Compliance Ensures Future-Proof Solutions

• IO-Link Versions 1.0 and 1.1.2

• IEC IEC61131.9 SDCI

●● High Configurability and Integration Reduces SKUs

• Push-Pull, PNP, or NPN Driver Configuration

• Supports COM1, COM2, and COM3 Data Rates

• SPI Interface for Control and Monitoring

• 2.5V to 5V Logic Interface Levels

• Auxiliary 24V, 100mA Digital Output (DO)

• Auxiliary 24V Digital Input (DI)

• 100mA Specified C/Q output Drive

• Integrated 5V and 3.3V Regulators

●● Integrated Protection Enables Robust Solutions

• Extensive Fault-Monitoring and Reporting

• Reverse-Polarity and Short-Circuit Protection on

All 24V Outputs/Inputs

• Reverse-Polarity Protected 24V Supply Output

-40°C to +105°C Operating Temperature Range

●● Small Package Supports Sensor Miniaturization

• 2.5mm x 2.5mm WLP and 4mm x 4mm TQFN

Package

Applications

IO-Link Sensors Industrial Sensors and Actuators

IO-Link Actuators

Typical Operating Circuit

Ordering Information appears at end of data sheet.

5V

3.3V

10kΩ

VCC

GPIO2

0.1µF

0.1µF

1µF

10Ω

VL TXQ LDO33

V5

LDOIN

UV

VP

VCC

SPI

MICROCONTROLLER

IRQ

RX

TX

RTS

GND

GPIO1

WU

RX

TXC

TXEN

LO

MAX14821

DO

DI

C/Q

GND

1µF

0.8Ω

L+

1

2

4

3

L-

IO-Link is a registered trademark of Profibus User Organization (PNO).

SPI is a trademark of Motorola, Inc.

19-5916; Rev 6; 12/15

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