MAX14819 datasheet(21/70 Pages) MAXIM

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Detailed Description

The MAX14819 low-power dual-channel industrial IO-Link

master transceiver is fully compliant with the latest SDCI/

IO-Link standards and test specifications. The MAX14819

features two integrated framers but can alternatively oper-

ate with external UARTs.

The MAX14819 features a high-speed SPI interface

for system-side data and control interfacing. Integrated

IO-Link message frame handlers and FIFOs simplify time

critical control and cycle time management of all IO-Link

M-sequence communication, easing data link layer con-

trol. Autonomous cycle timers also reduce the need for

accurate controller timing. Integrated establish-communi-

cation sequencers simplify wake-up management.

The MAX14819 further includes two sensor supply con-

trollers (L+A, L+B) with current limiting and reverse cur-

rent blocking. The current limit is set with external sense

resistors.

POWER

Power-Up

The CQ_ driver outputs are high impedance when the

VCC supply, V5, and VL voltages are below their respec-

tive undervoltage thresholds during power-up.

The drivers are automatically disabled when the VCC

voltage falls below the 9V (typ) UVLO threshold. The SPI

interface remains active while V5 and VL are present.

VCC Low Voltage and Undervoltage Detection

The MAX14819 monitors the VCC supply for low-voltage

and undervoltage conditions. Low-voltage warnings are

reported in the Status register and can be configured to

generate an interrupt on the IRQ output.

When VCC falls below the 18V (max) low-voltage warn-

ing threshold, the VCCWarn and VCCWarnCOR bits in

the Status register are set. If VCCWarnCOR in the Clock

asserts.

When VCC falls below the 9V (max) undervoltage-lockout

(UVLO) threshold, the VCCUV and VCCUVCOR bits in the

Status register are set. A StatusInt interrupt is generated

and IRQ asserts.

5V Linear Regulator

The MAX14819 includes an integrated regulator to gener-

ate 5V (V5). To enable the internal regulator, leave REGEN

unconnected and connect a 1μF bypass capacitor between

V5 and ground as close as possible to the device. The

internal V5 regulator is capable of driving external loads

up to 20mA.

When the internal 5V linear regulator is not used, V5 is the

supply input for the internal analog and digital functions and

must be supplied externally. Connect REGEN to ground to

disable the internal regulator when applying an external 5V

to V5. Ensure that V5 is present for normal operation.

An internal undervoltage lockout comparator detects

when the V5 voltage falls below the 3.5V (typ) V5_UVLO

threshold. When the V5 voltage drops below this level,

the device is under reset: SPI registers are reset to their

power-up state, the CQ_ outputs and L+_ supplies are

disabled, internal pullups/pulldowns are turned off, the

CQ_ and DI_ receivers are disabled, and the LED outputs

are high impedance. When the V5 voltage rises above the

UVLO threshold, the MAX14819 restarts in the default

power-on configuration.

The internal V5 regulator output is not protected against

short circuits.

Logic Supply (VL)

The VL input is the logic-level supply for all the digital I/

Os. Apply a voltage between 1.62V and 5.5V to VL for

normal operation.

Internal UVLO circuitry monitors the VL supply. If VL falls

below the 0.7V (typ) VL UVLO threshold, all the digital

I/Os referred to VL are ignored and either set to high

impedance or are low.

L+ Sensor Supply Controllers

The MAX14819 includes one sensor/actuator supply

controller for each IO-Link channel, L+A and L+B. Each

sensor supply is configurable through the SPI interface and

must be enabled by setting the L+En_ bit in the L+Cnfg_

provide active current limiting, reverse current blocking,

and undervoltage detection. The 24V VCC field supply

input is tolerant to reverse voltage and the L+A/L+B output

is negative voltage capable down to VCC - 60V.

MAX14819

Dual IO-Link Master Transceiver with Integrated

Framers and L+ Supply Controllers

www.maximintegrated.com

Maxim Integrated │ 21

MAX14819 Datasheet(PDF) 21 Page - Maxim Integrated Products

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