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MAX14821

IO-Link Device Transceiver

19-5916; Rev 3; 3/14

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 applica-

tions, 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 config-

urable 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 inter-

face. 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/sink-

ing up to 100mA.

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

and a 4mm x 4mm, 24-pin TQFN package. Both are speci-

fied over the extended -40NC to +85NC temperature range.

Applications

IO-Link Sensors Industrial Sensors and Actuators

IO-Link Actuators

Features

S IO-Link Specification v.1.0 and v.1.1 Physical Layer-

Compliant

S Supports COM1, COM2, and COM3 Data Rates

S IO-Link Device Wake-Up Detection

S Push-Pull, High-Side, or Low-Side Outputs

S 100mA Specified C/Q Output Drive

S Auxiliary 24V, 100mA Digital Output

S Auxiliary 24V Digital Input

S Optional 6mA/7mA Current Loads at Both 24V Inputs

S 5V and 3.3V Linear Regulators

S Reverse-Polarity Protected 24V Supply Output

S EMI Emission Control Through Slew-Controlled Driver

S SPI Interface for Configuration and Monitoring

S 2.5V to 5V Logic Interface Levels

S Reverse-Polarity and Short-Circuit Protection on All

24V Inputs/Outputs

S High-Temperature Warning and Thermal Shutdown

S Extensive Fault Monitoring and Reporting

S -40NC to +85NC Operating Temperature Range

S 2.5mm x 2.5mm WLP and 4mm x 4mm TQFN

Packages

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

SPI is a trademark of Motorola, Inc.

Ordering Information appears at end of data sheet.

Typical Operating Circuit

For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/MAX14821.related

10kΩ

MAX14821

0.8Ω

1μF

10Ω

1μF 0.1μF

UVGPIO2

LDOIN

SPI

C/Q

L+

L-

GND

LDO33V

TXQ

MICROCONTROLLER

WUIRQ

RXRX

TXCTX

TXENRTS

LOGPIO1

3.3V

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

Summary of content (31 pages)

PAGE 1
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.
PAGE 2
MAX14821 IO-Link Device Transceiver Functional Diagram LDO33 V5 LDOIN VP UV UV MONITOR 3.
PAGE 3
MAX14821 IO-Link Device Transceiver ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) VCC..........................................................................-40V to +40V VP (IVP < 50mA)...... the higher of -0.3V and (VCC - 1V) to +40V LDOIN.....................................................................-0.3V to +40V V5...................... -0.3V to the lesser of (VLDOIN + 0.3V) and +6V LDO33...................... -0.3V to the lesser of (V5 + 0.3V) and +6V VL.....
PAGE 4
MAX14821 IO-Link Device Transceiver DC ELECTRICAL CHARACTERISTICS (continued) (VCC = 18V to 36V, VL = 2.3V to 5.5V, VGND = 0V; all logic inputs at VL or GND; TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 24V, VL = 3.3V, and TA = +25NC, unless otherwise noted.) (Note 2) PARAMETER V5 Output Voltage Range SYMBOL V5 V5 Load Regulation CONDITIONS No load on V5, 7V P VLDOIN P 36V 1mA < ILOAD < 10mA, VLDOIN = 7V, 0.1FF bypass capacitor on V5 MIN TYP MAX UNITS 4.75 5.00 5.
PAGE 5
MAX14821 IO-Link Device Transceiver DC ELECTRICAL CHARACTERISTICS (continued) (VCC = 18V to 36V, VL = 2.3V to 5.5V, VGND = 0V; all logic inputs at VL or GND; TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 24V, VL = 3.3V, and TA = +25NC, unless otherwise noted.
PAGE 6
MAX14821 IO-Link Device Transceiver AC ELECTRICAL CHARACTERISTICS (VCC = 18V to 36V, VL = 2.3V to 5.5V, VGND = 0V; all logic inputs at VL or GND; TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 24V, VL = 3.3V, and TA = +25NC, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS C/Q, DO, DI INTERFACES Data Rate DR HiSlew = 1 4.8 230.4 HiSlew = 0 4.8 38.
PAGE 7
MAX14821 IO-Link Device Transceiver AC ELECTRICAL CHARACTERISTICS (continued) (VCC = 18V to 36V, VL = 2.3V to 5.5V, VGND = 0V; all logic inputs at VL or GND; TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 24V, VL = 3.3V, and TA = +25NC, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SPI TIMING (CS, SCLK, SDI, SDO) (Figure 6) SCLK Clock Period tCH+CL 83.3 ns tCH 41.65 ns SCLK Pulse-Width Low tCL 41.
PAGE 8
MAX14821 IO-Link Device Transceiver TXEN TXC C/Q OR DO MAX14821 TXQ 3.3nF 5kΩ LO GND VL TXEN 0V VL (TXC AND TXQ) OR LO 50% tPDHL 0V tPDLH C/Q OR DO tFALL VCC 90% 50% 10% 0V tRISE Figure 1. C/Q and LO Driver Propagation Delays and Rise/Fall Times VCC 5kΩ TXEN C/Q VL 3.3nF MAX14821 TXC TXQ GND VL TXEN tENL 0V tDISH VCC C/Q 10% 10% 0V Figure 2.
PAGE 9
MAX14821 IO-Link Device Transceiver TXEN C/Q MAX14821 TXC 3.3nF 5kΩ TXQ GND VL TXEN 0V tDISL tENH C/Q VCC 90% 90% 0V Figure 3. C/Q Driver Enable High and Disable Low Timing RX OR LI C/Q OR DI 15pF MAX14821 GND TXEN VCC C/Q OR DI 50% tPRLH 0V tPRHL VL RX OR LI 50% 0V Figure 4.
PAGE 10
MAX14821 IO-Link Device Transceiver TXEN WU TXC AND TXQ MAX14821 C/Q GND TXEN TXC AND TXQ < tWUMIN NO WAKE-UP C/Q tWUMIN < tWU < tWUMAX WU tWUL NOTE: THE MAX14821 RECOGNIZES A WAKE-UP PULSE WHEN C/Q IS SHORTED FROM HIGH-TO-LOW OR FROM LOW-TO-HIGH FOR tWUMIN < tWU < tWUMAX. Figure 5. Wake-Up Detection Timing CS tCSS tCSH tCH tCSH tCL SCLK tDS tDH SDI tDO SDO Figure 6.
PAGE 11
MAX14821 IO-Link Device Transceiver Typical Operating Characteristics (VCC = 24V, LDOIN = VP, VL = LDO33, C/Q and DO in push-pull configuration, TA = +25NC, unless otherwise noted.) C/Q DRIVER OUTPUT HIGH vs. LOAD CURRENT C/Q DRIVER OUTPUT LOW vs. SINK CURRENT 23 6 5 22 VOL_C/Q (V) TA = -40°C 0 25 50 75 100 125 150 25 50 75 100 125 LOAD CURRENT (mA) SINK CURRENT (mA) DO DRIVER OUTPUT HIGH vs. LOAD CURRENT DO DRIVER OUTPUT LOW vs.
PAGE 12
MAX14821 IO-Link Device Transceiver Typical Operating Characteristics (continued) (VCC = 24V, LDOIN = VP, VL = LDO33, C/Q and DO in push-pull configuration, TA = +25NC, unless otherwise noted.) C/Q DRIVER OUTPUT SWITCHING (HiSlew = 0) C/Q DRIVER OUTPUT SWITCHING (HiSlew = 1) MAX14821 toc07 MAX14821 toc08 VTXC=TXQ 2V/div Ch1 Ch2 1.430µs 0V Ch1 Ch2 1.330µs VC/Q 5V/div Ch2 RISE 1.583µs VTXC=TXQ 2V/div Ch1 Ch2 357.1ns 0V Ch1 Ch2 335.4ns VC/Q 5V/div Ch2 RISE 343.5ns Ch2 FALL 1.
PAGE 13
MAX14821 IO-Link Device Transceiver Typical Operating Characteristics (continued) (VCC = 24V, LDOIN = VP, VL = LDO33, C/Q and DO in push-pull configuration, TA = +25NC, unless otherwise noted.) LDOIN SUPPLY CURRENT vs. LDOIN VOLTAGE C/Q SHORT-CIRCUIT PROTECTION MAX14821 toc13 3.5 C/Q 10V/div 3.0 ILDOIN (mA) ISINK 100mA/div MAX14821 toc14 4.0 2.5 2.0 1.5 VCC = 36V C/Q AND DO DRIVERS ENABLED V5, LDO33 ARE LOADED TXC = TXQ = LO = VL 1.
PAGE 14
MAX14821 IO-Link Device Transceiver Pin/Bump Configurations TOP VIEW (BUMP SIDE DOWN) UV LI LO WU RX TXEN TOP VIEW 18 17 16 15 14 13 12 TXC GND 20 11 TXQ 10 I.C. MAX14821 DO 22 VCC 23 *EP + 1 2 3 4 5 6 LDOIN V5 LDO33 IRQ SCLK CS VP 24 1 2 3 4 5 A VCC LDOIN V5 LDO33 SCLK B C/Q VP IRQ CS SDO C GND GND I.C. SDI VL D DO UV WU TXC TXQ E DI LI LO RX TXEN + DI 19 C/Q 21 MAX14821 9 VL 8 SDI 7 SDO WLP TQFN *CONNECT EXPOSED PAD TO GND.
PAGE 15
MAX14821 IO-Link Device Transceiver Pin/Bump Descriptions (continued) PIN NAME FUNCTION TQFN-EP WLP 11 D5 TXQ Transmit Level Input. The logic on the C/Q output is the inverse logic level of the signals on the TXC and TXQ inputs. TXQ is ANDed with TXC. Drive TXQ high if not in use. 12 D4 TXC Transmit Communication Input. The logic on the C/Q output is the inverse logic level of the signals on the TXC and TXQ inputs. TXC is ANDed with TXQ. Drive TXC high if not in use.
PAGE 16
MAX14821 IO-Link Device Transceiver Detailed Description The MAX14821 is a sensor/actuator transceiver designed for IO-Link device applications supporting all the specified IO-Link data rates. In IO-Link applications, the device acts as the physical layer interface to a microcontroller running the data-link layer protocol. The device contains an additional 24V digital input and an additional 24V digital output. Two internal linear regulators generate common sensor and actuator power requirements: 5V and 3.
PAGE 17
MAX14821 IO-Link Device Transceiver DO Fault Detection The device registers a DoFault event when a short circuit is present at the DO output for 440Fs. A short condition exists when the load current on the DO driver exceeds the 135mA (typ) DO current limit. When a short-circuit condition is detected, the DO driver enters autoretry mode. In autoretry mode the device periodically checks whether the error is still present. Autoretry attempts last for 440µs (typ) and occur every 26ms (typ).
PAGE 18
MAX14821 IO-Link Device Transceiver The SPI register contents are unchanged while V5 is present, regardless of the state of VCC and LDO33. The SPI interface is not accessible and IRQ is not available when UV is asserted due to a V5 or VL undervoltage event. When the internal 3.3V LDO regulator voltage (VLDO33) falls below the LDO33 undervoltage-lockout threshold, the UV33Int bit in the Status register is set and IRQ asserts. UV asserts if the UV33En bit in the Mode register is set to 1.
PAGE 19
MAX14821 IO-Link Device Transceiver Register Functionality The device has four 8-bit-wide registers for configuration and monitoring (Table 1). Table 1.
PAGE 20
MAX14821 IO-Link Device Transceiver BIT NAME DESCRIPTION D4 QLvl C/Q Logic Level. The QLvl bit is the inverse of the logic level at C/Q. QLvl is 1 when the C/Q input level is low (< 8V) and is 0 when the C/Q logic level is high (> 13V) (Table 3). QLvl remains active when the C/Q receiver is disabled (RxDis = 1). QLvl does not affect IRQ. QLvl is not changed when the Status register is read. D3 C/QFaultInt C/Q Fault Interrupt.
PAGE 21
MAX14821 IO-Link Device Transceiver CQConfig Register [R1, R0] = [0,1] Bit D7 D6 D5 D4 D3 D2 D1 D0 RxFilter HiSlew C/Q_N/P C/Q_PP C/QDEn Q RxDis C/QLoad Read/Write R/W R/W R/W R/W R/W R/W R/W R/W POR State 0 0 0 0 0 0 0 0 Bit Name Use the CQConfig register to control the C/Q receiver and driver parameters. All bits in the CQConfig register are read-write and are set to 0 at power-up. BIT NAME D7 RxFilter DESCRIPTION C/Q and DI Receiver Filter Control.
PAGE 22
MAX14821 IO-Link Device Transceiver Table 4. C/QDEn and TXEN C/Q Driver Control C/QDEn TXEN C/Q DRIVER 0 Low Disabled X High Enabled 1 X Enabled X = Don’t care. TXQ TXC C/Q Q Figure 9. Equivalent C/Q Logic Table 5.
PAGE 23
MAX14821 IO-Link Device Transceiver DIOConfig Register [R1, R0] = [1,0] Bit D7 D6 D5 D4 D3 D2 D1 D0 DoInv DoAv DoN/P DoPP DoEn DoBit LiDis DiLoad Read/Write R/W R/W R/W R/W R/W R/W R/W R/W POR State 0 0 0 0 0 0 0 0 Bit Name Use the DIOConfig register to control the DI and DO interfaces. All bits in the DIOConfig register are read-write and are set to 0 at power-up. BIT NAME DESCRIPTION D7 DoInv DO Output Polarity.
PAGE 24
MAX14821 IO-Link Device Transceiver Table 6.
PAGE 25
MAX14821 IO-Link Device Transceiver Mode Register [R1, R0] = [1,1] Bit D7 D6 D5 D4 D3 D2 D1 D0 Bit Name RST WuIntEn DoFault C/QFault UV24 OTemp UV33En LDO33Dis Read/Write R/W R/W R R R R R R/W POR State 0 0 0 0 0 0 0 0 Use the Mode register to reset the MAX14821 and manage the 3.3V LDO. The Mode register has bits that represent the current status of fault conditions. When writing to the Mode register, the contents of the fault indication bits (bits 2 to 5) do not change.
PAGE 26
MAX14821 IO-Link Device Transceiver SPI Interface for the device is 12MHz. The SPI interface complies with clock polarity CPOL = 0 and clock phase CPHA = 0 (see Figure 11 and Figure 12). The device communicates through an SPI-compatible 4-wire serial interface. The interface has three inputs— clock (SCLK), chip select (CS), and data in (SDI)—and one output, data out (SDO). The maximum SPI clock rate The SPI interface is not available when V5 or VL are not present.
PAGE 27
MAX14821 IO-Link Device Transceiver Applications Information The device can be interfaced to microcontrollers where the on-board UART TX output cannot be programmed as a logic output (GPO). In this case, connect the TX output of the UART to the TXC input for IO-Link communication and connect a separate GPO output on the microcontroller to TXQ for standard IO (SIO) mode operation (Figure 13).
PAGE 28
MAX14821 IO-Link Device Transceiver EN IN MAX17501F 5V STEP-DOWN REGULATOR LX GND FB 5V 3.3V 1μF 0.1μF 10kΩ VCC GPIO2 UV VL TXQ LDO33 V5 LDOIN VP 0.8Ω VCC 1μF SPI MICROCONTROLLER GND IRQ WU RX RX TX TXC RTS TXEN GPIO1 DO MAX14821 L+ 1 2 C/Q LO DI 4 3 L- GND Figure 15.
PAGE 29
MAX14821 IO-Link Device Transceiver Revision History REVISION NUMBER REVISION DATE 0 8/11 Initial release 1 12/11 Corrected data line direction for Typical Operating Circuit, removed TOC 14 and added new TOC 17, corrected DO Fault Detection section, corrected Thermal Shutdown section, corrected IEC number in Transient Protection section, corrected Figures 11 and 14 2 7/12 Updated formula in Thermal Protection and Considerations section, updated Optional External Powering section, updated Figure 14
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MAX14821 IO-Link Device Transceiver Maxim Integrated 31