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MAX13020/MAX13021

±60V Fault-Protected LIN Transceivers

General Description

The MAX13020/MAX13021 ±60V fault-protected low-

power local interconnect network (LIN) transceivers are

ideal for use in automotive network applications where

high reliability is required. The devices provide the

interface between the LIN master/slave protocol con-

troller, and the physical bus described in the LIN 2.0

specification package and SAE J2602 specification.

The devices are intended for in-vehicle subnetworks

with a single master and multiple slaves.

The extended fault-protected voltage range of ±60V on

the LIN bus line allows for use in +12V, +24V, and

+42V automotive applications. The devices allow com-

munication up to 20kbaud, and include slew-rate limit-

ed transmitters for enhanced electromagnetic

emissions (EME) performance. The devices feature a

low-power 4µA sleep mode and provide wake-up

source detection.

The MAX13020 is a pin-to-pin replacement and is func-

tionally compatible with the Philips TJA1020. The

MAX13021 includes enhanced bus dominant clamping

fault management for reduced quiescent current during

LIN bus shorts to GND. The MAX13020/MAX13021 are

available in the 8-pin SO package, and operate over

the -40°C to +125°C automotive temperature range.

Applications

+12V/+42V Automotive

+24V Heavy Truck and Bus

Features

o MAX13020 is a Pin-to-Pin Upgrade for TJA1020

o ESD Protection

±12kV Human Body Model (LIN)

±4kV Contact Discharge (LIN, NWAKE, BAT)

o LIN 2.0/SAE J2602 Compatible

o Slew-Rate Limited Transmitter for Low

Electromagnetic Emissions (EME)

o Robust Electromagnetic Immunity (EMI)

o Passive Behavior in Unpowered State

o TXD Dominant Timeout Function

o LIN Bus Dominant Management (MAX13021 Only)

o Input Levels Compatible with +3.3V and +5V

Controllers

o Integrated 30kΩ Termination Resistor for Slave

Applications

o Low 4µA Sleep Mode with Local and Remote

Wake-Up Detection

o Wake-Up Source Recognition

o Thermal Shutdown

19-0559; Rev 2; 10/12

Ordering Information

PART

L IN B U S D O M IN A N T

M A N A G EM EN T

PIN-PACKAGE

MAX13020ASA+ — 8 SO

MAX13021ASA+ Yes 8 SO

MAX13021ASA/V+ Yes 8 SO

BAT

TXD

RXD

NSLP

LIN

GND

INH

NWAKE

MICROCONTROLLER

LIN

BUS

1kΩ

BAT

MASTER NODE

ONLY

+5V LDO

MAX5023

MAX13020

MAX13021

*OPTIONAL TXD PULLUP RESISTOR FOR READING WAKE-UP SOURCE FLAG

Typical Operating Circuit

Note: All devices are specified over the -40°C to +125°C auto-

motive temperature range.

Denotes a lead(Pb)-free/RoHS-compliant package.

Pin Configuration appears at end of data sheet.

Summary of content (16 pages)

PAGE 1
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers General Description Features o MAX13020 is a Pin-to-Pin Upgrade for TJA1020 o ESD Protection ±12kV Human Body Model (LIN) ±4kV Contact Discharge (LIN, NWAKE, BAT) o LIN 2.
PAGE 2
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted. Positive currents flow into the device.) BAT.........................................................................-0.3V to +40V TXD, RXD, NSLP.......................................................-0.3V to +7V LIN ...........................................................0V to ±60V Continuous LIN to BAT..........................................................
PAGE 3
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers ELECTRICAL CHARACTERISTICS (continued) (VBAT = +5V to +38V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VBAT = +12V and TA = +25°C. Positive currents flow into the device.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS TRANSMITTER DATA INPUT (TXD) High-Level Input Voltage VIH Output recessive Low-Level Input Voltage VIL Output dominant Pulldown Resistance RTXD 2 V 0.
PAGE 4
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers ELECTRICAL CHARACTERISTICS (continued) (VBAT = +5V to +38V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VBAT = +12V and TA = +25°C. Positive currents flow into the device.
PAGE 5
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers TIMING CHARACTERISTICS (VBAT = +5V to +38V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VBAT = +12V and TA = +25°C. Positive currents flow into the device.
PAGE 6
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers TIMING CHARACTERISTICS (continued) (VBAT = +5V to +38V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VBAT = +12V and TA = +25°C. Positive currents flow into the device.
PAGE 7
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers Typical Operating Characteristics (continued) (VBAT = +12V and TA = +25°C, unless otherwise noted.
PAGE 8
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers Typical Operating Characteristics (continued) (VBAT = +12V and TA = +25°C, unless otherwise noted.) LIN TRANSMITTING NORMAL SLOPE MODE LIN TRANSMITTING NORMAL SLOPE MODE LIN TRANSMITTING LOW SLOPE MODE MAX13020 toc11 MAX13020 toc10 MAX13020 toc12 TX 5V/div TX 5V/div TX 5V/div LIN 5V/div LIN 5V/div LIN 5V/div RX 5V/div RX 5V/div RX 5V/div 10µs/div RL = 500kΩ CL = 10nF NORMAL SCOPE MODE 20kbps 10µs/div RL = 660kΩ CL = 6.
PAGE 9
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers Pin Description PIN NAME FUNCTION 1 RXD 2 NSLP Sleep Input. Drive NSLP logic-high or logic-low to control the operating mode. (See Table 1 and Figures 1, 2) 3 NWAKE Local Wake-Up Input. Present a falling edge on NWAKE to generate a local wake-up event. Connect NWAKE to BAT with a 5kΩ resistor if local wake-up is not required. 4 TXD Data Transmit Input, CMOS Compatible.
PAGE 10
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers t(NWAKE = 0 AFTER 1 TO 0) > tNWAKE t(NSLP = 0 AFTER 1 TO 0) > tGOTOSLEEP t(LIN = DOMINANT) > tLIN(DOM)(DET) FAULT MODE t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM t(LIN = RECESSIVE) > tLIN(DOM)(REC) NORMAL SLOPE MODE t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM t (NSLP = 1 AFTER 0 TO 1) TXD = 1 >t GOTONORM DISABLE MODE t(LIN = DOMINANT) > tLIN(DOM)(DET) STANDBY MODE t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM TXD = 0 TXD = 1 t(NSLP = 0 AFTER 1 TO 0) > tGOTOSLEEP
PAGE 11
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers Low Slope Mode Low slope mode is identical to normal slope mode, with the exception of the LIN transmitter. In low slope mode, the transmitter slew-rate is further limited for improved EME performance. Maximum data rate is limited to 10.4kbaud due to the increased slew-rate limiting of the LIN transmitter. From standby or sleep mode, drive TXD logic-low, then drive NSLP logic-high for longer than tGOTONORM to enter low slope mode.
PAGE 12
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers 10µA pullup. In applications where local wake-up capability is not required, connect NWAKE to BAT. For improved EMI performance, connect NWAKE to BAT through a 5kΩ resistance. A remote wake-up event is generated when a recessive-dominant-recessive sequence is detected on LIN. The dominant state must be asserted longer than tBUS to generate a remote wake-up (Figure 3).
PAGE 13
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers tBIT tBIT tBIT VTXDL tBUS(REC)(MIN) tBUS(DOM)(MAX) VSUP(1) VTH(REC)(MAX) VTH(DOM)(MAX) LIN BUS SIGNAL VTH(REC)(MIN) VTH(DOM)(MIN) tBUS(DOM)(MIN) RECEIVING NODE 1 THRESHOLDS OF RECEIVING NODE 1 tBUS(REC)(MAX) VRXDL1 tP(rx1)F tP(rx1)F RECEIVING NODE 2 THRESHOLDS OF RECEIVING NODE 1 VRXDL2 (1) TRANSCEIVER SUPPLY OF TRANSMITTING NODE. tP(rx2)F tP(rx2)F Figure 4.
PAGE 14
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers Functional Diagram MAX13020 MAX13021 BAT THERMAL SHUTDOWN WAKE-UP TIMER NWAKE INH MODE CONTROL NSLP TXD 5µA SLEEP/NORMAL TIMER LIN SLEW RATE CONTROL TXD TIME-OUT TIMER 30kΩ BUS TIMER RXD FILTER RXD/INT VBAT/2 GND 14 Maxim Integrated
PAGE 15
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers Pin Configuration Chip Information PROCESS: BiCMOS TOP VIEW + RXD NSLP NWAKE 1 8 2 3 MAX13020 MAX13021 TXD 4 SO Maxim Integrated Package Information INH 7 BAT 6 LIN 5 GND For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only.
PAGE 16
MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers Revision History REVISION NUMBER REVISION DATE 2 10/12 DESCRIPTION Added automotive qualified part to Ordering Information PAGES CHANGED 1 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.