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 2.0/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
The MAX13020/MAX13021 ±60V fault-protected lowpower 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 controller, 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 communication up to 20kbaud, and include slew-rate limited 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 functionally 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.
Ordering Information
LIN BUS DOMINANT
PIN-PACKAGE
MANAGEMENT
PART
Applications
MAX13020ASA+
—
8 SO
+12V/+42V Automotive
MAX13021ASA+
Yes
8 SO
+24V Heavy Truck and Bus
MAX13021ASA/V+
Yes
8 SO
Note: All devices are specified over the -40°C to +125°C automotive temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit
VBAT
LIN
BUS
MAX5023
+5V LDO
EN
INH
BAT
*
NWAKE
MASTER NODE
ONLY
MAX13020
MAX13021
1kΩ
TXD
MICROCONTROLLER
RXD
NSLP
GND
LIN
*OPTIONAL TXD PULLUP RESISTOR FOR READING WAKE-UP SOURCE FLAG
Pin Configuration appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-0559; Rev 2; 10/12
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..........................................................-80V Continuous
NWAKE...................................................................-0.3V to +80V
NWAKE Current (NWAKE < -0.3V) ....................................-15mA
INH ..............................................................-0.3V to VBAT + 0.3V
INH Current .......................................................-50mA to +15mA
Continuous Power Dissipation
8-Pin SO (derate 5.9mW/°C above +70°C)...................471mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) ................................+300°C
Soldering Temperature (reflow) ......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL 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.)
PARAMETER
BAT Supply Voltage
SYMBOL
VBAT
CONDITIONS
Operating range
Sleep mode,
VNWAKE = VBAT,
VTXD = VNSLP = VGND
BAT Supply Current
IBAT
TYP
5.0
VBAT = +27V,
VLIN = VBAT
1
4
VBAT = +38V,
VLIN = VBAT
MAX
UNITS
38.0
V
8
8
Standby mode, bus recessive,
VBAT = +5V to +27V,
VLIN = VINH = VNWAKE = VBAT,
VTXD = VNSLP = VGND
100
Standby mode, bus dominant,
VBAT = +12V, VINH = VNWAKE = VBAT,
VLIN = VTXD = VNSLP = VGND
300
1000
2000
Normal/low slope mode,
bus recessive, VBAT = +5V to +27V,
VLIN = VINH = VNWAKE = VBAT,
VTXD = VNSLP = +5V
100
650
1000
1
4.5
8
Normal/low slope mode,
bus dominant, no load,
VBAT = VINH = VNWAKE = +12V,
VTXD = VGND, VNSLP = +5V
2
MIN
650
1000
µA
Sleep mode, bus dominant,
VBAT = VNWAKE = +12V,
VLIN = VTXD = VNSLP = VGND
90
Fault mode, bus dominant (MAX13021),
VINH = VNWAKE = VBAT,
VLIN = VGND, VNSLP = +5V
30
60
Disable mode, bus dominant (MAX13021),
VBAT = VINH = VNWAKE = +12V, VLIN = VGND
20
30
mA
µA
Maxim Integrated
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
0.8
V
125
330
800
kΩ
Low-Level Input Current
IIL
VTXD = VGND
-5
0
+5
µA
Low-Level Output Current
IOL
Standby mode, VNWAKE = VGND,
VLIN = VBAT, VTXD = +0.4V,
local wake-up request
1.5
6
mA
IOL
VLIN = VGND, VRXD = +0.4V
1.2
4.1
mA
ILH
Normal/low slope mode,
VLIN = VBAT, VRXD = +5V
-5
0
RECEIVER DATA OUTPUT (RXD)
Low-Level Output Current
High-Level Leakage Current
+5
µA
NSLP INPUT
High-Level Input Voltage
VIH
Low-Level Input Voltage
VIL
Pulldown Resistance
Low-Level Input Current
RNSLP
IIL
2
VNSLP = +5V
VNSLP = VGND
V
0.8
V
125
330
800
kΩ
-5
0
+5
µA
NWAKE INPUT
High-Level Input Voltage
VIH
Low-Level Input Voltage
VIL
VBAT - 1.0
V
VBAT - 3.3
V
NWAKE Pullup Current
IIL
VNWAKE = VGND
-30
-10
-3
µA
High-Level Leakage Current
ILH
VNWAKE = +38V, VBAT = +38V
-5
0
+5
µA
Switch On-Resistance Between
BAT and INH
RSW
Standby, normal/low slope modes, IINH =
-15mA, VBAT = +12V
22
50
Ω
High-Level Leakage Current
ILH
Sleep mode,
VNWAKE = +38V, VBAT = +38V
0
+5
µA
INH OUTPUT
-5
LIN BUS I/O
LIN Recessive Output Voltage
VO(RECES)
LIN Dominant Output Voltage
VO(DOM)
Maxim Integrated
VTXD = +5V, ILIN = -1µA
Normal/low slope mode,
VTXD = VGND, VBAT = +7V to +27V,
RTERM = 500Ω to BAT
VBAT -1.0V
V
0.2 x VBAT
V
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
High-Level Leakage Current
SYMBOL
ILH
CONDITIONS
MIN
TYP
MAX
UNITS
VLIN = VBAT, VTXD = +5V
-5
0
+5
µA
0
+5
µA
Device Leakage Current, VBAT
Disconnected
IL(BAT)
VBAT = VGND, VLIN = +18V
-5
Device Leakage Current, GND
Disconnected
IL(GND)
VBAT = VGND, VLIN = -18V
-100
0
µA
Fault mode, disable mode (MAX13021)
VLIN = VGND
-10
-2
µA
VBAT 2.5
VBAT 0.9
V
Sleep mode, VLIN = VGND, VNSLP = VGND
-10
-2
µA
Standby, normal/low slope modes, VLIN =
VGND, VBAT = +12V
20
30
47
kΩ
VLIN = VBAT = +12V,
VTXD = VGND, t < tDOM
27
40
60
VLIN = +12V, VBAT = +27V,
VTXD = VGND, t < tDOM (Note 1)
45
70
100
LIN Current After Short Detection
Short-Circuit Recovery Threshold
Voltage
LIN Pullup Current
Slave Termination Resistance to
VBAT
Short-Circuit Output Current
IIL(FAULT)
Vth(RECOVERY) Fault mode, disable mode (MAX13021)
IIL
RSLAVE
IO(SC)
VBAT = +12V, VLIN = +60V, VTXD = VGND,
t < tDOM
mA
45
Receiver Dominant State
Vth(DOM)
VBAT = +7V to +38V
Receiver Recessive State
Vth(REC)
VBAT = +7V to +38V
0.6 x VBAT
Vth(CENTER)
VBAT = +7V to +38V
0.475 x
VBAT
0.5 x
VBAT
0.525 x
VBAT
V
Receiver-Threshold Hysteresis
Voltage
Vth(HYS)
VBAT = +7V to +38V
0.145 x
VBAT
0.16 x
VBAT
0.175 x
VBAT
V
Thermal-Shutdown Threshold
TSHDN
Receiver-Threshold Center
Voltage
Thermal-Shutdown Hysteresis
0.4 x VBAT
V
V
+165
°C
10
°C
ESD PROTECTION
4
Human Body Model
LIN
±12
kV
Contact Discharge
IEC61000-4-2
LIN, NWAKE, BAT
(tested to IBEE test setup)
C1 = 100nF on VBAT,
C2 = 220pF on LIN,
R = 33kΩ on NWAKE
±4
kV
Maxim Integrated
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.)
PARAMETER
LIN Duty Factor 1
D1 = tBUS(REC)(MAX)/(2 x tBIT)
LIN Duty Factor 2
D2 = tBUS(REC)(MAX)/(2 x tBIT)
LIN Duty Factor 3
D3 = tBUS(REC)(MAX)/(2 x tBIT)
LIN Duty Factor 4
D4 = tBUS(REC)(MAX)/(2 x tBIT)
Propagation Delay of Receiving
Node
Receiver Propagation Delay
Symmetry
SYMBOL
CONDITIONS
D1
VBAT = +7V to +18V, Vth(REC)(MAX) =
0.744 x VBAT,
Vth(DOM)(MAX) = 0.581 x VBAT,
tBIT = 50µs (Figure 4, Note 2)
D2
VBAT = +8V to +18V,
Vth(REC)(MIN) = 0.422 x VBAT,
Vth(DOM)(MIN) = 0.284 x VBAT,
tBIT = 50µs (Figure 4, Note 2)
D3
VBAT = +7V to +18V,
Vth(REC)(MAX) = 0.778 x VBAT,
Vth(DOM)(MAX) = 0.616 x VBAT,
tBIT = 96µs (Figure 4, Note 2)
D4
Vth(REC)(MIN) = 0.389 x VBAT,
Vth(DOM)(MIN) = 0.251 x VBAT,
VBAT = +8V to +18V,
tBIT = 96µs (Figure 4, Note 2)
tp(RX)
tp(RX)(SYM)
MIN
TYP
MAX
0.396
—
0.581
0.417
-2
—
—
VBAT = +7V to +18V,
CRXD = 20pF (Figure 4)
Rising edge with respect to falling edge,
VBAT = +7V to +18V,
CRXD = 20pF, RRXD = 1kΩ
UNITS
0.590
—
6
µs
+2
µs
Continuously Dominant-Clamped
LIN Bus Detection Time
tLIN(DOM)(DET)
Normal/low slope mode (MAX13021),
VLIN = VGND
40
80
160
ms
Continuously Dominant-Clamped
LIN Bus Recovery Time
tLIN(DOM)(REC)
Normal/low slope mode (MAX13021),
VLIN = VGND
0.5
1
2
ms
Sleep mode (Figure 3)
30
70
150
µs
Normal/low slope mode,
VTXD = VGND
20
80
ms
Sleep mode
7
50
µs
Dominant Time for Wake-Up of
the LIN Transceiver
TXD Permanent Dominant
Disable Time
Dominant Time for Wake-Up
Through NWAKE
Maxim Integrated
tBUS
tTXD(DOM)(DIS)
tNWAKE
20
5
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.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Mode Change Time from
Sleep/Standby Mode to
Normal/Low Slope Mode
tGOTONORM
(Note 3)
2
5
10
µs
Mode Change Time from
Normal/Low Slope Mode to Sleep
Mode
tGOTOSLEEP
(Note 4)
2
5
10
µs
Note 1: Guaranteed by design for VBAT = VLIN = +27V.
Note 2: Selected bit time, tBIT = 50µs or 96µs (20kbaud or 10.4kbaud). Bus load conditions (CBUS / RBUS): 1nF/1kΩ, 6.8nF/660Ω,
10nF/500Ω.
Note 3: tGOTONORM is measured from rising edge of NSLP to RXD active.
Note 4: tGOTOSLEEP is measured from falling edge of NSLP to RXD high impedance.
Typical Operating Characteristics
(VBAT = +12V and TA = +25°C, unless otherwise noted.)
7
6
5
4
3
VBAT = +38V
VBAT = +12V
35
30
25
20
RL = 1000Ω
CL = 1nF
15
10
1
5
TEMPERATURE (°C)
TA = -40°C
25
TA = +25°C
20
TA = +125°C
15
10
5
LOW SLOPE MODE
10.4kbps
0
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
30
MAX13020 toc02
NORMAL SLOPE MODE
20kbps
40
2
0
6
45
RL = 500Ω
CL = 10nF
SINK CURRENT (mA)
SUPPLY CURRENT (mA)
8
50
OPERATING CURRENT (mA)
SLEEP MODE
VLIN = VBAT
9
MAX13020 toc01
10
SINK CURRENT vs. RXD OUTPUT
LOW VOLTAGE
OPERATING CURRENT
vs. SUPPLY VOLTAGE
MAX13020 toc03
SUPPLY CURRENT
vs. TEMPERATURE
5
10
15
20
25
30
SUPPLY VOLTAGE (V)
35
40
0
1
2
3
4
5
RXD OUTPUT LOW VOLTAGE (V)
Maxim Integrated
MAX13020/MAX13021
±60V Fault-Protected LIN Transceivers
Typical Operating Characteristics (continued)
(VBAT = +12V and TA = +25°C, unless otherwise noted.)
35
TA = -40°C
30
TA = +25°C
25
INH ON-RESISTANCE (Ω)
SINK CURRENT (mA)
40
TA = +125°C
20
15
ISINK = 15mA
45
40
35
VBAT = +12V
30
25
VBAT = +38V
20
15
100
80
70
50
40
30
10
20
5
5
10
0
0
1
2
3
4
5
MAX13020
VBAT = +12V
60
10
0
SLEEP MODE
VLIN = 0V
90
IBAT FAULT CURRENT (µA)
STANDBY MODE
AFTER A LOCAL
45
50
MAX13020 toc04
50
IBAT FAULT CURRENT
vs. TEMPERATURE
MAX13020 toc05
INH ON-RESISTANCE
vs. TEMPERATURE
MAX13020 toc06
SINK CURRENT vs. TXD PULLDOWN
OUTPUT VOLTAGE
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
-40 -25 -10 5 20 35 50 65 80 95 110 125
OUTPUT LOW VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
LIN OUTPUT SPECTRUM
LIN OUTPUT SPECTRUM
LIN TRANSMITTING NORMAL
SLOPE MODE
MAX13020 toc08
MAX13020 toc07
MAX13020 toc09
LIN
5V/div
LIN
5V/div
TX
5V/div
LIN
5V/div
FFT
20dB/div
FFT
20dB/div
10µs/div
2.5MHz/div
RL = 660Ω
CL = 6.8nF
NORMAL SCOPE MODE
20kbps
Maxim Integrated
RL = 660Ω
CL = 6.8nF
LOW SCOPE MODE
10.4kbps
20µs/div
2.5MHz/div
RX
5V/div
20µs/div
RL = 1kΩ
CL = 1nF
NORMAL SCOPE MODE
20kbps
7
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 = 6.8nF
NORMAL SCOPE MODE
20kbps
LIN TRANSMITTING LOW
SLOPE MODE
20µs/div
RL = 1kΩ
CL = 1nF
LOW SCOPE MODE
10.4kbps
LIN TRANSMITTING LOW
SLOPE MODE
MAX13020 toc13
MAX13020 toc14
TX
5V/div
TX
5V/div
LIN
5V/div
LIN
5V/div
RX
5V/div
RX
5V/div
20µs/div
RL = 660kΩ
CL = 6.8nF
LOW SCOPE MODE
10.4kbps
8
20µs/div
RL = 500kΩ
CL = 10nF
LOW SCOPE MODE
10.4kbps
Maxim Integrated
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. Drive TXD logic-low to force the LIN bus to a dominant state in
normal/low slope mode.
5
GND
Ground
6
LIN
LIN Bus I/O. LIN is terminated with an internal 30kΩ resistor in normal slope, low slope, and standby
modes.
7
BAT
Battery Voltage Input. Bypass BAT to ground with a 0.1µF ceramic capacitor as close to the device as
possible.
8
INH
Inhibit Output. INH is active high in standby and normal/low slope modes. (See Table 1)
Data Receive Output, Open Drain. RXD is logic-low when the LIN bus is dominant. RXD is active low after
a wake-up event from sleep mode.
Detailed Description
The MAX13020/MAX13021 ±60V fault-protected lowpower 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 controller 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 communication up to 20kbaud, and include slew-rate limited 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 functionally compatible with the Philips TJA1020. The
MAX13021 includes enhanced bus dominant clamping
fault-management for reduced quiescent current during
LIN bus shorts to GND.
Operating Modes
The MAX13020/MAX13021 provide two different transmitting modes, an intermediate standby mode and a
low-power sleep mode. Normal slope mode allows fullspeed communication at 20kbaud with a slew-limited
transmitter to reduce EME. Low slope mode permits
communication up to 10.4kbaud, and provides addiMaxim Integrated
t(NSLP = 1 AFTER 0 TO 1)
> tGOTONORM
TXD = 1
STANDBY MODE
t(NSLP = 1 AFTER 0 TO 1)
> tGOTONORM
TXD = 0
(t
NORMAL SLOPE MODE
t(NSLP = 1 AFTER 0 TO 1)
> tGOTONORM
TXD = 1
NWAKE = 0 AFTER 1 TO 0) > tNWAKE
OR
t(LIN = 0 AFTER 1 TO 0) >tBUS
t(NSLP = 0 AFTER 1 TO 0)
> tGOTOSLEEP
t(NSLP = 0 AFTER 1 TO 0)
> tGOTOSLEEP
LOW SLOPE MODE
SLEEP MODE
t(NSLP = 1 AFTER 0 TO 1)
> tGOTONORM
TXD = 0
INITIAL
POWER-ON STATE
Figure 1. MAX13020 Operating Modes
tional slew-rate limiting to further reduce EME. The
transmitting operating mode is selected by the logic
state of NSLP and TXD (Table 1). To enter normal slope
mode or low slope mode, drive TXD logic-high or logiclow, then drive NSLP logic-high for longer than
tGOTONORM. The MAX13021 features two additional
operating modes to reduce current consumption during
LIN bus shorts to GND.
On initial power-up, the device enters sleep mode.
9
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
(tNWAKE = 0 AFTER 1 TO 0) > tNWAKE
OR
t(LIN = 0 AFTER 1 TO 0) >tBUS
t(NSLP = 0 AFTER 1 TO 0)
> tGOTOSLEEP
LOW SLOPE MODE
SLEEP MODE
t(NSLP = 1 AFTER 0 TO 1)
> tGOTONORM
TXD = 0
t(LIN = RECESSIVE)
> tLIN(DOM)(REC)
INITIAL
POWER-ON STATE
Figure 2. MAX13021 Operating Modes
Sleep Mode
Sleep mode is the lowest power operating mode and is
the default state after power is applied to BAT. In sleep
mode, the MAX13020/MAX13021 disable the LIN transmitter and receiver to reduce power consumption. RXD
and INH are high impedance. The internal slave termination resistor between LIN and BAT is disabled, and
only a weak pullup from LIN to BAT is enabled. While in
sleep mode, the MAX13020/MAX13021 transition to
standby mode when a local or remote wake-up event is
detected. For applications with a continuously powered
microprocessor, drive NSLP logic-high for longer than
tGOTONORM to force the MAX13020/MAX13021 directly
into normal slope mode if TXD is logic-high, and low
slope mode if TXD is logic-low. From normal slope or
low slope mode, drive NSLP logic-low for longer than
t GOTOSLEEP to force the MAX13020/MAX13021 into
sleep mode.
Standby Mode
In standby mode, the LIN transmitter and receiver are
disabled, the internal slave termination resistor between
LIN and BAT is enabled, and the INH output is pulled
high. The MAX13020/MAX13021 transition to standby
mode from sleep mode when a wake-up event is
detected. From standby mode, drive TXD logic-high or
logic-low, then drive NSLP logic-high for longer than
tGOTONORM to transition to normal slope or low slope
10
mode. In standby mode, RXD is driven logic-low to
transmit the wake-up interrupt flag to a microcontroller.
The wake-up source flag is presented on TXD as a
strong pulldown in the case of a local wake-up. In the
case of a remote wake-up, TXD is pulled low by the
internal 330kΩ resistor only. The wake-up interrupt and
wake-up source flag are cleared when the
MAX13020/MAX13021 transition to normal slope mode
or low slope mode.
Normal Slope Mode
In normal slope mode, the MAX13020/MAX13021 provide the physical layer interface to a LIN bus through
RXD and TXD. INH is pulled high and the internal slave
termination resistance from LIN to BAT is enabled. Data
presented on TXD is transmitted on the LIN bus with a
controlled slew rate to limit EME. Drive TXD logic-low to
assert a dominant state on LIN. The LIN bus state is
presented on the open-drain output RXD. A dominant
LIN state produces a logic-low on RXD. From standby
or sleep mode, drive TXD logic-high, then drive NSLP
logic-high for longer than tGOTONORM to enter normal
slope mode. Drive NSLP logic-low for longer than
tGOTOSLEEP to force the device into sleep mode from
normal slope mode.
Maxim Integrated
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. Drive NSLP
logic-low for longer than t GOTOSLEEP to force the
device into sleep mode from low slope mode.
LIN Bus Dominant Management
(MAX13021)
The MAX13021 provides two additional states to implement reduced current consumption during a LIN-toGND short condition. When the MAX13021 detects a
dominant-clamped fault on LIN, the device disables the
transmitter and enters a low-power fail-safe mode. The
receiver is disabled and a low-power comparator is
enabled to monitor the LIN bus. When a recessive state
is detected on LIN, the device exits fault mode and
returns to standby mode.
Fault Mode (MAX13021)
The device enters fault mode from normal slope or low
slope mode when a dominant state is detected on LIN
for longer than tLIN(DOM)(DET). In fault mode, the slave
termination resistor from LIN to BAT is disconnected,
and the LIN transmitter and receiver are disabled to
reduce power consumption. INH output remains pulled
high. A low-power comparator is enabled to monitor the
LIN bus. Fault mode is cleared, and the MAX13021
enters standby mode when a recessive state is detected on LIN for longer than tLIN(DOM)(REC).
Disable Mode (MAX13021)
The MAX13021 enters disable mode from fault mode
after NSLP is driven logic-low for longer than
tGOTOSLEEP. The INH output is high impedance in disable mode to reduce current consumption. The LIN
transmitter and receiver are disabled, and the slave termination resistor from LIN to BAT is disconnected. A
low-power comparator is enabled to monitor the LIN
bus. The MAX13021 enters fault mode when NSLP is
driven logic-high for longer than t GOTONORM . The
device enters sleep mode if a recessive state is detected on LIN for longer than tLIN(DOM)(REC).
Local and Remote Wake-Up Events
The MAX13020/MAX13021 recognize local and remote
wake-up events from sleep mode. The MAX13021 also
recognizes local wake-up events from disable mode. A
local wake-up event is detected when NWAKE is held
at logic-low for longer than tGOTONORM after a falling
edge. NWAKE is internally pulled up to BAT with a
Table 1. Operating Modes
NSLP
TXD
PULLDOWN
RXD
INH
TRANSMITTER
RECEIVER
SLEEP
0
330kΩ
High-Z
High-Z
Disabled
Disabled
No wake-up events detected
STANDBY
0
330kΩ or
strong
pulldown
0
1
Disabled
Disabled
Wake-up detected from sleep
mode. TXD indicates wake-up
source. (Note 1)
NORMAL
SLOPE
1
330kΩ
LIN
1
Normal slope
Enabled
(Notes 2, 3, 4)
(Notes 2, 3, 5)
MODE
COMMENTS
LOW SLOPE
1
330kΩ
LIN
1
Low slope
Enabled
FAULT*
1
330kΩ
LIN
1
Disabled
Low power
—
DISABLE*
0
330kΩ
LIN
High-Z
Disabled
Low power
—
*MAX13021 only.
High-Z = High impedance.
Note 1: Standby mode is entered automatically after a local or remote wake-up event from sleep mode. INH and the 30kΩ termination resistor on LIN are enabled.
Note 2: The internal wake-up source flag on TXD is cleared upon entering normal slope or low slope mode.
Note 3: The internal wake-up interrupt flag on RXD is cleared upon entering normal slope or low slope mode.
Note 4: Drive NSLP high for longer than tGOTONORM with TXD logic-high to enter normal slope mode.
Note 5: Drive NSLP high for longer than tGOTONORM with TXD logic-low to enter low slope mode.
Maxim Integrated
11
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).
Wake-Up Source Recognition
When a wake-up event is detected, the MAX13020/
MAX13021 enter standby mode and present the wake-up
interrupt on RXD as a logic-low. The wake-up source flag
is presented on TXD as a strong pulldown in the case of a
local wake-up. In the case of a remote wake-up, TXD is
pulled low by the internal 330kΩ resistor only. To read the
wake-up source flag, pull TXD high with an external
pullup resistor (see Reading the Wake-Up Source Flag
section.) The wake-up interrupt and wake-up source flag
are cleared when the MAX13020/MAX13021 transition to
normal slope mode or low slope mode. The thermal-shutdown circuit forces the driver outputs into high-impedance state if the die temperature exceeds +160°C.
Normal operation resumes when the die temperature
cools to +140°C.
Fail-Safe Features
The MAX13020/MAX13021 include a number of failsafe features to handle fault conditions. Internal pulldowns are provided on control inputs TXD and NSLP to
force the device into a known state in the event that
these inputs are disconnected.
LIN Short-Circuit Protection
The LIN transmitter is current-limited to prevent damage from LIN-to-BAT shorts.
TXD Dominant Timeout
If TXD is shorted to GND or is otherwise held low, the
resulting dominant LIN state blocks traffic on the LIN
bus. In normal slope and low slope modes, the LIN
transmitter is disabled if TXD is held at logic-low for
longer than t TXD(DOM)(DIS) . The transmitter is reenabled on the next rising edge on TXD.
Loss of Power
If BAT or GND are disconnected, interrupting power to
the MAX13020/MAX13021, LIN remains high impedance to avoid loading the LIN bus. Additionally, RXD is
12
LIN RECESSIVE
VLIN
0.4 x VBAT
0.6 x VBAT
tBUS
LIN DOMINANT
SLEEP MODE
STANDBY
MODE
Figure 3. Remote Wake-Up Timing
high impedance when BAT is disconnected, preventing
current flow from a connected microcontroller.
LIN Bus Dominant Management (MAX13021)
The MAX13021 provides LIN bus dominant management protection to reduce current consumption during
a LIN-to-GND short condition. When the LIN-to-GND
short is cleared, and a recessive LIN state is detected,
the MAX13021 returns to standby or sleep mode.
ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against ESDs
encountered during handling and assembly. The LIN,
NWAKE, and BAT pins are protected up to ±4kV as
measured by the IEC61000-4-4 Contact Discharge
Model. LIN is protected to ±12kV Human Body Model.
Protection structures prevent damage caused by ESD
events in all operating modes and when the device is
unpowered.
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report documenting test
setup, methodology, and results.
Applications Information
Master LIN Nodes
Configure the MAX13020/MAX13021 as a master LIN
node by connecting a 1kΩ resistor from LIN to INH with
a blocking diode (see the Typical Operating Circuit.)
INH is held at a logic-high level in normal slope, low
slope, standby, and fault (MAX13021) modes. INH is
high impedance in sleep mode and disable mode
(MAX13021) to reduce power consumption.
Maxim Integrated
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. LIN Waveform Definition
Reading the Wake-Up Source Flag
When a wake-up event is detected in sleep mode, the
MAX13020/MAX13021 transition to standby mode and
present the wake-up source flag on TXD as a strong
pulldown in the case of a local wake-up. In the case of
a remote wake-up event, TXD is pulled to ground only
by an internal resistor. The wake-up source flag can be
determined by connecting a pullup resistor to TXD.
Choose the external pullup resistor such that TXD is a
logic-high when a remote wake-up occurs, and when a
local wake-up occurs and the strong pulldown drives
TXD low.
0.1µF
BAT
NWAKE
NSLP
INH
MAX13020
MAX13021
RL
CL
+5V
TXD
LIN
RXD
GND
Figure 5. Test Circuit for AC Characteristics
Maxim Integrated
13
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
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.
Package drawings may show a different suffix character, but the
drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE NO.
LAND
PATTERN NO.
8 SO
S8+5
21-0041
90-0096
15
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. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
16 ________________________________Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
© 2012 Maxim Integrated Products, Inc.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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