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PDF MAX13021 Data sheet ( Hoja de datos )
| Número de pieza | MAX13021 | |
| Descripción | (MAX13020 / MAX13021) Fault Protected LIN Transceivers | |
| Fabricantes | Maxim Integrated Products | |
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19-0559; Rev 1; 6/06
±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.
www.DataSheeTwth4itUeh.cadoemsvinicgeles
are intended for in-vehicle
master and multiple slaves.
subnetworks
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
Ordering Information
PART
LIN BUS
DOMINANT
MANAGEMENT
PIN-
PACKAGE
PACKAGE
CODE
MAX13020ASA+
— 8 SO
S8-5
MAX13021ASA+
Yes 8 SO
S8-5
Note: All devices are specified over the -40°C to +125°C auto-
motive temperature range.
+Denotes lead-free package.
MAX5023
+5V LDO
EN
VBAT
Typical Operating Circuit
LIN
BUS
MICROCONTROLLER
* INH BAT NWAKE
MAX13020
MAX13021
TXD
RXD
NSLP
GND
LIN
MASTER NODE
ONLY
1kΩ
*OPTIONAL TXD PULLUP RESISTOR FOR READING WAKE-UP SOURCE FLAG
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
±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
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
LIN Duty Factor 1
D1 = tBUS(REC)(MAX)/(2 x tBIT)
www.DataSheet4U.com
LIN Duty Factor 2
D2 = tBUS(REC)(MAX)/(2 x tBIT)
VBAT = +7V to +18V, Vth(REC)(MAX) =
D1 0.744 x VBAT,
Vth(DOM)(MAX) = 0.581 x VBAT,
0.396
tBIT = 50µs (Figure 4, Note 2)
VBAT = +8V to +18V,
D2 Vth(REC)(MIN) = 0.422 x VBAT,
Vth(DOM)(MIN) = 0.284 x VBAT,
tBIT = 50µs (Figure 4, Note 2)
—
0.581
—
LIN Duty Factor 3
D3 = tBUS(REC)(MAX)/(2 x tBIT)
VBAT = +7V to +18V,
D3 Vth(REC)(MAX) = 0.778 x VBAT,
Vth(DOM)(MAX) = 0.616 x VBAT,
tBIT = 96µs (Figure 4, Note 2)
0.417
—
LIN Duty Factor 4
D4 = tBUS(REC)(MAX)/(2 x tBIT)
Vth(REC)(MIN) = 0.389 x VBAT,
D4 Vth(DOM)(MIN) = 0.251 x VBAT,
VBAT = +8V to +18V,
tBIT = 96µs (Figure 4, Note 2)
0.590
—
Propagation Delay of Receiving
Node
tp(RX)
VBAT = +7V to +18V,
CRXD = 20pF (Figure 4)
6 µs
Receiver Propagation Delay
Symmetry
Continuously Dominant-Clamped
LIN Bus Detection Time
Continuously Dominant-Clamped
LIN Bus Recovery Time
Dominant Time for Wake-Up of
the LIN Transceiver
TXD Permanent Dominant
Disable Time
Dominant Time for Wake-Up
Through NWAKE
tp(RX)(SYM)
Rising edge with respect to falling edge,
VBAT = +7V to +18V,
CRXD = 20pF, RRXD = 1kΩ
tLIN(DOM)(DET)
Normal/low slope mode (MAX13021),
VLIN = GND
tLIN(DOM)(REC)
Normal/low slope mode (MAX13021),
VLIN = GND
tBUS
Sleep mode (Figure 3)
tTXD(DOM)(DIS)
Normal/low slope mode,
VTXD = GND
tNWAKE
Sleep mode
-2
40
0.5
30
20
7
+2
80 160
12
70 150
80
20 50
µs
ms
ms
µs
ms
µs
_______________________________________________________________________________________ 5
5 Page 
±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
www.DataSheelot4gUi.cco-mlow for longer than tGOTOSLEEP to force the
device into sleep mode from low slope mode.
LIN Bus Dominant Management
(MAX13021)
The MAX13021 provides two additional states to imple-
ment reduced current consumption during a LIN-to-
GND 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 detect-
ed 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 dis-
able mode to reduce current consumption. The LIN
transmitter and receiver are disabled, and the slave ter-
mination 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 tGOTONORM. The
device enters sleep mode if a recessive state is detect-
ed 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
MODE
SLEEP
STANDBY
NSLP
0
0
TXD
PULLDOWN
330kΩ
330kΩ or
strong
pulldown
RXD
High-Z
0
INH TRANSMITTER RECEIVER
COMMENTS
High-Z
1
Disabled
Disabled
Disabled
Disabled
No wake-up events detected
Wake-up detected from sleep
mode. TXD indicates wake-up
source. (Note 1)
NORMAL 1 330kΩ
SLOPE
LOW SLOPE 1
330kΩ
FAULT*
1 330kΩ
DISABLE*
0
330kΩ
*MAX13021 only.
High-Z = High impedance.
LIN
1
Normal slope
Enabled (Notes 2, 3, 4)
LIN 1
LIN 1
LIN High-Z
Low slope
Disabled
Disabled
Enabled
Low power
Low power
(Notes 2, 3, 5)
—
—
Note 1: Standby mode is entered automatically after a local or remote wake-up event from sleep mode. INH and the 30kΩ termina-
tion 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.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX13021.PDF ] | |
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