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부품번호 TJA1021 기능
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TJA1021 데이터시트, 핀배열, 회로
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TJA1021
LIN 2.0/SAE J2602 transceiver
Rev. 01 — 16 October 2006
Objective data sheet
1. General description
The TJA1021 is the interface between the Local Interconnect Network (LIN) master/slave
protocol controller and the physical bus in a LIN. It is primarily intended for in-vehicle
sub-networks using baud rates from 1 kBd up to 20 kBd and is LIN 2.0/SAE J2602
compliant. The TJA1021 is pin-to-pin compatible with the TJA1020 and improved on
ElectroStatic Discharge (ESD).
The transmit data stream of the protocol controller at the transmit data input (TXD) is
converted by the TJA1021 into a bus signal with optimized slew rate and wave shaping to
minimize ElectroMagnetic Emission (EME). The LIN bus output pin is pulled HIGH via an
internal termination resistor. For a master application an external resistor in series with a
diode should be connected between pin INH or pin VBAT and pin LIN. The receiver detects
the data stream at the LIN bus input pin and transfers it via pin RXD to the microcontroller.
In sleep mode the power consumption of the TJA1021 is very low, whereas in failure
modes the power consumption is reduced to a minimum.
2. Features
2.1 General
I LIN 2.0/SAE J2602 compliant
I Baud rate up to 20 kBd
I Very low ElectroMagnetic Emission (EME)
I High ElectroMagnetic Immunity (EMI)
I Passive behavior in unpowered state
I Input levels compatible with 3.3 V and 5 V devices
I Integrated termination resistor for LIN slave applications
I Wake-up source recognition (local or remote)
I Supports K-line like functions
I Pin-to-pin compatible with TJA1020
2.2 Low power management
I Very low current consumption in sleep mode with local and remote wake-up
2.3 Protections
I High ESD robustness: ≥ ±6 kV according to IEC 61000-4-2 for pins LIN, VBAT and
WAKE_N
I Transmit data (TXD) dominant time-out function
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TJA1021 pdf, 반도체, 판매, 대치품
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NXP Semiconductors
TJA1021
LIN 2.0/SAE J2602 transceiver
6.2 Pin description
Table 3.
Symbol
RXD
Pin description
Pin
1
SLP_N
2
WAKE_N
TXD
GND
LIN
VBAT
INH
3
4
5
6
7
8
Description
receive data output (open-drain); active LOW after a wake-up
event
sleep control input (active LOW); controls inhibit output; resets
wake-up source flag on TXD and wake-up request on RXD
local wake-up input (active LOW); negative edge triggered
transmit data input; active LOW output after a local wake-up event
ground
LIN bus line input/output
battery supply
battery related inhibit output for controlling an external voltage
regulator; active HIGH after a wake-up event
Table 4.
Symbol
RXD
Bonding pad description
Pad
X[1]
Y[1]
1 <tbd> <tbd>
SLP_N
2
<tbd> <tbd>
WAKE_N
TXD
GND
LIN
VBAT
INH
3
4
5
6
7
8
<tbd>
<tbd>
<tbd>
<tbd>
<tbd>
<tbd>
<tbd>
<tbd>
<tbd>
<tbd>
<tbd>
<tbd>
Description
receive data output (open-drain); active LOW
after a wake-up event
sleep control input (active LOW); controls inhibit
output; resets wake-up source flag on TXD and
wake-up request on RXD
local wake-up input (active LOW); negative
edge triggered
transmit data input; active LOW output after a
local wake-up event
ground
LIN bus line input/output
battery supply
battery related inhibit output for controlling an
external voltage regulator; active HIGH after a
wake-up event
[1] All coordinates (µm) represent the position of the center of each pad with respect to the bottom left-hand
corner of the top aluminium layer (see Figure 3).
7. Functional description
The TJA1021 is the interface between the LIN master/slave protocol controller and the
physical bus in a Local Interconnect Network (LIN). The TJA1021 is LIN 2.0/SAE J2602
compliant and provides optimum ElectroMagnetic Compatibility (EMC) performance due
to wave shaping of the LIN output.
The /20 version of the TJA1021 is optimized for the maximum specified LIN transmission
speed of 20 kBd; the /10 version of the TJA1021 is optimized for the LIN transmission
speed of 10.4 kBd as specified by the SAE J2602.
TJA1021_1
Objective data sheet
DataSheet4 U .com
Rev. 01 — 16 October 2006
© NXP B.V. 2006. All rights reserved.
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TJA1021 전자부품, 판매, 대치품
www.DataSheet4U.com
NXP Semiconductors
TJA1021
LIN 2.0/SAE J2602 transceiver
7.4 Normal mode
In the normal mode the TJA1021 is able to transmit and receive data via the LIN bus line.
The receiver detects the data stream at the LIN bus input pin and transfers it via pin RXD
to the microcontroller (see Figure 1): HIGH at a recessive level and LOW at a dominant
level on the bus. The receiver has a supply voltage related threshold with hysteresis and
an integrated filter to suppress bus line noise. The transmit data stream of the protocol
controller at the TXD input is converted by the transmitter into a bus signal with optimized
slew rate and wave shaping to minimize EME. The LIN bus output pin is pulled HIGH via
an internal slave termination resistor. For a master application an external resistor in
series with a diode should be connected between pin INH or VBAT on one side and pin LIN
on the other side (see Figure 7).
Being in the sleep, standby or Power-up mode, the TJA1021 enters normal mode
whenever a HIGH level on pin SLP_N is maintained for a time of at least tgotonorm.
The TJA1021 switches to sleep mode in case of a LOW-level on pin SLP_N, maintained
for a time of at least tgotosleep.
7.5 Wake-up
When VBAT exceeds the power-on reset threshold voltage Vth(POR)H, the TJA1021 enters
the power-on mode. Though the TJA1021 is powered-up and INH is HIGH, both the
transmitter and receiver are still inactive. If SLP_N = 1 for t > tgotonorm, the TJA1021 enters
normal mode.
There are three ways to wake-up a TJA1021 which is in sleep mode:
1. Remote wake-up via a dominant bus state
2. Local wake-up via a negative edge at pin WAKE_N
3. Mode change (pin SLP_N is HIGH) from sleep mode to normal mode
7.6 Remote and local wake-up
A falling edge at pin WAKE_N followed by a LOW-level maintained for a certain time
period (twake(dom)WAKE_N) results in a local wake-up. The pin WAKE_N provides an internal
pull-up towards pin VBAT. In order to prevent EMI issues, it is recommended to connect an
unused pin WAKE_N to pin VBAT.
A falling edge at pin LIN followed by a LOW-level maintained for a certain time period
(tdom(LIN)) and a rising edge at pin LIN respectively (see Figure 5) results in a remote
wake-up. It should be noted that the time period tdom(LIN) is measured either in normal
mode while TXD is HIGH, or in sleep mode irrespective of the status of pin TXD.
After a local or remote wake-up, pin INH is activated (it goes HIGH) and the internal slave
termination resistor is switched on. The wake-up request is indicated by a LOW active
wake-up request signal on pin RXD to interrupt the microcontroller.
7.7 Wake-up via mode transition
It is also possible to set pin INH HIGH with a mode transition towards normal mode via pin
SLP_N. This is useful for applications with a continuously powered microcontroller.
TJA1021_1
Objective data sheet
Rev. 01 — 16 October 2006
© NXP B.V. 2006. All rights reserved.
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