TJA1028
LIN transceiver with integrated voltage regulator
Rev. 3 — 19 May 2011
Product data sheet
1. General description
The TJA1028 is a LIN 2.0/2.1/SAE J2602 transceiver with an integrated low-drop voltage
regulator. The voltage regulator can deliver up to 70 mA and is available in 3.3 V and
5.0 V variants. TJA1028 facilitates the development of compact nodes in Local
Interconnect Network (LIN) bus systems. To support robust designs, the TJA1028 offers
strong ElectroStatic Discharge (ESD) performance and can withstand high voltages on the
LIN bus. In order to minimize current consumption, the TJA1028 supports a Sleep mode
in which the LIN transceiver and the voltage regulator are powered down while still having
wake-up capability via the LIN bus.
The TJA1028 comes in an SO8 package, and also in a 3 mm
×
3 mm HVSON8 package
that reduces the required board space by over 70 %. This feature can prove extremely
valuable when board space is limited.
2. Features and benefits
LIN 2.0/2.1 compliant
SAE J2602 compliant
Downward compatible with LIN 1.3
Internal LIN slave termination resistor
Voltage regulator offering 5 V or 3.3 V, 70 mA capability
±2
% voltage regulator accuracy over specified temperature and supply ranges
Voltage regulator output undervoltage detection with reset output
Voltage regulator is short-circuit proof to ground
Voltage regulator stable with ceramic, tantalum and aluminum electrolyte capacitors
Robust ESD performance;
±8
kV according to IEC61000-4-2 for pins LIN and V
BAT
Pins LIN and V
BAT
protected against transients in the automotive environment
(ISO 7637)
Very low LIN bus leakage current of < 2
μA
when battery not connected
LIN pin short-circuit proof to battery and ground
Transmit data (TXD) dominant time-out function
Thermally protected
Very low ElectroMagnetic Emission (EME)
High ElectroMagnetic Immunity (EMI)
Typical Standby mode current of 45
μA
Typical Sleep mode current of 12
μA
LIN bus wake-up function
K-line compatible
Available in SO8 and HVSON8 packages
NXP Semiconductors
TJA1028
LIN transceiver with integrated voltage regulator
Leadless HVSON8 package (3.0 mm
×
3.0 mm) with improved Automated Optical
Inspection (AOI) capability
Dark green product (halogen free and Restriction of Hazardous Substances (RoHS)
compliant)
3. Ordering information
Table 1.
Ordering information
Package
Name
TJA1028T/xxx/xx
[1][2]
TJA1028TK/xxx/xx
[1][2]
SO8
HVSON8
Description
plastic small outline package; 8 leads; body width 3.9 mm
plastic thermal enhanced very thin small outline package; no leads;
8 terminals; body 3
×
3
×
0.85 mm
Version
SOT96-1
SOT782-1
Type number
[1]
[2]
TJA1028T/5V0/xx and TJA1028TK/5V0/xx for the versions with the 5 V regulator; TJA1028T/3V3/xx and TJA1028TK/3V3/xx for the
versions with the 3.3 V regulator.
TJA1028T/xxx/20 and TJA1028TK/xxx/20 for the normal slope versions that support baud rates up to 20 kBd; TJA1028T/xxx/10 and
TJA1028TK/xxx/10 for the low slope versions that support baud rates up to 10.4 kBd (SAE J2602).
4. Marking
Table 2.
Marking codes
Marking
1028/51
1028/52
1028/31
1028/32
28/51
28/52
28/31
28/32
Type number
TJA1028T/5V0/10
TJA1028T/5V0/20
TJA1028T/3V3/10
TJA1028T/3V3/20
TJA1028TK/5V0/10
TJA1028TK/5V0/20
TJA1028TK/3V3/10
TJA1028TK/3V3/20
TJA1028
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 19 May 2011
2 of 24
NXP Semiconductors
TJA1028
LIN transceiver with integrated voltage regulator
5. Block diagram
V
BAT
VOLTAGE
REFERENCE
V
BAT
UV
DET
V
CC
VREG
V
CC
UV
DET
EN
V
BAT
OVERTEMP
DETECTION
GND
CONTROL
RSTN
LIN
Rx
RXD
V
CC
Tx
LIN
TXD
TIMEOUT
TIMER
TJA1028
TXD
GND
015aaa085
Fig 1.
Block diagram
TJA1028
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 19 May 2011
3 of 24
NXP Semiconductors
TJA1028
LIN transceiver with integrated voltage regulator
6. Pinning information
6.1 Pinning
terminal 1
index area
V
BAT
EN
V
BAT
EN
GND
LIN
1
2
8
7
V
CC
GND
RSTN
TXD
RXD
LIN
4
5
RXD
1
2
8
7
V
CC
RSTN
TXD
TJA1028TK
3
6
TJA1028T
3
4
015aaa082
6
5
015aaa244
Transparent top view
a. TJA1028T/xxx/xx: SO8
Fig 2.
Pin configuration diagrams
b. TJA1028TK/xxx/xx: HVSON8
6.2 Pin description
Table 3.
Symbol
V
BAT
EN
GND
LIN
RXD
TXD
RSTN
V
CC
[1]
Pin description
Pin
1
2
3
[1]
4
5
6
7
8
Description
battery supply for the TJA1028
enable input
ground
LIN bus line
LIN receive data output
LIN transmit data input
reset output (active LOW)
voltage regulator output
HVSON8 package die supply ground is connected to both the GND pin and the exposed center pad. The
GND pin must be soldered to board ground. For enhanced thermal and electrical performance, it is
recommended that the exposed center pad also be soldered to board ground.
7. Functional description
The TJA1028 combines the functionality of a LIN transceiver and a voltage regulator in a
single chip and offers wake-up by bus activity. The voltage regulator is designed to power
the Electronic Control Unit’s (ECU) microcontroller and its peripherals.
The TJA1028 is the interface between a LIN master/slave protocol controller and the
physical bus in a LIN network. It is LIN 2.0/2.1/SAE J2602 compliant and achieves
optimum ElectroMagnetic Compatibility (EMC) performance by wave shaping the LIN
output.
TJA1028
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 19 May 2011
4 of 24
NXP Semiconductors
TJA1028
LIN transceiver with integrated voltage regulator
The TJA1028T/xxx/20 and TJA1028TK/xxx/20 versions are optimized for a speed of
20 kBd, the maximum specified in the LIN standard. The TJA1028T/xxx/10 and
TJA1028TK/xxx/10 versions are optimized for a transmission speed of 10.4 kBd, as
specified in SAE J2602.
7.1 Operating modes
The TJA1028 supports four operating modes: Normal, Standby, Sleep and Off. The
operating modes, and the transitions between modes, are illustrated in
Figure 3.
AII states
V
BAT
< V
th(det)poff
OR
T
vj
> T
th(act)otp
remote
wake-up
OFF
LIN = off
RXD = floating
RSTN = LOW
V
BAT
> V
th(det)pon AND
T
vj
< T
th(rel)otp
STANDBY
LIN = off
(RXD signals
wake source)
EN = 1 AND
RSTN = 1
EN = 1 0 AND
TXD = 1 AND
RSTN = 1
NORMAL
(1)
LIN = on
EN = 1
0 AND
(3)
EN = 1 TXD = 0 AND
RSTN = 1
wake-up
(3)
event
SLEEP
LIN = off
RXD = V
CC(2)
RSTN = LOW
015aaa086
Voltage regulator - on
Voltage regulator - off
(1) In Normal mode, the LIN transmitter is enabled - but if EN and/or RSTN go LOW, the LIN
transmitter will be disabled. Remote wake-up signalling will be activated.
(2) Until V
CC
drops below 2 V.
(3) If a wake-up event and a go-to-sleep event occur simultaneously, the device will switch directly to
Standby mode without initiating a reset.
Fig 3.
State diagram
7.1.1 Off mode
The TJA1028 switches to Off mode from all other modes if the battery supply voltage
drops below the power-off detection threshold (V
th(det)poff
) or the junction temperature
exceeds the overtemperature protection activation threshold (T
th(act)otp
).
The voltage regulator and the LIN physical layer are disabled in Off mode, and pin RSTN
is forced LOW.
7.1.2 Standby mode
Standby mode is a low-power mode that guarantees very low current consumption.
TJA1028
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 19 May 2011
5 of 24
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