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PDF TJA1028 Data sheet ( Hoja de datos )
| Número de pieza | TJA1028 | |
| Descripción | LIN transceiver | |
| Fabricantes | NXP Semiconductors | |
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TJA1028
LIN transceiver with integrated voltage regulator
Rev. 2 — 25 February 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 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
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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 VBAT
Pins LIN and VBAT 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
Available in SO8 and HVSON8 packages
Leadless HVSON8 package with wettable sides
1 page  
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
VBAT < Vth(det)poff OR
Tvj > Tth(act)otp
OFF
LIN = off
RXD = floating
RSTN = LOW
VBAT > Vth(det)pon AND
Tvj < Tth(rel)otp
remote
wake-up
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
Voltage regulator - on
Voltage regulator - off
wake-up(3)
event
EN = 1 0 AND(3)
EN = 1 TXD = 0 AND
RSTN = 1
SLEEP
LIN = off
RXD = VCC(2)
RSTN = LOW
015aaa086
(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 VCC 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 (Vth(det)poff) or the junction temperature
exceeds the overtemperature protection activation threshold (Tth(act)otp).
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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
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 25 February 2011
© NXP B.V. 2011. All rights reserved.
5 of 24
5 Page 
NXP Semiconductors
TJA1028
LIN transceiver with integrated voltage regulator
Table 6. Static characteristics …continued
VBAT = 5.5 V to 28 V; Tvj = −40 °C to +150 °C; RL(LIN-VBAT) = 500 Ω; all voltages are defined with respect to ground; positive
currents flow into the IC; typical values are given at VBAT = 12 V; unless otherwise specified.
Symbol
Parameter
Conditions
Min Typ Max Unit
LIN transmit data input; pin TXD
Vth(sw)
switching threshold voltage VCC = 2.97 V to 5.5 V
Vhys(i)
input hysteresis voltage
Rpu pull-up resistance
LIN receive data output; pin RXD
VCC = 2.97 V to 5.5 V
0.3 ×
VCC
200
5
-
-
12
0.7 ×
VCC
-
25
V
mV
kΩ
IOH HIGH-level output current
IOL LOW-level output current
Enable input; pin EN
Normal mode;
VLIN = VBAT; VRXD = VCC − 0.4 V
Normal mode;
VLIN = GND; VRXD = 0.4 V
--
0.4 -
−0.4 mA
- mA
Vth(sw)
switching threshold voltage
Rpd pull-down resistance
Reset output; pin RSTN
0.8 -
2V
50 130 400 kΩ
Rpu pull-up resistance
IOL LOW-level output current
VOL LOW-level output voltage
VOH HIGH-level output voltage
LIN bus line; pin LIN
VRSTN = VCC − 0.4 V;
VCC = 2.97 V to 5.5 V
VRSTN = 0.4 V; VCC = 2.97 V to 5.5 V;
−40 °C < Tvj < 195 °C
VCC = 2.5 V to 5.5 V;
−40 °C < Tvj < 195 °C
−40 °C < Tvj < 195 °C
3-
3.2 -
0-
0.8 ×
VCC
-
12 kΩ
40 mA
0.5 V
VCC + V
0.3
IBUS_LIM
current limitation for driver
dominant state
VBAT = VLIN = 18 V; VTXD = 0 V
40 -
100 mA
IBUS_PAS_rec receiver recessive input
leakage current
VLIN = 18 V; VBAT = 5.5 V; VTXD = VCC
-
- 2 μA
IBUS_PAS_dom receiver dominant input
leakage current including
pull-up resistor
Normal mode;
VTXD = VCC; VLIN = 0 V; VBAT = 12 V
−600 - - μA
IL(log)
loss of ground leakage
current
VBAT = 18 V; VLIN = 0 V
−750 -
+10 μA
IL(lob)
loss of battery leakage
current
VBAT = 0 V; VLIN = 18 V
- - 2 μA
Vrec(RX)
receiver recessive voltage
VBAT = 5.5 V to 18 V
Vdom(RX)
receiver dominant voltage
VBAT = 5.5 V to 18 V
Vth(cntr)RX
receiver center threshold
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Vth(hys)RX
receiver hysteresis threshold
voltage
CLIN
capacitance on pin LIN
VBAT = 5.5 V to 18 V;
Vth(cntr)RX = (Vth(rec)RX + Vth(dom)RX) / 2
VBAT = 5.5 V to 18 V;
Vth(hys)RX = Vth(rec)RX - Vth(dom)RX
with respect to GND
0.6 ×
VBAT
-
-
-
[2] 0.475 ×
VBAT
[2] 0.05 ×
VBAT
[1] -
0.5 ×
VBAT
0.15 ×
VBAT
-
-
0.4 ×
VBAT
0.525
× VBAT
0.175
× VBAT
30
V
V
V
V
pF
TJA1028
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 25 February 2011
© NXP B.V. 2011. All rights reserved.
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| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet TJA1028.PDF ] | |
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