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PDF TJA1054A Data sheet ( Hoja de datos )
| Número de pieza | TJA1054A | |
| Descripción | Fault-tolerant CAN transceiver | |
| Fabricantes | NXP Semiconductors | |
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TJA1054A
Fault-tolerant CAN transceiver
Rev. 05 — 29 September 2009
www.DataSheet4U.com
Product data sheet
1. General description
The TJA1054A is the interface between the protocol controller and the physical bus wires
in a Controller Area Network (CAN). It is primarily intended for low-speed applications up
to 125 kBd in passenger cars. The device provides differential receive and transmit
capability but will switch to single-wire transmitter and/or receiver in error conditions.
The TJA1054A is the ElectroStatic Discharge (ESD) improved version of the TJA1054.
The TJA1054AT is, as the TJA1054T, pin and downwards compatible with the
PCA82C252T and the TJA1053T. This means that these two devices can be replaced by
the TJA1054AT or the TJA1054T with retention of all functions.
The most important improvements of the TJA1054 and the TJA1054A with respect to the
PCA82C252 and the TJA1053 are:
• Very low ElectroMagnetic Emission (EME) due to a very good matching of the CANL
and CANH output signals
• Good ElectroMagnetic Emission (EMI), especially in low power modes
• Full wake-up capability during bus failures
• Extended bus failure management including short-circuit of the CANH bus line to VCC
• Support for easy system fault diagnosis
• Two-edge sensitive wake-up input signal via pin WAKE
2. Features
2.1 Optimized for in-car low-speed communication
I Baud rate up to 125 kBd
I Up to 32 nodes can be connected
I Supports unshielded bus wires
I Very low ElectroMagnetic Emission (EME) due to built-in slope control function and a
very good matching of the CANL and CANH bus outputs
I Good ElectroMagnetic Immunity (EMI) in normal operating mode and in low power
modes
I Fully integrated receiver filters
I Transmit Data (TxD) dominant time-out function
2.2 Bus failure management
I Supports single-wire transmission modes with ground offset voltages up to 1.5 V
1 page  
NXP Semiconductors
TJA1054A
www.DataSheet4U.com
Fault-tolerant CAN transceiver
7. Functional description
The TJA1054A is the interface between the CAN protocol controller and the physical wires
of the CAN bus (see Figure 7). It is primarily intended for low-speed applications, up to
125 kBd, in passenger cars. The device provides differential transmit capability to the
CAN bus and differential receive capability to the CAN controller.
To reduce EME, the rise and fall slopes are limited. This allows the use of an unshielded
twisted pair or a parallel pair of wires for the bus lines. Moreover, the device supports
transmission capability on either bus line if one of the wires is corrupted. The failure
detection logic automatically selects a suitable transmission mode.
In normal operating mode (no wiring failures) the differential receiver is output on pin RXD
(see Figure 1). The differential receiver inputs are connected to pins CANH and CANL
through integrated filters. The filtered input signals are also used for the single-wire
receivers. The receivers connected to pins CANH and CANL have threshold voltages that
ensure a maximum noise margin in single-wire mode.
A timer function (TxD dominant time-out function) has been integrated to prevent the bus
lines from being driven into a permanent dominant state (thus blocking the entire network
communication) due to a situation in which pin TXD is permanently forced to a LOW level,
caused by a hardware and/or software application failure.
If the duration of the LOW level on pin TXD exceeds a certain time, the transmitter will be
disabled. The timer will be reset by a HIGH level on pin TXD.
7.1 Failure detector
The failure detector is fully active in the normal operating mode. After the detection of a
single bus failure the detector switches to the appropriate mode (see Table 4). The
differential receiver threshold voltage is set at −3.2 V typical (VCC = 5 V). This ensures
correct reception with a noise margin as high as possible in the normal operating mode
and in the event of failures 1, 2, 5 and 6a. These failures, or recovery from them, do not
destroy ongoing transmissions. The output drivers remain active, the termination does not
change and the receiver remains in differential mode (see Table 4).
Failures 3, 3a and 6 are detected by comparators connected to the CANH and CANL bus
lines. Failures 3 and 3a are detected in a two-step approach. If the CANH bus line
exceeds a certain voltage level, the differential comparator signals a continuous dominant
condition. Because of inter operability reasons with the predecessor products
PCA82C252 and TJA1053, after a first time-out the transceiver switches to single-wire
operation through CANH. If the CANH bus line is still exceeding the CANH detection
voltage for a second time-out, the TJA1054A switches to CANL operation; the CANH
driver is switched off and the RTH bias changes to the pull-down current source. The
time-outs (delays) are needed to avoid false triggering by external RF fields.
TJA1054A_5
Product data sheet
Rev. 05 — 29 September 2009
© NXP B.V. 2009. All rights reserved.
5 of 27
5 Page 
NXP Semiconductors
TJA1054A
www.DataSheet4U.com
Fault-tolerant CAN transceiver
10. Static characteristics
Table 8. Static characteristics
VCC = 4.75 V to 5.25 V; VBAT = 5.0 V to 27 V; VSTB = VCC; Tvj = −40 °C to +150 °C; all voltages are defined with respect to
ground; positive currents flow into the device; unless otherwise specified.[1][2][3]
Symbol
Parameter
Conditions
Min Typ Max Unit
Supplies (pins VCC and BAT)
VCC supply voltage
VCC(stb)
supply voltage for
forced standby mode
(fail-safe)
4.75 -
2.75 -
5.25 V
4.5 V
ICC
VBAT
supply current
battery supply voltage
on pin BAT
normal operating mode;
VTXD = VCC (recessive)
normal operating mode;
VTXD = 0 V (dominant); no load
low power modes at VTXD = VCC
no time limit
operating mode
4
10
0
−0.3
5.0
7
17
0
-
-
11 mA
27 mA
10 µA
+40 V
27 V
load dump
- - 40 V
IBAT battery supply current low power mode at
on pin BAT
VRTL = VWAKE = VINH = VBAT
VBAT = 12 V
10 30 50 µA
VBAT = 5 V to 27 V
5 30 125 µA
VBAT = 3.5 V
5 20 30 µA
VBAT = 1 V
0 0 10 µA
sleep mode; VCC = 0 V;
VBAT = 12 V
- 30 50 µA
Vpof(BAT)
power-on flag voltage low power modes
on pin BAT
power-on flag set
- - 1V
power-on flag not set
3.5 - - V
I(tot) total supply current
Pins STB, EN and TXD
low power modes; VCC = 5 V;
VBAT = VWAKE = VINH = 12 V
-
30 60 µA
VIH HIGH-level input
voltage
0.7VCC
-
VCC + 0.3 V
VIL LOW-level input
voltage
−0.3 -
0.3VCC
V
IIH HIGH-level input
current
pins STB and EN VI = 4 V
pin TXD
VI = 4 V
IIL LOW-level input
current
- 9 20 µA
−200
−80
−25
µA
pins STB and EN
pin TXD
VI = 1 V
VI = 1 V
4
−800
8
−320
-
−100
µA
µA
TJA1054A_5
Product data sheet
Rev. 05 — 29 September 2009
© NXP B.V. 2009. All rights reserved.
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