CAN
TJA1052i
Galvanically isolated high-speed CAN transceiver
Rev. 5 — 29 January 2018
Product data sheet
1. General description
The TJA1052i is a high-speed CAN transceiver that provides a galvanically isolated
interface between a Controller Area Network (CAN) protocol controller and the physical
two-wire CAN bus. The TJA1052i is specifically targeted at Electric Vehicles (EV) and
Hybrid Electric Vehicles (HEV), where galvanic isolation barriers are needed between the
high- and low-voltage parts.
Safety:
Isolation is required for safety reasons, eg. to protect humans from electric shock
or to prevent the electronics being damaged by high voltages.
Signal integrity:
The isolator uses proprietary capacitive isolation technology to transmit
and receive CAN signals. This technology enables more reliable data communications in
noisy environments, such as high-voltage battery management systems or the drive and
regeneration systems in EVs and HEVs.
Performance:
The transceiver is designed for high-speed CAN applications in the
automotive industry, supplying the differential transmit and receive capability to a CAN
protocol controller in a microcontroller. Integrating the galvanic isolation along with the
transceiver in the TJA1052i removes the need for stand-alone isolation. It also improves
reliability and system performance parameters such as loop delay.
The TJA1052i belongs to the third generation of high-speed CAN transceivers from NXP
Semiconductors, offering significant improvements over first- and second-generation
devices. It offers improved ElectroMagnetic Compatibility (EMC) and ElectroStatic
Discharge (ESD) performance, and also features ideal passive behavior to the CAN bus
when the transceiver supply voltage is off.
The TJA1052i implements the CAN physical layer as defined in ISO 11898-2:2016 and
SAE J2284-1 to SAE J2284-5. This implementation enables reliable communication in the
CAN FD fast phase at data rates up to 5 Mbit/s.
The TJA1052i is an excellent choice for all types of automotive and industrial CAN
networks where isolation is required for safety reasons or to enhance signal integrity in
noisy environments.
2. Features and benefits
2.1 General
Isolator and Transceiver integrated into a single SO16 package, reducing board space
ISO 11898-2:2016 and SAE J2284-1 to SAE J2284-5 compliant
Timing guaranteed for data rates up to 5 Mbit/s in the CAN FD fast phase
Flawless cooperation between the Isolator and the Transceiver
NXP Semiconductors
TJA1052i
Galvanically isolated high-speed CAN transceiver
Fewer components improves reliability in applications
Guaranteed performance (eg. max loop delay <220 ns)
Electrical transient immunity of 45 kV/s (typ)
AEC-Q100 qualified
Suitable for use in 12 V and 24 V systems; compatible with 3 V to 5 V microcontrollers
Bus common mode voltage (V
cm
) =
25
V
Low ElectroMagnetic Emission (EME) and high ElectroMagnetic Immunity (EMI)
Dark green product (halogen free and Restriction of Hazardous Substances (RoHS)
compliant)
2.2 Power management
Functional behavior predictable under all supply conditions
Transceiver disengages from the bus when not powered up (zero load)
2.3 Protection
Up to 5 kV (RMS) rated isolation
Three versions available (1 kV, 2.5 kV and 5 kV)
Voltage compliant with UL 1577, IEC 61010 and IEC 60950
5 kV (RMS) rated isolation voltage compliant with UL 1577, IEC 61010 and IEC 60950
Supports ISO6469 ‘Electrically propelled road vehicles. Safety specifications.’
High ESD handling capability on the bus pins
Bus pins protected against transients in automotive environments
Transmit Data (TXD) dominant time-out function
Undervoltage detection on supply pins
3. Quick reference data
Table 1.
Symbol
I
DD1
I
DD2
V
uvd(swoff)(VDD2)
V
ESD
V
CANH
V
CANL
T
vj
T
amb
Quick reference data
Parameter
supply current 1
supply current 2
switch-off undervoltage
detection voltage on pin V
DD2
electrostatic discharge voltage
voltage on pin CANH
voltage on pin CANL
virtual junction temperature
ambient temperature
IEC 61000-4-2 at pins CANH and CANL
Conditions
V
TXD
= 0 V; bus dominant
V
TXD
= V
DD1
; bus recessive
V
TXD
= 0 V; bus dominant; 60
load
V
TXD
= V
DD1
; bus recessive
Min
-
-
-
-
1.3
8
58
58
40
40
Typ
-
-
-
-
-
-
-
-
-
-
Max
2.6
5.6
70
10
2.7
+8
+58
+58
+150
+125
Unit
mA
mA
mA
mA
V
kV
V
V
C
C
TJA1052I
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 5 — 29 January 2018
2 of 27
NXP Semiconductors
TJA1052i
Galvanically isolated high-speed CAN transceiver
4. Ordering information
Table 2.
Ordering information
Package
Name
TJA1052IT/5
TJA1052IT/2
TJA1052IT/1
SO16
Description
plastic small outline package; 16 leads; body width 7.5 mm
Version
SOT162-1
Type number
Table 3.
Voltage ratings
Rated insulation voltage according to
UL 1577, IEC 61010 and IEC 60950
5 kV (RMS)
2.5 kV (RMS)
1 kV (RMS)
Type number
TJA1052IT/5
TJA1052IT/2
TJA1052IT/1
5. Block diagram
Fig 1.
Block diagram
TJA1052I
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© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 5 — 29 January 2018
3 of 27
NXP Semiconductors
TJA1052i
Galvanically isolated high-speed CAN transceiver
6. Pinning information
6.1 Pinning
Fig 2.
Pin configuration diagram
6.2 Pin description
Table 4.
Symbol
V
DD1
GND1
TXD
n/c
RXD
n/c
GND1
GND1
GND2
GND2
V
DD2
CANL
CANH
STB
GND2
V
DD2
[1]
Pin description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Description
supply voltage 1
ground supply 1
[1]
transmit data input
not connected
receive data output; reads out data from the bus lines
not connected
ground supply 1
[1]
ground supply 1
[1]
ground supply 2
[1]
ground supply 2
[1]
supply voltage 2
LOW-level CAN bus line
HIGH-level CAN bus line
Standby mode control input
[2]
ground supply 2
[1]
supply voltage 2
All GND1 pins (pins 2, 7 and 8) should be connected together and to ground domain 1. All GND2 pins (pins
9, 10 and 15) should be connected together and to ground domain 2. Refer to the application notes for
further information.
Setting STB HIGH disables the CAN bus connection.
[2]
TJA1052I
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 5 — 29 January 2018
4 of 27
NXP Semiconductors
TJA1052i
Galvanically isolated high-speed CAN transceiver
7. Functional description
7.1 Operation
7.1.1 Normal mode
During normal operation, the TJA1052i transceiver transmits and receives data via bus
lines CANH and CANL (see
Figure 1
for the block diagram). The differential receiver
converts the analog data on the bus lines into digital data, which is output on pin RXD.
The slopes of the output signals on the bus lines are controlled internally and are
optimized in a way that guarantees the lowest possible EME.
The isolator used in the TJA1052i is an AC device that employs on-off keying to
guarantee the DC output state at all times. The states of TXD, RXD and the CAN bus at
start-up, shut-down and during normal operation are described in
Table 5.
Care should be taken regarding power sequencing if the device is used in networks that
support remote wake-up (see
Section 12 “Application information”).
Table 5.
TXD
H
L
X
H
L
X
Input/output states at start-up, shut-down and during normal operation
RXD
V
DD1
>V
uvd(VDD1)
>V
uvd(VDD1)
unpowered
V
DD2
>V
uvd(stb)VDD2)
>V
uvd(stb)VDD2)
>V
uvd(stb)VDD2)
CAN
recessive
dominant
dominant
Comments
Normal mode operation
Normal mode with TXD dominant time-out active
dominant after V
DD1
power loss until TXD dominant
timeout; recessive while V
DD2
is ramping up from
an unpowered state
RXD transitions L-to-H when V
DD2
restored
X
L
>V
uvd(VDD1)
unpowered
disconnected
7.1.2 Standby mode
The TJA1052i cannot transmit or receive regular CAN messages in Standby mode. Only
the isolator and low-power CAN receiver are active, monitoring the bus lines for activity.
The bus wake-up filter ensures that only bus dominant and bus recessive states that
persist longer than t
fltr(wake)bus
are reflected on the RXD pin (see
Figure 3).
To reduce
current consumption, the CAN bus is terminated to GND and not biased to V
DD2
/2 as in
Normal mode.
Standby mode is selected by setting pin STB HIGH. The TJA1052i also switches to
Standby mode when an undervoltage is detected on V
DD2
(V
uvd(swoff)(VDD2)
< V
DD2
<
V
uvd(stb)(VDD2)
;
Section 7.2.3).
An internal pull-up ensures that Standby mode is selected
by default when pin STB is not connected.
In Standby mode:
•
•
•
•
•
•
TJA1052I
The CAN transmitter if off
The normal CAN receiver is off
The low-power CAN receiver is active
CANH and CANL are biased to GND
The signal received at the low-power CAN receiver is reflected on pin RXD
V
DD2
undervoltage detection is active
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 5 — 29 January 2018
5 of 27
