NXP Semiconductors
TJA1042
High-speed CAN transceiver with Standby mode
V
CC
TJA1042T
CANH
R
60
Ω
V
SPLIT
= 0.5 V
CC
in normal mode;
otherwise floating
R
SPLIT
60
Ω
CANL
GND
015aaa020
Fig 3.
Stabilization circuitry and application for version with SPLIT pin
6.3.2 V
IO
supply pin
Pin V
IO
on the TTJA1042T/3 and TJA1042TK/3 should be connected to the
microcontroller supply voltage (see
This will adjust the signal levels of pins TXD,
RXD and STB to the I/O levels of the microcontroller. Pin V
IO
also provides the internal
supply voltage for the low-power differential receiver of the transceiver. For applications
running in low-power mode, this allows the bus lines to be monitored for activity even if
there is no supply voltage on pin V
CC
.
For versions of the TJA1042 without a V
IO
pin, the V
IO
input is internally connected to V
CC
.
This sets the signal levels of pins TXD, RXD and STB to levels compatible with 5 V
microcontrollers.
7. Application design-in information
BAT
5V
V
CC
CANH
CANH
STB
Pxx
Pyy
V
DD
SPLIT
TJA1042T
TXD
RXD
TX0
RX0
MICRO-
CONTROLLER
GND
015aaa022
CANL
CANL
GND
Fig 4.
Typical application with TJA1042T and a 5 V microcontroller.
TJA1042_2
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 — 8 July 2009
7 of 20
PHILIPS [ NXP SEMICONDUCTORS ]
