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TJA1050T/V,518 开发手册 - NXP（恩智浦）
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TJA1050T/V,518数据手册
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AN00094_3 © NXP B.V. 2006. All rights reserved.
Application note Rev. 03 — 8 November 2006 4 of 50
NXP Semiconductors
AN00094
TJA1041/1041A high speed CAN transceiver
The block diagram in Figure 2 describes the basic structure of an ECU. Typically an ECU
(CAN-node) consists of a standalone transceiver and a host microcontroller with
integrated CAN-controller, which are supplied by a voltage regulator. While the high speed
CAN transceiver needs a +5 V supply, new microcontroller products are increasingly using
lower supply voltages. In this case a dedicated voltage regulator is necessary for the
microcontroller. The protocol controller is connected to the transceiver via a serial data
output line (TXD) and a serial data input line (RXD). The transceiver is attached to the bus
lines via its two bus terminals CANH and CANL, which provide differential receive and
transmit capability. In the case of the TJA1041 there is an additional INH signal line
(indicated in Figure 2
) controlling the voltage regulator. Leaving control over the voltage
regulator(s) for V
CC
and μC supply voltage to the TJA1041(A) allows for an extremely low
ECU quiescent current.
The CAN controller outputs a serial transmit data stream to the TXD input of the
transceiver. An internal pull-up function within the TJA1041 sets the TXD input to logic
HIGH i.e. the bus output driver is passive in open circuit condition. In the recessive state
the CANH and CANL pins are biased to a voltage level of V
CC
/2. If a logic LOW-level is
applied to TXD, this activates the bus output stage, generating a dominant state on the
Fig 2. Application of high speed CAN
ECU ECU ECU ECU
μC
+
CAN
CAN-
Xeiver
Voltage
Regulator
TxD
RxD
Vcc Vcc
BAT
GND
Sensor
Actuator
R
T
/2
R
T
/2
C
spl
R
T
/2
R
T
/2
C
spl
INH
CANH
CANL
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