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Introduction
1.2
FUNCTIONAL OVERVIEW
The block diagram shown in Figure 1-3 illustrates the mainstream operation of the
CAN/LIN/J2602 PICtail? (Plus) Daughter Board. The board contains two LIN signal
conditioning circuits and two CAN signal conditioning circuits. The board also enables
power to be provided by the development board it is connected to, or by an external
12V DC source.
FIGURE 1-3:
CAN/LIN/J2602 PICtail ? (Plus) DAUGHTER BOARD BLOCK DIAGRAM
CAN/LIN/J2602 PICtail ? (Plus) DAUGHTER BOARD
Receive
DEVELOPMENT BOARD
LIN1
Bus
LIN2
Bus
LIN1
Transceiver
(U1)
LIN2
Transceiver
(U2)
Transmit Enable
Transmit
Interrupt/Wake
Receive
Transmit Enable
Transmit
Interrupt/Wake
To UART Module on
dsPIC33F, PIC24 or PIC18
CAN1
Bus
High
Low
CAN1
Transceiver
(U3)
Receive
Transmit
To ECAN Module on
CAN2
Bus
High
Low
CAN2
Transceiver
(U4)
Receive
Transmit
dsPIC33F, PIC24 or PIC18
1.2.1
LIN Operation
The CAN/LIN/J2602 PICtail? (Plus) Daughter Board connects two LIN transceivers
with integrated voltage regulators to UART modules on a dsPIC33F, PIC24 or PIC18
control device on the Explorer 16 or PIC18 Explorer Board. The LIN transceiver moni-
tors the LIN bus, conditions the incoming signal and passes it to the UART module on
the control device. The LIN transceiver responds to a “Transmit Enable” from the con-
trol device by conditioning an output signal and placing it on the LIN bus.
A Power-down mode turns the transmitter and voltage regulator off, leaving only the
receiver and wake-up circuits in operation. Each LIN circuit includes a Master/Slave
jumper to accommodate a Master node on the LIN bus.
In order to use the transmit enable for the LIN2 transceiver with the PIC18 Explorer
Board and a PIC18 device, the LIN2TXE pin must be connected to 5V, or a pin on the
PIC18 device, to control it. This can be done by connecting a jumper wire on the J18
header between LIN2TXE and either the 5V supply also on the J18 header, or an avail-
able pin on either the J17 or J18 header. For more information on the J17 and J18
? 2011 Microchip Technology Inc.
DS70319B-page 13
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