Hardware
2011 Microchip Technology Inc.
DS70319B-page 17
2.2.1
Explorer 16 Board PICtail™ Connector (J7)
Explorer 16 Board PICtail connector J7 (see Reference 1), a 120-pin signal connector
that carries signals from the I/O pins of the dsPIC33F or PIC24 device on the Explorer
16 Board to the CAN/LIN/J2602 PICtail (Plus) Daughter Board. This connector handles
the following signals:
• 9V, 5V and 3.3V DC input to the CAN/LIN/J2602 PICtail (Plus) Daughter Board
• Signals from the ECAN modules on the dsPIC33F or PIC24 device to the CAN
transceivers on the CAN/LIN/J2602 PICtail (Plus) Daughter Board
• Signals from the UART modules on the dsPIC33F or PIC24 device to the LIN
transceivers on the CAN/LIN/J2602 PICtail (Plus) Daughter Board
• LIN Bus Fault Communication
2.2.2
Auxiliary Headers (J17, J18)
Auxiliary Headers J17 and J18 (see Reference 2) make a various set of signals avail-
able from the development board. These headers can be used for monitoring, testing
and development purposes. Refer to
Section 2.3 “Auxiliary Header Pinouts”
as well
as the board schematic for more details on these headers.
2.2.3
LIN Bus Master/Slave Select Jumpers (JP12, JP13)
The LIN1 and LIN2 Bus Master/Slave Select Jumpers (see Reference 3 or
Reference 7) are used to indicate the presence of a master device on the LIN bus.
Placing jumper JP13 or JP12 pulls the LIN bus high via a 1K pull-up resistor. This can
be detected by nodes on the LIN bus as an indication that a Master node is present.
There can be only one Master node on a LIN bus.
2.2.4
LIN Transceivers (U1, U2)
A set of MCP2021 LIN transceivers (see Reference 8 and Reference 4) provide the
interface between the UART modules on the dsPIC33F, PIC24 or PIC18 device and the
LIN bus. The transceiver converts the signals from the UART modules on the control
device to a 5V regulated signal for the LIN bus. The power supply to the LIN transceiv-
ers is selectable b12V or +9V with jumper J2 (see Reference 6). While the
+9V is available from the development board, the +12V supply must be connected
externally to J1 (see Reference 10). For PIC18 devices, the LIN 1 and LIN 2 modules
can be used on two sets of pins chosen by the J4, J8, J13 and J14 jumpers. Choose
the correct pinout corresponding to which PIC18 device is used.
2.2.5
LIN Bus Connectors (J10, J12)
The LIN1 and LIN2 bus connectors are 3-pin terminal blocks that connect the
CAN/LIN/J2602 PICtail (Plus) Daughter Board to a LIN bus. LIN1 connector J10 (see
Reference 9) connects UART1 module on the dsPIC33F, PIC24 or PIC18 control
device to the LIN bus via the LIN1 transceiver. LIN2 connector J12 (see Reference 5)
connects UART 2 module on the dsPIC33F, PIC24 or PIC18 control device to the LIN
bus via the LIN2 transceiver.
2.2.6
LIN Transceiver Power Supply Select Jumper (J2)
This 3-pin jumper (see Reference 6) selects the power supply to LIN transceivers U1
and U2. 9V DC is supplied from the development board or +12V DC is supplied
from an external power supply connected to J1 (see Reference 10).
2.2.7
Ex12V DC LIN Power Supply Terminal Block (J9)
Ex12V DC power for the LIN transceivers must be connected to J1 (see
Reference 10).
