Datasheet

 2014 Microchip Technology Inc. DS20005284A-page 5
MCP2561/2FD
1.7.1 TRANSMITTER DATA 
INPUT PIN (T
XD)
The CAN transceiver drives the differential output pins
CANH and CANL according to T
XD. It is usually
connected to the transmitter data output of the CAN
controller device. When TXD is Low, CANH and CANL
are in the Dominant state. When T
XD is High, CANH
and CANL are in the Recessive state, provided that
another CAN node is not driving the CAN bus with a
Dominant state. T
XD is connected to an internal pull-up
resistor (nominal 33 k) t
o VDD or VIO, in the
MCP2561FD or MCP2562FD, respectively.
1.7.2 GROUND SUPPLY PIN (VSS)
Ground supply pin.
1.7.3 SUPPLY VOLTAGE PIN (VDD)
Positive supply voltage pin. Supplies transmitter and
receiver, including the wake-up receiver.
1.7.4 RECEIVER DATA 
OUTPUT PIN (R
XD)
RXD is a CMOS-compatible output that drives High or
Low depending on the differential signals on the CANH
and CANL pins, and is usually connected to the
receiver data input of the CAN controller device. R
XD is
High when the CAN bus is Recessive, and Low in the
Dominant state. RXD is supplied by VDD or VIO, in the
MCP2561FD or MCP2562FD, respectively.
1.7.5 SPLIT PIN (MCP2561FD ONLY)
Reference Voltage Output (defined as VDD/2). The pin
is only active in Normal mode. In Standby mode, or
when VDD is off, SPLIT floats.
1.7.6 VIO PIN (MCP2562FD ONLY)
Supply for digital I/O pins. In the MCP2561FD, the
supply for the digital I/O (T
XD, RXD and STBY) is
internally connected to V
DD.
1.7.7 CAN LOW PIN (CANL)
The CANL output drives the Low side of the CAN
differential bus. This pin is also tied internally to the
receive input comparator. CANL disconnects from the
bus when MCP2561/2FD is not powered.
1.7.8 CAN HIGH PIN (CANH)
The CANH output drives the high-side of the CAN
differential bus. This pin is also tied internally to the
receive input comparator. CANH disconnects from the
bus when MCP2561/2FD is not powered.
1.7.9 STANDBY MODE INPUT PIN (STBY)
This pin selects between Normal or Standby mode. In
Standby mode, the transmitter, high speed receiver and
SPLIT are turned off, only the low power receiver and
wake-up filter are active. STBY is connected to an
internal MOS pull-up resistor to VDD or VIO, in the
MCP2561FD or MCP2562FD, respectively. The value
of the MOS pull-up resistor depends on the supply volt-
age. Typical values are 660 k for 5V
, 1.1 M for 3.3V
and 4.4 M for 1
.8V
1.7.10 EXPOSED THERMAL PAD (EP)
It is recommended that this pad is connected to VSS for
the enhancement of electromagnetic immunity and
thermal resistance.