MCP2561FD-ESLASHMF datasheet(5/32 Pages) MICROCHIP

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 2014 Microchip Technology Inc.

DS20005284A-page 5

MCP2561/2FD

1.7.1

TRANSMITTER DATA



INPUT PIN (TXD)

The CAN transceiver drives the differential output pins

CANH and CANL according to TXD. 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 TXD 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. TXD is connected to an internal pull-up

resistor (nominal 33 k

) to 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 (RXD)

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. RXD 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 (TXD, RXD and STBY) is

internally connected to VDD.

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.

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