MCP25612FD datasheet(14/26 Pages) MICROCHIP

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MCP25612FD

DS20005409A-page 14

 2015 Microchip Technology Inc.

3.0

PIN DESCRIPTIONS

Table 3-1 describes the MCP25612FD device pinout.

3.1

Transmitter Data Input Pin (TXDX)

The CAN transceivers drive the differential output pins,

CANHx and CANLx, according to TXDX. TXDX is usually

connected to the transmitter data output of the CAN

controller device. When TXDX is low, CANHx and

CANLx are in the Dominant state. When TXDX is high,

CANHx and CANLx are in the Recessive state,

provided that another CAN node is not driving the CAN

bus with a Dominant state. TXDX is connected to an

internal pull-up resistor (nominal 33 kΩ) to VDDX.

3.2

Ground Supply Pin (VSSX)

Ground supply pin.

3.3

Supply Voltage Pin (VDDX)

Positive supply voltage pin. Supplies the transmitter

and receiver, including the wake-up receiver.

3.4

Receiver Data Output Pin (RXDX)

RXDX is a CMOS-compatible output that drives high or

low, depending on the differential signals on the

CANHx and CANLx pins, and is usually connected to

the receiver data input of the CAN controller device.

RXDX is high when the CAN bus is in the Recessive

state and low in the Dominant state. RXDX is supplied

by VDDX.

3.5

CAN Low Pin (CANLx)

The CANLx output drives the low side of the CAN

differential bus. This pin is also tied internally to the

receive input comparator. CANLx disconnects from the

bus when MCP25612FD is not powered.

3.6

CAN High Pin (CANHx)

The CANHx output drives the high side of the CAN

differential bus. This pin is also tied internally to the

receive input comparator. CANHx disconnects from the

bus when MCP25612FD is not powered.

3.7

Standby Mode Input Pin (STBYx)

This pin selects between Normal or Standby mode. In

Standby mode, the transmitter and high-speed receiver

are turned off; only the low-power receiver and

wake-up filter are active. STBYx is connected to an

internal MOS pull-up resistor to VDDX. The typical value

is 660 kΩ.

TABLE 3-1:

MCP25612FD PIN FUNCTIONS

SOIC

Pin Name

Pin Type

Pin Function

1TXD1

Transmit Data Input

2VSS1

Power

Ground

3VDD1

Power

Transceiver Supply Voltage

4RXD1

Receive Data Output

5TXD2

Transmit Data Input

6VSS2

Power

Ground

7VDD2

Power

Transceiver Supply Voltage

8RXD2

Receive Data Output

CANL2

I/O

CAN Low-Level Bus Line

CANH2

I/O

CAN High-Level Bus Line

STBY2

Standby Mode Input (active-high)

CANL1

I/O

CAN Low-Level Bus Line

CANH1

I/O

CAN High-Level Bus Line

STBY1

Standby Mode Input (active-high)

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