MCP25612FD datasheet(3/26 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS20005409A-page 3

MCP25612FD

1.0

DEVICE OVERVIEW

The MCP25612FD is a dual fully independent, CAN

FD transceiver Fault tolerant device that serves as the

interface between a CAN protocol controller and the

physical bus. The MCP25612FD device provides differ-

ential transmit and receive capability for the CAN pro-

tocol controller, and is fully compatible with the ISO

11898-2 and ISO 11898-5 standards.

The Loop Delay Symmetry is ensured to support data

rates up to 8 Mbps for CAN FD (Flexible Data-Rate).

The maximum propagation delay was improved to

support longer bus length.

Typically, each node in a CAN system must have a

device to convert the digital signals generated by a

CAN controller to signals suitable for transmission over

the bus cabling (differential output). It also provides a

buffer between the CAN controller and the high-voltage

spikes that can be generated on the CAN bus by

outside sources.

1.1

Mode Control Block

The MCP25612FD supports two modes of operation

between the two CAN transceivers independently:

• Normal Mode

• Standby Mode

These modes are summarized in Table 1-1.

1.1.1

NORMAL MODE

Normal mode is selected by applying low-level voltage

to the STBYx pin. The driver block is operational and

can drive the bus pins. The slopes of the output signals

on CANHx and CANLx are optimized to produce

minimal Electromagnetic Emissions (EME).

The high-speed differential receiver is active.

1.1.2

STANDBY MODE

The device may be placed in Standby mode by apply-

ing a high-level voltage to the STBYx pin. In Standby

mode, the transmitter and the high-speed part of the

receiver are switched off to minimize power consump-

tion. The low-power receiver and the wake-up filter

blocks are enabled to monitor the bus for activity. The

Receive pin (RXDX) will show a delayed representation

of the CAN bus due to the wake-up filter.

The CAN controller gets interrupted by a negative edge

on the RXDX pin (Dominant state on the CAN bus). The

CAN controller must put the MCP25612FD back into

Normal mode, using the STBYx pin, in order to enable

high-speed data communication.

The CAN bus wake-up function requires VDDX to be in

valid range.

TABLE 1-1:

MODES OF OPERATION

Mode

STBYx Pin

RXDX Pin

Low

High

Normal

Low

Bus is dominant

Bus is recessive

Standby

High

Wake-up request is detected

No wake-up request detected

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