MCP2561FD datasheet(4/32 Pages) MICROCHIP

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MCP2561/2FD

DS20005284A-page 4

 2014 Microchip Technology Inc.

1.5

Permanent Dominant Detection

The MCP2561/2FD device prevents two conditions:

• Permanent Dominant condition on TXD

• Permanent Dominant condition on the bus

In Normal mode, if the MCP2561/2FD detects an

extended Low state on the TXD input, it will disable the

CANH and CANL output drivers in order to prevent the

corruption of data on the CAN bus. The drivers will

remain disabled until TXD goes High.

In Standby mode, if the MCP2561/2FD detects an

extended Dominant condition on the bus, it will set the

RXD pin to Recessive state. This allows the attached

controller to go to Low-Power mode until the Dominant

issue is corrected. RXD is latched High until a

Recessive state is detected on the bus, and the

wake-up function is enabled again.

Both conditions have a time-out of 1.25 ms (typical).

This implies a maximum bit time of 69.44 µs

(14.4 kHz), allowing up to 18 consecutive dominant bits

on the bus.

1.6

Power-On Reset (POR) and



Undervoltage Detection

The MCP2561/2FD has undervoltage detection on

both supply pins: VDD and VIO. Typical undervoltage

thresholds are 1.2V for VIO and 4V for VDD.

When the device is powered on, CANH and CANL

remain in a high-impedance state until both VDD and

VIO exceed their undervoltage levels. Once powered

on, CANH and CANL will enter a high-impedance state

if the voltage level at VDD drops below the undervoltage

level, providing voltage brown-out protection during

normal operation.

In Normal mode, the receiver output is forced to

Recessive state during an undervoltage condition on

VDD. In Standby mode, the low-power receiver is only

enabled when both VDD and VIO supply voltages rise

above their respective undervoltage thresholds. Once

these threshold voltages are reached, the low-power

receiver is no longer controlled by the POR comparator

and remains operational down to about 2.5V on the

VDD supply (MCP2561/2FD). The MCP2562FD

transfers data to the RXD pin down to 1.8V on the VIO

supply.

1.7

Pin Descriptions

Table 1-2 describes the pinout.

TABLE 1-2:

MCP2561/2FD PIN DESCRIPTIONS

MCP2561FD

3x3 DFN

MCP2561FD

PDIP, SOIC

MCP2562FD

3x3 DFN

MCP2562FD

PDIP, SOIC

Symbol

Pin Function

TXD

Transmit Data Input

VSS

Ground

VDD

Supply Voltage

RXD

Receive Data Output

—

SPLIT

Common Mode Stabilization - MCP2561FD only

—

VIO

Digital I/O Supply Pin - MCP2562FD only

CANL

CAN Low-Level Voltage I/O

CANH CAN High-Level Voltage I/O

STBY

Standby Mode Input

—

Exposed Thermal Pad

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