MCP2003-ESLASHSN datasheet(6/34 Pages) MICROCHIP

6 / 34 page

MCP2003/4/3A/4A

DS20002230F-page 6

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FIGURE 1-5:

OPERATIONAL MODES STATE DIAGRAM – MCP2004A

TABLE 1-1:

OVERVIEW OF OPERATIONAL MODES

State

Transmitter Receiver

VREN

Operation

Comments

POR

OFF

Check CS, if low then proceed to Ready

mode;

If high, transitions to either TOFF or Operation

mode, depending on TXD (2003/A), or TXD

and FAULT/TXE (2004/A).

VBB > VBB(MIN)

and Internal

Supply stable

Ready

OFF

If CS is high level, then proceed to Operation

or TXOFF mode.

Bus Off state

Operation

If CS is low level, then proceed to Power-

Down;

If FAULT/TXE low level, then proceed to

Transmitter Off mode.

Normal Operation

mode

Power-Down

OFF

Activity

Detect

OFF

On CS high level, proceed to Ready mode

then proceed to either Operation mode or

TXOFF.

MCP2003/2003A: Falling edge on WAKE will

put the device into Ready mode.

MCP2003/MCP2004: falling edge on LIN bus

will put the device into Ready mode.

MCP2003A/MCP2004A: rising edge on LIN

bus will put the device into Ready mode.

Low-Power mode

Transmitter Off

OFF

If CS is low level, then proceed to Power-

Down mode;

If FAULT/TXE and TXD high, then proceed to

Operation mode

FAULT/TXE only

available on

MCP2004/2004A

POR

VREN OFF

RX OFF

TX OFF

VBAT > 5.5V

Ready

VREN ON

RX ON

TX OFF

TOFF

Mode

VREN ON

RX ON

TX OFF

Operation

Mode

VREN ON

RX ON

TX ON

POWER

DOWN

VREN OFF

RX OFF

TX OFF

CS =

1& (TXE = 0 or TXD = 0)

CS =

1& TXD = 1 & TXE = 1

CS =

1& TXD = 1&

TXE =

1& No Fault

Fault (thermal or timeout) or

FAULT/TXE =

CS =

Rising edge on LIN

or CS =

CS =

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