MCP2003 datasheet(6/34 Pages) MICROCHIP

6 / 34 page

MCP2003/4/3A/4A

DS22230D-page 6

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 Ready;

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 high level, then either Operation or

TXOFF mode.

Bus Off state

Operation

If CS low level, then Power-Down;

If FAULT/TXE low level, then Transmitter Off

mode.

Normal Operation

mode

Power-Down

OFF

Activity

Detect

OFF

On CS high level, go to READY then 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 low level, then Power-Down;

If FAULT/TXE and TXD high, then 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=0

CS=0

Rising edge on LIN

or CS=1

CS=0

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