MCP2003 datasheet(5/32 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS22230A-page 5

MCP2003/4

FIGURE 1-3:

OPERATIONAL MODES STATE DIAGRAM – MCP2004

TABLE 1-1:

OVERVIEW OF OPERATIONAL MODES

Note:

While the MCP2003/4 is in thermal shutdown, TXD should not be actively driven high or it may power

internal logic through the ESD diodes and may damage the device.

State

Transmitter Receiver

Vren

Operation

Comments

POR

OFF

Read CS, if low, then Ready;

if high, Operational mode

Ready

OFF

If CS high level, then Operation 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 LIN bus falling, go to Ready mode. On CS

high level, go to Operation 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

Operation

Mode

VREN ON

RX ON

TX ON

Ready

Mode

VREN ON

RX ON

TX OFF

TOFF

Mode

VREN ON

RX ON

TX OFF

Sleep Mode

VREN OFF

RX OFF

TX OFF

VBB > 5 .5V

CS = 0

Falling edge on LIN

CS = 1

POR

VREN OFF

RX OFF

TX OFF

CS = 1and TXE = 1

and TXD = 1

and No Fault

Fault

(Thermal or Timer)

or TXE=0

CS = 1 and (TXE = 0 or TXD = 0)

CS = 1 and

TXD = 1 and

TXE = 1

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