MCP2003AT-ESLASHP datasheet(4/34 Pages) MICROCHIP

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MCP2003/4/3A/4A

DS20002230F-page 4

 2010-2014 Microchip Technology Inc.

1.3

Modes of Operation

For an overview of all operational modes, refer to

Table 1-1.

1.3.1

POWER-DOWN MODE

In Power-Down mode, everything is off except the

wake-up section. This is the lowest power mode. The

receiver is off, thus its output is open-drain.

On CS going to a high level or a falling edge on WAKE

(MCP2003/MCP2003A only), the device will enter

Ready mode as soon as internal voltage stabilizes.

Refer to Section 2.4 “AC Specifications” for further

information. In addition, LIN bus activity will change

the device from Power-down mode to Ready mode;

MCP2003/4 wakes-up on a falling edge on LBUS,

followed by a low level lasting at least 20 µs.

MCP2003A/4A wakes-up on a rising edge on LBUS,

followed by a high level lasting 70 µs typically. See

Figures 1-2 to 1-5 about remote wake-up. If CS is held

high as the device transitions from Power-Down to

Ready mode, the device will transition to either

Operation or Transmitter Off mode, depending on TXD

input, as soon as internal voltages stabilize.

1.3.2

READY MODE

Upon entering the Ready mode, VREN is enabled and

the receiver detect circuit is powered up. The transmit-

ter remains disabled and the device is ready to receive

data but not to transmit.

Upon VBB supply pin power-on, the device will remain

in Ready mode as long as CS is low. When CS

transitions high, the device will either enter Operation

mode, if TXD pin is held high, or the device will enter

Transmitter Off mode, if TXD pin is held low.

1.3.3

OPERATION MODE

In this mode, all internal modules are operational.

The device will go into Power-Down mode on the falling

edge of CS. For the MCP2003/4 device, a specific

process should be followed to put all nodes into Power-

Down mode. Refer to Section 1.6 “MCP2003/4 and

MCP2003A/4A Difference Details”

and Figure 1-6.

The device will enter Transmitter Off mode in the event

of a Fault condition, such as: thermal overload, bus

contention and TXD timer expiration.

The

MCP2004/2004A

device

can

also

enter

Transmitter Off mode if the FAULT/TXE pin is pulled

low. The VBB to LBUS pull-up resistor is connected only

in Operation mode.

1.3.4

TRANSMITTER OFF MODE

Transmitter Off mode is reached whenever the

transmitter is disabled either due to a Fault condition or

pulling the FAULT/TXE pin low on the MCP2004/2004A.

The Fault conditions include: thermal overload, bus

contention, RXD monitoring or TXD timer expiration.

The device will go into Power-Down mode on the falling

edge of CS, or return to Operation mode if all faults are

resolved

and

the

FAULT/TXE

the

MCP2004/2004A is high.

FIGURE 1-2:

OPERATIONAL MODES STATE DIAGRAM – MCP2003

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& TXD = 0

CS =

1& TXD = 1

CS =

1& TXD = 1& No Fault

Fault (thermal or timer)

CS =

Falling edge on LIN

or CS =

or falling edge on WAKE pin

CS =

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