MCP2021 datasheet(5/46 Pages) MICROCHIP

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DS22018E-page 5

MCP2021/2

TABLE 1-1:

OVERVIEW OF OPERATIONAL MODES

1.4

Typical Applications

EXAMPLE 1-1:

TYPICAL MCP2021 APPLICATION

State

Transmitter

Receiver

Voltage

Regulator

Operation

Comments

POR

OFF

Read CS/LWAKE, if LOW, then READY,

if HIGH, Operational mode

READY

OFF

Activity

Detect

If CS/LWAKE high level, then Operation

mode

Bus Off state

OPERATION

If CS/LWAKE 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/LWAKE high level, go to

Operational mode

Low Power

mode

TRANSMITTER-

OFF

If CS/LWAKE low level, then Power down

If FAULT/TXE high, then Operation mode

LIN Bus

27V

(4)

VBB

LBUS

VREG

TXD

RXD

VSS

VDD

TXD

RXD

+12

CS/LWAKE

I/O

FAULT/TXE

I/O

43V

(5)

+12

Master Node Only

+12

220 k

WAKE-UP

Note 1: See Figure 2-3 for correct capacity and ESR for stable operation.

2: CF is the filter capacitor for the external voltage supply.

3: This diode is only needed if CS/LWAKE is connected to 12V supply.

4: Transient suppressor diode. Vclamp L = 43V.

5: These components are required for additional load dump protection above 43V..

(3)

RTP

(5)

100nF

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