MCP2025-500ESLASHP datasheet(3/38 Pages) MICROCHIP

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 2012-2014 Microchip Technology Inc.

DS20002306B-page 3

MCP2025

1.0

DEVICE OVERVIEW

The MCP2025 provides a physical interface between a

microcontroller and a LIN half-duplex bus. It is intended

for automotive and industrial applications with serial

bus baud rates up to 20 kBaud. This device will

translate the CMOS/TTL logic levels to LIN logic levels,

and vice versa.

The device offers optimum EMI and ESD performance

and it can withstand high voltage on the LIN bus. The

device supports two low-power modes to meet

automotive industry power consumption requirements.

The MCP2025 also provides a +5V or 3.3V regulated

power output at 70 mA.

1.1

Modes of Operation

The MCP2025 works in five modes: Power-On Reset,

Power-Down, Ready, Operation and Transmitter Off.

For an overview of all operational modes, please refer

to Table 1-1. For the operational mode transition,

please refer to Figure 1-1.

FIGURE 1-1:

STATE DIAGRAM

Note 1:

VREG_OK: Regulator Output Voltage > 0.8VREG_NOM.

If the voltage on pin VBB falls below VOFF, the device will enter Power-On Reset mode from all other

modes, which is not shown in the figure.

Faults include TXD/LBUS permanent dominant, LBUS short to VBB, thermal protection and VREG_OK is

false.

POR

(2)

VREG OFF

RX OFF

TX OFF

READY

VREG ON

RX ON

TX OFF

VREG ON

RX ON

TX OFF

POWER-DOWN

VREG OFF

RX OFF

TX OFF

OPERATION

VREG ON

RX ON

TX ON

VBB >VON

CS =

1 &TXD = 0&

CS/LWAKE =

&TXD = 0

CS/LWAKE =

1 &TXD = 1

VREG_OK =

1(1)

CS/LWAKE =

TXD =

No Fault

(3)

CS/LWAKE =

0 or

Fault detected

(3)

CS/LWAKE =

1 OR

Voltage Rising Edge on LBUS

CS/LWAKE =

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