MCP2050 datasheet(3/40 Pages) MICROCHIP

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 2012-2014 Microchip Technology Inc.

DS20002299C-page 3

MCP2050

1.0

FUNCTION DESCRIPTION

The MCP2050 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; it can withstand high voltage on the

LIN bus. The device supports two low-power modes to

meet

automotive

industry

power

consumption

requirements. The MCP2050 also provides a +5V or

3.3V 70 mA regulated power output.

1.1

Modes of Operation

The MCP2050 works in five modes: Power-On Reset

mode, Power-Down mode, Ready mode, Operation

mode, and Transmitter Off mode. 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

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/LWAKE =

FAULT/TXE =

CS/LWAKE =

FAULT/TXE =

1(3) &

TXD =

VREG_OK =

1(1)

CS/LWAKE =

FAULT/TXE =

1(3)&

TXD =

CS/LWAKE =

FAULT/TXE =

CS/LWAKE =

1OR

Voltage Rising Edge on LBUS

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.

FAULT/TXE = 1 represents input and no fault conditions. FAULT/TXE = 0 represents input low or a fault

condition. Refer to Table 1-3.

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